IOS UI初级-触摸与手势的基本概念和用法

1.在iOS上，事件有多种形式

①触摸事件

②运动事件

③远程控制事件

2.触摸事件的处理方法

//开启多点触控

        self.multipleTouchEnabled = YES;

//手指点击时，触发的事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //屏幕上点击手指的个数
    NSInteger count = touches.count;
//    NSLog(@"touchesBegan %ld",count);
    //拿到一个点击的对象
    UITouch *touch = touches.anyObject;
    UIView *touchView = touch.view;
    NSLog(@"self---%@  touchView-----%@", self, touchView);//同一个
    UIWindow *touchWindow = touch.window;
    NSLog(@"self window-----%@, touchWindow---%@",self.window, touchWindow);//同一个
   
    //拿到点击次数
    NSInteger tapCount = touch.tapCount;
//    NSLog(@"%ld", tapCount);
    if (tapCount == 1) {
//        NSLog(@"单击");
        //延迟调用
        [self performSelector:@selector(singleTap) withObject:nil afterDelay:0.5];
//        [self singleTap];
    }else if (tapCount == 2){
//        NSLog(@"双击");
        //取消某个方法
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(singleTap) object:nil];
        [self doubleTap];
    }

}

//手指滑动时，触发的事件
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
//    NSLog(@"touchesMoved");
    //取到一个touch对象
    UITouch *touch = touches.anyObject;
    //拿到当前点击的坐标
    CGPoint nowLocation = [touch locationInView:self];
    //拿到上一次的坐标
    CGPoint lastLocation = [touch previousLocationInView:self];
    CGFloat subX = nowLocation.x - lastLocation.x;
    if (subX > 0) {
        NSLog(@"向右");
    }else if(subX < 0){
        NSLog(@"向左");
    }else if (subX == 0){
        NSLog(@"垂直");
    }

}

//手指结束滑动时，触发的事件
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"touchesEnded");
}
//手指滑动被中止时
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"touchesCancelled");

}

//当子视图超过自己的frame 是够剪切

        self.clipsToBounds = YES;

3.运动事件

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"开始晃动");
}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"结束晃动");

}

4.事件的传递

iOS——>Application—>window—>子视图

5.响应者链

 
    //取到视图控制器 从responder转过来
//    UIViewController *rootVC = (UIViewController *)self.nextResponder.nextResponder.nextResponder;
    UIViewController *motailVC = [[UIViewController alloc] init];
    motailVC.view.backgroundColor = [UIColor blueColor];
//    [rootVC presentViewController:motailVC animated:YES completion:nil];

//    UIViewController *rootVC = self.viewController;//此处可用点语法点出来
    //弹出模态视图
//    [rootVC presentViewController:motailVC animated:YES completion:nil];
    //导航控制器

    [self.viewController.navigationController pushViewController:motailVC animated:YES];

将核心代码写在UIView的类目中

- (UIViewController *)viewController
{
    //找到视图的下一个响应者
    UIResponder *nextResponder = self.nextResponder;
    //利用循环找到响应者
    do {
        //如果找到的类是视图控制器就跳出
        if ([nextResponder isKindOfClass:[UIViewController class]]) {
            //            break;
            return (UIViewController *)nextResponder;
        }
        //如果不是就继续找
        nextResponder = nextResponder.nextResponder;
       
       
    } while (nextResponder);//如果找到的响应者有值就一直找
   
   
    //找不到返回空
    return nil;

}

6.手势识别器

UIView *gestureView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 300, 300)];
    gestureView.multipleTouchEnabled = YES;
    gestureView.backgroundColor = [UIColor grayColor];
    [self.view addSubview:gestureView];
   
    /**************点击手势*************/
    UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick1:)];
    //设置点击的数量
    tap1.numberOfTapsRequired = 1;
    //设置手指的个数
    tap1.numberOfTouchesRequired = 1;
    //往gestureView上添加手势
    [gestureView addGestureRecognizer:tap1];
    //双击
    UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick2:)];
    tap2.numberOfTapsRequired = 2;
    [gestureView addGestureRecognizer:tap2];
   
    //如果参数中的手势触发了，则自身失效

    [tap1 requireGestureRecognizerToFail:tap2];

//点击手势
- (void)tapClick1:(UITapGestureRecognizer *)tap
{
    NSLog(@"单击");
}
- (void)tapClick2:(UITapGestureRecognizer *)tap
{
    NSLog(@"双击");

}

 /**************轻扫手势*************/
    UISwipeGestureRecognizer *swip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipAction:)];
    //设置方向
    swip.direction = UISwipeGestureRecognizerDirectionDown;
    [gestureView addGestureRecognizer:swip];

    //轻扫手势
- (void)swipAction:(UISwipeGestureRecognizer *)swip
{
    if (swip.direction == UISwipeGestureRecognizerDirectionDown)
    {

        NSLog(@"向下滑动");

    }

   
    /**************平移手势*************/
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];

    [gestureView addGestureRecognizer:pan];

   //平移手势
- (void)panAction:(UIPanGestureRecognizer *)pan
{
    CGPoint p = [pan locationInView:pan.view];
    NSLog(@"%@", NSStringFromCGPoint(p));

}

   
   
     /**************长按手势*************/
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    //最少按住时间
    longPress.minimumPressDuration = 2;

    [gestureView addGestureRecognizer:longPress];

//长按手势
- (void)longPress:(UILongPressGestureRecognizer *)longpress
{
    NSLog(@"长按");

}

   
    /**************旋转手势*************/
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(RotationAction:)];

    [gestureView addGestureRecognizer:rotation];

//旋转手势
- (void)RotationAction:(UIRotationGestureRecognizer *)rotation
{
    //获取旋转的弧度
    CGFloat r = rotation.rotation;
    //弧度转角度
    NSLog(@"%.2f", 180/M_PI * r);

}

   
    /**************捏合手势*************/
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pintchAction:)];

    [gestureView addGestureRecognizer:pinch];

- (void)pintchAction:(UIPinchGestureRecognizer *)pintch
{
    //获得捏合的比例
    CGFloat scale = pintch.scale;
    pintch.view.transform = CGAffineTransformMakeScale(scale, scale);

}