Question

我正在使用以下代码更改占位符文本颜色，但是当我尝试添加NSFontAttribute时，我收到编译器错误"too many arguments to method call, expect 2 have 3"

 UIColor *color = [UIColor blackColor];
        _nameField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Your Name" attributes:@{NSForegroundColorAttributeName: color},@{NSFontAttributeName:@"Roboto-Bold"}];

此工作正常：

 UIColor *color = [UIColor blackColor];
        _nameField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Your Name" attributes:@{NSForegroundColorAttributeName: color}];

Answer 1

<强>目标-C：

UIColor *color = [UIColor blackColor];    
someUITextField.attributedPlaceholder =
  [[NSAttributedString alloc] initWithString:@"Placeholder Text"
    attributes:@{
       NSForegroundColorAttributeName: color,
       NSFontAttributeName : [UIFont fontWithName:@"Roboto-Bold" size:17.0]
    }
  ];

（文字dictionary键值对之间没有括号。）

<强>夫特：

let attributes = [
    NSForegroundColorAttributeName: UIColor.blackColor(),
    NSFontAttributeName : UIFont(name: "Roboto-Bold", size: 17)! // Note the !
]

someUITextField.attributedPlaceholder = NSAttributedString(string: "Placeholder Text", attributes:attributes)

Answer 2

更新 Swift 4.x ：

textField.attributedPlaceholder = NSAttributedString(string: "Placeholder Text", attributes: [
    .foregroundColor: UIColor.lightGray,
    .font: UIFont.boldSystemFont(ofSize: 14.0)
])

Answer 3

为了方便快捷的人：

someTextField.attributedPlaceholder = NSAttributedString(string: "someString", 
attributes:[NSForegroundColorAttributeName: UIColor.lightGrayColor(), NSFontAttributeName: PlaceHolderFont])

Answer 4

您应该继承UITextField，并覆盖以下方法：

- (void)drawPlaceholderInRect:(CGRect)rect;

以下是以下实现：

- (void)drawPlaceholderInRect:(CGRect)rect {
     NSDictionary *attributes = @{
                             NSForegroundColorAttributeName : [UIColor lightGrayColor],
                             NSFontAttributeName : [UIFont italicSystemFontOfSize:self.font.pointSize]
                             };
    // center vertically
    CGSize textSize = [self.placeholder sizeWithAttributes:attributes];
    CGFloat hdif = rect.size.height - textSize.height;
    hdif = MAX(0, hdif);
    rect.origin.y += ceil(hdif/2.0);
    [[self placeholder] drawInRect:rect withAttributes:attributes];
}

您可以找到更多click here

Answer 5

欣赏@ddevaz答案。

UITextField子类解决方案

以上回答适用于UITextField。 但是当我使用UITextField子类并尝试在其中执行此方法时。然后它无法正常工作。

我只在你继承UITextField时找到了其他解决方案。在UITextField子类中覆盖以下方法，它将为您完成任务。

- (void) drawPlaceholderInRect:(CGRect)rect {
    NSDictionary *attrDictionary = @{
                                     NSForegroundColorAttributeName: [UIColor lightGrayColor],
                                     NSFontAttributeName : [UIFont fontWithName:@"Menlo" size:17.0]
                                     };

    [[self placeholder] drawInRect:rect withAttributes:attrDictionary];
}

Answer 6

Swift 4的工作版

let attributes = [NSAttributedStringKey.foregroundColor: UIColor.black,
                      .font : UIFont.systemFont(ofSize: 14, weight: .regular)]

someTextfield.attributedPlaceholder = NSAttributedString(string: "Placeholder text", attributes:attributes)

Answer 7

Swift 4的更新

let attributes = [
    NSAttributedStringKey.foregroundColor: .black,
    NSAttributedStringKey.font : UIFont(name: "Your font name", size: 14)!
]

someTextfield.attributedPlaceholder = NSAttributedString(string: "Placeholder text", attributes:attributes)

Answer 8

如果您想同时支持iOS 6和以前的版本：

UIColor *placeholderColor = [UIColor lightTextColor];
UIFont *placeholderFont = [UIFont systemFontOfSize:[UIFont systemFontSize]];

if ([textField respondsToSelector:@selector(attributedPlaceholder)]) {
#ifdef __IPHONE_6_0
    textField.attributedPlaceholder = [[NSAttributedString alloc]
        initWithString:textField.placeholder attributes: // NOTE: textField.placeholder can't be nil
              @{ NSForegroundColorAttributeName : placeholderColor,
                 NSFontAttributeName : placeholderFont }];
#endif
} else { // for pre-iOS6
    [textField setValue:placeholderColor forKeyPath:@"_placeholderLabel.textColor"];
    [textField setValue:placeholderFont forKeyPath:@"_placeholderLabel.font"];
}

Answer 9

针对Swift 4.2的更新+

let attributes = [NSAttributedString.Key.foregroundColor: UIColor.black,
                  .font: UIFont.systemFont(ofSize: 14)]

searchTextField.attributedPlaceholder = NSAttributedString(string: "Placeholder text",
                                                           attributes: attributes)

更多属性键的参考-NSAttributedString.Key

Answer 10

您可以使用以下代码首先找到自定义字体的系统接受字体名称

for (NSString *familyName in [UIFont familyNames]) {
    for (NSString *fontName in [UIFont fontNamesForFamilyName:familyName]) {
        NSLog(@"%@", fontName);
    }
}

然后使用下面的代码使您的占位符具有自定义字体

searchTextField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Where are you shopping?" attributes:@{NSFontAttributeName : font }];

否则，有机会获得未找到字体的nil对象[1]

Answer 11

    let attributes: [NSAttributedStringKey : Any] = [NSAttributedStringKey.foregroundColor: UIColor.black,
 NSAttributedStringKey.font: UIFont(name: "Menlo", size: 17.0) ?? UIFont.systemFont(ofSize: 17.0) ]


    textField.attributedPlaceholder = NSAttributedString(string: "Placeholder Text", attributes: attributes)

注意：当我们使用UIFont（名称：“Menlo”，大小：17.0）方法时，如果字体名称无法在ios中获取，那么它将为nil，因此我们需要提供默认字体。上面已经解释过了。

您可以使用以下代码首先查找自定义字体的系统接受字体名称

for (NSString *familyName in [UIFont familyNames]) {
    for (NSString *fontName in [UIFont fontNamesForFamilyName:familyName]) {
    NSLog(@"%@", fontName);
   }
 }

Answer 12

快速4：占位符使用UITextField子类的颜色更改

override func drawPlaceholder(in rect: CGRect) {

        let color = UIColor(red: 210/255, green: 210/255, blue: 210/255, alpha: 1.0)

        if (placeholder?.responds(to: #selector(NSString.draw(in:withAttributes:))))! {

            let fontS = UIFont.systemFont(ofSize: 12)

            let attributes = [NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: fontS] as [NSAttributedStringKey : Any]

            let boundingRect: CGRect = placeholder!.boundingRect(with: rect.size, options: [], attributes: attributes, context: nil)

            placeholder?.draw(at: CGPoint(x: 0, y: (rect.size.height / 2) - boundingRect.size.height / 2), withAttributes: attributes)
        }

 }

Answer 13

如果我也有问题。我通过设置字体解决，因为在stroryboard中设置字体或在self.emailTextField.placeholder中设置字体时，某些时间的字体无法更改。

self.emailTextField.font = UIFont(..custom you font....)

Answer 14

只需执行此操作，即可更改文本和占位符的字体大小。

field.font = .systemFont(ofSize: 16)

更改UITextField占位符字体

14 个答案:

UITextField子类解决方案