获取App的Cache缓存大小---iOS笔记摘录

获取缓存大小

// 获取缓存大小
-(NSString*)getCacheSize{
    
    // 获取缓存路径
    NSString *cachPath=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) firstObject];
    float size=[self folderSizeAtPath:cachPath];
    
    if (size == 0.0){
        return @"无缓存";
    }else if (size < 1000){
        return [NSString stringWithFormat:@"%fB", size];
    }else if(size < 1024 * 1024){
        return [NSString stringWithFormat:@"%.2fKB", size / 1024.0];
    }else if(size < 1024 * 1024 * 1024){
        return [NSString stringWithFormat:@"%.2fMB", size / (1024.0 * 1024)];
    }else if(size < 1024 * 1024 * 1024 * 1024ull){
        return [NSString stringWithFormat:@"%.2fGB", size / (1024.0 * 1024 * 1024)];
    }else{
        return [NSString stringWithFormat:@"%.2fTB", size / (1024.0 * 1024 * 1024 * 1024)];
    }
}




// 遍历文件夹获得文件夹大小，返回多少 M（提示：你可以在工程界设置（)m）
-(float)folderSizeAtPath:( NSString *) folderPath{
    
    // manager
    NSFileManager * manager = [NSFileManager defaultManager];
    if (![manager fileExistsAtPath :folderPath]) return 0 ;
    
    //
    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath :folderPath] objectEnumerator ];
    NSString * fileName;
    long long folderSize = 0 ;
    while ((fileName = [childFilesEnumerator nextObject ]) != nil ){
        
        NSString * fileAbsolutePath = [folderPath stringByAppendingPathComponent :fileName];
        folderSize += [self fileSizeAtPath :fileAbsolutePath];
    }
    
    return folderSize/( 1024.0 * 1024.0 );
}
// 计算单个缓存文件大小
-(long long)fileSizeAtPath:(NSString *)filePath{
    //
    NSFileManager * manager=[NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        return [[manager attributesOfItemAtPath:filePath error: nil] fileSize];
    }
    return 0 ;
}

清空缓存

-(void)clearCache{
    NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
    NSArray * files = [[ NSFileManager defaultManager ] subpathsAtPath :cachPath];
    NSLog ( @"cachpath = %@" , cachPath);
    for ( NSString * p in files) {
        NSError * error = nil ;
        NSString * path = [cachPath stringByAppendingPathComponent :p];
        if ([[ NSFileManager defaultManager ] fileExistsAtPath :path]) {
            [[ NSFileManager defaultManager ] removeItemAtPath :path error :&error];
        }
    }

    // OK
}