在UIScrollView中向标准Pan Gesture Recognizer添加功能 [英] Add functionality to standard Pan Gesture Recognizer in a UIScrollView
问题描述
我正在尝试跟踪手指在 UIScrollView
中的位置。
我有 UIScrollView
(见下文),但不幸的是我添加的手势识别器覆盖了标准的手势识别器。
I am trying to keep track of where a finger is in a UIScrollView
.
I have subclassed UIScrollView
(see below) but unfortunately the gesture recognizer that I am adding is overriding the standard one.
结果我得到 NSLog(@Pan)
可以工作,但不幸的是视图不再滚动了。
As a result I get NSLog(@"Pan")
to work but unfortunately the view doesn't scroll anymore.
如何让两个手势识别器同时工作?
How can I get both gestures recognizers to work at the same time?
谢谢。
- (void)viewDidLoad:(BOOL)animated
{
[super viewDidLoad:animated];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[scrollView addGestureRecognizer:panRecognizer];
}
- (void)pan:(id)sender {
NSLog(@"Pan");
}
推荐答案
编辑:这种方法有效!您只需要尽快设置 canCancelContentTouches
(我在 viewDidLoad
中设置)。
EDIT: this method works! You just need to set canCancelContentTouches
as soon as possible (I do it in viewDidLoad
).
原始答案:我尝试了一种新的方法,但不幸的是它没有完全发挥作用。
ORIGINAL ANSWER: I have tried a new approach but unfortunately it doesn't fully work.
添加手势识别器我正在继承 UIScrollView
并编写我自己的 touchesBegan
, touchesMoved
等方法。
Instead of adding a gesture recognizer I am subclassing the UIScrollView
and writing my own touchesBegan
, touchesMoved
, etc methods.
这样我知道用户在哪里触摸但不幸的是PanGestureRecognizer正在触发 touchesCancelled
每次我开始滚动,即使将 canCancelContentTouches
设置为NO 。
This way I know where the user is touching BUT unfortunately the PanGestureRecognizer is triggering touchesCancelled
every time I start to scroll even after setting the canCancelContentTouches
to NO.
有人知道为什么吗?我还找到了这个。
Does anybody know why? I have also found this.
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