SDWebImage的图片缓存周期是多长 : 1个星期

SDWebImage下载的图片缓存在沙盒.png

ZYXApp.h
ZYXApp.m
AppDelegate.m

#import "AppDelegate.h"

#import "SDWebImageManager.h"

@implementation AppDelegate

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application{
    // 清除内存缓存
    [[SDWebImageManager sharedManager].imageCache clearMemory];
    // 取消所有下载
    [[SDWebImageManager sharedManager] cancelAll];
}

@end

ViewController.m

#import "ViewController.h"

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

@interface ViewController ()
/** 所有数据 */
@property (nonatomic, strong) NSArray *apps;
@end

@implementation ViewController

- (NSArray *)apps
{
    if (!_apps) {
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"apps.plist" ofType:nil]];
        
        NSMutableArray *appArray = [NSMutableArray array];
        for (NSDictionary *dict in dictArray) {
            [appArray addObject:[ZYXApp appWithDict:dict]];
        }
        _apps = appArray;
    }
    return _apps;
}

#pragma mark - 数据源方法
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return self.apps.count;
}

/**
 * 核心方法
 */
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *ID = @"app";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
    }
    
    ZYXApp *app = self.apps[indexPath.row];
    cell.textLabel.text = app.name;
    cell.detailTextLabel.text = app.download;
    
    /*
    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon]
                      placeholderImage:[UIImage imageNamed:@"placeholder"]];
    */
    
    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon]
                      placeholderImage:[UIImage imageNamed:@"placeholder"]
                               options:0
                              progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                                  // expectedSize: 图片的总字节数
                                  // receivedSize: 已经接收的图片字节数
                                  NSLog(@"下载进度：%f", 1.0 * receivedSize / expectedSize);
                              }
                             completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType,  NSURL *imageURL) {
                                 NSLog(@"下载完图片");
                                 NSLog(@"SDWebImage下载完图片返回的imageURL %@",imageURL);
                             }];
    
    // SDWebImage的图片缓存周期是多长 : 1个星期
    return cell;
}
@end


//2016-08-10 15:32:41.709 SDWebImage[65507:991542] 下载完图片
//2016-08-10 15:32:41.710 SDWebImage[65507:991542] SDWebImage下载完图片返回的imageURL http://p18.qhimg.com/dr/48_48_/t012fea7312194537c2.png

返回图片在远程服务器的URL地址

[[SDWebImageManager sharedManager] downloadImageWithURL:nil
                                                    options:0
                                                   progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                                                   }
                                                  completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
                                                  }];