為什么80%的碼農都做不了架構師？>>> ??

1，先設置一個屬性用來存放縮放數值，可以在 .h 文件中進行：

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@property (nonatomic) CGFloat lastScale ; @end

2，設置縮放手勢代理協議：

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

3，添加視圖，并將視圖添加手勢：

@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，設置縮放手勢的方法實現：

-(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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轉載于:https://my.oschina.net/Kuture/blog/690029

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