多线程06-（sdwebimage 总结3）

2.SDWebImage
1> 常用方法
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder;
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options;
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder completed:(SDWebImageCompletionBlock)completedBlock;
- (void)sd_setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options progress:(SDWebImageDownloaderProgressBlock)progressBlock completed:(SDWebImageCompletionBlock)completedBlock;

2> 内存处理：当app接收到内存警告时
/**
*  当app接收到内存警告
*/
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
SDWebImageManager *mgr = [SDWebImageManager sharedManager];

// 1.取消正在下载的操作
[mgr cancelAll];

// 2.清除内存缓存
[mgr.imageCache clearMemory];
}

3> SDWebImageOptions
* SDWebImageRetryFailed : 下载失败后，会自动重新下载
* SDWebImageLowPriority : 当正在进行UI交互时，自动暂停内部的一些下载操作
* SDWebImageRetryFailed | SDWebImageLowPriority : 拥有上面2个功能

//
//  HMAppsViewController.m
//  01-cell图片下载（了解）
//
//  Created by apple on 14-9-18.
//  Copyright (c) 2014年 heima. All rights reserved.
//

#import "HMAppsViewController.h"
#import "HMApp.h"
#import "UIImageView+WebCache.h"

@interface HMAppsViewController ()
/**
*  所有的应用数据
*/
@property (nonatomic, strong) NSMutableArray *apps;
@end

@implementation HMAppsViewController

#pragma mark - 懒加载
- (NSMutableArray *)apps
{
if (!_apps) {
// 1.加载plist
NSString *file = [[NSBundle mainBundle] pathForResource:@"apps" ofType:@"plist"];
NSArray *dictArray = [NSArray arrayWithContentsOfFile:file];

// 2.字典 --> 模型
NSMutableArray *appArray = [NSMutableArray array];
for (NSDictionary *dict in dictArray) {
HMApp *app = [HMApp appWithDict:dict];
[appArray addObject:app];
}

// 3.赋值
self.apps = appArray;
//        _apps = appArray;
}
return _apps;
}

#pragma mark - 初始化方法
- (void)viewDidLoad
{
[super viewDidLoad];

}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];

}

#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.apps.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *ID = @"app";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
}

// 取出模型
HMApp *app = self.apps[indexPath.row];

// 设置基本信息
cell.textLabel.text = app.name;
cell.detailTextLabel.text = app.download;

// 下载图片
NSURL *url = [NSURL URLWithString:app.icon];
UIImage *placeholder = [U
4000
IImage imageNamed:@"placeholder"];
//    [cell.imageView sd_setImageWithURL:url placeholderImage:placeholder];

//    [cell.imageView sd_setImageWithURL:url placeholderImage:placeholder completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
//        NSLog(@"----图片加载完毕---%@", image);
//    }];

SDWebImageOptions options = SDWebImageRetryFailed | SDWebImageLowPriority;
[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder options:options progress:^(NSInteger receivedSize, NSInteger expectedSize) { // 这个block可能会被调用多次
NSLog(@"下载进度：%f", (double)receivedSize / expectedSize);
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
NSLog(@"----图片加载完毕---%@", image);
}];
return cell;
}
@end