我得到了一个UILabel的子类:我想使用这个标签作为titleLabel of UIButton:
class MyButton: UIButtonoverride open var titleLabel: MyLabel?Release-iphonesimulator/vieww/vieww.framework/Headers/vieww-Swift.h:197:63:警告:属性类型'MyLabel * _Nulla
我正在尝试创建UIActionSheet的小用户界面,我想在UIActionSheet的按钮中显示大文本。UIActionSheet *)actionSheet { if ([subview isKindOfClass:[UIButtonclass]]) { UIFont *textFont=[UIFont f