UIGestureRecognizer
为了完成手势识别，必须借助于手势识别器—-UIGestureRecognizer，利用UIGestureRecognizer，能轻松识别用户在某个view上面做的一些常见手势UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，使用它的子类才能处理具体的手势，要实现<UIGestureRecognizerDelegate>
手势状态：
typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
UIGestureRecognizerStatePossible, // 尚未识别是何种手势操作（但可能已经触发了触摸事件），默认状态
UIGestureRecognizerStateBegan, // 手势已经开始，此时已经被识别，但是这个过程中可能发生变化，手势操作尚未完成
UIGestureRecognizerStateChanged, // 手势状态发生转变
UIGestureRecognizerStateEnded, // 手势识别操作完成（此时已经松开手指）
UIGestureRecognizerStateCancelled, // 手势被取消，恢复到默认状态
UIGestureRecognizerStateFailed, // 手势识别失败，恢复到默认状态
UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded // 手势识别完成，同UIGestureRecognizerStateEnded };
常用的六种手势：
- 轻击手势（TapGestureRecognizer）
- 轻扫手势 （SwipeGestureRecognizer）
- 长按手势（LongPressGestureRecognizer）
- 拖动手势（PanGestureRecognizer）
- 捏合手势（PinchGestureRecognizer）
- 旋转手势（RotationGestureRecognizer）
1． 轻击手势（TapGestureRecognizer）
1) 初始化轻击手势识别器对象
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
2) 设置手势识别器对象的具体属性
// 连续敲击2次
tap.numberOfTapsRequired = 2;
// 需要2根手指一起敲击
tap.numberOfTouchesRequired = 2;
//添加手势识别器到对应的view上
[self.iconView addGestureRecognizer:tap];
3) 监听手势的触发
[tap addTarget:self action:@selector(tapIconView:)];
4) 代理
tap.delegate = self;
//轻击手势触发方法
-(void) tapIconView:(UITapGestureRecognizer *)sender
{
NSLog(@"我用两只手指敲击屏幕成功了！");
}
#pragma mark - 代理方法
/**
* 当点击view的时候,会先调用这个方法
*/
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
CGPoint pos = [touch locationInView:touch.view];
if (pos.x <= self.iconView.frame.size.width * 0.5) {
return YES;
}
return NO;
}
2． 轻扫手势 （SwipeGestureRecognizer）
-
初始化轻扫手势识别器对象 UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)]; //设置轻扫的向右方向 swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //向右 [self.view addGestureRecognizer:swipeGesture]; UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)]; //设置轻扫的方向 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //向左 [self.view addGestureRecognizer:swipeGestureLeft]; //轻扫手势触发方法 -(void)swipeGesture:(id)sender { UISwipeGestureRecognizer *swipe = sender; if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) { //向左轻扫 } if (swipe.direction == UISwipeGestureRecognizerDirectionRight) { //向右轻扫 } }
3． 长按手势（LongPressGestureRecognizer）
初始化轻扫手势识别器对象
UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
//设置长按时间
longPressGesture.minimumPressDuration = 0.5;
[self.view addGestureRecognizer:longPressGesture];
//长按手势触发方法
-(void)longPressGesture:(id)sender
{
UILongPressGestureRecognizer *longPress = sender;
if (longPress.state == UIGestureRecognizerStateBegan)
{
//your code
}
}
说明：长按手势的常用状态如下
开始：UIGestureRecognizerStateBegan
改变：UIGestureRecognizerStateChanged
结束：UIGestureRecognizerStateEnded
取消：UIGestureRecognizerStateCancelled
失败：UIGestureRecognizerStateFailed
4． 拖动手势（PanGestureRecognizer）
初始化轻扫手势识别器对象
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
[self.view addGestureRecognizer:panGesture];
//拖动手势触发方法
-(void) panGesture:(id)sender
{
UIPanGestureRecognizer *panGesture = sender;
CGPoint movePoint = [panGesture translationInView:self.view];
//your code
}
5． 捏合手势（PinchGestureRecognizer）
初始化轻扫手势识别器对象
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
[self.view addGestureRecognizer:panGesture];
//拖动手势触发方法
-(void) panGesture:(id)sender
{
UIPanGestureRecognizer *panGesture = sender;
CGPoint movePoint = [panGesture translationInView:self.view];
//your code
}
6． 旋转手势（RotationGestureRecognizer）
初始化轻扫手势识别器对象
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
[self.view addGestureRecognizer:rotationGesture];
//旋转手势触发方法
-(void)rotationGesture:(id)sender
{
UIRotationGestureRecognizer *gesture = sender;
if (gesture.state==UIGestureRecognizerStateChanged)
{
_imageView.transform=CGAffineTransformMakeRotation(gesture.rotation);
}
if(gesture.state==UIGestureRecognizerStateEnded)
{
[UIView animateWithDuration:1 animations:^{
_imageView.transform=CGAffineTransformIdentity;//取消形变
}];
}
}
时间： 2024-08-06 03:28:21