Question

如何动态更改UITextField的占位符颜色？这始终是相同的系统颜色。

xib编辑器中没有选项。

Answer 1

来自文档

@property（非原子，复制）NSAttributedString * attributedPlaceholder

默认情况下，此属性为零。如果设置，则占位符字符串为   使用70％灰色和剩余的样式信息绘制   （属性字符串除外）（文本颜色除外）。分配新的   此属性的值也替换占位符的值   具有相同字符串数据的属性，尽管没有任何格式   信息。为此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。

<强>目标C

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

<强>夫特

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

Answer 2

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"];

Answer 3

首先添加此扩展程序

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，您可以通过故事板更改占位符文本颜色，或者只需将其设置为：

textfield.placeHolderTextColor = UIColor.red

Answer 4

我在SWIFT中使用它：

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

这似乎适用于其他人...... 我不知道为什么它之前没有为我工作......也许是一些项目设置。感谢您的评论。目前我无法再次测试它。

过时： 但我不知道为什么，正确应用文字，但占位符颜色保持不变（黑/灰）。

- iOS8上

Answer 5

试试这个：

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;

Answer 6

您可以使用以下代码

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

Answer 7

此解决方案在没有任何子类化且没有任何私有ivars的情况下工作：

@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
        }
    }
}

Answer 8

试试这个。

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

Answer 9

@ DogCoffee在Swift中的回答是

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

textField.attributedPlaceholder = placeholder

Answer 10

这是@Medin Piranej上面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并且如果颜色集为零则防止崩溃，则此版本避免了无限循环。

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 ?? "")
        }
    }
}

}

Answer 11

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])

Answer 12

雨燕4

SIGPIPE

Answer 13

[yourtextFieldName setValue:[UIColor lightGrayColor] forKeyPath:@"_placeholderLabel.textColor"];

更改UITextField占位符颜色

13 个答案: