NSURLCache

• Framework
  • Foundation
• SDKs
  • iOS 8.0+
  • macOS 10.10+
  • tvOS 9.0+
  • watchOS 2.0+

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It provides a composite in-memory and on-disk cache, and lets you manipulate the sizes of both the in-memory and on-disk portions. You can also control the path where cache data is stored persistently.
提供内存和磁盘缓存，操纵和分配在内存和磁盘的存储大小，你也可以控制存储的路径

在iOS中，当设备的磁盘空间不足时，在磁盘存储的数据将会被清理

线程安全

在iOS8+,macOS10.10+ NSURLCache是线程安全的。

@property(class, strong) NSURLCache *sharedURLCache;

返回NSURLCache实例

- (instancetype)initWithMemoryCapacity:(NSUInteger)memoryCapacity diskCapacity:(NSUInteger)diskCapacity diskPath:(NSString *)path;

初始化NSURLCache指定值,MemoryCapacity与memoryCapacity指定了缓存大小（bytes）diskPath指定磁盘位置

- (NSCachedURLResponse *)cachedResponseForRequest:(NSURLRequest *)request;

返回一个被缓存过的响应请求

- (void)storeCachedResponse:(NSCachedURLResponse *)cachedResponse forRequest:(NSURLRequest *)request;

存储缓存的URL响应的请求。

- (void)getCachedResponseForDataTask:(NSURLSessionDataTask *)dataTask completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler;

No overview available.

- (void)storeCachedResponse:(NSCachedURLResponse *)cachedResponse forDataTask:(NSURLSessionDataTask *)dataTask;

No overview available.

- (void)removeCachedResponseForRequest:(NSURLRequest *)request;

清除缓存

- (void)removeCachedResponseForDataTask:(NSURLSessionDataTask *)dataTask;

No overview available.

- (void)removeCachedResponsesSinceDate:(NSDate *)date;

No overview available. 从什么时间开始清除缓存

- (void)removeAllCachedResponses;

No overview available. 移除所有缓存请求

@property(readonly) NSUInteger currentDiskUsage;

当前存储在磁盘中的存储大小，bytes字段

@property NSUInteger diskCapacity;

磁盘存储容量

@property(readonly) NSUInteger currentMemoryUsage;

当前存储在内存中的存储大小，bytes字段

@property NSUInteger memoryCapacity;

内存中存储容量

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参考文

NSURLCache