SDWebImage下载图片

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<pre name="code" class="objc">// 显示图片//    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon] placeholderImage:[UIImage imageNamed:@"user_default"]];        // 另外下载图像的方法    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon] placeholderImage:[UIImage imageNamed:@"user_default"] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {        // receivedSize 已经接受到的大小        // expectedSize 期望的大小，总大小        float progress = (float)receivedSize/expectedSize;        NSLog(@"下载进度 %f", progress);            } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {        NSLog(@"%@", [NSThread currentThread]);    }];

////  ViewController.m////#import "ViewController.h"#import "CZApp.h"#import "UIImageView+WebCache.h"@interface ViewController ()// plist文件数据的容器@property(nonatomic,strong)NSArray *appList;@end@implementation ViewController// 懒加载- (NSArray *)appList{    if (_appList == nil) {        NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"apps.plist" ofType:nil]];                // 字典转模型        NSMutableArray *arrayM = [NSMutableArray array];        for (NSDictionary *dict in dictArray) {            CZApp *app = [CZApp appWithDict:dict];            [arrayM addObject:app];        }        _appList = arrayM;    }    return _appList;}#pragma mark - 数据源方法- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return self.appList.count;}/** 问题1: 如果网络比较慢，会比较卡 解决办法：用异步下载 */// cell里面的imageView子控件也是懒加载。- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *ID = @"AppCell";        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];        // 给cell设置数据    CZApp *app = self.appList[indexPath.row];        cell.textLabel.text = app.name;    cell.detailTextLabel.text = app.download;        // 显示图片//    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon] placeholderImage:[UIImage imageNamed:@"user_default"]];        // 另外下载图像的方法    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:app.icon] placeholderImage:[UIImage imageNamed:@"user_default"] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {        // receivedSize 已经接受到的大小        // expectedSize 期望的大小，总大小        float progress = (float)receivedSize/expectedSize;        NSLog(@"下载进度 %f", progress);            } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {        NSLog(@"%@", [NSThread currentThread]);    }];            return cell;}@end

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