#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageV;

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  self.imageV.userInteractionEnabled = YES;

  //添加旋转手势
  [self rotationGes];

  //添加捏合手势
  [self pinch];

}

//Simultaneous:同时
//是否允许同时支持多个手势
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

return YES;  

}

//添加旋转手势

• (void)rotationGes{
  //添加旋转手势
  UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGes:)];

  rotation.delegate = self;

  [self.imageV addGestureRecognizer:rotation];
  }

• (void)rotationGes:(UIRotationGestureRecognizer *)rotationGes{

  self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotationGes.rotation);

  //复位
  [rotationGes setRotation:];

}

//添加捏合手势

• (void)pinch{

  UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
  pinch.delegate = self;
  [self.imageV addGestureRecognizer:pinch];
  }

//当缩放时调用

• (void)pinch:(UIPinchGestureRecognizer *)pinch{
  NSLog(@"%s",__func__);
  self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pinch.scale,pinch.scale );

  //复位
  [pinch setScale:];
  }

• (void)panGes{
  //添加拖动手势
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
  [self.imageV addGestureRecognizer:pan];
  }

//当拖动View时调用

• (void)pan:(UIPanGestureRecognizer *)pan {

  //获取偏移量(相对于最原始的偏移量)
  CGPoint transP = [pan translationInView:self.imageV];
  NSLog(@"%@",NSStringFromCGPoint(transP));

  self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform, transP.x, transP.y);

  //让它相对于上一次
  //复位.
  [pan setTranslation:CGPointZero inView:self.imageV];

}

@end