iOS 手势识别 旋转和缩放(捏合)

#import "MJViewController.h"@interface MJViewController () <UIGestureRecognizerDelegate>@property (weak, nonatomic) IBOutlet UIImageView *iconView;@end@implementation MJViewController- (void)viewDidLoad{    [super viewDidLoad];        [self testPinchAndRotate];}#pragma mark - 手势识别器的代理方法/** *  是否允许多个手势识别器同时有效 *  Simultaneously : 同时地 */- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{    return YES;}#pragma mark - 缩放 + 旋转- (void)testPinchAndRotate{    [self testPinch];    [self testRotate];}#pragma mark - 缩放手势(捏合手势)- (void)testPinch{    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];    pinch.delegate = self;    [self.iconView addGestureRecognizer:pinch];}- (void)pinchView:(UIPinchGestureRecognizer *)pinch{    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);    pinch.scale = 1; // 这个真的很重要!!!!!}#pragma mark - 旋转手势- (void)testRotate{    UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];    recognizer.delegate = self;    [self.iconView addGestureRecognizer:recognizer];}- (void)rotateView:(UIRotationGestureRecognizer *)recognizer{    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);    recognizer.rotation = 0; // 这个很重要!!!!!}@end