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