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