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Aligning text and image on UIButton with imageEdgeInsets and titleEdgeInsets

由 主宰稳场 提交于 2019-12-17 02:28:08

问题


I would like to place an icon left of the two lines of text such that there's about 2-3 pixels of space between the image and the start of text. The control itself is Center aligned horizontally (set through Interface Builder)

The button would resemble something like this:

|                  |
|[Image] Add To    |
|        Favorites |

I'm trying to configure this with contentEdgeInset, imageEdgeInsets and titleEdgeInsets to no avail. I understand that a negative value expands the edge while a positive value shrinks it to move it closer to the center.

I tried:

[button setTitleEdgeInsets:UIEdgeInsetsMake(0, -image.size.width, 0, 0)];
[button setImageEdgeInsets:UIEdgeInsetsMake(0, button.titleLabel.bounds.size.width, 0, 0)];

but this doesn't display it correctly. I've been tweaking the values but going from say -5 to -10 on the left inset value doesn't appear to move it in expected manner. -10 will scoot the text all the way to the left so I expected -5 to scoot it half way from the left side but it doesn't.

What's the logic behind insets? I'm not familiar with image placements and related terminology.

I used this SO question as a reference but something about my values isn't right. UIButton: how to center an image and a text using imageEdgeInsets and titleEdgeInsets?


回答1:


I agree the documentation on imageEdgeInsets and titleEdgeInsets should be better, but I figured out how to get the correct positioning without resorting to trial and error.

The general idea is here at this question, but that was if you wanted both text and image centered. We don't want the image and text to be centered individually, we want the image and the text to be centered together as a single entity. This is in fact what UIButton already does so we simply need to adjust the spacing.

CGFloat spacing = 10; // the amount of spacing to appear between image and title
tabBtn.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, spacing);
tabBtn.titleEdgeInsets = UIEdgeInsetsMake(0, spacing, 0, 0);

I also turned this into a category for UIButton so it will be easy to use:

UIButton+Position.h

@interface UIButton(ImageTitleCentering)

-(void) centerButtonAndImageWithSpacing:(CGFloat)spacing;

@end

UIButton+Position.m

@implementation UIButton(ImageTitleCentering)

-(void) centerButtonAndImageWithSpacing:(CGFloat)spacing {
    self.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, spacing);
    self.titleEdgeInsets = UIEdgeInsetsMake(0, spacing, 0, 0);
}

@end

So now all I have to do is:

[button centerButtonAndImageWithSpacing:10];

And I get what I need every time. No more messing with the edge insets manually.

EDIT: Swapping Image and Text

In response to @Javal in comments

Using this same mechanism, we can swap the image and the text. To accomplish the swap, simply use a negative spacing but also include the width of the text and the image. This will require frames to be known and layout performed already.

[self.view layoutIfNeeded];
CGFloat flippedSpacing = -(desiredSpacing + button.currentImage.size.width + button.titleLabel.frame.size.width);
[button centerButtonAndImageWithSpacing:flippedSpacing];

Of course you will probably want to make a nice method for this, potentially adding a second category method, this is left as an exercise to the reader.




回答2:


I'm a little late to this party, but I think I have something useful to add.

Kekoa's answer is great but, as RonLugge mentions, it can make the button no longer respect sizeToFit or, more importantly, can cause the button to clip its content when it is intrinsically sized. Yikes!

First, though,

A brief explanation of how I believe imageEdgeInsets and titleEdgeInsets work:

The docs for imageEdgeInsets have the following to say, in part:

Use this property to resize and reposition the effective drawing rectangle for the button image. You can specify a different value for each of the four insets (top, left, bottom, right). A positive value shrinks, or insets, that edge—moving it closer to the center of the button. A negative value expands, or outsets, that edge.

I believe that this documentation was written imagining that the button has no title, just an image. It makes a lot more sense thought of this way, and behaves how UIEdgeInsets usually do. Basically, the frame of the image (or the title, with titleEdgeInsets) is moved inwards for positive insets and outwards for negative insets.

OK, so what?

I'm getting there! Here's what you have by default, setting an image and a title (the button border is green just to show where it is):

When you want spacing between an image and a title, without causing either to be crushed, you need to set four different insets, two on each of the image and title. That's because you don't want to change the sizes of those elements' frames, but just their positions. When you start thinking this way, the needed change to Kekoa's excellent category becomes clear:

@implementation UIButton(ImageTitleCentering)

- (void)centerButtonAndImageWithSpacing:(CGFloat)spacing {
    CGFloat insetAmount = spacing / 2.0;
    self.imageEdgeInsets = UIEdgeInsetsMake(0, -insetAmount, 0, insetAmount);
    self.titleEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, -insetAmount);
}

@end

But wait, you say, when I do that, I get this:

Oh yeah! I forgot, the docs warned me about this. They say, in part:

This property is used only for positioning the image during layout. The button does not use this property to determine intrinsicContentSize and sizeThatFits:.

But there is a property that can help, and that's contentEdgeInsets. The docs for that say, in part:

The button uses this property to determine intrinsicContentSize and sizeThatFits:.

That sounds good. So let's tweak the category once more:

@implementation UIButton(ImageTitleCentering)

- (void)centerButtonAndImageWithSpacing:(CGFloat)spacing {
    CGFloat insetAmount = spacing / 2.0;
    self.imageEdgeInsets = UIEdgeInsetsMake(0, -insetAmount, 0, insetAmount);
    self.titleEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, -insetAmount);
    self.contentEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, insetAmount);
}

@end

And what do you get?

Looks like a winner to me.

Working in Swift and don't want to do any thinking at all? Here's the final version of the extension in Swift:

extension UIButton {
    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount, bottom: 0, right: insetAmount)
        titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: -insetAmount)
        contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
    }
}



回答3:


In interface Builder. Select the UIButton -> Attributes Inspector -> Edge=Title and modify the edge insets




回答4:


Also if you want to make something similar to

You need

1.Set horizontal and vertical alignment for button to

  1. Find all required values and set UIImageEdgeInsets

            CGSize buttonSize = button.frame.size;
        NSString *buttonTitle = button.titleLabel.text;
        CGSize titleSize = [buttonTitle sizeWithAttributes:@{ NSFontAttributeName : [UIFont camFontZonaProBoldWithSize:12.f] }];
        UIImage *buttonImage = button.imageView.image;
        CGSize buttonImageSize = buttonImage.size;

        CGFloat offsetBetweenImageAndText = 10; //vertical space between image and text

        [button setImageEdgeInsets:UIEdgeInsetsMake((buttonSize.height - (titleSize.height + buttonImageSize.height)) / 2 - offsetBetweenImageAndText,
                                                    (buttonSize.width - buttonImageSize.width) / 2,
                                                    0,0)];                
        [button setTitleEdgeInsets:UIEdgeInsetsMake((buttonSize.height - (titleSize.height + buttonImageSize.height)) / 2 + buttonImageSize.height + offsetBetweenImageAndText,
                                                    titleSize.width + [button imageEdgeInsets].left > buttonSize.width ? -buttonImage.size.width  +  (buttonSize.width - titleSize.width) / 2 : (buttonSize.width - titleSize.width) / 2 - buttonImage.size.width,
                                                    0,0)];

This will arrange your title and image on button.

Also please note update this on each relayout

Swift

import UIKit

extension UIButton {
    // MARK: - UIButton+Aligment

    func alignContentVerticallyByCenter(offset:CGFloat = 10) {
        let buttonSize = frame.size

        if let titleLabel = titleLabel,
            let imageView = imageView {

            if let buttonTitle = titleLabel.text,
                let image = imageView.image {
                let titleString:NSString = NSString(string: buttonTitle)
                let titleSize = titleString.sizeWithAttributes([
                    NSFontAttributeName : titleLabel.font
                    ])
                let buttonImageSize = image.size

                let topImageOffset = (buttonSize.height - (titleSize.height + buttonImageSize.height + offset)) / 2
                let leftImageOffset = (buttonSize.width - buttonImageSize.width) / 2
                imageEdgeInsets = UIEdgeInsetsMake(topImageOffset,
                                                   leftImageOffset,
                                                   0,0)

                let titleTopOffset = topImageOffset + offset + buttonImageSize.height
                let leftTitleOffset = (buttonSize.width - titleSize.width) / 2 - image.size.width

                titleEdgeInsets = UIEdgeInsetsMake(titleTopOffset,
                                                   leftTitleOffset,
                                                   0,0)
            }
        }
    }
}



回答5:


You can avoid much trouble by using this --

myButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;   
myButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

This will align all your content automatically to left (or wherever you want it)

Swift 3:

myButton.contentHorizontalAlignment = UIControlContentHorizontalAlignment.left;   
myButton.contentVerticalAlignment = UIControlContentVerticalAlignment.center;



回答6:


In Xcode 8.0 you can simply do it by changing insets in size inspector.

Select the UIButton -> Attributes Inspector -> go to size inspector and modify the content, image and title insets.

And if you want to change image on right side you can simply change the semantic property to Force Right-to-left in Attribute inspector .




回答7:


I'm a little late to this party too, but I think I have something useful to add :o).

I created a UIButton subclass whose purpose is to be able to choose where the button's image is layout, either vertically or horizontally.

It means that you can make this kind of buttons :

Here the details about how to create these buttons with my class :

func makeButton (imageVerticalAlignment:LayoutableButton.VerticalAlignment, imageHorizontalAlignment:LayoutableButton.HorizontalAlignment, title:String) -> LayoutableButton {
    let button = LayoutableButton ()

    button.imageVerticalAlignment = imageVerticalAlignment
    button.imageHorizontalAlignment = imageHorizontalAlignment

    button.setTitle(title, for: .normal)

    // add image, border, ...

    return button
}

let button1 = makeButton(imageVerticalAlignment: .center, imageHorizontalAlignment: .left, title: "button1")
let button2 = makeButton(imageVerticalAlignment: .center, imageHorizontalAlignment: .right, title: "button2")
let button3 = makeButton(imageVerticalAlignment: .top, imageHorizontalAlignment: .center, title: "button3")
let button4 = makeButton(imageVerticalAlignment: .bottom, imageHorizontalAlignment: .center, title: "button4")
let button5 = makeButton(imageVerticalAlignment: .bottom, imageHorizontalAlignment: .center, title: "button5")
button5.contentEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

To do that, I added 2 attributes : imageVerticalAlignment and imageHorizontalAlignment. Off course, If your button only have an image or a title ... don't use this class at all !

I also added an attribute named imageToTitleSpacing which allow you to adjust space between title and image.

This class try his best to be compatible if you want to use imageEdgeInsets, titleEdgeInsets and contentEdgeInsets directly or in combinaison with the new layout attributes.

As @ravron explains us, I try my best to make the button content edge correct (as you can see with the red borders).

You can also use it in Interface Builder :

  1. Create a UIButton
  2. Change the button class
  3. Adjust Layoutable Attributes using "center", "top", "bottom", "left" or "right"

Here the code (gist) :

@IBDesignable
class LayoutableButton: UIButton {

    enum VerticalAlignment : String {
        case center, top, bottom, unset
    }


    enum HorizontalAlignment : String {
        case center, left, right, unset
    }


    @IBInspectable
    var imageToTitleSpacing: CGFloat = 8.0 {
        didSet {
            setNeedsLayout()
        }
    }


    var imageVerticalAlignment: VerticalAlignment = .unset {
        didSet {
            setNeedsLayout()
        }
    }

    var imageHorizontalAlignment: HorizontalAlignment = .unset {
        didSet {
            setNeedsLayout()
        }
    }

    @available(*, unavailable, message: "This property is reserved for Interface Builder. Use 'imageVerticalAlignment' instead.")
    @IBInspectable
    var imageVerticalAlignmentName: String {
        get {
            return imageVerticalAlignment.rawValue
        }
        set {
            if let value = VerticalAlignment(rawValue: newValue) {
                imageVerticalAlignment = value
            } else {
                imageVerticalAlignment = .unset
            }
        }
    }

    @available(*, unavailable, message: "This property is reserved for Interface Builder. Use 'imageHorizontalAlignment' instead.")
    @IBInspectable
    var imageHorizontalAlignmentName: String {
        get {
            return imageHorizontalAlignment.rawValue
        }
        set {
            if let value = HorizontalAlignment(rawValue: newValue) {
                imageHorizontalAlignment = value
            } else {
                imageHorizontalAlignment = .unset
            }
        }
    }

    var extraContentEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var contentEdgeInsets: UIEdgeInsets {
        get {
            return super.contentEdgeInsets
        }
        set {
            super.contentEdgeInsets = newValue
            self.extraContentEdgeInsets = newValue
        }
    }

    var extraImageEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var imageEdgeInsets: UIEdgeInsets {
        get {
            return super.imageEdgeInsets
        }
        set {
            super.imageEdgeInsets = newValue
            self.extraImageEdgeInsets = newValue
        }
    }

    var extraTitleEdgeInsets:UIEdgeInsets = UIEdgeInsets.zero

    override var titleEdgeInsets: UIEdgeInsets {
        get {
            return super.titleEdgeInsets
        }
        set {
            super.titleEdgeInsets = newValue
            self.extraTitleEdgeInsets = newValue
        }
    }

    //Needed to avoid IB crash during autolayout
    override init(frame: CGRect) {
        super.init(frame: frame)
    }


    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        self.imageEdgeInsets = super.imageEdgeInsets
        self.titleEdgeInsets = super.titleEdgeInsets
        self.contentEdgeInsets = super.contentEdgeInsets
    }

    override func layoutSubviews() {
        if let imageSize = self.imageView?.image?.size,
            let font = self.titleLabel?.font,
            let textSize = self.titleLabel?.attributedText?.size() ?? self.titleLabel?.text?.size(attributes: [NSFontAttributeName: font]) {

            var _imageEdgeInsets = UIEdgeInsets.zero
            var _titleEdgeInsets = UIEdgeInsets.zero
            var _contentEdgeInsets = UIEdgeInsets.zero

            let halfImageToTitleSpacing = imageToTitleSpacing / 2.0

            switch imageVerticalAlignment {
            case .bottom:
                _imageEdgeInsets.top = (textSize.height + imageToTitleSpacing) / 2.0
                _imageEdgeInsets.bottom = (-textSize.height - imageToTitleSpacing) / 2.0
                _titleEdgeInsets.top = (-imageSize.height - imageToTitleSpacing) / 2.0
                _titleEdgeInsets.bottom = (imageSize.height + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.top = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.bottom = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
            case .top:
                _imageEdgeInsets.top = (-textSize.height - imageToTitleSpacing) / 2.0
                _imageEdgeInsets.bottom = (textSize.height + imageToTitleSpacing) / 2.0
                _titleEdgeInsets.top = (imageSize.height + imageToTitleSpacing) / 2.0
                _titleEdgeInsets.bottom = (-imageSize.height - imageToTitleSpacing) / 2.0
                _contentEdgeInsets.top = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                _contentEdgeInsets.bottom = (min (imageSize.height, textSize.height) + imageToTitleSpacing) / 2.0
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
            case .center:
                //only works with contentVerticalAlignment = .center
                contentVerticalAlignment = .center
                break
            case .unset:
                break
            }

            switch imageHorizontalAlignment {
            case .left:
                _imageEdgeInsets.left = -halfImageToTitleSpacing
                _imageEdgeInsets.right = halfImageToTitleSpacing
                _titleEdgeInsets.left = halfImageToTitleSpacing
                _titleEdgeInsets.right = -halfImageToTitleSpacing
                _contentEdgeInsets.left = halfImageToTitleSpacing
                _contentEdgeInsets.right = halfImageToTitleSpacing
            case .right:
                _imageEdgeInsets.left = textSize.width + halfImageToTitleSpacing
                _imageEdgeInsets.right = -textSize.width - halfImageToTitleSpacing
                _titleEdgeInsets.left = -imageSize.width - halfImageToTitleSpacing
                _titleEdgeInsets.right = imageSize.width + halfImageToTitleSpacing
                _contentEdgeInsets.left = halfImageToTitleSpacing
                _contentEdgeInsets.right = halfImageToTitleSpacing
            case .center:
                _imageEdgeInsets.left = textSize.width / 2.0
                _imageEdgeInsets.right = -textSize.width / 2.0
                _titleEdgeInsets.left = -imageSize.width / 2.0
                _titleEdgeInsets.right = imageSize.width / 2.0
                _contentEdgeInsets.left = -((imageSize.width + textSize.width) - max (imageSize.width, textSize.width)) / 2.0
                _contentEdgeInsets.right = -((imageSize.width + textSize.width) - max (imageSize.width, textSize.width)) / 2.0
            case .unset:
                break
            }

            _contentEdgeInsets.top += extraContentEdgeInsets.top
            _contentEdgeInsets.bottom += extraContentEdgeInsets.bottom
            _contentEdgeInsets.left += extraContentEdgeInsets.left
            _contentEdgeInsets.right += extraContentEdgeInsets.right

            _imageEdgeInsets.top += extraImageEdgeInsets.top
            _imageEdgeInsets.bottom += extraImageEdgeInsets.bottom
            _imageEdgeInsets.left += extraImageEdgeInsets.left
            _imageEdgeInsets.right += extraImageEdgeInsets.right

            _titleEdgeInsets.top += extraTitleEdgeInsets.top
            _titleEdgeInsets.bottom += extraTitleEdgeInsets.bottom
            _titleEdgeInsets.left += extraTitleEdgeInsets.left
            _titleEdgeInsets.right += extraTitleEdgeInsets.right

            super.imageEdgeInsets = _imageEdgeInsets
            super.titleEdgeInsets = _titleEdgeInsets
            super.contentEdgeInsets = _contentEdgeInsets

        } else {
            super.imageEdgeInsets = extraImageEdgeInsets
            super.titleEdgeInsets = extraTitleEdgeInsets
            super.contentEdgeInsets = extraContentEdgeInsets
        }

        super.layoutSubviews()
    }
}



回答8:


A small addition to Riley Avron answer to account locale changes:

extension UIButton {
    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        let writingDirection = UIApplication.sharedApplication().userInterfaceLayoutDirection
        let factor: CGFloat = writingDirection == .LeftToRight ? 1 : -1

        self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount*factor, bottom: 0, right: insetAmount*factor)
        self.titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount*factor, bottom: 0, right: -insetAmount*factor)
        self.contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
    }
}



回答9:


Swift 4.x

extension UIButton {
    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        let writingDirection = UIApplication.shared.userInterfaceLayoutDirection
        let factor: CGFloat = writingDirection == .leftToRight ? 1 : -1

        self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount*factor, bottom: 0, right: insetAmount*factor)
        self.titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount*factor, bottom: 0, right: -insetAmount*factor)
        self.contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
    }
}

Usage:

button.centerTextAndImage(spacing: 10.0)



回答10:


I write code bewlow. It works well in product version. Supprot Swift 4.2 +

extension UIButton{
 enum ImageTitleRelativeLocation {
    case imageUpTitleDown
    case imageDownTitleUp
    case imageLeftTitleRight
    case imageRightTitleLeft
}
 func centerContentRelativeLocation(_ relativeLocation: 
                                      ImageTitleRelativeLocation,
                                   spacing: CGFloat = 0) {
    assert(contentVerticalAlignment == .center,
           "only works with contentVerticalAlignment = .center !!!")

    guard (title(for: .normal) != nil) || (attributedTitle(for: .normal) != nil) else {
        assert(false, "TITLE IS NIL! SET TITTLE FIRST!")
        return
    }

    guard let imageSize = self.currentImage?.size else {
        assert(false, "IMGAGE IS NIL! SET IMAGE FIRST!!!")
        return
    }
    guard let titleSize = titleLabel?
        .systemLayoutSizeFitting(UIView.layoutFittingCompressedSize) else {
            assert(false, "TITLELABEL IS NIL!")
            return
    }

    let horizontalResistent: CGFloat
    // extend contenArea in case of title is shrink
    if frame.width < titleSize.width + imageSize.width {
        horizontalResistent = titleSize.width + imageSize.width - frame.width
        print("horizontalResistent", horizontalResistent)
    } else {
        horizontalResistent = 0
    }

    var adjustImageEdgeInsets: UIEdgeInsets = .zero
    var adjustTitleEdgeInsets: UIEdgeInsets = .zero
    var adjustContentEdgeInsets: UIEdgeInsets = .zero

    let verticalImageAbsOffset = abs((titleSize.height + spacing) / 2)
    let verticalTitleAbsOffset = abs((imageSize.height + spacing) / 2)

    switch relativeLocation {
    case .imageUpTitleDown:

        adjustImageEdgeInsets.top = -verticalImageAbsOffset
        adjustImageEdgeInsets.bottom = verticalImageAbsOffset
        adjustImageEdgeInsets.left = titleSize.width / 2 + horizontalResistent / 2
        adjustImageEdgeInsets.right = -titleSize.width / 2 - horizontalResistent / 2

        adjustTitleEdgeInsets.top = verticalTitleAbsOffset
        adjustTitleEdgeInsets.bottom = -verticalTitleAbsOffset
        adjustTitleEdgeInsets.left = -imageSize.width / 2 + horizontalResistent / 2
        adjustTitleEdgeInsets.right = imageSize.width / 2 - horizontalResistent / 2

        adjustContentEdgeInsets.top = spacing
        adjustContentEdgeInsets.bottom = spacing
        adjustContentEdgeInsets.left = -horizontalResistent
        adjustContentEdgeInsets.right = -horizontalResistent
    case .imageDownTitleUp:
        adjustImageEdgeInsets.top = verticalImageAbsOffset
        adjustImageEdgeInsets.bottom = -verticalImageAbsOffset
        adjustImageEdgeInsets.left = titleSize.width / 2 + horizontalResistent / 2
        adjustImageEdgeInsets.right = -titleSize.width / 2 - horizontalResistent / 2

        adjustTitleEdgeInsets.top = -verticalTitleAbsOffset
        adjustTitleEdgeInsets.bottom = verticalTitleAbsOffset
        adjustTitleEdgeInsets.left = -imageSize.width / 2 + horizontalResistent / 2
        adjustTitleEdgeInsets.right = imageSize.width / 2 - horizontalResistent / 2

        adjustContentEdgeInsets.top = spacing
        adjustContentEdgeInsets.bottom = spacing
        adjustContentEdgeInsets.left = -horizontalResistent
        adjustContentEdgeInsets.right = -horizontalResistent
    case .imageLeftTitleRight:
        adjustImageEdgeInsets.left = -spacing / 2
        adjustImageEdgeInsets.right = spacing / 2

        adjustTitleEdgeInsets.left = spacing / 2
        adjustTitleEdgeInsets.right = -spacing / 2

        adjustContentEdgeInsets.left = spacing
        adjustContentEdgeInsets.right = spacing
    case .imageRightTitleLeft:
        adjustImageEdgeInsets.left = titleSize.width + spacing / 2
        adjustImageEdgeInsets.right = -titleSize.width - spacing / 2

        adjustTitleEdgeInsets.left = -imageSize.width - spacing / 2
        adjustTitleEdgeInsets.right = imageSize.width + spacing / 2

        adjustContentEdgeInsets.left = spacing
        adjustContentEdgeInsets.right = spacing
    }

    imageEdgeInsets = adjustImageEdgeInsets
    titleEdgeInsets = adjustTitleEdgeInsets
    contentEdgeInsets = adjustContentEdgeInsets

    setNeedsLayout()
}
}



回答11:


Here is a simple example of how to use imageEdgeInsets This will make a 30x30 button with a hittable area 10 pixels bigger all the way around (50x50) 

    var expandHittableAreaAmt : CGFloat = 10
    var buttonWidth : CGFloat = 30
    var button = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
    button.frame = CGRectMake(0, 0, buttonWidth+expandHittableAreaAmt, buttonWidth+expandHittableAreaAmt)
    button.imageEdgeInsets = UIEdgeInsetsMake(expandHittableAreaAmt, expandHittableAreaAmt, expandHittableAreaAmt, expandHittableAreaAmt)
    button.setImage(UIImage(named: "buttonImage"), forState: .Normal)
    button.addTarget(self, action: "didTouchButton:", forControlEvents:.TouchUpInside)



回答12:


An elegant way in Swift 3 and better to understand:

override func imageRect(forContentRect contentRect: CGRect) -> CGRect {
    let leftMargin:CGFloat = 40
    let imgWidth:CGFloat = 24
    let imgHeight:CGFloat = 24
    return CGRect(x: leftMargin, y: (contentRect.size.height-imgHeight) * 0.5, width: imgWidth, height: imgHeight)
}

override func titleRect(forContentRect contentRect: CGRect) -> CGRect {
    let leftMargin:CGFloat = 80
    let rightMargin:CGFloat = 80
    return CGRect(x: leftMargin, y: 0, width: contentRect.size.width-leftMargin-rightMargin, height: contentRect.size.height)
}
override func backgroundRect(forBounds bounds: CGRect) -> CGRect {
    let leftMargin:CGFloat = 10
    let rightMargin:CGFloat = 10
    let topMargin:CGFloat = 10
    let bottomMargin:CGFloat = 10
    return CGRect(x: leftMargin, y: topMargin, width: bounds.size.width-leftMargin-rightMargin, height: bounds.size.height-topMargin-bottomMargin)
}
override func contentRect(forBounds bounds: CGRect) -> CGRect {
    let leftMargin:CGFloat = 5
    let rightMargin:CGFloat = 5
    let topMargin:CGFloat = 5
    let bottomMargin:CGFloat = 5
    return CGRect(x: leftMargin, y: topMargin, width: bounds.size.width-leftMargin-rightMargin, height: bounds.size.height-topMargin-bottomMargin)
}



回答13:


The swift 4.2 version of solution would be the following:

let spacing: CGFloat = 10 // the amount of spacing to appear between image and title
self.button?.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: spacing)
self.button?.titleEdgeInsets = UIEdgeInsets(top: 0, left: spacing, bottom: 0, right: 0)


来源：https://stackoverflow.com/questions/4564621/aligning-text-and-image-on-uibutton-with-imageedgeinsets-and-titleedgeinsets

标签
iphone
ios
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