UIControlState.Normal 不可用 [英] UIControlState.Normal is Unavailable

问题描述

以前对于UIButton 实例，您可以为setTitle 或setImage 传入UIControlState.Normal..Normal 不再可用，我应该用什么代替?

Previously for UIButton instances, you were able to pass in UIControlState.Normal for setTitle or setImage. .Normal is no longer available, what should I use instead?

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对，以防止与 iOS 10 和 Swift 3 的 UIButton 和 UIControl 更改相关的重复问题泛滥)}

^{(This is a canonical Q&A pair to prevent the flood of duplicate questions related to this UIButton and UIControl changes with iOS 10 and Swift 3)}

推荐答案

Swift 3 更新:

Swift 3 update:

看起来 Xcode 8/Swift 3 把 UIControlState.normal 带回来了:

It appears that Xcode 8/Swift 3 brought UIControlState.normal back:

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.对于普通"选项，使用空数组构造空选项集.

UIControlState.Normal has been renamed to UIControlState.normal and removed from the iOS SDK. For "Normal" options, use an empty array to construct an empty option set.

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: [])

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