ios 按键横竖屏设置

手动设置竖屏：修改currentDevice orientation需要在setStatusBarOrientation前

            bool IsIOS8 = NO;
            float version = [[[UIDevice currentDevice] systemVersion] floatValue];
            if (version >= 8.0)
            {
                IsIOS8 = YES;
            }
            
            //改设备方向
            //if (IsIOS8) {
                [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIInterfaceOrientationPortrait] forKey:@"orientation"];
            //}
            [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:NO];

UIApplication需要实现方法或者监听UIApplicaionDelegate委托回调

方法 1）UIApplication需要实现

-(NSUInteger)supportedInterfaceOrientations {
    UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
    UIInterfaceOrientation statusBarOrientation =[UIApplication sharedApplication].statusBarOrientation;
    if(deviceOrientation == UIDeviceOrientationPortrait || deviceOrientation == UIDeviceOrientationPortraitUpsideDown){
        if(statusBarOrientation != UIInterfaceOrientationPortrait ||statusBarOrientation != UIInterfaceOrientationPortraitUpsideDown){
            return 0;
        }
    }
    // otherwise
    return UIInterfaceOrientationMaskLandscape;
}

 方法 2）UIApplicaionDelegate委托接口

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
    UIInterfaceOrientation statusBarOrientation =[UIApplication sharedApplication].statusBarOrientation;
    if(deviceOrientation == UIDeviceOrientationPortrait || deviceOrientation == UIDeviceOrientationPortraitUpsideDown){
        if(statusBarOrientation != UIInterfaceOrientationPortrait ||statusBarOrientation != UIInterfaceOrientationPortraitUpsideDown){
            return 0;
        }
    }
    // otherwise
    return UIInterfaceOrientationMaskLandscape;
    
    // UIInterfaceOrientationMaskAll
    // it is the safest way of doing it:
    // - GameCenter and some other services might have portrait-only variant
    //     and will throw exception if portrait is not supported here
    // - When you change allowed orientations if you end up forbidding current one
    //     exception will be thrown
    // Anyway this is intersected with values provided from UIViewController, so we are good
    //return   (1 << UIInterfaceOrientationPortrait) | (1 << UIInterfaceOrientationPortraitUpsideDown)
    //| (1 << UIInterfaceOrientationLandscapeRight) | (1 << UIInterfaceOrientationLandscapeLeft);
}