iPhone的UITextField-更改占位符文本颜色

我想改变占位符文本我在我的UITextField控件设置的颜色，使其变黑。 我宁愿做这个正常的文本占位符，不得不重写所有模仿一个占位符的行为。 我相信，如果我重写

- (void)drawPlaceholderInRect:(CGRect)rect

..那么我应该能够做到这一点。但我不能确定如何从内部访问实际的占位符对象
本文地址 ：CodeGo.net/78370/
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1. 您可以覆盖drawPlaceholderInRect：（的CGRect）RECT因此手动呈现占位符文本：

- (void) drawPlaceholderInRect:(CGRect)rect { [[UIColor blueColor] setFill]; [[self placeholder] drawInRect:rect withFont:[UIFont systemFontOfSize:16]];}

2. 因为在引入归因串UIViewS IN的iOS 6，有可能的颜色分配给这样的占位符文本：

if ([textField respondsToSelector:@selector(setAttributedPlaceholder:)]) { UIColor *color = [UIColor blackColor]; textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:placeholderText attributes:@{NSForegroundColorAttributeName: color}];} else { NSLog(@"Cannot set placeholder text's color, because deployment target is earlier than iOS 6.0"); // TODO: Add fall-back code to set placeholder color.}

3. 也许你想尝试这种方式，但苹果可能会警告您访问私有伊娃：

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

注这不是工作在iOS上7了，根据马丁Alléus。
4. 您可以更改的占位符文本颜色您要下面的代码的任何颜色。

UIColor *color = [UIColor lightTextColor];YOURTEXTFIELD.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"PlaceHolder Text" attributes:@{NSForegroundColorAttributeName: color}];

5. 覆盖drawPlaceholderInRect:将正确的方法，但它并不因API中的错误的工作（或 永远不被调用上UITextField。 另请参阅 你digdog的解决方案。由于我不知道那些通过了苹果的审核，我选择了不同的解决方案：用我自己的标签模仿占位符的行为叠加文本字段。 这是一个虽然。该代码如下所示（请注意，我的TextField类的子类里面做这个）：

@implementation PlaceholderChangingTextField- (void) changePlaceholderColor:(UIColor*)color{  // Need to place the overlay placeholder exactly above the original placeholder UILabel *overlayPlaceholderLabel = [[[UILabel alloc] initWithFrame:CGRectMake(self.frame.origin.x + 8, self.frame.origin.y + 4, self.frame.size.width - 16, self.frame.size.height - 8)] autorelease]; overlayPlaceholderLabel.backgroundColor = [UIColor whiteColor]; overlayPlaceholderLabel.opaque = YES; overlayPlaceholderLabel.text = self.placeholder; overlayPlaceholderLabel.textColor = color; overlayPlaceholderLabel.font = self.font; // Need to add it to the superview, as otherwise we cannot overlay the buildin text label. [self.superview addSubview:overlayPlaceholderLabel]; self.placeholder = nil;}

6. 荫新的Xcode CodeGo.net，我找到了一种方法来左右的效果。 我把一个UILabel到位占位与所需的格式，并把它藏在

- (void)textFieldDidBeginEditing:(UITextField *)textField{ switch (textField.tag) {  case 0:   lblUserName.hidden=YES;   break;  case 1:   lblPassword.hidden=YES;   break;  default:   break; }}

我同意它周围的工作，而不是一个真正的解决方案，但效果是从这个链接得到它
7. 的iOS 6和更高版本提供了“attributedPlaceholder”上的UITextField。的iOS 3.2和更高版本提供“setAttributes：范围：”上NSMutableAttributedString。 您可以执行以下操作：

 NSMutableAttributedString *ms = [[NSMutableAttributedString alloc] initWithString:self.yourInput.placeholder]; UIFont *placeholderFont = self.yourInput.font; NSRange fullRange = NSMakeRange(0, ms.length); NSDictionary *newProps = @{NSForegroundColorAttributeName:[UIColor yourColor], NSFontAttributeName:placeholderFont}; [ms setAttributes:newProps range:fullRange]; self.yourInput.attributedPlaceholder = ms;

8. 保留占位符的空白，并把标签上的编辑按钮的上方-不需要子类化的另一个选择。管理就像你将管理的占位符的标签（清除输入任何东西..）
9. 我需要保持占位符所以亚当的回答是不够的 为了解决这个小的变化，我希望能帮助你吧：

- (void) drawPlaceholderInRect:(CGRect)rect { //search field placeholder color UIColor* color = [UIColor whiteColor]; [color setFill]; [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment];}

10. 对于MonoTouch的（Xamarin.iOS），这里是亚当的回答，翻译成C＃中：

public class MyTextBox : UITextField{ public override void DrawPlaceholder(RectangleF rect) {  UIColor.FromWhiteAlpha(0.5f, 1f).SetFill();  new NSString(this.Placeholder).DrawString(rect,     UIFont.FromName(MyAppearance.RegularFontName, 16f)); }}

11. 尽我所能为IOS7，少做的是：

- (CGRect)placeholderRectForBounds:(CGRect)bounds { return [self textRectForBounds:bounds];}- (CGRect)editingRectForBounds:(CGRect)bounds { return [self textRectForBounds:bounds];}- (CGRect)textRectForBounds:(CGRect)bounds { CGRect rect = CGRectInset(bounds, 0, 6); //TODO: can be improved by comparing font size versus bounds.size.height return rect;}- (void)drawPlaceholderInRect:(CGRect)rect { UIColor *color =RGBColor(65, 65, 65); if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) { [self.placeholder drawInRect:rect withAttributes:@{NSFontAttributeName:self.font, UITextAttributeTextColor:color}]; } else { [color setFill]; [self.placeholder drawInRect:rect withFont:self.font]; }}

12. 使用KVC

[yourtextfield setValue:[UIColor colorWithRed:120.0/255.0 green:116.0/255.0 blue:115.0/255.0 alpha:1.0] forKeyPath:@"_placeholderLabel.textColor"];

你可以设置你自己的颜色来占位符
13. 处理垂直和水平，以及在IOS7占位符的颜色。 drawInRect和drawAtPoint没有当前上下文FILLCOLOR。OBJ-C

@interface CustomPlaceHolderTextColorTextField : UITextField@end@implementation CustomPlaceHolderTextColorTextField : UITextField-(void) drawPlaceholderInRect:(CGRect)rect { if (self.placeholder) { // color of placeholder text UIColor *placeHolderTextColor = [UIColor redColor]; CGSize drawSize = [self.placeholder sizeWithAttributes:[NSDictionary dictionaryWithObject:self.font forKey:NSFontAttributeName]]; CGRect drawRect = rect; // verticially align text drawRect.origin.y = (rect.size.height - drawSize.height) * 0.5; // set alignment NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.alignment = self.textAlignment; // dictionary of attributes, font, paragraphstyle, and color NSDictionary *drawAttributes = @{NSFontAttributeName: self.font,          NSParagraphStyleAttributeName : paragraphStyle,          NSForegroundColorAttributeName : placeHolderTextColor}; // draw [self.placeholder drawInRect:drawRect withAttributes:drawAttributes]; }}@end

14. 我建议另一种解决方案。由于占位符文本框的默认字体设置，只需设置初始字体颜色为你想要的占位符，字体颜色。然后设置你的UITextField的委托和

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ //set color for text input textField.textColor = [UIColor blackColor]; return YES;}- (BOOL)textFieldShouldClear:(UITextField *)textField{ //set color for placeholder text textField.textColor = [UIColor redColor]; return YES;}