- 响应触摸方法：
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchesBegan");
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchesMoved");
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchesEnded");
}
//当系统事件（如内存不足、电话呼入）终止了触摸事件时响应该方法
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchesCancelled");
}
- 添加了手势的控件常需要设置的属性：
(UILabel,UIImageVIew默认不允许用户交互)
//UILabel默认不允许用户交互，故如此设置
_lbtext.userInteractionEnabled = YES;
//设置控件为多点触控
_lbtext.multipleTouchEnabled = YES;
-
手势处理器 UIGestureRecognizer
UIGestureRecognizer是所有手势控制器的基类，它提供了如下子类：- UITapGestureRecognizer：轻拍手势
- UIPinchGestureRecognizer ： 捏合手势
- UIPanGestureRecognizer ：拖拽手势
- UISwipeGestureRecognizer ： 轻扫手势
- UIRotationGestureRecognizer ：旋转手势
- UILongPressGestureRecognizer ：长按手势
UITapGestureRecognizer 轻拍 －常用于 “加在空白处，关闭键盘”
UITapGestureRecognizer *tapGesture2
= [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(closeKey)];
[self.view addGestureRecognizer:tapGesture2];
-(void)closeKey{
[self.view endEditing:YES];
}
- UISwipeGestureRecognizer 轻扫
特有属性： dirction：设置轻扫的方向，支持上，下，左，右四个方向。
（设置四个方向的轻扫）
for (int i=0; i<4; i++) {
UISwipeGestureRecognizer *swipeGesture
= [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeHandle:)];
[swipeGesture setDirection:1<<i];
[self.view addGestureRecognizer:swipeGesture];
}
-(void)swipeHandle:(UISwipeGestureRecognizer *)recognizer{
switch (recognizer.direction) {
case UISwipeGestureRecognizerDirectionUp:
NSLog(@"向上滑");
break;
case UISwipeGestureRecognizerDirectionDown:
NSLog(@"向下滑");
break;
case UISwipeGestureRecognizerDirectionRight:
NSLog(@"向右滑");
break;
case UISwipeGestureRecognizerDirectionLeft:
NSLog(@"向左滑");
break;
default:
break;
}
}
- 拖动时候肯定有个速度，返回值就是你拖动时X和Y轴上的速度，速度是矢量，有方向。
CGPoint velocity = [(UIPanGestureRecognizer *)gestureRecognizer velocityInView:self.view];
参考资料：
