iOS 强制旋转屏幕

前言

在开发中有时会碰到旋转屏幕的需求，例如直播时横竖屏推流，这里我使用的一种方法时用纯代码强制翻转，其他晚上方法也都使用过，但是效果并不好，目前这个方法还可以。

步骤

• 1.AppDelegate中配置

//AppDelegate.h
#import 
@interface AppDelegate : UIResponder <UIApplicationDelegate>
//允许横屏
@property (nonatomic, assign) BOOL allowLandscapeRight;
@end

//AppDelegate.m 增加此方法
//横竖屏切换使用
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if (self.allowLandscapeRight) {
        return UIInterfaceOrientationMaskLandscapeRight;
    }
    return UIInterfaceOrientationMaskPortrait;
}

• 2.在要跳转的界面

    AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    appDelegate.allowLandscapeRight = YES;
    //强制旋转成全屏
    NSNumber *value = [NSNumber numberWithInt:UIDeviceOrientationLandscapeLeft];
    [[UIDevice currentDevice]setValue:value forKey:@"orientation"];
    [UIViewController attemptRotationToDeviceOrientation];

    [self.navigationController pushViewController:[[YouVC alloc] init] animated:YES];

• 3.在退出的时候

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    appDelegate.allowLandscapeRight = NO;
   //强制旋转成竖屏
    NSNumber *value = [NSNumber numberWithInt:UIDeviceOrientationPortrait];
   [[UIDevice currentDevice]setValue:value forKey:@"orientation"];
   [UIViewController attemptRotationToDeviceOrientation];
}

问题

可能会碰到状态栏不显示的问题，详见我的上一篇文章 iOS 状态栏更改颜色、适配等