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(0, 20, CGRectGetWidth(self.view.frame), 300);
    
    [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(0, 20, CGRectGetWidth(self.view.frame), 300);
    
    [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(0, 20, CGRectGetWidth(self.view.frame), 300);
    
    [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