更改UITextField占位符颜色

如何动态更改占位符的颜色UITextField？这始终是相同的系统颜色。

xib编辑器中没有选项。

从文档

@property（非原子的，副本）NSAttributedString * attributedPlaceholder

默认情况下，此属性为nil。如果设置，则占位符字符串将使用70％的灰色和属性字符串的其余样式信息（文本颜色除外）绘制。为该属性分配新值还将用相同的字符串数据替换占位符属性的值，尽管没有任何格式信息。为该属性分配新值不会影响文本字段的任何其他与样式相关的属性。

物镜

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

迅速

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

斯威夫特4

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

_placeholderLabel.textColor

迅速

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

物镜

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

PS从Stackoverflow复制了3个不同的答案。

使用以下代码

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

首先添加此扩展

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
        }
    }
}

然后，您可以通过情节提要或仅像这样设置占位符文本颜色：

textfield.placeHolderTextColor = UIColor.red

我在SWIFT中使用它：

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

看来这对其他人有用...我不知道为什么以前对我没用...也许某些项目设置。感谢您的评论。目前，我无法再次进行测试。

已淘汰： 但是我不知道为什么，文本正确应用，但占位符颜色保持不变（黑色/灰色）。

--iOS8

尝试这个：

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;

您可以使用以下代码

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

此解决方案无需任何子类，也没有任何私有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
        }
    }
}

尝试这个。

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

@DogCoffee在Swift中的答案是

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

textField.attributedPlaceholder = placeholder

这是上面@Medin Piranej提供的扩展的改进版本（顺便说一句好主意！）。如果您尝试获取placeHolderTextColor，则此版本避免了无休止的循环；如果颜色集为nil，则避免崩溃。

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 ?? "")
        }
    }
}

}

对于Swift 3，我们可以使用此代码更改UITextfield的占位符文本颜色

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

斯威夫特4

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