UITextField 在 iOS 中将占位符颜色设置为深色

Question

我已尝试将 UITextField "Placeholder" 颜色设置为深色。

NSAttributedString * search = [[NSAttributedString alloc] initWithString:@"Search" attributes:@{NSForegroundColorAttributeName: [UIColor blackColor]}];

textField.attributedPlaceholder = search;

• 但UITextField 在“占位符”中仍显示为浅灰色。

• 是否可以为UITextField 设置深色“占位符”颜色？

我也试过另一种方法

[textField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];

但这两种方法都适用于 iOS 7，但不适用于 iOS 6。

• 是否可以在 iOS 6 目标中为 UITextField 设置深色 "placeholder" 颜色？

谢谢！

Answer 1

覆盖drawPlaceholderInRect: 方法来绘制我们自己的占位符文本。

- (void)drawPlaceholderInRect:(CGRect)rect
{
    UIColor *colour = [UIColor darkColor];
    
    if ([self.placeholder respondsToSelector:@selector(drawInRect:withAttributes:)]) {
        // iOS7 and later
        NSDictionary *attributes = @{NSForegroundColorAttributeName: colour, NSFontAttributeName: self.font};
        CGRect boundingRect = [self.placeholder boundingRectWithSize:rect.size options:0 attributes:attributes context:nil];
        [self.placeholder drawAtPoint:CGPointMake(0, (rect.size.height/2)-boundingRect.size.height/2) withAttributes:attributes];
    }
    else {
        // iOS 6
        [colour setFill];
        [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:NSLineBreakByTruncatingTail alignment:self.textAlignment];
    }
}

或

这种情况，如果未来内部变量发生变化，可能会崩溃

以编程方式：

  [self.MyTextField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];

在UIStoryBoard:

或

编辑： 玩 UITextFiled 代表。这很棘手：

-(void)viewDidLoad{
  self.mytxtField.text = @"PlaceholderText";
  self.mytxtField.delegate = self;
   self.mytxtField.textColor = [UIColor darkGrayColor];

}

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
           if ([self.mytxtField.text isEqualToString: @"PlaceholderText"]) {
             self.mytxtField.text = @"";
             self.mytxtField.textColor = [UIColor blackColor]; 
        }
    }


-(void)textFieldDidEndEditing:(UITextField *)textField{
      if ([self.mytxtField.text length]<1) {
            self.mytxtField.text =@"PlaceholderText";
            self.mytxtField.textColor = [UIColor darkGrayColor]; 

        }  

Answer 2

很简单....

试试这个来改变占位符文本的颜色..

UIColor *color = [UIColor blackColor];
textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:placeholderText attributes:@{NSForegroundColorAttributeName: color}];

Answer 3

试试这个

 [textField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];

Answer 4

为了使其面向未来并完全可定制（颜色、字体、大小等），我只需在顶部添加一个 UILabel 并根据 UITextField 内容手动隐藏/显示它。

只需确保将标签的 userInteractionEnabled 设置为 NO。

Answer 5

它将改变textField的占位符文本颜色

[yourTextField setValue:[UIColor colorWithRed:150.0f/255.0f green:150.0f/255.0f blue:155.0f/255.0f alpha:1] forKeyPath:@"_placeholderLabel.textColor"];

Answer 6

按照 Apple 的建议，继承 UITextField 并覆盖 - (void)drawPlaceholderInRect:(CGRect)rect 是可行的方法：

- (void)drawPlaceholderInRect:(CGRect)rect { 
    UIColor *colour = [UIColor lightGrayColor]; 
    if ([self.placeholder respondsToSelector:@selector(drawInRect:withAttributes:)]) 
    { // iOS7 and later 
        NSDictionary *attributes = @{NSForegroundColorAttributeName: colour, NSFontAttributeName: self.font}; 
        CGRect boundingRect = [self.placeholder boundingRectWithSize:rect.size options:0 attributes:attributes context:nil]; 
        [self.placeholder drawAtPoint:CGPointMake(0, (rect.size.height/2)-boundingRect.size.height/2) withAttributes:attributes]; } 
    else { // iOS 6 
        [colour setFill]; 
        [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:NSLineBreakByTruncatingTail alignment:self.textAlignment]; 
    } 
 } 

信用：http://www.brightec.co.uk/blog/how-change-colour-uitextfields-placeholder-text-ios7-and-still-support-ios6

Answer 7

对于 iOS8，您可以利用 @IBDesignable 和 @IBInspectable。

这是 Swift 中的 UITextField 子类，它可以让您在 Interface Builder 中设置占位符颜色并立即查看结果：

@IBDesignable class EDTextField: UITextField {
    @IBInspectable var placeholderColor: UIColor = UIColor.whiteColor() {
        didSet {
            if let placeholder = self.placeholder {
                let attributes = [NSForegroundColorAttributeName: placeholderColor]
                attributedPlaceholder = NSAttributedString(string: placeholder, attributes: attributes)
            }
        }
    }
}

Answer 8

这是更改占位符文本的字体和颜色的最新方法

    self.emailField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Email" attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor],NSFontAttributeName :[UIFont fontWithName:@"OpenSans" size:14.0]}];