iOS 清理缓存功能的实现第二种方法

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/**

 *  清理缓存第二种方法

 *

 *  @param sender <#sender description#>

 */

- (void)clearCache:(id)sender

{

    //彻底清除缓存第一种方法

    UIButton * button = sender;

    [button setTitle:@"清理完毕" forState:UIControlStateNormal];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);

    NSString *path = [paths lastObject];

    NSString *str = [NSString stringWithFormat:@"缓存已清除%.1fM", [self folderSizeAtPath:path]];

    NSLog(@"%@",str);

    NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];

    for (NSString *p in files) {

        NSError *error;

        NSString *Path = [path stringByAppendingPathComponent:p];

        if ([[NSFileManager defaultManager] fileExistsAtPath:Path]) {

            [[NSFileManager defaultManager] removeItemAtPath:Path error:&error];

        }

    }

}

/**

 *  计算单个文件大小

 */

- (long long) fileSizeAtPath:(NSString*) filePath{

    NSFileManager* manager = [NSFileManager defaultManager];

    if ([manager fileExistsAtPath:filePath]){

        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];

    }

    return 0;

}

/**

 *  计算目录大小  遍历文件夹获得文件夹大小，返回多少M

 */

- (float ) folderSizeAtPath:(NSString*) folderPath{

    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);

}