仅在ios中旋转视图

Question

我的应用程序仅在纵向模式下受支持。 我要求仅根据设备方向旋转特定的UIView 。

你能帮我么？

Answer 1

在您的viewdidload或init中添加以下代码

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

[[NSNotificationCenter defaultCenter] addObserver: self selector:   @selector(deviceOrientationDidChange:) name: UIDeviceOrientationDidChangeNotification object: nil];

在deviceOrientationDidChange函数中，您将获得设备方向，据此您可以更新视图

- (void)deviceOrientationDidChange:(NSNotification *)notification {
     //Obtain current device orientation
     UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

      //Do my thing
 }

Answer 2

if (interfaceOrientation == UIInterfaceOrientationPortrait) {
    // set your view frame work for portrait mode

}
else {
// set new frame of view for landscape mode.
}

希望你能明白。 谢谢

Answer 3

经过长时间的尝试，我使用CGAffineTransform找到了答案。

- (void)deviceOrientationDidChange:(NSNotification *)notification {
    //Obtain current device orientation
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    CGFloat angle;
    switch (orientation) {
        case UIDeviceOrientationPortraitUpsideDown:
            angle = M_PI;
            break;
        case UIDeviceOrientationLandscapeRight:
            angle = - M_PI_2;
            break;
        case UIDeviceOrientationLandscapeLeft:
            angle = M_PI_2;
            break;
        case UIDeviceOrientationPortrait:
        default:
            angle = 0.f;
            break;
    }
    animationView.transform= CGAffineTransformMakeRotation(angle);
    animationView.frame = self.view.frame;
}