swift - Xcode 9 RespondsToSelector Issue -


nsobject 'responds' method seems broken on latest version of xcode 9 beta 4, swift version 4.0.

below example code tested on xcode 8 (works fine), on xcode 9 method 'responds' returns false situations.

any appreciated.

public class worker : nsobject {     public func work() { }     public func eat(_ food: anyobject) { }     public func sleep(_ hours: int,_ minutes: int) { } }  let worker = worker()  let canwork = worker.responds(to: selector(("work")))   // true let caneat = worker.responds(to: selector(("eat:")))    // true let cansleep = worker.responds(to: selector(("sleep:minutes:")))    // true let canquit = worker.responds(to: selector(("quit")))   // false

example source : https://stackoverflow.com/a/24168825

there's nothing wrong responds method. due se-0160 implemented in swift 4, these methods no longer automatically exposed objective-c.

if add @objc start of each method signature (that want expose objective-c), find responds returns true.

public class worker : nsobject {     @objc public func work() { }     @objc public func eat(_ food: anyobject) { }     @objc public func sleep(_ hours: int,_ minutes: int) { } }

alternatively, can add @objmembers class expose all of methods objective-c.

@objmembers public class worker : nsobject {     public func work() { }     public func eat(_ food: anyobject) { }     public func sleep(_ hours: int,_ minutes: int) { } }

your third selector syntax wrong. should "sleep::" because minutes label not used due preceding _.


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