ios - 继承 UIButton 并设置 fontSize

Question

我正在子类化 UIButton 以设置应用程序的一些默认值，但由于某种原因我无法更改字体大小。

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // id button, set defaults
        [self setTintColor:[UIColor blueColor]];
        [self.titleLabel setFont:[UIFont systemFontOfSize:40.0]];
        [self.layer setBorderWidth:1.0f];
        [self.layer setBorderColor:[[UIColor blackColor] CGColor]];
    }
    return self;
}

我可以改变颜色和其他属性，但不能改变字体大小，它没有效果吗？

    idButton *LButton = [idButton buttonWithType:UIButtonTypeRoundedRect];
    [LButton setTitle:@"Login" forState:UIControlStateNormal];
    LButton.frame = CGRectMake(0, buttonY+(buttonHeight/2), screenWidth, buttonHeight);
    [self addSubview:LButton];

Answer 1

您的代码存在问题，UIButton 的方法 setTitle:forState: 会将字体重置为默认值。

一种解决方案是覆盖此方法以使用 NSAttributedString。这也将允许您设置其他属性:

- (void) setTitle:(NSString *)customTitle forState:(UIControlState)state {
    if (customTitle) {
        NSMutableAttributedString *mas = [[NSMutableAttributedString alloc] initWithString:customTitle];
        NSRange range = NSMakeRange(0, [customTitle length]);

        [mas addAttribute:NSFontAttributeName
                    value:[UIFont systemFontOfSize:40.0]
                    range:range];

        [mas addAttribute:NSKernAttributeName
                    value:@(1.1)
                    range:range];

        [self setAttributedTitle:mas forState:state];
    } else {
        [super setTitle:customTitle forState:state];
    }
}