ios 更改 UITextField 占位符字体

Changing UITextField Placeholder font

提问by Bob Yousuk

I'm changing the placeholder text color with the following code, but when I try to add NSFontAttribute I get the compiler error "too many arguments to method call, expect 2 have 3"

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 时出现编译器错误 "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"}]; 

This Works Fine:

这工作正常：

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

回答by ddevaz

Objective-C:

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]
    }
  ];

(There are no brackets between literal dictionarykey-value pairs.)

（文字dictionary键值对之间没有括号。）

Swift:

迅速：

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

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

回答by ayalcinkaya

Update for Swift 4.x:

Swift 4.x 的更新：

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

回答by harthoo

For the convenience of swift people:

为了方便快捷的人：

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

回答by tianglin

You should subclass UITextField, and override the method of：

您应该继承 UITextField，并覆盖以下方法：

- (void)drawPlaceholderInRect:(CGRect)rect;

Here is the implementation below:

下面是实现：

- (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];
}

For more you can find click here

更多你可以找到点击这里

回答by Kampai

Appreciate @ddevaz answer.

感谢@ddevaz 的回答。

UITextField Subclass solution

UITextField 子类解决方案

Above answer works perfect for UITextField. But when i use UITextFieldsubclass and try to execute this method in it. Then its not working.

以上答案适用于UITextField. 但是当我使用UITextField子类并尝试在其中执行此方法时。然后它不工作。

I found other solution only when you subclass UITextField. Override below method in your UITextFieldsubclass and it will do job for you.

仅当您将UITextField. 在您的UITextField子类中覆盖以下方法，它将为您完成工作。

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

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

回答by swift2geek

Working version for Swift 4

Swift 4 的工作版本

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

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

回答by Christopher Larsen

Update for Swift 4

Swift 4 更新

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

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

回答by Laszlo

If you want to support both iOS 6 and previous versions then:

如果你想同时支持 iOS 6 和之前的版本，那么：

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"];
}

回答by Kirtikumar A.

You can use below code First find name of system accepted font for your Custom font

您可以使用以下代码首先为您的自定义字体查找系统接受字体的名称

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

and then use below code make your placeholder with custom font

然后使用下面的代码使用自定义字体制作占位符

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

Else there can be chance to get nil object[1] for font not found

否则有可能为找不到字体而获得 nil object[1]

回答by Longshihua

    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)

Note: when we use UIFont(name: "Menlo", size: 17.0) method, if the font name can't get it in ios , so it will be nil, so we need to provide the default font. It was explained above.

注意：当我们使用 UIFont(name: "Menlo", size: 17.0) 方法时，如果字体名称在 ios 中无法获取，那么它将为零，因此我们需要提供默认字体。上面已经解释过了。

You can use below code First find name of system accepted font for your Custom font

您可以使用以下代码首先为您的自定义字体查找系统接受字体的名称

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