UIImageView响应点击事件

最新推荐文章于 2017-09-13 21:06:35 发布

转载最新推荐文章于 2017-09-13 21:06:35 发布 · 526 阅读

本文介绍如何在iOS应用中实现不同类型的触控手势识别，包括单指单击、单指双击、双指单击和双指双击，并通过具体代码示例展示了如何设置手势识别器及其相关事件处理。

UIImageView *imageView = [self getYourImageView];
imageView.image = [self getYourImage];
imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourHandlingCode:)];
[imageView addGestureRecognizer:singleTap];
[singleTap release];

//单指单击

UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSingleFingerEvent:)];
singleFingerOne.numberOfTouchesRequired = 1; //手指数
singleFingerOne.numberOfTapsRequired = 1; //tap次数
singleFingerOne.delegate = self;

//单指双击
UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSingleFingerEvent:)];
singleFingerTwo.numberOfTouchesRequired = 1;
singleFingerTwo.numberOfTapsRequired = 2;
singleFingerTwo.delegate = self;
//双指单击
UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleDoubleFingerEvent:)];
doubleFingerOne.numberOfTouchesRequired = 2;
doubleFingerOne.numberOfTapsRequired = 1;
doubleFingerOne.delegate = self;
UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleDoubleFingerEvent:)];
doubleFingerTwo.numberOfTouchesRequired = 2;
doubleFingerTwo.numberOfTapsRequired = 2;
doubleFingerTwo.delegate = self;
//如果不加下面的话，当单指双击时，会先调用单指单击中的处理，再调用单指双击中的处理
[singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];
//同理双指亦是如此
[doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];
[self.view addGestureRecognizer:singleFingerOne];
[self.view addGestureRecognizer:singleFingerTwo];
[self.view addGestureRecognizer:doubleFingerOne];
[self.view addGestureRecognizer:doubleFingerTwo];
[singleFingerOne release];
[singleFingerTwo release];
[doubleFingerOne release];
[doubleFingerTwo release];
处理事件的方法，代码：
//处理单指事件
- (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender
{
if (sender.numberOfTapsRequired == 1) {
//单指单击
NSLog(@"单指单击");
}else if(sender.numberOfTapsRequired == 2){
//单指双击
NSLog(@"单指双击");
}
}
//处理双指事件
- (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender
{
if (sender.numberOfTapsRequired == 1) {
//双指单击
NSLog(@"双指单击");
}else if(sender.numberOfTapsRequired == 2){
//双指双击
NSLog(@"双指双击");
}
}