iPhone UITextField-更改占位符文本颜色

我想更改在UITextField控件中设置的占位符文本的颜色，以使其变为黑色。

我宁愿在不使用普通文本作为占位符的情况下执行此操作，也不必重写所有方法来模仿占位符的行为。

我相信如果我重写此方法：

- (void)drawPlaceholderInRect:(CGRect)rect

那么我应该能够做到这一点。但是我不确定如何从此方法中访问实际的占位符对象。

#1楼

我是Xcode的新手，我找到了一种实现相同效果的方法。

我将uilabel放置在所需格式的占位符上，并将其隐藏在

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

我同意它是可以解决的，而不是真正的解决方案，但是从此链接获得的效果是相同的

注意：在iOS 7上仍然可以使用：

#2楼

由于iOS 6在UIViews中引入了属性字符串，因此可以为占位符文本分配颜色，如下所示：

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楼

我需要保持占位符对齐，因此亚当的答案对我来说还不够。

为了解决这个问题，我使用了一个小的变体，希望对您有所帮助：

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

#4楼

对于使用Monotouch（Xamarin.iOS）的用户，以下是亚当的答案，已翻译为C＃：

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

#5楼

对于iOS7及以下版本，我能做的最好的事情是：

- (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.heightreturn 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];}
}

#6楼

iOS 6和更高版本在UITextField上提供了attributedPlaceholder 。 iOS 3.2及更高版本在NSMutableAttributedString上提供了setAttributes:range: 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;

#7楼

在iOS7中处理垂直和水平对齐以及占位符的颜色。 drawInRect和drawAtPoint不再使用当前上下文fillColor。

https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/CustomTextProcessing/CustomTextProcessing.html

对象

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

#8楼

您可以使用以下代码将占位符文本颜色更改为所需的任何颜色。

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

#9楼

也许您想尝试这种方式，但是Apple可能会警告您有关访问私有ivar的信息：

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

注意
根据MartinAlléus的说法，这不再适用于iOS 7。

#10楼

为什么不只使用UIAppearance方法：

[[UILabel appearanceWhenContainedIn:[UITextField class], nil] setTextColor:[UIColor whateverColorYouNeed]];

#11楼

简单且无痛苦，对于某些人来说可能是一个简单的选择。

_placeholderLabel.textColor

不建议生产，Apple可能会拒绝您的提交。

#12楼

[txt_field setValue:ColorFromHEX(@"#525252") forKeyPath:@"_placeholderLabel.textColor"];

#13楼

以下仅适用于iOS6 +（如Alexander W的评论所示）：

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

#14楼

类别FTW。可以进行优化以检查有效的颜色变化。

#import <UIKit/UIKit.h>@interface UITextField (OPConvenience)@property (strong, nonatomic) UIColor* placeholderColor;@end#import "UITextField+OPConvenience.h"@implementation UITextField (OPConvenience)- (void) setPlaceholderColor: (UIColor*) color {if (color) {NSMutableAttributedString* attrString = [self.attributedPlaceholder mutableCopy];[attrString setAttributes: @{NSForegroundColorAttributeName: color} range: NSMakeRange(0,  attrString.length)];self.attributedPlaceholder =  attrString;}
}- (UIColor*) placeholderColor {return [self.attributedPlaceholder attribute: NSForegroundColorAttributeName atIndex: 0 effectiveRange: NULL];
}@end

#15楼

覆盖drawPlaceholderInRect:是正确的方法，但是由于API（或文档）中的错误而无法使用。

该方法永远不会在UITextField上调用。

另请参见UITextField上的drawTextInRect未调用

您可以使用digdog的解决方案。由于我不确定是否能通过Apple审查，因此我选择了另一种解决方案：用我自己的标签覆盖文本字段，以模仿占位符行为。

不过这有点混乱。代码看起来像这样（注意，我正在TextField的子类中执行此操作）：

@implementation PlaceholderChangingTextField- (void) changePlaceholderColor:(UIColor*)color
{    // Need to place the overlay placeholder exactly above the original placeholderUILabel *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;
}

#16楼

在Swift中：

if let placeholder = yourTextField.placeholder {yourTextField.attributedPlaceholder = NSAttributedString(string:placeholder, attributes: [NSForegroundColorAttributeName: UIColor.blackColor()])
}

在Swift 4.0中：

if let placeholder = yourTextField.placeholder {yourTextField.attributedPlaceholder = NSAttributedString(string:placeholder, attributes: [NSAttributedStringKey.foregroundColor: UIColor.black])
}

#17楼

对于iOS 6.0 +

[textfield setValue:your_color forKeyPath:@"_placeholderLabel.textColor"];

希望能帮助到你。

注意： 由于我们正在访问私有API，Apple可能会拒绝（0.01％的机会）您的应用程序。 自两年以来，我在所有项目中都使用了此功能，但Apple并没有要求这样做。

#18楼

在Swift <3.0中可以使用：

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

在iOS 8.2和iOS 8.3 beta 4中进行了测试。

斯威夫特3：

myTextfield.attributedPlaceholder =
NSAttributedString(string: "placeholder text", attributes: [NSForegroundColorAttributeName : UIColor.red])

斯威夫特4：

myTextfield.attributedPlaceholder =
NSAttributedString(string: "placeholder text", attributes: [NSAttributedStringKey.foregroundColor: UIColor.red])

Swift 4.2：

myTextfield.attributedPlaceholder =
NSAttributedString(string: "placeholder text", attributes: [NSAttributedString.Key.foregroundColor: UIColor.red])

#19楼

我已经遇到了这个问题。就我而言，以下代码是正确的。

目标C

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

对于Swift 4.X

tf_mobile.setValue(UIColor.white, forKeyPath: "_placeholderLabel.textColor")

对于iOS 13 Swift代码

tf_mobile.attributedPlaceholder = NSAttributedString(string:"PlaceHolder Text", attributes: [NSAttributedString.Key.foregroundColor: UIColor.red])

您还可以针对iOS 13使用以下代码

let iVar = class_getInstanceVariable(UITextField.self, "_placeholderLabel")!
let placeholderLabel = object_getIvar(tf_mobile, iVar) as! UILabel
placeholderLabel.textColor = .red

希望对您有所帮助。

#20楼

您可以像这样重写drawPlaceholderInRect:(CGRect)rect来手动呈现占位符文本：

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

#21楼

同样在情节提要中，无需单行代码

#22楼

这样我们就可以在iOS中更改文本字段占位符文本的颜色

[self.userNameTxt setValue:[UIColor colorWithRed:41.0/255.0 green:91.0/255.0 blue:106.0/255.0 alpha:1.0] forKeyPath:@"_placeholderLabel.textColor"];

#23楼

对于具有多种颜色的设置属性文本字段占位符，

只需指定Text，

  //txtServiceText is your Textfield_txtServiceText.placeholder=@"Badal/ Shah";NSMutableAttributedString *mutable = [[NSMutableAttributedString alloc] initWithString:_txtServiceText.placeholder];[mutable addAttribute: NSForegroundColorAttributeName value:[UIColor whiteColor] range:[_txtServiceText.placeholder rangeOfString:@"Badal/"]]; //Replace it with your first color Text[mutable addAttribute: NSForegroundColorAttributeName value:[UIColor orangeColor] range:[_txtServiceText.placeholder rangeOfString:@"Shah"]]; // Replace it with your secondcolor string._txtServiceText.attributedPlaceholder=mutable;

输出：-

#24楼

迅捷版。可能会帮助某人。

class TextField: UITextField {override var placeholder: String? {didSet {let placeholderString = NSAttributedString(string: placeholder!, attributes: [NSForegroundColorAttributeName: UIColor.whiteColor()])self.attributedPlaceholder = placeholderString}}
}

#25楼

对于Xamarin.iOS开发人员，我从此文档https://developer.xamarin.com/api/type/Foundation.NSAttributedString/中找到了它

textField.AttributedPlaceholder = new NSAttributedString ("Hello, world",new UIStringAttributes () { ForegroundColor =  UIColor.Red });

#26楼

另一个不需要子类化的选项-将占位符留空，然后在“编辑”按钮的顶部放置一个标签。就像管理占位符一样管理标签（用户输入任何内容时清除。）

#27楼

Swift 3.0 +故事板

为了在情节提要中更改占位符颜色，请使用下一个代码创建扩展。（可以随意更新此代码，如果您认为它可以更清晰，更安全）。

extension UITextField {@IBInspectable var placeholderColor: UIColor {get {guard let currentAttributedPlaceholderColor = attributedPlaceholder?.attribute(NSForegroundColorAttributeName, at: 0, effectiveRange: nil) as? UIColor else { return UIColor.clear }return currentAttributedPlaceholderColor}set {guard let currentAttributedString = attributedPlaceholder else { return }let attributes = [NSForegroundColorAttributeName : newValue]attributedPlaceholder = NSAttributedString(string: currentAttributedString.string, attributes: attributes)}}
}

Swift 4版本

extension UITextField {@IBInspectable var placeholderColor: UIColor {get {return attributedPlaceholder?.attribute(.foregroundColor, at: 0, effectiveRange: nil) as? UIColor ?? .clear}set {guard let attributedPlaceholder = attributedPlaceholder else { return }let attributes: [NSAttributedStringKey: UIColor] = [.foregroundColor: newValue]self.attributedPlaceholder = NSAttributedString(string: attributedPlaceholder.string, attributes: attributes)}}
}

Swift 5版本

extension UITextField {@IBInspectable var placeholderColor: UIColor {get {return attributedPlaceholder?.attribute(.foregroundColor, at: 0, effectiveRange: nil) as? UIColor ?? .clear}set {guard let attributedPlaceholder = attributedPlaceholder else { return }let attributes: [NSAttributedString.Key: UIColor] = [.foregroundColor: newValue]self.attributedPlaceholder = NSAttributedString(string: attributedPlaceholder.string, attributes: attributes)}}
}

#28楼

在Swift 3中

import UIKitlet TEXTFIELD_BLUE  = UIColor.blue
let TEXTFIELD_GRAY  = UIColor.grayclass DBTextField: UITextField {/// Tetxfield Placeholder Color@IBInspectable var palceHolderColor: UIColor = TEXTFIELD_GRAYfunc setupTextField () {self.attributedPlaceholder = NSAttributedString(string:self.placeholder != nil ? self.placeholder! : "",attributes:[NSForegroundColorAttributeName: palceHolderColor])}
}class DBLocalizedTextField : UITextField {override func awakeFromNib() {super.awakeFromNib()self.placeholder = self.placeholder}
}

#29楼

迅速3.X

textField.attributedPlaceholder = NSAttributedString(string: "placeholder text", attributes:[NSForegroundColorAttributeName: UIColor.black])

迅速5

textField.attributedPlaceholder = NSAttributedString(string: "placeholder text", attributes: [NSAttributedString.Key.foregroundColor : UIColor.black])

#30楼

Swift 4.1的此解决方案

    textName.attributedPlaceholder = NSAttributedString(string: textName.placeholder!, attributes: [NSAttributedStringKey.foregroundColor : UIColor.red])

#31楼

带CAVEAT的Swift 5。

let attributes = [ NSAttributedString.Key.foregroundColor: UIColor.someColor ]
let placeHolderString = NSAttributedString(string: "DON'T_DELETE", attributes: attributes)
txtField.attributedPlaceholder = placeHolderString

请注意，即使在其他代码中设置了该字符串，也必须在“ DON'T_DELETE”所在的位置输入非空String 。可能会节省您五分钟的时间。