处理与论点iphone / ipad的轻拍手势 [英] handle tap gesture with an argument iphone / ipad
问题描述
当我的点击手势触发时,我需要发送一个额外的参数,但我必须做一些非常愚蠢的事情,我在这里做错了什么:
when my tap gesture fires I need to send an additional argument along with it but I must be doing something really silly, what am I doing wrong here:
这里是我的手势被创建和添加:
Here is my gesture being created and added:
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:itemSKU:)];
tapGesture.numberOfTapsRequired=1;
[imageView setUserInteractionEnabled:YES];
[imageView addGestureRecognizer:tapGesture];
[tapGesture release];
[self.view addSubview:imageView];
这是我处理的地方:
-(void) handleTapGesture:(UITapGestureRecognizer *)sender withSKU: (NSString *) aSKU {
NSLog(@"SKU%@\n", aSKU);
}
由于UITapGestureRecognizer init行而无法运行。
and this won't run because of the UITapGestureRecognizer init line.
我需要知道可以识别哪些图像被点击的内容。
I need to know something identifiable about what image was clicked.
推荐答案
A手势识别器只会将一个参数传递给动作选择器:本身。我假设你试图区分主视图的各种图像子视图上的点击?在这种情况下,最好的办法是调用 -locationInView:
,传递superview,然后调用 -hitTest:withEvent:
在该视图上生成 CGPoint
。换句话说,就像这样:
A gesture recognizer will only pass one argument into an action selector: itself. I assume you're trying to distinguish between taps on various image subviews of a main view? In that case, your best bet is to call -locationInView:
, passing the superview, and then calling -hitTest:withEvent:
on that view with the resulting CGPoint
. In other words, something like this:
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTapped:)];
...
- (void)imageTapped:(UITapGestureRecognizer *)sender
{
UIView *theSuperview = self.view; // whatever view contains your image views
CGPoint touchPointInSuperview = [sender locationInView:theSuperview];
UIView *touchedView = [theSuperview hitTest:touchPointInSuperview withEvent:nil];
if([touchedView isKindOfClass:[UIImageView class]])
{
// hooray, it's one of your image views! do something with it.
}
}
这篇关于处理与论点iphone / ipad的轻拍手势的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!