iOS 屏幕旋转 nav+tabbar+present(网页) 2016

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,该网页需要横屏显示,其他页面不变  都保持竖屏。

XCode Version 7.2.1

 

 

网上一搜,都说到在nav或者tabbar中设置以下3个方法。

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

 

确实实现了横屏的需求,但是发现了一个bug

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可以显示回正常竖屏,但是。。。。

最终 参考了一个老外的做法。传送门

该实现方式主要代码为:在AppDelegate中添加以下方法

- (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:

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

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

demo地址

 

posted on 2016-03-17 15:41  toward fai  阅读(679)  评论(0编辑  收藏  举报