创建 UIButton

UIButtons 可以在框架中初始化：

迅速

let button = UIButton(frame: CGRect(x: x, y: y, width: width, height: height)

目标 C.

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, y, width, height)];

可以像这样创建特定类型的 UIButton：

迅速

let button = UIButton(type: .Custom) 

目标 C.

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

其中 type 是 UIButtonType：

enum UIButtonType : Int {
    case Custom
    case System
    case DetailDisclosure
    case InfoLight
    case InfoDark
    case ContactAdd
    static var RoundedRect: UIButtonType { get }
}