1:本次 touch 坐标
CGPoint point = [[touches anyObject] locationInView:self];
2:上次 touch 坐标
CGPoint prevPoint = [[touches anyObject] previousLocationInView:self];
3:利用 UIPinchGestureRecognizer 实现 View 通过 Transform 缩小放大.
第一步:注册手势捏合识别器
UIPinchGestureRecognizer *pinch = [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(doPinch:)] autorelease]; [self addGestureRecognizer:pinch];
第二步:实现doPinch 方法
#pragma mark - UIPinchGestureRecognizer - (void)doPinch:(UIPinchGestureRecognizer *)pinch { CGAffineTransform newTransform = CGAffineTransformScale(self.transform, pinch.scale, pinch.scale); [self setTransform:newTransform]; [pinch setScale:1]; }
4: UIGestureRecognizer 手势优先级调整(摘自:IOS开发之手势——UIGestureRecognizer 共存)
// 关键在这一行,如果双击确定偵測失败才會触发单击 [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];
5: UIGestureRecognizer 在成功触发事件以后,会有一个 状态来标识手势的实际触发情况,比如什么时候开始的,什么时候结束的 等
if (longGesture.state == UIGestureRecognizerStateBegan)
6:iOS 提供 6种系统级的手势供开发人员使用
1:UITapGestureRecognizer Tap(点一下)
2:UIPinchGestureRecognizer Pinch(二指往內或往外拨动)
3:UIRotationGestureRecognizer Rotation(旋转)
4:UISwipeGestureRecognizer Swipe(滑动,快速移动)
5:UIPanGestureRecognizer Pan (拖移,慢速移动)
6:UILongPressGestureRecognizer LongPress(长按)
1:长按3秒后触发事件
longPressGR.minimumPressDuration = 3;触发后:会调度两次所设定的方法,传入两个状态:
Begin :成功按住那么久时触发
End :松手时触发
7:IOS6之前让UITapGestureRecognizer 和 UIButton 事件共存(iOS6以后默认支持)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch { // 过滤掉UIButton,也可以是其他类型 if ([touch.view isKindOfClass:[UIButton class]]) { return NO; } return YES; }注:如果在iOS6 想让TapGesture的action先执行,需要把cancelsTouchesInView设置成NO.
8:通过平移和速率来实现手势移动的视图交互
CGPoint velocity = [panGestureRecognizer velocityInView:controlPanelWindow];//速率 CGPoint translation = [panGestureRecognizer translationInView:controlPanelWindow];//平移