- setItem:(CustomItem *)item

{

_item?=?item;

//?占位圖片

UIImage?*placeholder?=?[UIImage?imageNamed:@"placeholderImage"];

//?從內(nèi)存\沙盒緩存中獲得原圖

UIImage?*originalImage?=?[[SDImageCache?sharedImageCache]?imageFromDiskCacheForKey:item.originalImage];

if(originalImage)?{//?如果內(nèi)存\沙盒緩存有原圖，那么就直接顯示原圖（不管現(xiàn)在是什么網(wǎng)絡狀態(tài)）

[self.imageView?sd_setImageWithURL:[NSURL?URLWithString:item.originalImage]?placeholderImage:placeholder];

}else{//?內(nèi)存\沙盒緩存沒有原圖

AFNetworkReachabilityManager?*mgr?=?[AFNetworkReachabilityManager?sharedManager];

if(mgr.isReachableViaWiFi)?{//?在使用Wifi,?下載原圖

[self.imageView?sd_setImageWithURL:[NSURL?URLWithString:item.originalImage]?placeholderImage:placeholder];

}elseif(mgr.isReachableViaWWAN)?{//?在使用手機自帶網(wǎng)絡

//?????用戶的配置項假設(shè)利用NSUserDefaults存儲到了沙盒中

//????[[NSUserDefaults?standardUserDefaults]?setBool:NO?forKey:@"alwaysDownloadOriginalImage"];

//????[[NSUserDefaults?standardUserDefaults]?synchronize];

#warning?從沙盒中讀取用戶的配置項：在3G\4G環(huán)境是否仍然下載原圖

BOOL?alwaysDownloadOriginalImage?=?[[NSUserDefaults?standardUserDefaults]?boolForKey:@"alwaysDownloadOriginalImage"];

if(alwaysDownloadOriginalImage)?{//?下載原圖

[self.imageView?sd_setImageWithURL:[NSURL?URLWithString:item.originalImage]?placeholderImage:placeholder];

}else{//?下載小圖

[self.imageView?sd_setImageWithURL:[NSURL?URLWithString:item.thumbnailImage]?placeholderImage:placeholder];

}

}else{//?沒有網(wǎng)絡

UIImage?*thumbnailImage?=?[[SDImageCache?sharedImageCache]?imageFromDiskCacheForKey:item.thumbnailImage];

if(thumbnailImage)?{//?內(nèi)存\沙盒緩存中有小圖

[self.imageView?sd_setImageWithURL:[NSURL?URLWithString:item.thumbnailImage]?placeholderImage:placeholder];

}else{

[self.imageView?sd_setImageWithURL:nil?placeholderImage:placeholder];

}

}

}

}