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）

 #import "ViewController.h"
 #import "UIImageView+WebCache.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];

     NSURL * url = [NSURL URLWithString:urlString];

     UIImageView * imageView = [[UIImageView alloc]init];

     imageView.frame = CGRectMake(, , CGRectGetWidth(self.view.frame), );

     [imageView sd_setImageWithURL:url];

     [self.view addSubview:imageView];

 }

 @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；

 #import "ViewController.h"
 #import "UIImageView+WebCache.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];

     NSURL * url = [NSURL URLWithString:urlString];

     UIImageView * imageView = [[UIImageView alloc]init];

     imageView.frame = CGRectMake(, , CGRectGetWidth(self.view.frame), );

     [imageView sd_setImageWithURL:url placeholderImage:[UIImage imageNamed:@"图片名称"]];

     [self.view addSubview:imageView];

 }

 @end

 //
 //  ViewController.m
 //  CX－SDWebImage-master
 //

 #import "ViewController.h"
 #import "UIImageView+WebCache.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     NSString * urlString = [NSString stringWithFormat:@"http://localhost/tupian.jpg"];

     NSURL * url = [NSURL URLWithString:urlString];

     UIImageView * imageView = [[UIImageView alloc]init];

     imageView.frame = CGRectMake(, , CGRectGetWidth(self.view.frame), );

     [imageView sd_setImageWithURL:url completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {

         NSLog(@"%@",image);
         //枚举
         NSLog(@"%ld",(long)cacheType);

         NSLog(@"%@",imageURL);

     }];

     [self.view addSubview:imageView];

 }
 /*
  结果
  2016-03-18 13:12:18.091 CX－SDWebImage-master[4626:283982] <UIImage: 0x7fe8a3f0d900>, {250, 250}
  2016-03-18 13:12:18.092 CX－SDWebImage-master[4626:283982] 1
  2016-03-18 13:12:18.092 CX－SDWebImage-master[4626:283982] http://localhost/tupian.jpg
  */

 @end