手势使用方法
1.创建手势
2.添加手势
3.实现手势方法
添加点按手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
//手势也可以设置代理
tap.delegate = self;
//添加手势
[self.imageV addGestureRecognizer:tap];
代理方法:
是否允许接收手指
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
让图片的左边不可以点击,
获取当前手指所在的点.是在图片的左边还是在图片的右边.
CGPoint curP = [touch locationInView:self.imageV];
if (curP.x > self.imageV.bounds.size.width * 0.5) {
在图片的右侧
return YES;
}else{
在图片的左侧
return NO;
}
return YES;
}
添加长按手势
UILongPressGestureRecognizer *longP = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longP:)];
[self.imageV addGestureRecognizer:longP];
//当长按时调用.
//这个方法会调用很多次, 当手指长按在上面不松,来回移动时,会持续调用.
//所以要判断它的状态.
- (void)longP:(UILongPressGestureRecognizer *)longP{
if(longP.state == UIGestureRecognizerStateBegan){
NSLog(@"开始长按");
}else if(longP.state == UIGestureRecognizerStateChanged){
NSLog(@"长按时手指移动");
}else if(longP.state == UIGestureRecognizerStateEnded){
NSLog(@"手指离开屏幕");
}
}
添加轻扫手势
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
//轻扫手势默认是向右边称轻扫
//可以设置轻扫的方法.
//一个轻扫手势只能设置一个方法的轻扫.想要让它有多个方向的手势,必须得要设置的
swipe.direction = UISwipeGestureRecognizerDirectionLeft;
[self.imageV addGestureRecognizer:swipe];
//添加轻扫手势
UISwipeGestureRecognizer *swipe2 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
//轻扫手势默认是向右边称轻扫
//可以设置轻扫的方法.
//一个轻扫手势只能设置一个方法的轻扫.想要让它有多个方向的手势,必须得要设置的
swipe2.direction = UISwipeGestureRecognizerDirectionUp;
[self.imageV addGestureRecognizer:swipe2];
- (void)swipe:(UISwipeGestureRecognizer *)swipe{
//判断的轻扫的方向
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"向左轻扫");
}else if(swipe.direction == UISwipeGestureRecognizerDirectionUp){
NSLog(@"向上轻扫");
}
}
添加平移手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[self.imageV addGestureRecognizer:pan];
//当手指拖动时调用
- (void)pan:(UIPanGestureRecognizer *)pan{
//拖动手势也有状态
if(pan.state == UIGestureRecognizerStateBegan){
// 开始拖动
}else if(pan.state == UIGestureRecognizerStateChanged){
// 可能获取不当前手指移动的举例
//是相对于最原始的点
CGPoint transP = [pan translationInView:self.imageV];
//会清空上一次的形变
self.imageV.transform = CGAffineTransformMakeTranslation(transP.x,transP.y);
self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform, transP.x, transP.y);
// 复位,让它相对于上一次.
[pan setTranslation:CGPointZero inView:self.imageV];
}else if(pan.state == UIGestureRecognizerStateEnded){
// 结束拖动
}
}
添加捏合手势
UIPinchGestureRecognizer *pinGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinGes:)];
//设置代理使其能够同时支持多个手势
pinGes.delegate = self;
[self.imageV addGestureRecognizer:pinGes];
//旋转时调用
- (void)pinGes:(UIPinchGestureRecognizer *)pin{
self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pin.scale, pin.scale);
//复位
[pin setScale:1];
}
添加旋转手势
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
//设置代理使其能够同时支持多个手势
rotation.delegate = self;
[self.imageV addGestureRecognizer:rotation];
//当手指开始旋转时调用.
- (void)rotation:(UIRotationGestureRecognizer *)rotation{
self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotation.rotation);
//复位.
[rotation setRotation:0];
}
