iPhone等待代码执行

我正在创建一个方法,该方法在用户按下按钮后运行。该方法根据用户定义的名称创建一个文件夹,并向该文件夹添加一个plist。问题是它没有创建plist。我知道代码是分开工作的,但我认为plist创建是在目录创建之前完成的。有没有办法增加一个“等到”条款? 谢谢

- (void) addTheDirectory{
NSString *theTitle = theTitleField.text;
NSString *theDescription = theDescriptionField.text;

//create the directory
[[NSFileManager defaultManager] createDirectoryAtPath:[NSString stringWithFormat:@"%@/%@", DOCUMENTS_FOLDER, theTitle] attributes:nil];

//create the plist
NSMutableDictionary* plistDictionary = [[NSMutableDictionary alloc] init];
[plistDictionary setValue:theTitle forKey:@"Title"];
[plistDictionary setValue:theDescription forKey:@"Description"];
[plistDictionary setValue:@"0.1" forKey:@"LBVersion"];
[plistDictionary writeToFile:[NSString stringWithFormat:@"%@/%@/info.plist", DOCUMENTS_FOLDER, theTitle] atomically: YES];
}