ipad的竖屏在哪里设置（ipad平板怎么设置为竖屏） - 原点资讯

最主要的工作是重写一个ContainerViewCotroller，自定定义新ViewCotroller被push进来、旧ViewCotroller被pop移除后，后如何排版，以及其中动画如何展示等问题。

以push新ViewCotroller为例子

-(void)pushViewController:(UIViewController*)newVC animated:(bool)animated{ UIViewController* oldVC = 获得最倒数第一个ViewController [self pushOldViewController:oldVC newViewController: newVC animated: animated] } - (void)pushOldViewController:(UIViewController*)oldVC newViewController:(UIViewController*)newVC animated:(BOOL)animated { ... [oldVC beginAppearanceTransition:NO animated:animated]; //1.将新的Viewcontroller.view加入到根viewcontroller.view WrapperView* newWrapperView = [self appendWrapperViewWithViewController:newVC wrapperFrame:[self newViewControllerBeginFrame] toView:self.view animated:animated]; newVC.view.frame = [self childViewFrame]; newWrapperView.delegate = self; //2. 把新的Viewcontroller添加为子Viewcontroller [self addChildViewController:newVC]; //3. 进场动画 [UIView animateWithDuration:0.35 animations:^{ newWrapperView.frame = [super newViewControllerEndFrame]; ; } completion:^(BOOL finished) { //4. 进场动画结束 [oldVC endAppearanceTransition]; [newVC didMoveToParentViewController:self]; }]; }

退场

- (able UIViewController*)popViewControllerAnimated:(BOOL)animated { //1.移除倒数第一个Viewcontroller [lastViewController willMoveToParentViewController:nil]; [lastViewController beginAppearanceTransition:NO animated:animated]; //2.倒数第二个Viewcontroller即将显示 [secondToLastViewController beginAppearanceTransition:YES animated:animated]; //3.退场动画 [UIView animateWithDuration:0.35 animations:^{ lastWrapper.frame = [self newViewStartFrame]; secondToLastWrapper.frame = [self rightViewFrame]; } completion:^(BOOL finished) { //4.移除旧Viewcontroller.view [lastWrapper removeFromSuperview]; [lastViewController endAppearanceTransition]; [lastViewController removeFromParentViewController]; // 5.倒数第二个ViewController显示 [secondToLastViewController endAppearanceTransition]; }]; }

这部分功能很核心的工作是，在进场/退场后，依次调用相关函数，这些函数Viewcontroller的生命周期事件至关重要。

更详细接口文档：https://developer.apple.com/documentation/uikit/view_controllers/creating_a_custom_container_view_controller

https://developer.apple.com/library/archive/featuredarticles/ViewControllerPGforiPhoneOS/ImplementingaContainerViewController.html

2.原生界面改造

在横竖屏切换时，会导致ViewController.view触发重绘。使用原生进行布局的页面需要保持所有的view都是相对布局。这里推荐使用autolayout方式，这样既一套代码能完美的兼容iPhone/iPad

具体的工作有：

• 弃用[UIScreen main].bound.size，改为ViewController.view.size作为当前布局宽高仅仅支持单屏（iPhone）时，[UIScreen main].bound.size = ViewController.view.size但在iPad多屏横屏时[UIScreen main].bound.size ≠o ViewController.view.size
• 将绝对布局改为相对布局，即使用autolayout
• 感知横竖屏的切换事件