IOS enables a single page to support vertical and horizontal screen, other pages can only portrait screen

 最近在自己的项目里面  

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The implementation method is as follows:
1 first need to select the supported screen orientation in Xcode

2 in Appdelegate
. h

@property (nonatomic,assign)NSInteger allowRotate; 

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. m medium

//This method will be called when the device changes in the screen-(Nsuinteger) Application: (UIWindow *)    window{//NSLog (@ "Direction =============%ld", _allowrotate); if (_allowrotate = 1) {return Uiinterfaceorientationmaskall; }else{return (uiinterfaceorientationmaskportrait);}} //returns whether device auto-rotation is supported-(bool) shouldautorotate{if (_allowrotate = = 1) {return yes; } return no;}        

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3 in a controller that needs to support the screen:

In Viewwillapplear

//在视图出现的时候，将allowRotate改为1，    AppDelegate * delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;    delegate.allowRotate = 1;

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In Viewwilldisappear

//在视图出现的时候，将allowRotate改为0，    AppDelegate * delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;    delegate.allowRotate = 0;

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After writing the above code, you will find some problems: when the horizontal screen page directly click the "Back" button to exit, the page is still a horizontal screen, and we need only one page can be horizontal screen, the test needs to add the following code in the Viewwilldisappear:

    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 = UIInterfaceOrientationPortrait;        [invocation setArgument:&val atIndex:2];        [invocation invoke];    }

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At this point, you can make the app only have Settings page support screen!

In this case, if the app requires the user to change the UI in a horizontal vertical screen (a different UI for a horizontal screen and a vertical screen), you can do so in the following ways

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{    // do something before rotation    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) { 屏幕从竖屏变为横屏时执行 }else{ 屏幕从横屏变为竖屏时执行 } }- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ // do something after rotation}

IOS enables a single page to support vertical and horizontal screen, other pages can only portrait screen