iOS 六种手势

最新推荐文章于 2023-04-13 21:34:42 发布

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最新推荐文章于 2023-04-13 21:34:42 发布

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分类专栏： iOS 文章标签： iOS GestureRecognizer

本文链接：https://blog.youkuaiyun.com/evil_ice/article/details/49486689

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本文详细介绍了iOS开发中常用的六种手势识别器的实现方法，包括点击、拖动、旋转、缩放、滑动及长按手势。每种手势通过具体的代码示例展示了如何设置手势识别器并处理相应的手势事件。

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1.点击手势

-(void)testTap{

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dealTap:)];

[_imageView addGestureRecognizer:tap];

}

-(void)dealTap:(UITapGestureRecognizer *)tap{

CGPoint point = [tap locationInView:_imageView];

NSLog(@"x=%f y=%f",point.x,point.y);

}

2.拖动手势

-(void)testPan{

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dealPan:)];

[_imageView addGestureRecognizer:pan];

}

-(void)dealPan:(UIPanGestureRecognizer *)pan{

if (pan.state == UIGestureRecognizerStateBegan) {

_startPoint = _imageView.center;

}

// locationInView和translationInView的区别

// 1 translationInView是UIPanGestureRecognizer下面的一个属性

// locationInView则是UIGestureRecognizer下面的属性

// 2 translationInView 在指定的坐标系中移动

// locationInView 通常是指单点位置的手势得到当前点击下在指定视图中位置的坐标

if (pan.state == UIGestureRecognizerStateChanged) {

CGPoint offset = [pan translationInView:self.view];

_imageView.center = CGPointMake(_startPoint.x+offset.x, _startPoint.y+offset.y);

}

3.旋转手势

-(void)testRotation{

UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(dealRotation:)];

[_imageView addGestureRecognizer:rotation];

}

-(void)dealRotation:(UIRotationGestureRecognizer *)rotation{

double r = rotation.rotation;

_imageView.transform = CGAffineTransformMakeRotation(r);

}

4.缩放手势

-(void)testPinch{

UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(dealPinch:)];

[_imageView addGestureRecognizer:pinch];

}

-(void)dealPinch:(UIPinchGestureRecognizer *)pinch{

double scale = pinch.scale;

_imageView.transform = CGAffineTransformMakeScale(scale, scale);

}

5.滑动手势

-(void)testSwipe{

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(dealSwipe:)];

swipe.direction = UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight;

[_imageView addGestureRecognizer:swipe];

}

-(void)dealSwipe:(UISwipeGestureRecognizer *)swipe{

_index ++;

if (_index == _images.count) {

_index = 0;

}

_imageView.image = [UIImage imageNamed:_images[_index]];

}

6.长按手势

-(void)testLongPress

{

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(dealLongPress:)];

[_imageView addGestureRecognizer:longPress];

}

-(void)dealLongPress:(UILongPressGestureRecognizer *)longPress

{

NSLog(@"longPress");//这句话会被打印两边

//注意: 这个事件处理方法会执行两次

if (longPress.state == UIGestureRecognizerStateBegan)

{

UIAlertView *alertView = [[UIAlertView alloc] init];

alertView.message = @"真的要保存吗";

[alertView addButtonWithTitle:@"确定"];

[alertView show];

}