iOS缓存

1.SDImageCache缓存

@property (nonatomic,strong)SDImageCache * houseImageCache;
[_houseImageCache storeImage:imgBig imageData:imgBigData forKey:imagePathBig toDisk:YES];

 2.清除缓存

[[SDImageCache sharedImageCache] clearDisk];
[[SDImageCache sharedImageCache] clearMemory];