ios - 更改 UIBarButtonItem 的字体

Question

我的 UIToolbar 中有一个 UIBarButtonItem，标题为 Done。现在我想将字体从默认更改为 "Trebuchet MS" 加粗。我该怎么做？

Answer 1

准确的说，可以按照下面的方式来完成

[buttonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: 
    [UIFont fontWithName:@"Helvetica-Bold" size:26.0], NSFontAttributeName,
    [UIColor greenColor], NSForegroundColorAttributeName,
    nil] 
                          forState:UIControlStateNormal];

或者使用对象字面量语法:

[buttonItem setTitleTextAttributes:@{
     NSFontAttributeName: [UIFont fontWithName:@"Helvetica-Bold" size:26.0],
     NSForegroundColorAttributeName: [UIColor greenColor]
} forState:UIControlStateNormal];

为方便起见，这里是 Swift 实现:

buttonItem.setTitleTextAttributes([
        NSAttributedStringKey.font: UIFont(name: "Helvetica-Bold", size: 26.0)!,
        NSAttributedStringKey.foregroundColor: UIColor.green],
    for: .normal)