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问题:
I need to change the color of the disclosureIndicatorView accessory in a UITableViewCell. I think there are two ways to get this done, but I'm not able to figure out which one's the optimum. So here is what I think I can do.
There is a property of UITableViewCell - accessoryView. So I can use setAccessoryView:(UIView *)view and pass view as the UIImageView holding the image that I want.
I have written an utility class which creates the content view (stuff like background color, adding other stuff, etc) for my cell and I add this content view to the cell in UITableViewDelegate. The other option is to draw a UIImage overriding the drawRect method of CustomContentView utility class.
Performing option 1 - I can get the things done the apple way. Just give them the view and they do the rest. But I guess adding a new UIView object to every row might turn out to be a heavy object allocation and decreasing the frame rate. As compared to just a UIImage object in my contentView. I believe UIImage is lighter than UIView.
Please throw some light people and help me decide over it.
回答1:
But I guess adding a new UIView object to every row might turn out to be a heavy obj allocation and decreasing the frame rate. As compared to just a UIImage object in my contentView. I believe UIImage is lighter than UIView.
Drawing an image directly will almost certainly have better performance than adding a subview. You have to determine if that extra performance is necessary. I've used a few accessory views for custom disclosure indicators on basic cells and performance was fine. However, if you're already doing custom drawing for the content rect, it might not be that difficult to do the accessory view also.
回答2:
Great post on Cocoanetics that addresses this. The UIControl class inherits the properties selected, enabled and highlighted Custom-Colored Disclosure Indicators
回答3:
If you're interested in drawing the indicator, instead of using an image file, here's code I worked out to do so:
// (x,y) is the tip of the arrow CGFloat x = CGRectGetMaxX(self.bounds) - RIGHT_MARGIN; CGFloat y = CGRectGetMidY(self.bounds); const CGFloat R = 4.5; CGContextRef ctxt = UIGraphicsGetCurrentContext(); CGContextMoveToPoint(ctxt, x-R, y-R); CGContextAddLineToPoint(ctxt, x, y); CGContextAddLineToPoint(ctxt, x-R, y+R); CGContextSetLineCap(ctxt, kCGLineCapSquare); CGContextSetLineJoin(ctxt, kCGLineJoinMiter); CGContextSetLineWidth(ctxt, 3); // If the cell is highlighted (blue background) draw in white; otherwise gray if (CONTROL_IS_HIGHLIGHTED) { CGContextSetRGBStrokeColor(ctxt, 1, 1, 1, 1); } else { CGContextSetRGBStrokeColor(ctxt, 0.5, 0.5, 0.5, 1); } CGContextStrokePath(ctxt);
If you make a custom UIView subclass, do the above in the drawRect: method, and use that as your accessory view, you'll be able to make the color anything you want.
An accessory view (custom or UIImageView won't be a major performance problem as long as you are properly recycling UITableViewCell instances.
回答4:
Here is an implementation that works in iOS 8+. It does exactly what's asked for:
change the color of the original Apple disclosure indicator to a custom color.
Use it like this:
#import "UITableViewCell+DisclosureIndicatorColor.h" // cell is a UITableViewCell cell.disclosureIndicatorColor = [UIColor redColor]; // custom color [cell updateDisclosureIndicatorColorToTintColor]; // or use global tint color
UITableViewCell+DisclosureIndicatorColor.h
@interface UITableViewCell (DisclosureIndicatorColor) @property (nonatomic, strong) UIColor *disclosureIndicatorColor; - (void)updateDisclosureIndicatorColorToTintColor; @end
UITableViewCell+DisclosureIndicatorColor.m
@implementation UITableViewCell (DisclosureIndicatorColor) - (void)updateDisclosureIndicatorColorToTintColor { [self setDisclosureIndicatorColor:self.window.tintColor]; } - (void)setDisclosureIndicatorColor:(UIColor *)color { NSAssert(self.accessoryType == UITableViewCellAccessoryDisclosureIndicator, @"accessory type needs to be UITableViewCellAccessoryDisclosureIndicator"); UIButton *arrowButton = [self arrowButton]; UIImage *image = [arrowButton backgroundImageForState:UIControlStateNormal]; image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; arrowButton.tintColor = color; [arrowButton setBackgroundImage:image forState:UIControlStateNormal]; } - (UIColor *)disclosureIndicatorColor { NSAssert(self.accessoryType == UITableViewCellAccessoryDisclosureIndicator, @"accessory type needs to be UITableViewCellAccessoryDisclosureIndicator"); UIButton *arrowButton = [self arrowButton]; return arrowButton.tintColor; } - (UIButton *)arrowButton { for (UIView *view in self.subviews) if ([view isKindOfClass:[UIButton class]]) return (UIButton *)view; return nil; } @end
回答5:
See a Library. very easily change the colors of all kinds accessoryType.
MSCellAccessoryView
回答6:
Use an UIImageView. This will also allow you to change the image when the cell is selected:
UIImageView* arrowView = [[UIImageView alloc] initWithImage:normalImage]; arrowView.highlightedImage = selectedImage; cell.accessoryView = arrowView; [arrowView release];
回答7:
In swift 3, I have adapted the solution from @galambalazs as a class extention as follows:
import UIKit extension UITableViewCell { func setDisclosure(toColour: UIColor) -> () { for view in self.subviews { if let disclosure = view as? UIButton { if let image = disclosure.backgroundImage(for: .normal) { let colouredImage = image.withRenderingMode(.alwaysTemplate); disclosure.setImage(colouredImage, for: .normal) disclosure.tintColor = toColour } } } } }
Hope this helps some.
回答8:
benzado's solution works fine, but it showed a black background. In the UIView class that you setup (the one who's drawRect function you put in his code) needs to have the following initWithFrame implementation in order for the disclosure drawing to have a transparent background:
- (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self setBackgroundColor:[UIColor clearColor]]; // Initialization code. } return self; }
Naturally, you can set this to whatever color you want...
回答9:
While galambalazs' answer works, it should be noted that it is somewhat of a hack as it indirectly accesses and updates Apple's private implementation of the disclosure indicator. At best, it could stop working in future iOS releases, and at worst lead to App Store rejection. Setting the accessoryView is still the approved method until Apple exposes a property for directly setting the color.
Regardless, here is the Swift implementation of his answer for those who may want it:
Note: cell.disclosureIndicatorColor has to be set after cell.accessoryType = .DisclosureIndicator is set so that the disclosureIndicator button is available in the cell's subviews:
extension UITableViewCell { public var disclosureIndicatorColor: UIColor? { get { return arrowButton?.tintColor } set { var image = arrowButton?.backgroundImageForState(.Normal) image = image?.imageWithRenderingMode(.AlwaysTemplate) arrowButton?.tintColor = newValue arrowButton?.setBackgroundImage(image, forState: .Normal) } } public func updateDisclosureIndicatorColorToTintColor() { self.disclosureIndicatorColor = self.window?.tintColor } private var arrowButton: UIButton? { var buttonView: UIButton? self.subviews.forEach { (view) in if view is UIButton { buttonView = view as? UIButton return } } return buttonView } }
回答10:
As a contribution to the solution of @benzado I swiftified his code as followed:
override func drawRect(rect: CGRect) { super.drawRect(rect) let context = UIGraphicsGetCurrentContext(); let right_margin : CGFloat = 15.0 let length : CGFloat = 4.5; // (x,y) is the tip of the arrow let x = CGRectGetMaxX(self.bounds) - right_margin; let y = CGRectGetMidY(self.bounds); CGContextMoveToPoint(context, x - length, y - length); CGContextAddLineToPoint(context, x, y); CGContextAddLineToPoint(context, x - length, y + length); CGContextSetLineCap(context, .Round); CGContextSetLineJoin(context, .Miter); CGContextSetLineWidth(context, 2.5); if (self.highlighted) { CGContextSetStrokeColorWithColor(context, UIColor.appColorSelected().CGColor); } else { CGContextSetStrokeColorWithColor(context, UIColor.appColor().CGColor); } CGContextStrokePath(context); }
With a change of the app color a call to setNeedsDisplay() on the UITableCellView will update the color. I like to avoid the use of UIImage objects in cell views.
回答11:
A swift 3 version of the CocoaNetics solution
public class DisclosureIndicator: UIControl { public static func create(color: UIColor?, highlightedColor: UIColor?) -> DisclosureIndicator{ let indicator = DisclosureIndicator(frame: CGRect(x: 0, y: 0, width: 11, height: 15)) if let color = color { indicator.color = color } if let color = highlightedColor { indicator.highlightedColor = color } return indicator } public var color: UIColor = .black public var highlightedColor: UIColor = .white override public init(frame: CGRect) { super.init(frame: frame) backgroundColor = .clear } required public init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) backgroundColor = .clear } override public func draw(_ rect: CGRect) { super.draw(rect) let context = UIGraphicsGetCurrentContext()!; // (x,y) is the tip of the arrow let x = self.bounds.maxX - 3.0; let y = self.bounds.midY; let length : CGFloat = 4.5; context.move(to: CGPoint(x: x - length, y: y - length)) context.addLine(to: CGPoint(x: x, y: y)) context.addLine(to: CGPoint(x: x - length, y: y + length)) context.setLineCap(.round) context.setLineJoin(.miter) context.setLineWidth(3) context.setStrokeColor((isHighlighted ? highlightedColor : color).cgColor) context.strokePath() } override public var isHighlighted: Bool { get { return super.isHighlighted } set { super.isHighlighted = newValue setNeedsDisplay() } } }
