iOS强制横竖屏转换

https://www.jianshu.com/p/d6cb54d2eaa1  这篇文章给出的方案是可行的。

经测试，想要第一个界面强制横屏，第二个界面强制竖屏， dismiss掉之后回到第一个界面依然强制横屏。用户的手机设备禁止旋转按钮不打开状态下，旋转手机屏幕能依然强制横屏或者竖屏。

第一个界面强制横屏 在工程设置里

如果是要第一个界面强制竖屏 那么设置为

AppDelegate里的系统方法为：

AppDelegate.h里公开一个字段来确定是横屏还是竖屏

@property(nonatomic,assign)BOOL allowRotation;

AppDelegate.m文件中添加代码

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

{

if (self.allowRotation == YES) {

//横屏

return UIInterfaceOrientationMaskLandscape;

}else{

//竖屏

return UIInterfaceOrientationMaskPortrait;

}

}

在第一个界面的控制器里添加代码

#import "AppDelegate.h"

#import "UIDevice+TFDevice.h"

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

NSLog(@"%s",__func__);

AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

//允许转成横屏

appDelegate.allowRotation = YES;

//调用横屏代码

[UIDevice switchNewOrientation:UIInterfaceOrientationLandscapeLeft];

}

在第二个界面的控制器里

添加代码

#import "AppDelegate.h"

#import "UIDevice+TFDevice.h"

- (void)viewDidLoad {

[super viewDidLoad];

NSLog(@"%s",__func__);

AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

//允许转成竖屏

appDelegate.allowRotation = NO;

//调用竖屏代码

[UIDevice switchNewOrientation:UIInterfaceOrientationPortrait];

}

另外对UIDevice设备做一个分类扩展

@interface UIDevice (TFDevice)

/**

* @interfaceOrientation 输入要强制转屏的方向

*/

+ (void)switchNewOrientation:(UIInterfaceOrientation)interfaceOrientation;

@end

#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