iOS 点击图片放大效果的实现

今天带来的是图片点击放大效果,这种效果一般在微博,微信朋友圈中比较常见

当我点击其中一张图片时,就会进入详情

具体实现如下

首先创建个 Controller(PhotoViewController)

//
// 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 

然后在 ViewController 中创建四张小图片,添加轻拍手势

//
// 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

这样就可以实现啦........当然这里只是单纯的实现功能,至于想要图片循环什么的还是需要根据需求自行添加..

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