FWCacheKeychain
@interface FWCacheKeychain : FWCacheEngine
Keychain缓存
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单例模式
Declaration
Objective-C
@property (class, nonatomic, readonly) FWCacheKeychain *_Nonnull sharedInstance;
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分组对象
Declaration
Objective-C
- (nonnull instancetype)initWithGroup:(nullable NSString *)group;