ios - UIControlState.Normal 不可用

Question

以前对于UIButton实例，您可以传入UIControlState.NormalforsetTitle或setImage。 .Normal不再可用，我应该改用什么？

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，以防止与此相关的重复问题泛滥，UIButton并UIControl随着 iOS 10 和 Swift 3 的变化而发生变化）}

Answer 1

斯威夫特 3 更新：

Xcode 8/Swift 3 似乎带回UIControlState.normal了：

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UIControlState.normal并从 iOS SDK 中删除。对于“正常”选项，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: [])

Answer 2

Apple 在最新版本的 Xcode 测试版中恢复了正常控制状态。升级到最新的 Xcode 测试版并使用.normal.

Answer 3

已.Normal删除（iOS 10 DP1），您可以使用[]或UIControlState(rawValue: UInt(0))替换.Normal，如果您不想更改所有代码（以防苹果再次添加或您不喜欢[]），您只需添加一次这段代码

extension UIControlState {
    public static var Normal: UIControlState { return [] }
}

或者

extension UIControlState {
    public static var Normal: UIControlState { return UIControlState(rawValue: UInt(0)) }
}

然后像以前一样进行所有.Normal工作。

Answer 4

斯威夫特 5

替换自

btn.setTitle("title", for: .Normal)

至

btn.setTitle("title", for: UIControl.State.normal)