iPhone - UIWindow根据当前方向旋转？

Question

我正在为我的应用添加一个额外的UIWindow.我的主窗口正确旋转,但我添加的这个附加窗口不会旋转.

根据当前设备方向旋转UIWindow的最佳方法是什么？

Answer 1

你需要为UIWindow自己动手.

侦听UIApplicationDidChangeStatusBarFrameNotification通知,然后在状态栏更改时设置转换.

您可以从中读取当前方向-[UIApplication statusBarOrientation],并像这样计算变换:

#define DegreesToRadians(degrees) (degrees * M_PI / 180)

- (CGAffineTransform)transformForOrientation:(UIInterfaceOrientation)orientation {

    switch (orientation) {

        case UIInterfaceOrientationLandscapeLeft:
            return CGAffineTransformMakeRotation(-DegreesToRadians(90));

        case UIInterfaceOrientationLandscapeRight:
            return CGAffineTransformMakeRotation(DegreesToRadians(90));

        case UIInterfaceOrientationPortraitUpsideDown:
            return CGAffineTransformMakeRotation(DegreesToRadians(180));

        case UIInterfaceOrientationPortrait:
        default:
            return CGAffineTransformMakeRotation(DegreesToRadians(0));
    }
}

- (void)statusBarDidChangeFrame:(NSNotification *)notification {

    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];

    [self setTransform:[self transformForOrientation:orientation]];

}

根据您的窗口大小,您可能还需要更新框架.

Answer 2

只需创建一个UIViewController自己的UIView,将其分配rootViewController给您的窗口,并将所有进一步的UI添加到控制器的视图(而不是直接添加到窗口),控制器将为您处理所有轮换:

UIApplication * app = [UIApplication sharedApplication];
UIWindow * appWindow = app.delegate.window;

UIWindow * newWindow = [[UIWindow alloc] initWithFrame:appWindow.frame];
UIView * newView = [[UIView alloc] initWithFrame:appWindow.frame];
UIViewController * viewctrl = [[UIViewController alloc] init];

viewctrl.view = newView;
newWindow.rootViewController = viewctrl;

// Now add all your UI elements to newView, not newWindow.
// viewctrl takes care of all device rotations for you.

[newWindow makeKeyAndVisible];
// Or just newWindow.hidden = NO if it shall not become key

当然,也可以在界面构建器中使用单行代码创建完全相同的设置(除了在显示窗口之前设置帧大小以填充整个屏幕).