YYCache 源码分析(一)

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iOS 开发中总会用到各种缓存，YYCache或许是你最好的选择。性能上有优势，用法也很简单。作者`ibireme`曾经对比过同类轮子：http://blog.ibireme.com/2015/10/26/yycache/

1.简单架构图

2.YYCache.h方法分析

@interface YYCache : NSObject

// 读取当前数据库名称

@property (copy, readonly) NSString *name;

// memoryCache内存缓存，diskCache文件缓存

@property (strong, readonly) YYMemoryCache *memoryCache;

@property (strong, readonly) YYDiskCache *diskCache;

// 可通过下面三种方法来实例化YYCache对象

- (nullable instancetype)initWithName:(NSString *)name;

- (nullable instancetype)initWithPath:(NSString *)path NS_DESIGNATED_INITIALIZER;

+ (nullable instancetype)cacheWithPath:(NSString *)path;

// 禁止通过下面两个方式实例化对象

- (instancetype)init UNAVAILABLE_ATTRIBUTE;

+ (instancetype)new __attribute__((unavailable("new方法不可用，请用initWithName:")));

// 通过key判断是否缓存了某个东西，第二个法是异步执行,异步回调

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

- (void)containsObjectForKey:(NSString *)key withBlock:(nullable void(^)(NSString *key, BOOL contains))block;

// 读--通过key读取缓存，第二个法是异步执行,异步回调

- (nullable id<NSCoding>)objectForKey:(NSString *)key;

- (void)objectForKey:(NSString *)key withBlock:(nullable void(^)(NSString *key, id<NSCoding> object))block;

// 增、改--缓存对象(可缓存遵从NSCoding协议的对象)，第二个法是异步执行,异步回调

- (void)setObject:(nullable id<NSCoding>)object forKey:(NSString *)key;

- (void)setObject:(nullable id<NSCoding>)object forKey:(NSString *)key withBlock:(nullable void(^)(void))block;

// 删--删除缓存

- (void)removeObjectForKey:(NSString *)key;

- (void)removeObjectForKey:(NSString *)key withBlock:(nullable void(^)(NSString *key))block;

- (void)removeAllObjects;

- (void)removeAllObjectsWithBlock:(void(^)(void))block;

- (void)removeAllObjectsWithProgressBlock:(nullable void(^)(int removedCount, int totalCount))progress

endBlock:(nullable void(^)(BOOL error))end;

@end

3.YYCache使用

// 0.初始化YYCache

YYCache *cache = [YYCache cacheWithName:@"mydb"];

// 1.缓存普通字符

[cache setObject:@"汉斯哈哈哈" forKey:@"name"];

NSString *name = (NSString *)[cache objectForKey:@"name"];

NSLog(@"name: %@", name);

// 2.缓存模型

[cache setObject:(id<NSCoding>)model forKeybireme.com/2015/10/26/yycache/