iOS 7关闭模态视图控制器和强制纵向方向

3 回答

• 5

  如果模态控制器在解除之前处于横向方向，则呈现的ViewController可能不会返回到原点方向（纵向） . 问题是因为在控制器实际被解除之前调用了AppDelegate supportedInterfaceOrientationsForWindow方法，并且呈现的控制器检查仍然返回Landscape掩码 .

  设置一个标志以指示是否显示（模态） presented 视图控制器 .

  - (void)awakeFromNib // or where you instantiate your ViewController from
  {
      [super awakeFromNib];
      self.presented = YES;
  }
  
  - (IBAction)exitAction:(id)sender // where you dismiss the modal
  {
      self.presented = NO;
      [self dismissViewControllerAnimated:NO completion:nil];
  }
  

  并且在提供的模态中，ViewController根据标志设置方向：当呈现模态ViewController时 - 返回Landscape . 当它被解雇然后返回肖像

  - (NSUInteger)supportedInterfaceOrientations
  {
      if ([self isPresented]) {
          return UIInterfaceOrientationMaskLandscape;
      } else {
          return UIInterfaceOrientationMaskPortrait;
      }
  }
  

  最后一步 - 从你的AppDelegate调用模态呈现ViewController的方向 . 我只是检查当前呈现的ViewController并在其上调用supportedInterfaceOrientations

  - (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
  {
      NSUInteger orientationMask = UIInterfaceOrientationMaskPortrait;
  
      UIViewController *currentVC = self.window.rootViewController.presentedViewController; // gets the presented VC
      orientationMask = [currentVC supportedInterfaceOrientations];
  
      return orientationMask;
  }
  

  有关更多信息，请查看this link

  回复于 2024-04-30T08:40:32+08:00
• 1

  我最终继承了UINavigationController并重写了它的旋转方法 . 以下解决方案适用于iOS 7，但我相信iOS 8 beta 5中存在一个错误，导致视图控制器的视图在横向偏移模式后缩小到屏幕高度的一半 .

  UINavigationController子类：

  - (BOOL)shouldAutorotate
  {
      return NO;
  }
  
  - (NSUInteger)supportedInterfaceOrientations
  {
      return UIInterfaceOrientationMaskPortrait;
  }
  
  - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
  {
      return UIInterfaceOrientationPortrait;
  }
  

  回复于 2024-04-30T08:40:32+08:00
• 1

  此解决方案适用于iOS 8 .

  ---

  问题描述

  • 应用程序密钥窗口将UINavigationController的子类作为其rootViewController .

  • 此NC子类禁止某些接口方向 .

  • NC堆栈中的某些视图控制器（VC1）以模态和全屏方式呈现另一个视图控制器（VC2） .

  • 这个呈现的VC2允许比NC更多的接口方向 .

  • 用户将设备旋转到NC禁止的方向，但由提供的VC2允许 .

  • 用户驳回提供的VC2 .

  • VC1视图的帧不正确 .

  ---

  设置和插图

  UINavigationController的子类：

  - (NSUInteger)supportedInterfaceOrientations
  {
      return UIInterfaceOrientationMaskPortrait;
  }
  
  - (BOOL)shouldAutorotate
  {
      return YES;
  }
  

  VC1初始外观和UI视图堆栈：

  

  从VC1呈现VC2（该示例中的QLPreviewController）：

  QLPreviewController *pc = [[QLPreviewController alloc] init];
  pc.dataSource = self;
  pc.delegate = self;
  pc.modalPresentationStyle = UIModalPresentationFullScreen;
  [self.navigationController presentViewController:pc animated:YES completion:nil];
  

  显示VC2并将设备旋转为横向：

  

  VC2被解雇，设备返回纵向模式，但NC堆栈保持在横向状态：

  

  ---

  原因

  Apple文档说明：

  使用presentViewController：animated：completion：方法呈现视图控制器时，UIKit始终管理演示过程 . 该过程的一部分涉及创建适合给定演示样式的演示控制器 .

  显然处理UINavigationController堆栈时存在一个错误 .

  ---

  解决方案

  通过提供我们自己的转换委托可以绕过此错误 .

  BTTransitioningDelegate.h

  #import <UIKit/UIKit.h>
  
  @interface BTTransitioningDelegate : NSObject <UIViewControllerTransitioningDelegate>
  
  @end
  

  BTTransitioningDelegate.m

  #import "BTTransitioningDelegate.h"
  
  static NSTimeInterval kDuration = 0.5;
  
  // This class handles presentation phase.
  @interface BTPresentedAC : NSObject <UIViewControllerAnimatedTransitioning>
  
  @end
  
  @implementation BTPresentedAC
  
  - (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
  {
      return kDuration;
  }
  
  - (void)animateTransition:(id<UIViewControllerContextTransitioning>)context
  {
      // presented VC
      UIViewController *toVC = [context viewControllerForKey:UITransitionContextToViewControllerKey];
  
      // presented controller ought to be fullscreen
      CGRect frame = [[[UIApplication sharedApplication] keyWindow] bounds];
      // we will slide view of the presended VC from the bottom of the screen,
      // so here we set the initial frame
      toVC.view.frame = CGRectMake(frame.origin.x, frame.origin.y + frame.size.height, frame.size.width, frame.size.height);
  
      // [context containerView] acts as the superview for the views involved in the transition
      [[context containerView] addSubview:toVC.view];
  
      UIViewAnimationOptions options = (UIViewAnimationOptionCurveEaseOut);
  
      [UIView animateWithDuration:kDuration delay:0 options:options animations:^{
          // slide view to position
          toVC.view.frame = frame;
      } completion:^(BOOL finished) {
          // required to notify the system that the transition animation is done
          [context completeTransition:finished];
      }];
  }
  
  @end
  
  
  // This class handles dismission phase.
  @interface BTDismissedAC : NSObject <UIViewControllerAnimatedTransitioning>
  
  @end
  
  @implementation BTDismissedAC
  
  - (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
  {
      return kDuration;
  }
  
  - (void)animateTransition:(id<UIViewControllerContextTransitioning>)context
  {
      // presented VC
      UIViewController *fromVC = [context viewControllerForKey:UITransitionContextFromViewControllerKey];
      // presenting VC
      UIViewController *toVC = [context viewControllerForKey:UITransitionContextToViewControllerKey];
  
      // inserting presenting VC's view under presented VC's view
      toVC.view.frame = [[[UIApplication sharedApplication] keyWindow] bounds];
      [[context containerView] insertSubview:toVC.view belowSubview:fromVC.view];
  
      // current frame and transform of presented VC
      CGRect frame = fromVC.view.frame;
      CGAffineTransform transform = fromVC.view.transform;
  
      // determine current presented VC's view rotation and assemble
      // target frame to provide naturally-looking dismissal animation
      if (transform.b == -1) {
          // -pi/2
          frame = CGRectMake(frame.origin.x + frame.size.width, frame.origin.y, frame.size.width, frame.size.height);
      } else if (transform.b == 1) {
          // pi/2
          frame = CGRectMake(frame.origin.x - frame.size.width, frame.origin.y, frame.size.width, frame.size.height);
      } else if (transform.a == -1) {
          // pi
          frame = CGRectMake(frame.origin.x, frame.origin.y - frame.size.height, frame.size.width, frame.size.height);
      } else {
          // 0
          frame = CGRectMake(frame.origin.x, frame.origin.y + frame.size.height, frame.size.width, frame.size.height);
      }
  
      UIViewAnimationOptions options = (UIViewAnimationOptionCurveEaseOut);
  
      [UIView animateWithDuration:kDuration delay:0 options:options animations:^{
          // slide view off-screen
          fromVC.view.frame = frame;
      } completion:^(BOOL finished) {
          // required to notify the system that the transition animation is done
          [context completeTransition:finished];
      }];
  }
  
  @end
  
  
  @implementation BTTransitioningDelegate
  
  - (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
  {
      return [[BTPresentedAC alloc] init];
  }
  
  - (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
  {
      return [[BTDismissedAC alloc] init];
  }
  
  @end
  

  在呈现VC时导入转换委托：

  #import "BTTransitioningDelegate.h"
  

  存储对实例的强引用：

  @property (nonatomic, strong) BTTransitioningDelegate *transitioningDelegate;
  

  在_888168中实例化：

  self.transitioningDelegate = [[BTTransitioningDelegate alloc] init];
  

  适当时打电话：

  QLPreviewController *pc = [[QLPreviewController alloc] init];
  pc.dataSource = self;
  pc.delegate = self;
  pc.transitioningDelegate = self.transitioningDelegate;
  pc.modalPresentationStyle = UIModalPresentationFullScreen;
  
  [self.navigationController presentViewController:pc animated:YES completion:nil];
  

  回复于 2024-04-30T08:40:32+08:00