iOS 屏幕旋轉 nav＋tabbar+present(網頁) 2016

時間 2019-12-05

標籤 ios 屏幕旋轉 nav+tabbar+present nav tabbar present 網頁欄目 iOS 简体版

原文原文鏈接

如題，最近一個app架構爲 nav ＋ tabbar ，需求是在點擊tabbar中的一個菜單項時，彈出網頁，該網頁須要橫屏顯示，其餘頁面不變都保持豎屏。架構

XCode Version 7.2.1app

網上一搜，都說到在nav或者tabbar中設置如下3個方法。ide

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

View Code

確實實現了橫屏的需求，可是發現了一個bug：this

當app在橫屏的時候運行app 界面就是橫屏了，雖然進入關閉網頁時能夠顯示回正常豎屏，可是。。。。spa

最終參考了一個老外的作法。傳送門code

該實現方式主要代碼爲：在AppDelegate中添加如下方法blog

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    // Get topmost/visible view controller
    UIViewController *currentViewController = [self topViewController];
    
    // Check whether it implements a dummy methods called canRotate
    if ([currentViewController respondsToSelector:@selector(canRotate)]) {
        // Unlock landscape view orientations for this view controller
        
        
        if ([currentViewController isKindOfClass:[ViewController1 class]]) {
            if(((ViewController1 *)currentViewController).isShowPortrai){
                return UIInterfaceOrientationMaskPortrait;
            }else{
                return UIInterfaceOrientationMaskLandscapeRight;
            }
        }
        return UIInterfaceOrientationMaskLandscapeRight;
    }
    
    // Only allow portrait (standard behaviour)
    return UIInterfaceOrientationMaskPortrait;
}


- (UIViewController*)topViewController {
    return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}

- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
    if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController* tabBarController = (UITabBarController*)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
    } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController* navigationController = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
    } else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
    
}

View Code

其中改造部分爲：get

if(((ViewController1 *)currentViewController).isShowPortrai){
                return UIInterfaceOrientationMaskPortrait;
            }else{
                return UIInterfaceOrientationMaskLandscapeRight;
            }

View Code

完美實現此效果：進入app時豎屏，進入網頁時橫屏，關閉網頁時返回豎屏。特此記錄it

注：只需在項目中設置下圖（默認設置），參考demo實現便可。其中左右旋轉看需求設置io

demo地址