UI各种手势（轻拍，长按，旋转，捏合，清扫，拖拽）

最新推荐文章于 2019-09-05 13:53:00 发布

liulala16

最新推荐文章于 2019-09-05 13:53:00 发布

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CC 4.0 BY-SA版权

分类专栏： UI

本文链接：https://blog.youkuaiyun.com/liulala16/article/details/8279833

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本文介绍了一个使用Objective-C实现的手势识别系统，通过不同类型的触摸屏手势（如轻拍、长按、旋转等）来控制屏幕上的图片变化。文章详细展示了如何设置手势识别器并为每个手势定义相应的响应行为。

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-(void)loadView

{

self.view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)];

self.view.backgroundColor = [UIColor redColor];

imageV = [[UIImageView alloc]initWithFrame:CGRectMake(70, 150, 200, 200)];

imageV.backgroundColor = [UIColor blueColor];

[self.view addSubview:imageV];

[imageV release];

NSArray *arr = [NSArray arrayWithObjects:@"轻拍",@"长按",@"旋转",@"捏合",@"轻扫",@"拖拽", nil];

UISegmentedControl *seg = [[UISegmentedControl alloc]initWithItems:arr];

[seg addTarget:self action:@selector(tap:) forControlEvents:UIControlEventValueChanged];

seg.frame = CGRectMake(0, 400, 320, 40);

imageV.userInteractionEnabled = YES;

[self.view addSubview:seg];

}

-(void)tap:(UISegmentedControl *)tap

{

for(id gesture in imageV.gestureRecognizers)

{

[imageV removeGestureRecognizer:gesture];

}

switch (tap.selectedSegmentIndex)

{

case 0:

{

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

[imageV addGestureRecognizer:tap];

imageV.userInteractionEnabled = YES;

[tap release];

break;

}

case 1:

{

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

[imageV addGestureRecognizer:longPress];

[longPress release];

break;

}

case 2:

{

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

[imageV addGestureRecognizer:rotationPress];

[rotationPress release];

break;

}

case 3:

{

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

[imageV addGestureRecognizer:pinchPress];

[pinchPress release];

break;

}

case 4:

{

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

[imageV addGestureRecognizer:swipePress];

[swipePress release];

UISwipeGestureRecognizer *swipePress1 = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipePress:)];

[imageV addGestureRecognizer:swipePress1];

swipePress.direction = UISwipeGestureRecognizerDirectionLeft ;

[swipePress1 release];

break;

}

case 5:

{

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

[imageV addGestureRecognizer:panPress];

[panPress release];

break;

}

default:

break;

}

-(void)dotap:(UITapGestureRecognizer *)dotap//轻按随机换图

{

NSString *imageName = [NSString stringWithFormat:@"h%d.jpeg",arc4random()%8+1];

imageV.image = [UIImage imageNamed:imageName];

}

-(void)longPress:(UILongPressGestureRecognizer *)longPress//长按按顺序换图

{

if(longPress.state == UIGestureRecognizerStateEnded)

{

NSString *imageName = [NSString stringWithFormat:@"h%d.jpeg",i%8+1] ;

imageV.image = [UIImage imageNamed:imageName];

i = i+1;

}

-(void)rotationPress:(UIRotationGestureRecognizer *)rotationPress//旋转

{

[imageV setTransform:CGAffineTransformMakeRotation(rotationPress.rotation)];

}

-(void)pinchPress:(UIPinchGestureRecognizer *)pinchPress//捏合

{

[imageV setTransform:CGAffineTransformMakeScale(pinchPress.scale, pinchPress.scale)];

}

-(void)swipePress:(UISwipeGestureRecognizer *)swipePress//轻扫

{

[UIView beginAnimations:nil context:nil];

[UIView setAnimationTransition:(swipePress.direction == UISwipeGestureRecognizerDirectionLeft )?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRight forView:imageV cache:YES];

[UIView commitAnimations];

}

-(void)panPress:(UIPanGestureRecognizer *)panPress //拖拽

{

CGPoint point =[panPress translationInView:imageV];

imageV.transform = CGAffineTransformMakeTranslation(point.x, point.y);

}