6 UINavigationController - 斯坦福 i

• 跳转时会调用的方法

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{

if([segue.identifier isEqualToString:@"DoSomething"]){

    if([segue.destinationViewController isKindOfClass:[DoSomethingVC class]]){
    
        DoSomethingVC *doVC = (DoSomethingVC *)segue.destinationViewController;
        doVC.neededInfo = ...;
    
    }
  }
}

• 返回父控制器的方法

[self.navigationController popViewControllerAnimated:YES];

• 是否准许某个 segue 的跳转

- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender{

if([segue.identifier isEqualToString:@"DoAParticularThing"]){

    return [self canDoAParticularThing] ? YES : NO;

    }
}