Question

以前，对于UIButton个实例，您可以为UIControlState.Normal或setTitle传递setImage。 .Normal已不再可用，我应该使用什么？

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Q＆amp; A对，用于防止与iOS 10和Swift 3中此UIButton和UIControl更改相关的重复问题泛滥}

Answer 1

Swift 3更新：

似乎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中移除。对于＆＃34;正常＆＃34; options，使用空数组构造一个空选项集。

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

.Normal已删除（iOS 10 DP1），您可以使用[]或UIControlState(rawValue: UInt(0))替换.Normal，如果您不想更改代码（如果苹果再次添加或您不喜欢[]），您只需添加一次此代码

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

或

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

然后所有.Normal都像之前一样工作。

Answer 3

Apple在更新版本的Xcode beta中恢复了正常的控制状态。升级到最新的Xcode测试版并使用.normal。

Answer 4

快速5

替换为

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

到

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

UIControlState.Normal不可用

4 个答案: