1，先设置一个属性用来存放缩放数值，可以在 .h 文件中进行：

#import 
    
     @interface ViewController : UIViewController@property (nonatomic)   CGFloat lastScale ;@end
    

2，设置缩放手势代理协议：

#import "ViewController.h"@interface ViewController ()
    
     @property (nonatomic,strong) UIView *viewVC;@end
    

3，添加视图，并将视图添加手势：

@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        UIView *viewVC = [[UIView alloc]initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height - 300)];    self.viewVC = viewVC;        UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height - 300)];    imgView.image = [UIImage imageNamed:@"Kuture"];        UIPinchGestureRecognizer *pinchGes = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(scaGesture:)];    [pinchGes setDelegate:self];    [self.viewVC addGestureRecognizer:pinchGes];            [self.viewVC addSubview:imgView];    [self.view addSubview:self.viewVC];}

4，设置缩放手势的方法实现：

-(void)scaGesture:(id)sender {        [self.view bringSubviewToFront:[(UIPinchGestureRecognizer*)sender view]];            if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {                _lastScale = 1.0;                return;            }                CGFloat scale = 1.0 - (_lastScale - [(UIPinchGestureRecognizer*)sender scale]);        CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;        CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);        [[(UIPinchGestureRecognizer*)sender view]setTransform:newTransform];    //    NSLog(@"Scale:%f LastScale:%f ViewX:%f ViewY:%f ViewW:%f VeiwH:%f",scale,_lastScale,self.viewVC.bounds.origin.x,self.viewVC.bounds.origin.y,self.viewVC.bounds.size.width,self.viewVC.bounds.size.height);        _lastScale = [(UIPinchGestureRecognizer*)sender scale];    }@end

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