陈斌彬的技术博客

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iOS-addChildViewController

View Controller中可以添加多个sub view,在需要的时候显示出来;

可以通过viewController(parent)中可以添加多个child viewController;来控制页面中的sub view,降低代码耦合度;

通过切换,可以显示不同的view;,替代之前的addSubView的管理

   //在parent view controller 中添加 child view controller
   FirstViewController *firstViewController=[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    [self addChildViewController:firstViewController];

    SecondViewController *secondViewController=[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    [self addChildViewController:secondViewController];

    ThirdViewController *thirdViewController=[[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];
    [self addChildViewController:thirdViewController];

    [self.view  addSubview:thirdViewController.view];

  // addChildViewController回调用[child willMoveToParentViewController:self] ,但是不会调用didMoveToParentViewController,所以需要显示调用
    [thirdViewController didMoveToParentViewController:self];
    currentViewController=thirdViewController;

  //切换child view controller
     [self transitionFromViewController:currentViewController toViewController:firstViewController duration:4 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
            }  completion:^(BOOL finished) {
               //......
            }];
    currentViewController=firstViewController;

  //移除child view controller
    // removeFromParentViewController在移除child前不会调用[self willMoveToParentViewController:nil] ,所以需要显示调用
    [currentViewController willMoveToParentViewController:nil];
    [currentViewController removeFromSuperview];
    [currentViewController removeFromParentViewController];

Resource Reference