IOS use of the cache class NSCache

First, to achieve cache delegate class <NSCacheDelegate>
@Property (nonatomic, strong) NSCache * Cache;

Initialize cache class NSCache

- (NSCache *) Cache {
    IF (_cache == nil) {
        _cache = [[NSCache the alloc] the init];
        // cache can store a total of how many
        _cache.countLimit =. 5;
    }
    return _cache;
}

Then set the delegate, to which added data NSCache

 
    // add the cache data
    for (int I = 0; I <10; I ++) {
        [in self.cache the setObject: [NSString stringWithFormat: @ "% D Hello", I] forKey: [NSString stringWithFormat: @ "% D H" , I]];
        NSLog (@ "Add% @", [NSString stringWithFormat: @ "Hello% D", I]);
    }
    
    // the output buffer data
    for (int i = 0; i <10; i ++) {
        NSLog (@ "% @", [in self.cache objectForKey: [NSString stringWithFormat: @ "% D H", I]]);
    }

// remove the one from NSCache when executed
- (void) Cache: (NSCache *) Cache willEvictObject: (ID) {obj
    NSLog (@ "% @ removed from cache", obj);
}

 

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self.cache removeAllObjects];
    
    //添加缓存数据
    for (int i = 0; i < 10; i++) {
        [self.cache setObject:[NSString stringWithFormat:@"hello %d",i] forKey:[NSString stringWithFormat:@"h%d",i]];
//        NSLog(@"添加 %@",[NSString stringWithFormat:@"hello %d",i]);
    }
    
    //输出缓存中的数据
    for (int i = 0; i < 10; i++) {
        NSLog(@"%@",[self.cache objectForKey:[NSString stringWithFormat:@"h%d",i]]);
    }

}