iOS如何实现点击图片放大的效果

时间：2022-06-25 23:32:08 编辑：袖梨来源：一聚教程网

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.

#import

@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.

#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(inti = 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.

#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(inti = 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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