Question

由https://stackoverflow.com/a/46020397/3286489共享，快捷键⌘←←可用于折叠所有功能。但是，当我尝试使用Xcode 10.1时，它无法工作。

⌘←起作用（折叠一个功能）。

此默认快捷方式是否已在Xcode 10.1中删除？

Answer 1

显然，⇧←←仅对函数折叠有效。如果代码中没有函数，那么什么也看不到。但是⌘←可以在类，枚举等上使用。

例如下面的代码使用⌘⇧←

看不到任何效果

extension UIColor {
  open class var brightRedColor: UIColor {
    return UIColor(red: 255.0/255.0, green: 59.0/255.0, blue: 48.0/255.0, alpha: 1.0)
  }
  open class var brightGreenColor: UIColor {
    return UIColor(red: 76.0/255.0, green: 217.0/255.0, blue: 100.0/255.0, alpha: 1.0)
  }
  open class var brightBlueColor: UIColor {
    return UIColor(red: 0.0, green: 122.0/255.0, blue: 1.0, alpha: 1.0)
  }
}

但是在按⌘←←

之后，以下内容确实生效（包括class func）

class BugFactory {

    // MARK: Properties

    static let bugTints: [UIColor] = [.black, .brightBlueColor, .brightRedColor, .brightGreenColor]
    static let shakeRotations = [Double.pi/16, Double.pi/8, Double.pi/8, Double.pi/24]
    static let shakeDurations = [0.3, 3.0, 0.1, 0.5]
    static let bugSize = CGSize(width: 128, height: 128)

    enum BugType: Int {
        case basic, slow, fast, smooth
    }

    var currentBugType = BugType.basic

    // MARK: Create Bug

    func createBug() -> UIImageView {
        let bug = UIImageView(frame: CGRect(x: -100, y: -100, width: 128, height: 128))
        bug.image = UIImage(named: "spider")
        bug.tintColor = BugFactory.bugTints[currentBugType.rawValue]

        // add simple "shake" key-frame animation
        // for explanation, see http://www.objc.io/issue-12/animations-explained.html
        let shakeAnimation = CABasicAnimation(keyPath: "transform.rotation")
        shakeAnimation.toValue = 0.0
        shakeAnimation.fromValue = BugFactory.shakeRotations[currentBugType.rawValue]
        shakeAnimation.duration = BugFactory.shakeDurations[currentBugType.rawValue]
        shakeAnimation.repeatCount = Float.infinity
        shakeAnimation.autoreverses = true
        shakeAnimation.isRemovedOnCompletion = false
        bug.layer.add(shakeAnimation, forKey: "shake")

        return bug
    }

    // MARK: Shared Instance

    class func sharedInstance() -> BugFactory {

        struct Singleton {
            static var sharedInstance = BugFactory()
        }

        return Singleton.sharedInstance
    }
}

折叠所有功能的快捷键←←←在Xcode 10.1中不再起作用？

1 个答案: