ios - 如何将父 View Controller 设置为对象，以便我可以调用它的方法之一？

Question

我需要向父 View Controller 发送数据；所以(在父级中)我创建了一个方法 setLocWithName: loc: 来执行此操作。如何创建一个作为父 Controller 的对象？我尝试了 parentViewController 以及 presentingViewController (如下所示)，但我收到警告:

使用“UIViewController *”类型的表达式初始化“TDViewController *__strong”时不兼容的指针类型

// set object of parent view controller
TDViewController *tDViewController = [[self navigationController] presentingViewController];

// get data
NSArray *locs = [[PLStore sharedStore] allLocs];
PL *setselectedLoc = [locs objectAtIndex:[indexpath row]];

// send data to parent view controller 
[tDViewController setLocWithName:[setselectedLoc pLocName] loc:[setselectedLoc loc1]];

// Pop this view controller off the stack
[self.navigationController popViewControllerAnimated:YES];

Answer 1

假设presentingViewController(或parentViewController？)实际上是TDViewController类型，你只需要在第一行进行强制转换:

TDViewController *tDViewController = (TDViewController *)[[self navigationController] presentingViewController];