UIGestureRecognizer手势识别器
手势:有规律的触摸
UIGestureRecognizer抽象类
七种手势:轻拍(tap)长按(longPress)旋转(rotation)捏合(pinch)拖拽(pan)轻扫(swipe)屏幕边缘拖拽(screenEdgePan)
轻拍tap
创建对象
获取到轻拍手势时让self调用tapAction:方法
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(tapAction:)];
添加手势
[imgView addGestureRecognizer:tap];
内存管理
[tap release];
点击次数
tap.numberOfTapsRequired =2;
手指个数
tap.numberOfTouchesRequired =2;
#pragma mark -轻拍tap
- (void)tapAction:(UITapGestureRecognizer*)tap
{
NSLog(@"轻拍");
}
长按longPress
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:selfaction:@selector(longPressAction:)];
[imgView addGestureRecognizer:longPress];
[longPress release];
长按时间
longPress.minimumPressDuration =1;
#pragma mark -长按longPress
- (void)longPressAction:(UILongPressGestureRecognizer*)longPress
{
if(longPress.state==UIGestureRecognizerStateBegan) {
NSLog(@"长按");
}
}
旋转rotation
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:selfaction:@selector(rotationAction:)];
[imgView addGestureRecognizer:rotation];
[rotation release];
#pragma mark -旋转rotation
- (void)rotationAction:(UIRotationGestureRecognizer*)rotation
{
*UIView transform属性专门用来进行形变(位置position/旋转rotation/缩放scale)设置
UIImageView*imgView = (UIImageView*)rotation.view;
imgView.transform=CGAffineTransformMakeRotation(rotation.rotation);
NSLog(@"旋转");
}
捏合pinch
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:selfaction:@selector(pinchAction:)];
[imgView addGestureRecognizer:pinch];
[pinch release];
#pragma mark -捏合pinch
- (void)pinchAction:(UIPinchGestureRecognizer*)pinch
{
UIImageView*imgView = (UIImageView*)pinch.view;
imgView.transform=CGAffineTransformMakeScale(pinch.scale, pinch.scale);
//缩放scale(比例)(下面两行代码效果等同于上一行)
// imgView.transform = CGAffineTransformScale(imgView.transform, pinch.scale, pinch.scale);
// pinch.scale = 1;
NSLog(@"捏合");
}
拖拽pan
UIPanGestureRecognizer*pan = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(panAction:)];
[imgViewaddGestureRecognizer:pan];
[panrelease];
#pragma mark -拖拽pan
- (void)panAction:(UIPanGestureRecognizer*)pan
{
NSLog(@"拖拽");
UIImageView*imgView = (UIImageView*)pan.view;
CGPointp = [pantranslationInView:imgView];
imgView.transform=CGAffineTransformMakeTranslation(p.x, p.y);
//设置跟随属性(下面两行代码效果等同于上一行)
// imgView.transform = CGAffineTransformTranslate(imgView.transform, p.x, p.y);
// [pan setTranslation:CGPointZero inView:imgView];
}
轻扫swipe
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(swipeAction:)];
默认只识别向右
设置方向时最多只能设置水平(左/右)或者垂直(上/下)
swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;
[imgView addGestureRecognizer:swipe];
[swipe release];
#pragma mark -轻扫swipe
- (void)swipeAction:(UISwipeGestureRecognizer*)swipe
{
if(swipe.direction==UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"向左");
}
NSLog(@"轻扫");
}
屏幕边缘拖拽screenEdgePan
UIScreenEdgePanGestureRecognizer*sep = [[UIScreenEdgePanGestureRecognizeralloc]initWithTarget:selfaction:@selector(sepAction:)];
sep.edges=UIRectEdgeLeft;
[self.viewaddGestureRecognizer:sep];
[seprelease];
#pragma mark -屏幕边缘拖拽screenEdgePan
- (void)sepAction:(UIScreenEdgePanGestureRecognizer*)sep
{
NSLog(@"屏幕边缘");
}
