Swift：向上滑动时出错

Posted 2023-03-04

【中文标题】Swift：向上滑动时出错

【英文标题】：Swift : Error when swiping up

【发布时间】：2015-12-24 07:01:29

【问题描述】：

当我尝试向上滑动手势时，我不断收到这些错误。 “向右”滑动没问题，但“向上”滑动会引发错误。

任何帮助都会很棒。

提前致谢。

2015-12-24 14:53:36.977 滑动和摇动[58213:9895793] -[Swipes___Shake.ViewController 滑动]：无法识别的选择器发送到实例 0x7fc549ea4400

2015-12-24 14:53:36.982 Swipes & Shake[58213:9895793] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[Swipes___Shake.ViewController 刷卡]：无法识别的选择器发送到实例0x7fc549ea4400'

libc++abi.dylib：以 NSException 类型的未捕获异常终止 (lldb)

import UIKit

class ViewController: UIViewController 

override func viewDidLoad() 
    super.viewDidLoad()
    var swipeRight = UISwipeGestureRecognizer(target: self, action: "swiped:")
    swipeRight.direction = UISwipeGestureRecognizerDirection.Right
    self.view.addGestureRecognizer(swipeRight)
    
    var swipeUp = UISwipeGestureRecognizer(target: self, action: "swiped")
    swipeUp.direction = UISwipeGestureRecognizerDirection.Up
    self.view.addGestureRecognizer(swipeUp)
    

func swiped(gesture: UIGestureRecognizer)

    if let swipeGesture =  gesture as? UISwipeGestureRecognizer
    
        switch swipeGesture.direction
        
        case UISwipeGestureRecognizerDirection.Right:
            print("RIGHT")
        case UISwipeGestureRecognizerDirection.Up:
            print("UP")
        default:
            break
        
    


override func didReceiveMemoryWarning() 
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

【参考方案1】：

您在var swipeUp = UISwipeGestureRecognizer(target: self, action: "swiped") 中的swiped 之后错过了:

正确的是var swipeUp = UISwipeGestureRecognizer(target: self, action: "swiped:")

【讨论】：

非常感谢。我根本没有注意到它