iOS：手势与矩形、点运算相关（18-01-24更）

1、矩形、点运算

　　1、获取当前的View在Window的frame

　　2、包含判断

　　3、获取点击在响应者 touchesBegan 的位置

　　4、UIScrollView、UITableView 实时 位置 相关

2、手势

　　1、点击（UITapGestureRecognizer）

　　2、拖移（UIPanGestureRecognizer）、轻扫（UISwipeGestureRecognizer）

　　3、长按（UILongPressGestureRecognizer）

　　4、旋转（UIRotationGestureRecognizer）

　　5、捏合（UIPinchGestureRecognizer）

3、触摸

　　

0、写在前面 

　　可通过 NSStringFromCGPoint 等方法，用"%@"调试输出，不用再 point.x、point.y 列出来。rect 方法同。

1、矩形、点运算

　　1、获取当前的View在Window的frame

UIWindow * window=[[[UIApplication sharedApplication] delegate] window];  
CGRect rect=[_myButton convertRect:_myButton.bounds toView:window];

 　　后续补充：

　　　　toView:nil 。参数置空，相当于默认window。

　　　　相关的（layer 也有类似）：

　　　　　　- (CGPoint)convertPoint:(CGPoint)point toView:(nullable UIView *)view;

　　　　　　- (CGPoint)convertPoint:(CGPoint)point fromView:(nullable UIView *)view;

　　　　　　- (CGRect)convertRect:(CGRect)rect toView:(nullable UIView *)view;

　　　　　　- (CGRect)convertRect:(CGRect)rect fromView:(nullable UIView *)view;

　　　　　　toView，当前的点，是调用者的坐标系，想切换到view的坐标系。

　　　　　　fromView，当前的点，是fromView的坐标系，想切换到调用者的坐标系。

　　2、包含判断

// 矩形 包含 该矩形
CGRectContainsRect
// 矩形 包含 该点？
CGRectContainsPoint

　　3、获取点击在响应者 touchesBegan 的位置

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self];
    NSLog(@"%@",NSStringFromCGPoint(point));
}

　　4、UIScrollView、UITableView 实时 位置 相关

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    // scrollView 的偏移量
    scrollView.contentOffset
    // 当前手指在 windows 的位置
    [scrollView.panGestureRecognizer locationInView:nil];
    // 相对 手指按下时 的位移
    [scrollView.panGestureRecognizer translationInView:nil];
    // 移动的加速度
    [scrollView.panGestureRecognizer velocityInView:nil];
}

　　

2、手势

　　1、点击（UITapGestureRecognizer）

//单击
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
[self.view addGestureRecognizer:tapGesture];
    
//双击
UITapGestureRecognizer *doubleTapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTapAction:)];
doubleTapGesture.numberOfTapsRequired = 2;	//设置次数
[self.view addGestureRecognizer:doubleTapGesture];

//双击优先
[tapGesture requireGestureRecognizerToFail:doubleTapGesture];

-(void)doubleTapAction:(UITapGestureRecognizer*)gesture
{
    NSLog(@"双击了");
}

-(void)tapAction:(UITapGestureRecognizer*)gesture
{
    NSLog(@"单击了");
}

　　2、拖移（UIPanGestureRecognizer）、轻扫（UISwipeGestureRecognizer）

//拖移
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[self.view addGestureRecognizer:panGesture];

//轻扫
UISwipeGestureRecognizer *swipGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipAciton:)];
swipGesture.direction = UISwipeGestureRecognizerDirectionLeft;		//设置方向
[self.view addGestureRecognizer:swipGesture];

//轻扫优先
[panGesture requireGestureRecognizerToFail:swipGesture];

-(void)swipAciton:(UISwipeGestureRecognizer*)gesture
{
    NSLog(@"轻扫");
}

-(void)panAction:(UIPanGestureRecognizer*)gesture
{
    CGPoint point = [gesture locationInView:self.view];
    NSLog(@"%@",NSStringFromCGPoint(point));
}

　　　　后续补充：轻扫想要识别向左还是向右，需要建2个轻扫的手势！

　　　　　　　　　如果只建1个，设（左 | 右）方向，那么响应的函数，会显示（左 | 右）触发，无法辨别！

　　3、长按（UILongPressGestureRecognizer）

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
longPress.minimumPressDuration = 2.0;	//最短时间
[self.view addGestureRecognizer:longPress];


-(void)longPressAction:(UILongPressGestureRecognizer*)longAction
{
    if (longAction.state == UIGestureRecognizerStateBegan) {
        NSLog(@"长按开始");
    }else if(longAction.state == UIGestureRecognizerStateChanged)
    {
        NSLog(@"长按位置改变");
        return;
    
    }else if(longAction.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"长按结束");
        return;
    }
}

　　4、旋转（UIRotationGestureRecognizer）

UIRotationGestureRecognizer *rotateGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateAction:)];
[self.view addGestureRecognizer:rotateGesture];


-(void)rotateAction:(UIRotationGestureRecognizer*)gesture
{
    NSLog(@"%f",gesture.rotation*(180/M_PI));
}

　　5、捏合（UIPinchGestureRecognizer）

UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
[self.view addGestureRecognizer:pinchGesture];

CGFloat _lastValue;

-(void)pinchAction:(UIPinchGestureRecognizer *)pinch
{
    if (_lastValue > pinch.scale) {
        _imageView.transform = CGAffineTransformScale(_imageView.transform, 0.8, 0.8);
    }else{
        _imageView.transform = CGAffineTransformScale(_imageView.transform, 1.2, 1.2);
    }
    _lastValue = pinch.scale;
}

　　

3、触摸

//触摸开始
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSLog(@"开始触摸");

    [self.view endEditing:YES];


    UITouch *touch = [touches anyObject];
    if (touch.tapCount == 1) 
	{
        [self performSelector:@selector(singleClick) withObject:nil afterDelay:0.3];
    }
	else if(touch.tapCount == 2)
	{
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(singleClick) object:nil];
        NSLog(@"双击");
    }

    //locationInView 在视图上的定位
    CGPoint point = [touch locationInView:self];
    NSLog(@"%@",NSStringFromCGPoint(point));
}

-(void)singleClick
{
    NSLog(@"单击");
}

-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSLog(@"触摸结束");
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSLog(@"触摸移动");
}

-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //电话呼入
    NSLog(@"取消触摸");
}