ios - 如何将 viewWillLayoutSubviews 转换为 viewWillTransitionToSize

Question

我正在使用 viewWillLayoutSubviews 来检测方向变化，但由于在 iOS 8 和 Xcode 6 中已弃用，我需要使用新的 viewWillTransitionToSize。我的问题是我无法使用它。

我的 viewWillLayoutSubviews 是:

- (void)viewWillLayoutSubviews{
    NSInteger maxQuantityForWidth = MAX(3, [self.barButtons count]);
    CGFloat buttonWidth = (CGRectGetWidth(self.tabBar.bounds) - (kBarButtonSeparation * (maxQuantityForWidth - 1))) / maxQuantityForWidth;
    for (NSInteger i = 0; i < [self.barButtons count]; i++) {
        [self.barButtons[i] setFrame:CGRectMake(i * ((buttonWidth + kBarButtonSeparation)), 2.0, buttonWidth, CGRectGetHeight(self.tabBar.bounds) - 2.0)];
    }
    if ([self isShowingTabBar]) {
        self.functionalityContainer.frame = CGRectMake(0.0, CGRectGetHeight(self.tabBar.bounds), CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds) - CGRectGetHeight(self.tabBar.bounds));
    } else {
        self.functionalityContainer.frame = self.view.bounds;
    }

    if (IS_IPAD){
        [self updateToolbar];
        CGRect frame = self.slidingViewController.topViewController.view.frame;
        if (LANDSCAPE) {
            frame.size.width = 700;
        } else {
            frame.size.width = 768;
        }
        [self.slidingViewController.topViewController.view setFrame:frame];
    }
  }

它是使用 ECSLidingViewController 的导航部分的一部分。

我尝试了以下方法:

- (void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        [self updateToolbar];

    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        if (IS_IPAD){
            CGRect frame = self.slidingViewController.topViewController.view.frame;

            if (LANDSCAPE) {
                NSInteger maxQuantityForWidth = MAX(3, [self.barButtons count]);
                CGFloat buttonWidth = (758 - (kBarButtonSeparation * (maxQuantityForWidth - 1))) / maxQuantityForWidth;
                for (NSInteger i = 0; i < [self.barButtons count]; i++) {
                    [self.barButtons[i] setFrame:CGRectMake(i * ((buttonWidth + kBarButtonSeparation)), 2.0, buttonWidth, CGRectGetHeight(self.tabBar.bounds) - 2.0)];
                }
                frame.size.width = 768;
            } else {
                NSInteger maxQuantityForWidth = MAX(3, [self.barButtons count]);
                CGFloat buttonWidth = (758 - (kBarButtonSeparation * (maxQuantityForWidth - 1))) / maxQuantityForWidth;
                for (NSInteger i = 0; i < [self.barButtons count]; i++) {
                    [self.barButtons[i] setFrame:CGRectMake(i * ((buttonWidth + kBarButtonSeparation)), 2.0, buttonWidth, CGRectGetHeight(self.tabBar.bounds) - 2.0)];
                }
                frame.size.width = 768;
            }
            [self.slidingViewController.topViewController.view setFrame:frame];
        }

        if([self isShowingTabBar]){
            [self showTabBar];
        }else{
            [self hideTabBar];
        }
        if (IS_IPAD && LANDSCAPE) {
            self.slidingViewController.resetStrategy = ECNone;
            [self.navigationItem setLeftBarButtonItems:@[] animated:YES];
            if (!self.slidingViewController.underLeftShowing) {
                [self.slidingViewController anchorTopViewTo:ECRight];
            }
        } else {
            self.slidingViewController.resetStrategy = ECTapping | ECPanning;
            [self.navigationItem setLeftBarButtonItems:@[self.displayMenuBarButtonItem] animated:YES];
            [self.slidingViewController resetTopView];
        }
        [self.slidingViewController.topViewController.view setNeedsDisplay];
        [self.functionalityNavigationController.view setNeedsDisplay];

        [self.view setNeedsDisplay];
    }];

    NSString *orientation = [[NSString alloc]initWithFormat:@"Larghezza: %f Altezza: %f", self.view.frame.size.width, self.view.frame.size.height];
    [self.view makeToast:orientation duration:3.0 position:@"bottom"];
    [super viewWillTransitionToSize: size withTransitionCoordinator: coordinator];
}

但它不起作用，它似乎不“理解”它是横向还是纵向。知道如何解决吗？

*** 编辑:

这里是我使用的定义

#define LANDSCAPE UIInterfaceOrientationIsLandscape(self.interfaceOrientation)
#define LANDSCAPE_RIGHT [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft
#define LANDSCAPE_LEFT [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeRight
#define PORTRAIT UIInterfaceOrientationIsPortrait(self.interfaceOrientation)
#define PORTRAIT_REVERSE [UIDevice currentDevice].orientation == UIDeviceOrientationPortraitUpsideDown

Answer 1

这个问题似乎有点“老”了，不管怎样，至少随着 iOS9 的引入(尤其是多任务)，不建议根据设备方向对当前的屏幕格式下结论——相反，应该评估当前屏幕尺寸。以下指示屏幕格式是纵向还是横向:

- (void) viewWillTransitionToSize : (CGSize) screenSize withTransitionCoordinator : (id<UIViewControllerTransitionCoordinator> _Nonnull) coordinator
{
    BOOL isLandscapeOrientation = (screenSize.width > screenSize.height);
    ...
    ...
}