在iOS8中禁用单个子视图上的自动旋转 [英] Disable autorotate on a single subview in iOS8

问题描述

我正在编写绘图应用程序，我不希望绘图视图旋转。同时，我希望其他控件可以很好地旋转，具体取决于设备的方向。在iOS 7中，我通过以下方式解决了这个问题：

I'm writing a drawing app and I don't want the drawing view to rotate. At the same time, I want other controls to rotate nicely depending on the orientation of the device. In iOS 7 I've solved this via:

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    float rotation;

    if (toInterfaceOrientation==UIInterfaceOrientationPortrait) {
        rotation = 0;
    }
    else if (toInterfaceOrientation==UIInterfaceOrientationLandscapeLeft) {
        rotation = M_PI/2;
    } else if (toInterfaceOrientation==UIInterfaceOrientationLandscapeRight) {
        rotation = -M_PI/2;
    }

    self.drawingView.transform = CGAffineTransformMakeRotation(rotation);
    self.drawingView.frame = self.view.frame;
}

但是在iOS 8上，即使调用了函数并且转换设置正确，它不会阻止视图旋转。

But on iOS 8 even though the function is called and the transform is set correctly, it does not prevent the view from rotating.

我尝试创建一个视图控制器，它只是阻止视图的旋转并将其视图添加到视图层次结构中，但它没有响应用户输入。

I've tried creating a view controller which simply prevents the rotation of it's view and add it's view to the view hierarchy, but then it doesn't respond to user input.

任何想法？

谢谢！

推荐答案

在与subviews和transitionCoordinators进行一些战斗之后，我终于想通了：

Okay after some fighting with subviews and transitionCoordinators I've finally figured it out:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    CGAffineTransform targetRotation = [coordinator targetTransform];
    CGAffineTransform inverseRotation = CGAffineTransformInvert(targetRotation);

    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

        self.drawingView.transform = CGAffineTransformConcat(self.drawingView.transform, inverseRotation);

        self.drawingView.frame = self.view.bounds;
    } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
    }];
}

我做的是，我计算应用于视图的变换的倒数然后用它来改变变换。此外，我用视图边界更改框架。这是因为它是全屏的。

What I do is, I calculate the inverse of the transform applied to the view and then use it to change the transform. furthermore I change the frame with the view bounds. This is due to it being full screen.

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