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); }