ios - Swift 如何解决发送到实例 0x7fa9e0d8b7c0 的无法识别的选择器

Question

我在我的collectionviewcell中添加了长按

lp = UILongPressGestureRecognizer(target: self, action: Selector("longPress:"))
lp.delegate = self
cell.tag = indexPath.row
cell.addGestureRecognizer(lp)

但是如果我推送到其他 viewController 并通过滑动弹出，项目将会崩溃!

所以我寻找网站来解决这个问题，我知道原因是我没有获得委托(delegate)的 UIGestureRecognizer

func gestureRecognizerShouldBegin(g: UIGestureRecognizer) -> Bool {

    return true
}

我得到了这个异常

gestureRecognizerShouldBegin:]: unrecognized selector sent to instance 0x7fa9e0d8b7c0 2015-03-15 18:56:08.733 PicMemo[62182:5214628]Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PicMemo.iViewController gestureRecognizerShouldBegin:]: unrecognized selector sent to instance 0x7fa9e0d8b7c0'

我想我在 uilongpressgesturerecognizer crashes even if not implemented 中找到了解决方案

但我不知道如何使用 Swift。

Answer 1

感谢@HotLicks 有一个解决方案: 我们应该添加UIGestureRecognizerDelegate 然后添加

self.navigationController?.interactivePopGestureRecognizer.delegate = self

终于

func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer!) -> Bool {

    //self.navigationController?.popViewControllerAnimated(true) is also ok
    self.navigationController?.popToRootViewControllerAnimated(true)
    return true;
}