利用UIGestureRecognizer來對手勢進行處理：

@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
  {
  // 獲取手指移動的位置
  CGPoint trans = [pan translationInView:_imagView];

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

  // 復位
  [pan setTranslation:CGPointZero inView:_imagView];
  NSLog(@”%@”,NSStringFromCGPoint(trans));

}

warning pinch

• (void)addPinch
  {
  UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
  // 設置代理的原因：想要同時支持多個手勢
  pinch.delegate = self;
  [_imagView addGestureRecognizer:pinch];

}

• (void)pinch:(UIPinchGestureRecognizer *)pinch
  {
  _imagView.transform = CGAffineTransformScale(_imagView.transform, pinch.scale, pinch.scale);

  // 復位
  pinch.scale = 1;
  }

// Simultaneous:同時
// 默認是不支持多個手勢
// 當你使用一個手勢的時候就會調用
- (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);

  // 復位
  rotation.rotation = 0;
  }

warning Swipe

• (void)addSwipe
  {
  // Swipe
  // 一個手勢只能識別一個方向
  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
  {
  // 根據狀態執行事件
  if (longPress.state == UIGestureRecognizerStateBegan) {

  NSLog(@"longPress");

  }
  }

warning tap

• (void)addTap
  {
  // tap
  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
  // 點按多少次才能觸發手勢
  // tap.numberOfTapsRequired = 2;
  //
  // // 必須多少個手指觸摸才能觸發手勢
  // tap.numberOfTouchesRequired = 2;

  tap.delegate = self;

  [_imagView addGestureRecognizer:tap];
  }

// 這個觸摸點能否觸發手勢
//- (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”);
  }

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