UIGestureRecognizer手势识别

UIGestureRecognizer手势识别

UIGestureRecognizer 继承于 NSObject 共有七种手势

即:

1.UIPinchGestureRecognizer (捏合手势)

2.UITapGestureRecognizer (轻拍手势)

3.UIRotationGestureRecognizer (旋转手势)

4.UISwipeGestureRecognizer (轻扫手势)

5.UIPanGestureRecognizer (拖拽手势)

6.UIScreenEdgePanGestureRecognizer (屏幕边缘轻扫手势)

7.UILongPressGestureRecognizer (长按手势)

实现手势步骤

1创建手势对象

UIGestureRecognizer 的 七个子类并没有自身的初始化方法, 所以需要使用父类的 初始化方法,如下

- (instancetype)initWithTarget:(id)target action:(SEL)action

2将手势加在视图上, 注意视图的用户交互属性是否开启

- (void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer/* 创建对象 */

@property(nonatomic, getter=isUserInteractionEnabled) BOOL userInteractionEnabled/* 用户交互属性*/

3内存管理

- (void)release

4设置相关属性

5手势方法实现

实现创建对象 - (instancetype)initWithTarget:(id)target action:(SEL)action

中的 action:(SEL)action

例如

1.UIPinchGestureRecognizer (捏合手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
/* 创建一个UIImageView对象 */
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
imageView.frame = CGRectMake(0, 0, 300, 300);
imageView.center = self.view.center;
imageView.layer.cornerRadius = 50;
imageView.layer.backgroundColor = [UIColor blackColor].CGColor;
imageView.layer.masksToBounds = YES;
[self.view addSubview:imageView];
[imageView release];

/* 创建UIPinchGestureRecognizer对象*/
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[imageView addGestureRecognizer:pinch];
imageView.userInteractionEnabled = YES;/* 默认NO */

[pinch release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)pinchAction:(UIPinchGestureRecognizer *)pinch
{
NSLog(@"捏合");

/* 设置imageView的transform属性
*使用CGAffineTransformScale函数改变比例实现缩放效果
*/
pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
pinch.scale = 1;
}

2.UITapGestureRecognizer (轻拍手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
/* 创建一个UIImageView对象 */
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
imageView.frame = CGRectMake(0, 0, 300, 300);
imageView.center = self.view.center;
imageView.layer.cornerRadius = 50;
imageView.layer.backgroundColor = [UIColor blackColor].CGColor;
imageView.layer.masksToBounds = YES;
[self.view addSubview:imageView];
[imageView release];

/* 创建UITapGestureRecognizer手势对象 */
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];

/* 设置相关属性 */
tap.numberOfTapsRequired = 1;
tap.numberOfTouchesRequired = 1;

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[imageView addGestureRecognizer:tap];
imageView.userInteractionEnabled = YES;/* 默认NO */

[tap release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)tapAction:(UITapGestureRecognizer *)tap
{
NSLog(@"轻拍");
}

3.UIRotationGestureRecognizer (旋转手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
/* 创建一个UIImageView对象 */
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
imageView.frame = CGRectMake(0, 0, 300, 300);
imageView.center = self.view.center;
imageView.layer.cornerRadius = 50;
imageView.layer.backgroundColor = [UIColor blackColor].CGColor;
imageView.layer.masksToBounds = YES;
[self.view addSubview:imageView];
[imageView release];

/* 创建UIRotationGestureRecognizer手势对象 */
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[imageView addGestureRecognizer:rotation];
imageView.userInteractionEnabled = YES;/* 默认NO */

[rotation release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)rotationAction:(UIRotationGestureRecognizer *)rotation
{
NSLog(@"旋转");
NSLog(@"%@", rotation);
/* 设置imageView的transform属性
* 使用 CGAffineTransformRotate 函数
*/
rotation.view.transform = CGAffineTransformRotate(rotation.view.transform, rotation.rotation);
rotation.rotation = 0;
}

4.UISwipeGestureRecognizer (轻扫手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.

/* 创建UISwipeGestureRecognizer手势对象 */
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];

/* 设置相关属性 */
swipe.direction = UISwipeGestureRecognizerDirectionUp;

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[self.view addGestureRecognizer:swipe];

[swipe release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)swipeAction:(UISwipeGestureRecognizer *)swipe
{
NSLog(@"轻扫");
}

5.UIPanGestureRecognizer (拖拽手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
/* 创建一个UIImageView对象 */
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
imageView.frame = CGRectMake(0, 0, 300, 300);
imageView.center = self.view.center;
imageView.layer.cornerRadius = 50;
imageView.layer.backgroundColor = [UIColor blackColor].CGColor;
imageView.layer.masksToBounds = YES;
[self.view addSubview:imageView];
[imageView release];

/* 创建UIPanGestureRecognizer手势对象 */
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[imageView addGestureRecognizer:pan];
imageView.userInteractionEnabled = YES;/* 默认NO */

[pan release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)panAction:(UIPanGestureRecognizer *)pan
{
NSLog(@"拖拽");

/* 设置imageView的transform属性
* 使用 CGAffineTransformTranslate 函数
*/
CGPoint point = [pan translationInView:pan.view];

pan.view.transform = CGAffineTransformTranslate(pan.view.transform, point.x, point.y);

[pan setTranslation:CGPointZero inView:pan.view];

}

6.UIScreenEdgePanGestureRecognizer (屏幕边缘轻扫手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.

/* 创建UIScreenEdgePanGestureRecognizer手势对象 */
UIScreenEdgePanGestureRecognizer *screenEdge = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenAction:)];

/* 设置相关属性 */
screenEdge.edges = 2;

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[self.view addGestureRecognizer:screenEdge];

[screenEdge release];
}

/* 实现action:@selector(pinchAction:)*/
-(void)screenAction:(UIScreenEdgePanGestureRecognizer *)screen
{
NSLog(@"屏幕边缘轻扫");
}

7.UILongPressGestureRecognizer (长按手势)

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
/* 创建一个UIImageView对象 */
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]];
imageView.frame = CGRectMake(0, 0, 300, 300);
imageView.center = self.view.center;
imageView.layer.cornerRadius = 50;
imageView.layer.backgroundColor = [UIColor blackColor].CGColor;
imageView.layer.masksToBounds = YES;
[self.view addSubview:imageView];
[imageView release];

/* 创建UILongPressGestureRecognizer手势对象 */
UILongPressGestureRecognizer *long1 = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];

/* 将手势加在视图上, 注意视图的用户交互属性是否开启 */
[imageView addGestureRecognizer:long1];
imageView.userInteractionEnabled = YES;/* 默认NO */

[long1 release];
}

/* 实现action:@selector(pinchAction:)*/
- (void)longAction:(UILongPressGestureRecognizer *)long1
{
NSLog(@"长按");
}

UIGestureRecognizer手势识别
实现手势步骤
1创建手势对象

2将手势加在视图上 注意视图的用户交互属性是否开启

3内存管理

4设置相关属性

5手势方法实现

例如
UIPinchGestureRecognizer 捏合手势

UITapGestureRecognizer 轻拍手势

UIRotationGestureRecognizer 旋转手势

UISwipeGestureRecognizer 轻扫手势

UIPanGestureRecognizer 拖拽手势

UIScreenEdgePanGestureRecognizer 屏幕边缘轻扫手势

UILongPressGestureRecognizer 长按手势