iOS手势操作简介（六）

利用UIGestureRecognizer来对手势进行处理：

@interface HMViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *imagView;

@end

@implementation HMViewController

(void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

// pan

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

[_imagView addGestureRecognizer:pan];

}

(void)pan:(UIPanGestureRecognizer *)pan

{

// 获取手指移动的位置

CGPoint trans = [pan translationInView:_imagView];

_imagView.transform = CGAffineTransformTranslate(_imagView.transform, trans.x, trans.y);

// 复位

[pan setTranslation:CGPointZero inView:_imagView];

NSLog(@”%@”,NSStringFromCGPoint(trans));

}

warning pinch

(void)addPinch

{

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

// 设置代理的原因：想要同时支持多个手势

pinch.delegate = self;

[_imagView addGestureRecognizer:pinch];

}

(void)pinch:(UIPinchGestureRecognizer *)pinch

{

_imagView.transform = CGAffineTransformScale(_imagView.transform, pinch.scale, pinch.scale);

// 复位

pinch.scale = 1;

}

// Simultaneous:同时

// 默认是不支持多个手势

// 当你使用一个手势的时候就会调用

- (BOOL)gestureRecognizer:(UIGestureRecognizer )gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer )otherGestureRecognizer

{

return YES;

}

warning rotation

(void)addRotation

{

// rotation

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

rotation.delegate = self;

[_imagView addGestureRecognizer:rotation];

}

(void)rotation:(UIRotationGestureRecognizer *)rotation

{

NSLog(@”%f”,rotation.rotation);

// _imagView.transform = CGAffineTransformMakeRotation(rotation.rotation);

_imagView.transform = CGAffineTransformRotate(_imagView.transform, rotation.rotation);

// 复位

rotation.rotation = 0;

}

warning Swipe

(void)addSwipe

{

// Swipe

// 一个手势只能识别一个方向

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

swipe.direction = UISwipeGestureRecognizerDirectionRight;

[_imagView addGestureRecognizer:swipe];

}

(void)swipe:(UISwipeGestureRecognizer *)swipe

{

NSLog(@”swipe”);

}

warning longPress

(void)addLongPress

{

// longPress

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

[_imagView addGestureRecognizer:longPress];

}

(void)longPress:(UILongPressGestureRecognizer *)longPress

{

// 根据状态执行事件

if (longPress.state == UIGestureRecognizerStateBegan) {

NSLog(@"longPress");

}

}

warning tap

(void)addTap

{

// tap

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

// 点按多少次才能触发手势

// tap.numberOfTapsRequired = 2;

//

// // 必须多少个手指触摸才能触发手势

// tap.numberOfTouchesRequired = 2;

tap.delegate = self;

[_imagView addGestureRecognizer:tap];

}

// 这个触摸点能否触发手势

//- (BOOL)gestureRecognizer:(UIGestureRecognizer )gestureRecognizer shouldReceiveTouch:(UITouch )touch

//{

// CGPoint currentPoint = [touch locationInView:_imagView];

//

// if (currentPoint.x < _imagView.bounds.size.width * 0.5) {

// return NO;

// }else{

//

// return YES;

// }

//}

(void)tap:(UITapGestureRecognizer *)tap

{

NSLog(@”tap”);

}