手势识别器

在实现手势识别器之前 需要建立 一个UIImageView来存放图片

原代码:

UIImage *image =[UIImage imageNamed:@"图片名.后缀"];

self.imageView =[[UIImageView alloc ] initWithImage:image];
self.imageView.frame =CGRectMake(30, 100, 300, 400);
[self.view addSubview:self.imageView];
[self.imageView release];

手势的使用

1.点击

原代码:

UITapGestureRecognizer *tap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
设置点击几次才能触发方法(默认是1)
tap.numberOfTapsRequired =2;
设置几根手指进行点击(默认是1)
tap.numberOfTouchesRequired =1;
将手势添加到图片上
[self.imageView addGestureRecognizer:tap];
[tap release];
#pragma mark 点击的方法
-(void)tapClick:(UITapGestureRecognizer *)tap{
NSLog(@"测试一下手势");
self.imageView.image =[UIImage imageNamed:@"7af40ad162d9f2d3efbd7dd2abec8a136327cc5b.jpg"];
}

2.长按

UILongPressGestureRecognizer *longPress =[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressClick:)];

设置长按触发的最小时间(默认是0.5)

longPress.minimumPressDuration =0.5;

用户手指在长按过程中允许移动的距离(默认是10)

longPress.allowableMovement =200;

把手势添加到图片中

[self.imageView addGestureRecognizer:longPress];

[longPress release];

#pragma mark 长按对应的响应方法

-(void)longPressClick:(UILongPressGestureRecognizer *)longPress{

NSLog(@”测试长按手势”);

// 长按的状态

// longPress.state;

长按之后弹出一个UIAlertView

if(self.alertView == nil){

self.alertView =[[UIAlertView alloc] initWithTitle:@”长按” message:@”进入” delegate:self cancelButtonTitle:@”确定” otherButtonTitles:@”取消”, nil];

}

[self.alertView show];

[self.alertView release];

self.alertView =nil;

}

3.旋转

创建一个旋转的手势
UIRotationGestureRecognizer *rotation=[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationClick:)];
把手势放到对应的图片上
[self.imageView addGestureRecognizer:rotation];
释放
[rotation release];

#pragma mark 旋转对应的响应方法(通过图片的手势,让图片发生旋转)
-(void)rotationClick:(UIRotationGestureRecognizer *)rotation{

// 可以通过手势获取手势添加的是图示是哪一个
UIImageView *imageView = (UIImageView *)rotation.view;

// 进行旋转的操作
// 通过视图的transfrom属性,让视图进行旋转
//    imageView.transform =CGAffineTransformMakeRotation(rotation.rotation);
imageView.transform =CGAffineTransformRotate(imageView.transform, rotation.rotation);
// 防止转的太快,斗;
rotation.rotation =0;
}

4.捏合

创建
UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc ] initWithTarget:self action:@selector(pinchClick:)];
添加到图片上
[self.imageView addGestureRecognizer:pinch];
释放
[pinch release];
#pragma mark 捏合对应的响应方法 (通过捏合手势,缩放图片)

-(void)pinchClick:(UIPinchGestureRecognizer *)pinch{
// 通过手势找到对应的视图
UIImageView *imageView =(UIImageView *)pinch.view;

// 进行捏合的操作
// 通过transform改变图片的尺寸
imageView.transform =CGAffineTransformScale(imageView.transform, pinch.scale, pinch.scale);
// 为了防止手势的变化让图片直接消失(停止动作)
pinch.scale =1;
}

5.拖拽

UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panClick:)];
[self.imageView addGestureRecognizer:pan];
[pan release];
#pragma mark 拖拽对应的响应方法(通过拖拽手势,让视图随着手势移动)

-(void)panClick:(UIPanGestureRecognizer *)pan{
// 通过手势找视图
UIImageView *imageView =(UIImageView *)pan.view;
// 通过手势获得经过的点
//    imageView.transform =CGAffineTransformMakeScale(pan., <#CGFloat sy#>)
CGPoint p=[pan translationInView:imageView];
//设置移动的位置
imageView.transform =CGAffineTransformTranslate(imageView.transform, p.x, p.y);
// 为了防止手势在操作的时候视图消失
[pan setTranslation:CGPointZero inView:imageView];
}

6.轻扫

UISwipeGestureRecognizer *swipe=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeClick:)];
[self.imageView addGestureRecognizer:swipe];
[swipe release];
轻扫的方向
向右
swipe.direction =UISwipeGestureRecognizerDirectionRight;
# pragma mark 轻扫对应的响应
-(void)swipeClick:(UISwipeGestureRecognizer *)swipe{
if (swipe.direction ==UISwipeGestureRecognizerDirectionRight ) {
NSLog(@"向右");
}
}