UITextField在iOS中将占位符颜色设置为暗色

问题描述：

我试图将 UITextField 占位符颜色设置为暗。

I have tried to set UITextField "Placeholder" color as dark.

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

textField.attributedPlaceholder = search;

但仍然 UITextField 在占位符中显示浅灰色。

是否可以设置深色占位符 UITextField 的颜色？

Is it possible to set dark "placeholder" color for UITextField?

另外我也尝试了另一种方法

Also I Have tried the another method as well
```
[textField setValue:[UIColor blackColor] forKeyPath:@"_placeholderLabel.textColor"];
```
但这两种方法都适用于 iOS 7 ，但不能正常工作 iOS 6 。

But both methods are working in iOS 7, But not working on iOS 6.
- 是否可以为占位符颜色 iOS 6 目标中的code> UITextField ？
- Is it possible to set dark "placeholder" color for UITextField in iOS 6 target?
谢谢！

答

正如Apple建议的那样，继承UITextField并覆盖 - （void）drawPlaceholderInRect：（CGRect）rect 是要走的路：

As suggested by Apple, subclassing UITextField and overriding - (void)drawPlaceholderInRect:(CGRect)rect is the way to go:

- (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

UITextField在iOS中将占位符颜色设置为暗色

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