iOS OC 删除本地文件

//删除旧版数据库文件
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *dataBasePath = [NSString stringWithFormat:@"%@/ztfhome.db",[NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory , NSUserDomainMask , YES ) lastObject]];
if ([fileManager removeItemAtPath:dataBasePath error:NULL]) {
NSLog(@"删除成功");
[WUserDeFault setObject:@"YES" forKey:DeleteDataBaseVersion];
}else{
NSLog(@"删除失败");
}