iOS强制横屏或强制竖屏

原文链接 https://www.jianshu.com/p/d6cb54d2eaa1
亲测第二种我这边是阔以滴

第一种解决方案（不推荐，直接跳过看第二种解决方案）：

//强制转屏
- (void)interfaceOrientation:(UIInterfaceOrientation)orientation
{
    if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
        SEL selector  = NSSelectorFromString(@"setOrientation:");
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = orientation;
        // 从2开始是因为0 1 两个参数已经被selector和target占用
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }
}

强制横屏：

[self interfaceOrientation:UIInterfaceOrientationLandscapeRight];

强制竖屏：

[self interfaceOrientation:UIInterfaceOrientationPortrait];

只在某一个界面提供转屏的解决方法如下AppDelegate.m下操作

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    
    NSLog(@"0000000---------%@",NSStringFromClass([[self topViewController] class]));
    if ([NSStringFromClass([[self topViewController] class]) isEqualToString:@"想要提供转屏的控制器的名字"]) {
      //横屏
        return UIInterfaceOrientationMaskLandscapeRight;
    }
      //竖屏
    return UIInterfaceOrientationMaskPortrait;
}
//获取界面最上层的控制器
- (UIViewController*)topViewController {
    return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
//一层一层的进行查找判断
- (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* nav = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:nav.visibleViewController];
    } else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
}

如果你的应用的根控制器是Nav就把下面这段代码放到Nav根控制器下，如果是TabVC放到TabVC的下面

- (BOOL)shouldAutorotate{
    return YES;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskPortrait;
}

然后在你想横屏的控制器加上这段代码，基本上横屏问题就可以搞定了，前提是你的这个控制器是moda出来的，如果是push的话就要使用上文提到的强制横竖屏的方法，下面这段代码是不起作用的

- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscapeRight;
}

第二种解决方案：

灵活设置横竖屏，不用区分Push还是Present,都是可以设置。

第一步：

在AppDelegate.h中添加旋转属性

/**
 * 是否允许转向
 */
@property(nonatomic,assign)BOOL allowRotation;

在AppDelegate.m中添加转屏的代理方法

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window

{
    
    if (self.allowRotation == YES) {
        //横屏
        return UIInterfaceOrientationMaskLandscape;
        
    }else{
        //竖屏
        return UIInterfaceOrientationMaskPortrait;
        
    }
    
}

第二步：

设置横竖屏的核心方法，我是直接把这个方法添加到了UIDevice的分类中，代码如下：

• UIDevice+TFDevice.h :

#import <UIKit/UIKit.h>
@interface UIDevice (TFDevice)
/**
 * @interfaceOrientation 输入要强制转屏的方向
 */
+ (void)switchNewOrientation:(UIInterfaceOrientation)interfaceOrientation;
@end

• UIDevice+TFDevice.m :

#import "UIDevice+TFDevice.h"

@implementation UIDevice (TFDevice)

+ (void)switchNewOrientation:(UIInterfaceOrientation)interfaceOrientation
{
        
        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
        
        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
        
        NSNumber *orientationTarget = [NSNumber numberWithInt:interfaceOrientation];
        
        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
    
}
@end

第三步：

在需要设置横屏的控制器的ViewDidLoad中添加下面代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    //允许转成横屏
    appDelegate.allowRotation = YES;
    //调用横屏代码
    [UIDevice switchNewOrientation:UIInterfaceOrientationLandscapeRight];
}

第四步 (针对Push出的控制器来说)：

需要注意的是push过去的时候变成横屏，pop出去的时候在设置竖屏，此时最好禁用系统的侧滑返回手势。

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //禁用侧滑手势方法
    self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    //禁用侧滑手势方法
    self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}

第五步：

push控制器：

//点击导航栏返回按钮的时候调用，所以Push出的控制器最好禁用侧滑手势：
AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = NO;//关闭横屏仅允许竖屏
//切换到竖屏
[UIDevice switchNewOrientation:UIInterfaceOrientationPortrait];
   
[self.navigationController popViewControllerAnimated:YES];

present控制器：

AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = NO;//关闭横屏仅允许竖屏
//切换到竖屏
[UIDevice switchNewOrientation:UIInterfaceOrientationPortrait];
    
[self dismissViewControllerAnimated:YES completion:nil];

第六步: 上图