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;
// }
//}