以前对于UIButton实例,您可以传入setTitle或set
Image的UIControlState.normal.正常现在不再可用了,应该用什么呢？
let btn = UIButton(frame: CGRect(x: 0,y: 0,width: 20,height: 20))
btn.setTitle("title",for: .normal) // does not compile
(这是一个规范的Q& A对,以防止与这个UIButton和UIControl有关的重复问题的洪水与iOS 10和Swift 3的变化)
解决方法
Swift 3更新：
看来Xcode 8 / Swift 3带来了UIControlState.normal：
public struct UIControlState : OptionSet {
public init(rawValue: UInt)
public static var normal: UIControlState { get }
public static var highlighted: UIControlState { get } // used when UIControl isHighlighted is set
public static var disabled: UIControlState { get }
public static var selected: UIControlState { get } // flag usable by app (see below)
@available(iOS 9.0,*)
public static var focused: UIControlState { get } // Applicable only when the screen supports focus
public static var application: UIControlState { get } // additional flags available for application use
public static var reserved: UIControlState { get } // flags reserved for internal framework use
}
UIControlState.normal已重命名为UIControlState.normal并从iOS SDK中删除.对于“正常”选项,使用空数组来构造一个空选项集.
let btn = UIButton(frame: CGRect(x: 0,height: 20))
// Does not work
btn.setTitle("title",for: .normal) // 'normal' has been renamed to 'normal'
btn.setTitle("title",for: .normal) // 'normal' is unavailable: use [] to construct an empty option set
// Works
btn.setTitle("title",for: [])