1.获取缓存目录

//获取缓存文件路径-(NSString *)getCachesPath{    // 获取Caches目录路径    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);    NSString *cachesDir = [paths objectAtIndex:0];        //指定文件名   // NSString *filePath = [cachesDir stringByAppendingPathComponent:@"com.nickcheng.NCMusicEngine"];        return cachesDir;}

 

2.计算缓存文件大小

//计算缓存文件的大小- (long long) fileSizeAtPath:(NSString*) filePath{    NSFileManager* manager = [NSFileManager defaultManager];    if ([manager fileExistsAtPath:filePath]){        //        //取得一个目录下得所有文件名//        NSArray *files = [manager subpathsAtPath:filePath];//        NSLog(@"files1111111%@ == %ld",files,files.count);//        //        // 从路径中获得完整的文件名（带后缀）//        NSString *exe = [filePath lastPathComponent];//        NSLog(@"exeexe ====%@",exe);//        //        // 获得文件名（不带后缀）//        exe = [exe stringByDeletingPathExtension];//        //        // 获得文件名（不带后缀）//        NSString *exestr = [[files objectAtIndex:1] stringByDeletingPathExtension];//        NSLog(@"files2222222%@  ==== %@",[files objectAtIndex:1],exestr);                        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];    }        return 0;}

清除缓存文件

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{                    NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];                                        NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];                    NSLog(@"files :%d",[files count]);                    for (NSString *p in files) {                        NSError *error;                        NSString *path = [cachPath stringByAppendingPathComponent:p];                        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {                            [[NSFileManager defaultManager] removeItemAtPath:path error:&error];                        }                    }                    [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nilwaitUntilDone:YES];});-(void)clearCacheSuccess{    NSLog(@"清理成功");}

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dispatch_async(                       dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)                       , ^{                           //获取缓存目录                           NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];                                                      NSError *error;                           if ([[NSFileManager defaultManager] fileExistsAtPath:cachPath]) {                               //如果存在就删除                               [[NSFileManager defaultManager] removeItemAtPath:cachPath error:&error];                           }                                                      [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];                       });//计算缓存文件的大小，多少M- (NSString *) fileSizeAtPath:(NSString*)cachPath{    NSFileManager* manager = [NSFileManager defaultManager];    if ([manager fileExistsAtPath:cachPath]){        unsigned long long length  = [[manager attributesOfItemAtPath:cachPath error:nil] fileSize];        float ff = length/1024.0/1024.0; //换算成多少M        NSString *size = [NSString stringWithFormat:@"%0.2fM",ff];        return size;    }    return 0;}//清理缓存后刷新-(void)clearCacheSuccess{    NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];    NSString *size = [self fileSizeAtPath:cachPath];    _setting.cache = size;    [self.tableView reloadData];        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"清理成功" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];    [alertView show];}