在AppDelegate中添加方法关闭横竖屏切换,方法如下

1.AppDelegate.h中外露一个属性

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

2.AppDelegate.m中添加方法(如果属性值为YES,仅允许屏幕向左旋转,否则仅允许竖屏)

- (UIInterfaceOrientationMask)application:(UIApplication

*)application supportedInterfaceOrientationsForWindow:(nullable UIWindow

*)window

{

if (_allowRotation == YES) {

return UIInterfaceOrientationMaskLandscapeLeft;

}else{

return (UIInterfaceOrientationMaskPortrait);

}

}

第三步:

1.在需要强制横屏的控制器.m中添加旋转为横屏方法

- (void)setNewOrientation:(BOOL)fullscreen

{

if (fullscreen) {

NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];

[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

}else{

NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];

[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

}

}

2.view DidLoad中添加以下代码

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

appDelegate.allowRotation = YES;//(以上2行代码,可以理解为打开横屏开关)

[self setNewOrientation:YES];//调用转屏代码

3.重写导航栏返回箭头按钮,拿到返回按钮点击事件

- (void)back

{

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

appDelegate.allowRotation = NO;//关闭横屏仅允许竖屏

[self setNewOrientation:NO];

[self.navigationController popViewControllerAnimated:YES];

}