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网络热恋之SDWebImage

SDWebImage-master 是一个非常强大的三方。

当需要应用SDWeb时把文件夹里的SDWebImage文件夹放入工程里。

在需要使用网络获取图片的文件里进入头文件#import "UIImageView+WebCache.h"即可使用相应的api。

首先最基本的方法展示（仅获取图片）

 1 #import "ViewController.h"
 2 #import "UIImageView+WebCache.h"
 3 
 4 @interface ViewController ()
 5 
 6 @end
 7 
 8 @implementation ViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];
14     
15     NSURL * url = [NSURL URLWithString:urlString];
16     
17     UIImageView * imageView = [[UIImageView alloc]init];
18     
19     imageView.frame = CGRectMake(0, 20, CGRectGetWidth(self.view.frame), 300);
20     
21     [imageView sd_setImageWithURL:url];
22     
23     [self.view addSubview:imageView];
24     
25 }
26 
27 
28 @end

＊温馨提示：SDWebImage-master可以在github上下载。＊

防止网速差刷不出来图片，会出现留白现象，为此加了占位图片；图片不唯一可以自己配置；

 1 #import "ViewController.h"
 2 #import "UIImageView+WebCache.h"
 3 
 4 @interface ViewController ()
 5 
 6 @end
 7 
 8 @implementation ViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];
14     
15     NSURL * url = [NSURL URLWithString:urlString];
16     
17     UIImageView * imageView = [[UIImageView alloc]init];
18     
19     imageView.frame = CGRectMake(0, 20, CGRectGetWidth(self.view.frame), 300);
20     
21     [imageView sd_setImageWithURL:url placeholderImage:[UIImage imageNamed:@"图片名称"]];
22     
23     [self.view addSubview:imageView];
24     
25 }
26 
27 
28 @end

 1 //
 2 //  ViewController.m
 3 //  CX－SDWebImage-master
 4 //
 5 
 6 #import "ViewController.h"
 7 #import "UIImageView+WebCache.h"
 8 
 9 @interface ViewController ()
10 
11 @end
12 
13 @implementation ViewController
14 
15 - (void)viewDidLoad {
16     [super viewDidLoad];
17     
18     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];
19     
20     NSURL * url = [NSURL URLWithString:urlString];
21     
22     UIImageView * imageView = [[UIImageView alloc]init];
23     
24     imageView.frame = CGRectMake(0, 20, CGRectGetWidth(self.view.frame), 300);
25     
26     [imageView sd_setImageWithURL:url completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
27        
28         NSLog(@"%@",image);
29         //枚举
30         NSLog(@"%ld",(long)cacheType);
31         
32         NSLog(@"%@",imageURL);
33         
34     }];
35     
36     [self.view addSubview:imageView];
37     
38 }
39 /*
40  结果
41  2016-03-18 13:12:18.091 CX－SDWebImage-master[4626:283982] <UIImage: 0x7fe8a3f0d900>, {250, 250}
42  2016-03-18 13:12:18.092 CX－SDWebImage-master[4626:283982] 1
43  2016-03-18 13:12:18.092 CX－SDWebImage-master[4626:283982] http://localhost/tupian.jpg
44  */
45 
46 
47 @end

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原文地址：https://www.cnblogs.com/iOSlearner/p/5381378.html