iphone - 关闭 Controller 时将值传递给父 Controller

Question

我想将数据发送到 parentviewcontroller 但以下代码崩溃了。给我解决方案

Post *vc;
vc.abc =@"Comment Conttroller";
[self.parentViewController dismissModalViewControllerAnimated:YES];

在这里，Post 是我调用 presentViewController:animated:completion 方法的 Controller 名称。

Answer 1

将其放入 viewDidLoad 中的父 Controller 中

// get register to fetch notification  
[[NSNotificationCenter defaultCenter] addObserver:self
                                      selector:@selector(yourNotificationHandler:)
                                      name:@"MODELVIEW DISMISS" object:nil];
// --> Now create method in parent class as;
// Now create yourNotificationHandler: like this in parent class
-(void)yourNotificationHandler:(NSNotification *)notice{
    NSString *str = [notice object];
}

将以下内容添加到您的子类中

-(void)dissmissModelView{

    [self dismissModalViewControllerAnimated:YES];
    NSLog(@"DismissModalviewController");

    //raise notification about dismiss 
    [[NSNotificationCenter defaultCenter] 
          postNotificationName:@"MODELVIEW DISMISS" 
                        object:@"Whatever you want to send to parent class"];  
}

一旦模型 View 被关闭，yourNotificationHandler 就会被执行，无论您作为对象传递什么，都将在您的父类中获取。请询问是否还需要澄清。