Change of UITextField placeholder color

问题

How to dynamically change placeholder color of the UITextField? This is always the same system color.

No option in xib editor.

回答1:

From Docs

@property(nonatomic, copy) NSAttributedString *attributedPlaceholder

This property is nil by default. If set, the placeholder string is drawn using a 70% grey color and the remaining style information (except the text color) of the attributed string. Assigning a new value to this property also replaces the value of the placeholder property with the same string data, albeit without any formatting information. Assigning a new value to this property does not affect any other style-related properties of the text field.

Objective-C

NSAttributedString *str = [[NSAttributedString alloc] initWithString:@"Some Text" attributes:@{ NSForegroundColorAttributeName : [UIColor redColor] }];
self.myTextField.attributedPlaceholder = str;

Swift

let str = NSAttributedString(string: "Text", attributes: [NSForegroundColorAttributeName:UIColor.redColor()])
myTextField.attributedPlaceholder = str

Swift 4

let str = NSAttributedString(string: "Text", attributes: [NSAttributedString.Key.foregroundColor: UIColor.red])
myTextField.attributedPlaceholder = str

回答2:

_placeholderLabel.textColor

In swift

myTextField.attributedPlaceholder = 
NSAttributedString(string: "placeholder", attributes:[NSForegroundColorAttributeName : UIColor.redColor()])

Objective-C

UIColor *color = [UIColor grayColor];
nameText.attributedPlaceholder =
   [[NSAttributedString alloc]
   initWithString:@"Full Name"
   attributes:@{NSForegroundColorAttributeName:color}];

P.S Copied 3 different answers from Stackoverflow.

回答3:

Use below code

[YourtextField setValue:[UIColor colorWithRed:97.0/255.0 green:1.0/255.0 blue:17.0/255.0 alpha:1.0] forKeyPath:@"_placeholderLabel.textColor"];

回答4:

First add this extension

extension UITextField{
    @IBInspectable var placeHolderTextColor: UIColor? {
        set {
            let placeholderText = self.placeholder != nil ? self.placeholder! : ""
            attributedPlaceholder = NSAttributedString(string:placeholderText, attributes:[NSForegroundColorAttributeName: newValue!])
        }
        get{
            return self.placeHolderTextColor
        }
    }
}

Then you can change placeholder text color via storyboard or by just setting it like this :

textfield.placeHolderTextColor = UIColor.red

回答5:

I use this in SWIFT:

myTextField.attributedPlaceholder = NSAttributedString(string: "placeholder", attributes: [NSForegroundColorAttributeName : UIColor.redColor()])

It seems that this works for others... I have no idea why it haven't worked for me before... maybe some project settings. Thanks for the comments. Currently I have no way how to test it again.

Obsolete: But I don't know why, text is applied correctly, but placeholder color remains same (black/gray).

--iOS8

回答6:

Try this:

NSAttributedString *strUser = [[NSAttributedString alloc] initWithString:@"Username" attributes:@{ NSForegroundColorAttributeName : [UIColor whiteColor] }];
NSAttributedString *strPassword = [[NSAttributedString alloc] initWithString:@"Password" attributes:@{ NSForegroundColorAttributeName : [UIColor whiteColor] }];

self.username.attributedPlaceholder = strUser;
self.password.attributedPlaceholder = strPassword;

回答7:

You can use the following code

[txtUsername setValue:[UIColor darkGrayColor] forKeyPath:@"_placeholderLabel.textColor"];

回答8:

This solution works without any subclassing and without any private ivars:

@IBOutlet weak var emailTextField: UITextField! {
    didSet {
        if emailTextField != nil {
            let placeholderText = NSLocalizedString("Tap here to enter", comment: "Tap here to enter")
            let placeholderString = NSAttributedString(string: placeholderText, attributes: [NSForegroundColorAttributeName: UIColor(white: 0.66, alpha: 1.0)])
            emailTextField.attributedPlaceholder = placeholderString
        }
    }
}

回答9:

Try This.

UIColor *color = [UIColor redColor];
self.txtUsername.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Your Placeholder Text" attributes:@{NSForegroundColorAttributeName:color}];

回答10:

@DogCoffee's answer in Swift would be

let placeholderAttrs = [ NSForegroundColorAttributeName : UIColor.redColor()]
let placeholder = NSAttributedString(string: "Some text", attributes: placeholderAttrs)

textField.attributedPlaceholder = placeholder

回答11:

This is an improved version of the extension provided by @Medin Piranej above (good idea by the way!). This version avoids an endless cycle if you try to get the placeHolderTextColor and prevents crashes if the color set is nil.

public extension UITextField {

@IBInspectable public var placeholderColor: UIColor? {
    get {
        if let attributedPlaceholder = attributedPlaceholder, attributedPlaceholder.length > 0 {
            var attributes = attributedPlaceholder.attributes(at: 0,
                                                              longestEffectiveRange: nil,
                                                              in: NSRange(location: 0, length: attributedPlaceholder.length))
            return attributes[NSForegroundColorAttributeName] as? UIColor
        }
        return nil
    }
    set {
        if let placeholderColor = newValue {
            attributedPlaceholder = NSAttributedString(string: placeholder ?? "",
                                                       attributes:[NSForegroundColorAttributeName: placeholderColor])
        } else {
            // The placeholder string is drawn using a system-defined color.
            attributedPlaceholder = NSAttributedString(string: placeholder ?? "")
        }
    }
}

}

回答12:

for swift 3 ,we can use this code for change the placeholder text color for UITextfield

 let placeholderColor = UIColor.red
 mytextField.attributedPlaceholder = NSAttributedString(string: mytextField.placeholder, attributes: [NSForegroundColorAttributeName : placeholderColor])

回答13:

Swift 4

let placeholderColor = UIColor.red
self.passwordTextField?.attributedPlaceholder = 
NSAttributedString(string:"placeholderText", attributes: 
[NSAttributedStringKey.foregroundColor : placeholderColor])

来源：https://stackoverflow.com/questions/21074417/change-of-uitextfield-placeholder-color