Question

我们的项目有自定义UICollectionViewCell，可以使用UITapGestureRecognizers处理单击和双击，以及使用单击UITapGestureRecognizer的子视图。

这就是我们项目中单击/双击设置的方式：

    _singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    _singleTapGestureRecognizer.numberOfTapsRequired = 1;
    [self addGestureRecognizer:_singleTapGestureRecognizer];

    _doubleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    _doubleTapGestureRecognizer.numberOfTapsRequired = 2;
    [self addGestureRecognizer:_doubleTapGestureRecognizer]

    [_singleTapGestureRecognizer requireGestureRecognizerToFail:_doubleTapGestureRecognizer];

在我们的代码中，我们还通过执行这些来取消单/双击，

    self.singleTapGestureRecognizer.enabled = NO;

    self.doubleTapGestureRecognizer.enabled = NO;
    self.doubleTapGestureRecognizer.enabled = YES;

    self.singleTapGestureRecognizer.enabled = YES;

这些曾经在iOS9之前的设备上运行得很好，但是，我发现在iOS9设备上，从不触发双击。每当我试图双击该单元时，它立即记录一次，几乎没有延迟。

当我试图查看它时，我发现当注册singleTapGestureRecognizer时，doubleTapGestureRecognizer仍处于可能未失败的状态。

single tap: <UITapGestureRecognizer: 0x7f94ead42220; state = Ended; view = <UIView 0x7f94ead3f710>; target= <(action=handleSingleTap:, target=<PVEntityStreamCellForSetOnboarding 0x7f94ead3f1e0>)>; must-fail = {
<UITapGestureRecognizer: 0x7f94ead42810; state = Possible; view = <UIView 0x7f94ead3f710>; target= <(action=handleDoubleTap:, target=<PVEntityStreamCellForSetOnboarding 0x7f94ead3f1e0>)>; numberOfTapsRequired = 2>
}>

我还发现如果我首先点击包含另一个UITapGestureRecognizer的子视图，那么双击将起作用，一旦我滚动集合视图，就不可能双击任何单元格。

有没有人有类似的问题或知道如何解决这个问题？

Answer 1

我有一个类似的问题，在我的情况下，修复程序是为singleTapGestureRecognizer实现委托方法。我也尝试使用取消单/双击，但没有成功。现在，我的代码看起来像这样（它是用swift编写的，但它很容易阅读）：

let singleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: Selector("handleSingleTap:"))
let doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: Selector("handleDoubleTap:"))

singleTapGestureRecognizer.numberOfTapsRequired = 1
doubleTapGestureRecognizer.numberOfTapsRequired = 2

singleTapGestureRecognizer.delegate = self

singleTapGestureRecognizer.requireGestureRecognizerToFail(doubleTapGestureRecognizer)
view.addGestureRecognizer(singleTapGestureRecognizer)
view.addGestureRecognizer(doubleTapGestureRecognizer)

双击单元格在iOS9上不起作用

1 个答案: