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一.学习手势,首先要先建立一个对象进行操作,我们以一个照片为例.首先创建一个imageView
1.声明一个属性:
@property (nonatomic, retain)UIImageView *imageView;
2.开始真正创建对象
self.imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"beautiful.jpg"]];
self.imageView.frame = CGRectMake(100, 200, 200, 300);
[self.view addSubview:self.imageView];
[_imageView release];
3.如果要创建视图,就要打开图片用户交互功能,默认情况下是NO
self.imageView.userInteractionEnabled = YES;
二,手势的几个常用方法
1.点击事件
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];//初始化方法,添加点击方法名为tapAction:
[self.imageView addGestureRecognizer:tap];//把手势加到指定的视图上
[tap release];
tap.numberOfTouchesRequired = 2;//设置几个手指点击才可响应
tap.numberOfTapsRequired = 2;//设置连续点击几下才可响应
//点击方法
- (void)tapAction:(UITapGestureRecognizer *)tap
{
NSLog(@"我被点击了");
}
2.长按事件
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longpressAction:)];//同样的添加事件,事件名为longpressAction:
[self.imageView addGestureRecognizer:longPress];//把手势添加到imageview上
[longPress release];
longPress.minimumPressDuration = 1;//设置长按触发时间
- (void)longpressAction:(UITapGestureRecognizer *)longpressAction
{
if (longpressAction.state == UIGestureRecognizerStateBegan) {
NSLog(@"长按开始");
}
}
3.旋转
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationAction:)];
[self.imageView addGestureRecognizer:rotation];
[rotation release];
以上创建方法同前两个方法.
- (void)rotationAction:(UIRotationGestureRecognizer *)rotationAction{
//可以通过手势,知道手势添加到那个视图
UIImageView *imageView = (UIImageView *) rotationAction.view;
//找到视图,并且让视图进行旋转
imageView.transform = CGAffineTransformRotate(imageView.transform, rotationAction.rotation);
rotationAction.rotation = 0;
}
4.缩放功能
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[self.imageView addGestureRecognizer:pinch];
[pinch release];
- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
//通过手势,找到视图
UIImageView *imageViews = (UIImageView *) pinch.view;
//找到视图,让视图缩放或者放大
imageViews.transform = CGAffineTransformScale(imageViews.transform, pinch.scale, pinch.scale);
pinch.scale = 1;
}
5.拖拽手势
UIPanGestureRecognizer *tuozhuai = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(tuozhuai:)];
[self.imageView addGestureRecognizer:tuozhuai];
[tuozhuai release];
- (void)tuozhuai:(UIPanGestureRecognizer *)tuozhuai
{
//通过手势,找到视图
UIImageView *imageView = (UIImageView *)tuozhuai.view;
//通过手势,来获取移动的点
CGPoint p = [tuozhuai translationInView:imageView];
// CGPoint p = [tuozhuai trans:imageView];
//通过位置transform实现拖拽
imageView.transform = CGAffineTransformTranslate(imageView.transform, p.x, p.y);
[tuozhuai setTranslation:CGPointZero inView:imageView];
}
//6.清扫手势,此手势是看你的滑动方向
UISwipeGestureRecognizer *qingsao = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(qingsao:)];
[self.view addGestureRecognizer:qingsao];
[qingsao release];
qingsao.direction = UISwipeGestureRecognizerDirectionLeft;//清扫的方向
- (void)qingsao:(UISwipeGestureRecognizer *)qingsao
{
if (qingsao.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"向左进行清扫");
}
}
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原文地址：http://www.cnblogs.com/guominghao/p/4821996.html
