SDWebImage系列一（常用好用方法）

一.SDWebImageManager

*1.本地内存是否存在

- (BOOL)cachedImageExistsForURL:(NSURL *)url;

*2.本地磁盘中是否存在

- (BOOL)diskImageExistsForURL:(NSURL *)url;

*3.判断是否存在于内存 然后执行操作

- (void)cachedImageExistsForURL:(NSURL *)url
                     completion:(SDWebImageCheckCacheCompletionBlock)completionBlock;

*4.判断是否存在于磁盘 然后执行操作

- (void)diskImageExistsForURL:(NSURL *)url
                   completion:(SDWebImageCheckCacheCompletionBlock)completionBlock;

*5.暂时不清楚以后补

- (NSString *)cacheKeyForURL:(NSURL *)url;

二.SDImageCache

*1.memory image cache 内存中像素点

@property (assign, nonatomic) NSUInteger maxMemoryCost;

*2.最多多少个文件

@property (assign, nonatomic) NSUInteger maxMemoryCountLimit;

*3.在内存中呆多少秒

@property (assign, nonatomic) NSInteger maxCacheAge;

*4.最多多少个字节

@property (assign, nonatomic) NSUInteger maxCacheSize;

*5.用一个键值存储已有image

- (void)storeImage:(UIImage *)image forKey:(NSString *)key;    

- (void)storeImageDataToDisk:(NSData *)imageData forKey:(NSString *)key;

*6.根据键值获取image

- (UIImage *)imageFromMemoryCacheForKey:(NSString *)key;

- (UIImage *)imageFromDiskCacheForKey:(NSString *)key;

*7.根据键值对删除图片
*8.删除全部内存中图片

- (void)clearMemory;

*9.删除全部磁盘中图片

- (void)clearDisk;

*10.获取缓存中大小

- (NSUInteger)getSize;

- (NSUInteger)getDiskCount;

*11.硬盘中是否存在

- (BOOL)diskImageExistsWithKey:(NSString *)key;

疑惑 operation cache Disk Download