使用CGAffine进行旋转视图后的平移

Question

我有一个包含一些文本字段的视图.我像这样设置视图的方向

(void)deviceRotated:(id)sender
{
    UIDeviceOrientation orientation = [[UIDevice currentDevice]orientation];

    if (orientation == UIDeviceOrientationPortrait)
    {
        CGAffineTransform affine = CGAffineTransformMakeRotation (0.0);
        [self.View setTransform:affine];
    }

    if (orientation == UIDeviceOrientationPortraitUpsideDown)
    {
        CGAffineTransform affine = CGAffineTransformMakeRotation (M_PI * 180 / 180.0f);
        [self.View setTransform:affine];
    }
    else if (orientation == UIDeviceOrientationLandscapeLeft)
    {
        CGAffineTransform affine = CGAffineTransformMakeRotation (M_PI * 90 / 180.0f);  
        [self.View setTransform:affine];
    }
    else if (orientation == UIDeviceOrientationLandscapeRight)
    {
        CGAffineTransform affine = CGAffineTransformMakeRotation ( M_PI * 270 / 180.0f);
        [self.View setTransform:affine]; 
    }
}

我的问题是当键盘出现时我想让视图向上移动,因为键盘隐藏了一些文本字段.我想我必须使用CGAffineTransformMakeTranslation,但我不知道如何在旋转之后使用它.

有人可以帮我解决这个问题吗？

Answer 1

我们可以使用CGAffineTransformConcat.这是我为解决这个问题而编写的代码

CGAffineTransform rotate = CGAffineTransformMakeRotation (0.0);
CGAffineTransform translate = CGAffineTransformMakeTranslation(-5, -150);
self.alertView.transform = CGAffineTransformConcat(translate, rotate);

但我仍然不明白,为什么纵向和纵向颠倒方向的翻译必须使用不同的点x和y.在横向左侧和横向右侧方向也会发生这种情况