ios - UIControlState.Normal不可用

以前，对于UIButton实例，您能够为UIControlState.Normal或setTitle传递setImage。 .Normal不再可用，我应该使用什么呢？

let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
btn.setTitle("title", for: .Normal) // does not compile

(这是一个规范的问答集，可以防止与此iOS 10和Swift 3的UIButton和UIControl更改相关的重复问题泛滥)

最佳答案

Swift 3更新:

看来Xcode 8/Swift 3带回了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，并已从iOS SDK中删除。对于“普通”选项，请使用一个空数组来构造一个空选项集。

let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 20, 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: [])

关于ios - UIControlState.Normal不可用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37800342/