Swift同时使用多个可选值

此可选值非彼可选值(option)
参考:马克叔_Macro

ObjectiveC:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:@"XXXX" forState:UIControlStateSelected|UIControlStateHighlighted];

Swift:

let button = UIButton(type: .Custom)
button.setTitle("XXXX", forState: [.Selected , .Highlighted])