iOS 点击图片放大效果的实现

// // PhotoViewController.h // 点击图片放大效果 // // Created by Amydom on 17/1/9. // Copyright © 2017年 Amydom. All rights reserved. //  #import <UIKit/UIKit.h>  @interface PhotoViewController : UIViewController  //保存图片的数组 @property (nonatomic, strong)NSMutableArray *photoArr; //图片 tag @property (nonatomic, assign)NSInteger imageTag;  @end 

// // PhotoViewController.m // 点击图片放大效果 // // Created by Amydom on 17/1/9. // Copyright © 2017年 Amydom. All rights reserved. //  #import "PhotoViewController.h"  @interface PhotoViewController ()  @end  @implementation PhotoViewController  - (void)viewDidLoad {   [super viewDidLoad];      UIScrollView *myScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 375, 667)];      myScrollView.backgroundColor = [UIColor blackColor];   myScrollView.pagingEnabled = YES;   myScrollView.bounces = NO;      [self.view addSubview:myScrollView];   //根据tag 来获取当前点击的图片   myScrollView.contentOffset = CGPointMake(self.view.frame.size.width * self.imageTag, 10);      myScrollView.contentSize = CGSizeMake(self.view.frame.size.width * self.photoArr.count, 667);   //创建   for (int i = 0; i < self.photoArr.count; i++)   {     UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width * i + 10, 0, self.view.frame.size.width - 20, self.view.frame.size.height)];     NSString *imgName = self.photoArr[i];     img.image = [UIImage imageNamed:imgName];          [myScrollView addSubview:img];          //自适应图片大小     img.contentMode = UIViewContentModeScaleAspectFit;        }      //轻拍跳出照片浏览   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction)];      [myScrollView addGestureRecognizer:tap];  }  - (void)tapAction {   [self dismissViewControllerAnimated:YES completion:^{             }]; }  - (void)didReceiveMemoryWarning {   [super didReceiveMemoryWarning];   // Dispose of any resources that can be recreated. }  /* #pragma mark - Navigation  // In a storyboard-based application, you will often want to do a little preparation before navigation - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {   // Get the new view controller using [segue destinationViewController].   // Pass the selected object to the new view controller. } */  @end 

// // ViewController.m // 点击图片放大效果 // // Created by Amydom on 17/1/9. // Copyright © 2017年 Amydom. All rights reserved. //  #import "ViewController.h" #import "PhotoViewController.h"  @interface ViewController (){      NSMutableArray *array;    }  @end  @implementation ViewController  - (void)viewDidLoad {   [super viewDidLoad];   self.view.backgroundColor = [UIColor whiteColor];   array = [NSMutableArray arrayWithObjects:@"1.jpg", @"2.jpg",@"3.jpg",@"4.jpg", nil nil];   for (int i = 0; i < array.count; i++) {          UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(20 + 880 * i, 100, 70, 70)];     img.image = [UIImage imageNamed:[array objectAtIndex:i]];          img.userInteractionEnabled = YES;          //截掉边框     img.clipsToBounds = YES;          img.tag = 1000 + i;          UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(TapAction:)];          [img addGestureRecognizer:tap];          [self.view addSubview:img];   }  }  - (void)TapAction:(UITapGestureRecognizer *)tap{      PhotoViewController *photoVC = [[PhotoViewController alloc] init];   photoVC.imageTag = tap.view.tag - 1000 ;//获取当前被点击图片的 tag   photoVC.photoArr = array;   [photoVC setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];// 效果   [self presentModalViewController:photoVC animated:YES];    } - (void)didReceiveMemoryWarning {   [super didReceiveMemoryWarning];   // Dispose of any resources that can be recreated. }   @end