iOS 屏幕旋转 nav＋tabbar+present(网页) 2016

时间 2019-12-05

标签 ios 屏幕旋转 nav+tabbar+present nav tabbar present 网页栏目 iOS 繁體版

原文原文链接

如题，最近一个app架构为 nav ＋ tabbar ，需求是在点击tabbar中的一个菜单项时，弹出网页，该网页须要横屏显示，其余页面不变都保持竖屏。架构

XCode Version 7.2.1app

网上一搜，都说到在nav或者tabbar中设置如下3个方法。ide

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

View Code

确实实现了横屏的需求，可是发现了一个bug：this

当app在横屏的时候运行app 界面就是横屏了，虽然进入关闭网页时能够显示回正常竖屏，可是。。。。spa

最终参考了一个老外的作法。传送门code

该实现方式主要代码为：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

其中改造部分为：get

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

View Code

完美实现此效果：进入app时竖屏，进入网页时横屏，关闭网页时返回竖屏。特此记录it

注：只需在项目中设置下图（默认设置），参考demo实现便可。其中左右旋转看需求设置io

demo地址