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> 內(nèi)存處理：當(dāng)app接收到內(nèi)存警告時 /*** 當(dāng)app接收到內(nèi)存警告*/ - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {SDWebImageManager *mgr = [SDWebImageManager sharedManager];// 1.取消正在下載的操作[mgr cancelAll];// 2.清除內(nèi)存緩存[mgr.imageCache clearMemory]; }3> SDWebImageOptions * SDWebImageRetryFailed : 下載失敗后，會自動重新下載 * SDWebImageLowPriority : 當(dāng)正在進(jìn)行UI交互時，自動暫停內(nèi)部的一些下載操作 * SDWebImageRetryFailed | SDWebImageLowPriority : 擁有上面2個功能 // // HMAppsViewController.m // 01-cell圖片下載（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 () /*** 所有的應(yīng)用數(shù)據(jù)*/ @property (nonatomic, strong) NSMutableArray *apps; @end@implementation HMAppsViewController#pragma mark - 懶加載 - (NSMutableArray *)apps {if (!_apps) {// 1.加載plistNSString *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.賦值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];// 設(shè)置基本信息cell.textLabel.text = app.name;cell.detailTextLabel.text = app.download;// 下載圖片NSURL *url = [NSURL URLWithString:app.icon];UIImage *placeholder = [UIImage 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(@"----圖片加載完畢---%@", image); // }];SDWebImageOptions options = SDWebImageRetryFailed | SDWebImageLowPriority;[cell.imageView sd_setImageWithURL:url placeholderImage:placeholder options:options progress:^(NSInteger receivedSize, NSInteger expectedSize) { // 這個block可能會被調(diào)用多次NSLog(@"下載進(jìn)度：%f", (double)receivedSize / expectedSize);} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {NSLog(@"----圖片加載完畢---%@", image);}];return cell; } @end

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