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])