iOS使App中某一个界面强制横屏布局?

App中其它界面都是竖屏, 只有一个界面是需要横屏的, 怎样使这个界面强制横屏布局?

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如果需要特定ViewController旋转, 可以为UINavigationController添加Category(类目)UINavigationController+InterfaceOrientation, 然后在指定的ViewController中调用即可.

@implementation UINavigationController (InterfaceOrientation)
- (BOOL)shouldAutorotate
{
    if ([self.topViewController respondsToSelector:@selector(shouldAutorotate)]) {
        return [self.topViewController shouldAutorotate];
    }
    return NO;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if ([self.topViewController respondsToSelector:@selector(supportedInterfaceOrientations)]) {
        return [self.topViewController supportedInterfaceOrientations];
    }
    return [super supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    if ([self.topViewController respondsToSelector:@selector(preferredInterfaceOrientationForPresentation)]) {
        return [self.topViewController preferredInterfaceOrientationForPresentation];
    }
    return [super preferredInterfaceOrientationForPresentation];
}
@end

另外, 推荐一篇博文: http://www.molotang.com/articles/1530.html. 对于不同级别的屏幕旋转梳理的较为清晰.

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那怎么保证其它界面始终是竖屏呢

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使用如下这种方式，在需要横屏的页面添加。

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);
}