前言

在開發中有時會碰到旋轉屏幕的需求，例如直播時橫豎屏推流，這里我使用的一種方法時用純代碼強制翻轉，其他晚上方法也都使用過，但是效果并不好，目前這個方法還可以。

步驟

• 1.AppDelegate中配置

//AppDelegate.h
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
//允許橫屏
@property (nonatomic, assign) BOOL allowLandscapeRight;
@end

//AppDelegate.m 增加此方法
//橫豎屏切換使用
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if (self.allowLandscapeRight) {
        return UIInterfaceOrientationMaskLandscapeRight;
    }
    return UIInterfaceOrientationMaskPortrait;
}

• 2.在要跳轉的界面

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

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

• 3.在退出的時候

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    appDelegate.allowLandscapeRight = NO;
   //強制旋轉成豎屏
    NSNumber *value = [NSNumber numberWithInt:UIDeviceOrientationPortrait];
   [[UIDevice currentDevice]setValue:value forKey:@"orientation"];
   [UIViewController attemptRotationToDeviceOrientation];
}

問題

可能會碰到狀態欄不顯示的問題，詳見我的上一篇文章 iOS 狀態欄更改顏色、適配等