ios开发强制横竖屏转换

第一种：手动的设置界面元素的旋转，包括状态栏、导航栏和视图。以下代码为从竖屏设置为横屏，坐标系是以竖屏的为基准，所以会出现负数的坐标值。

    //设置状态栏旋转

    [[UIApplication sharedApplication] setStatusBarOrientation:UIDeviceOrientationLandscapeRightanimated:YES];

    CGFloat duration = [UIApplication sharedApplication].statusBarOrientationAnimationDuration;

    //设置旋转动画

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:duration];    

    //设置导航栏旋转

    self.navigationController.navigationBar.frame = CGRectMake(-204, 224, 480, 32);

    self.navigationController.navigationBar.transform = CGAffineTransformMakeRotation(M_PI*1.5);

    //设置视图旋转

    self.view.bounds = CGRectMake(0, -54, self.view.frame.size.width, self.view.frame.size.height);

    self.view.transform = CGAffineTransformMakeRotation(M_PI*1.5);

    [UIView commitAnimations]

第二种切换到下一个页面强制转横屏

        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 = UIInterfaceOrientationLandscapeRight;

            [invocation setArgument:&val atIndex:2];

            [invocation invoke];

        }