上个项目的一些反思 II

上个项目需要使用通讯录,我在回顾自己设计的时候,发现自己少设计了cache这一环.

虽然直接用SQLite在初期体验上没什么大损失,不过可以预想通讯录增长到一定数量后势必会影响体验.

单例模式,全局缓存...

//

//  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