Objectivec 更改 UITextField 占位符字体

发布于08月15日

我正在用下面的代码更改占位符文本的 colored颜色，但是当我try 添加NSFontAttribute时，我得到了编译器错误"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:

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

推荐答案

Objective-C:

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

(文本dictionary个键值对之间没有括号.)

Swift:

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

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