上个项目的一些反思 II

//
//  SingletonCache.h
//  StorageDemo
//
//  Created by M on 16/1/15.
//  Copyright © 2016年 Meng. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface SingletonCache : NSObject

+(SingletonCache *)sharedManager;
-(id)ReadWithKey:(NSString*)Key;
-(void)LoadWithData:(id)data WithKey:(NSString*) Key;
-(void)removeCacheWithKey:(NSString*)Key;
-(void)removeAllCache;

@end

//
//  SingletonCache.m
//  StorageDemo
//
//  Created by M on 16/1/15.
//  Copyright © 2016年 Meng. All rights reserved.
//

#import "SingletonCache.h"

@interface SingletonCache ()<NSCacheDelegate>

@property(nonatomic,strong)NSCache *cache;

@end

@implementation SingletonCache

+(SingletonCache *)sharedManager
{
    static SingletonCache *SingletonCacheInstance = nil;
    static dispatch_once_t predicate;
    
    
    dispatch_once(&predicate, ^{
        SingletonCacheInstance = [[self alloc] init];
    
        
    });
    return SingletonCacheInstance;
}

/*
    可实现 NSCacheDelegate 协议
 
    - (void)cache:(NSCache *)cache willEvictObject:(id)obj;
 
    在系统自动清除缓存的回调,
 */

-(id)init
{
    if (self = [super init]) {
        
        _cache = [[NSCache alloc] init];
//        _cache.countLimit = 50; 限制缓存中对象数量
        _cache.delegate = self;
        
    }
    
    return self;
}

-(id)ReadWithKey:(NSString*)Key
{
    return [_cache objectForKey:Key];
}

-(void)LoadWithData:(id)data WithKey:(NSString*) Key
{
     [_cache setObject:data forKey:Key];
}

-(void)removeCacheWithKey:(NSString*)Key
{
    
    [_cache removeObjectForKey:Key];
    
}

-(void)removeAllCache
{
    [_cache removeAllObjects];
}


- (void)cache:(NSCache *)cache willEvictObject:(id)obj
{

    NSLog(@"Clean:%@",obj);
}

@end