objective-c - subview 方向错误

Question

我有一个自定义转场，我正在尝试执行与标准“Cover Vertical”转场相反的操作。我认为这应该有效:

UIView *srcView = ((UIViewController *)self.sourceViewController).view;
UIView *dstView = ((UIViewController *)self.destinationViewController).view;

[dstView setFrame:CGRectMake(0, 0, srcView.window.bounds.size.width, srcView.window.bounds.size.height)];

[srcView.window insertSubview:dstView belowSubview:srcView];

[UIView animateWithDuration:0.3
     animations:^{
         srcView.center = CGPointMake(srcView.center.x - srcView.frame.size.width, srcView.center.y);
     }
     completion:^(BOOL finished){
         [srcView removeFromSuperview];
     }
 ];

问题是目标 View 以纵向显示，即使应用中的所有其他 View 都是横向的。此外，x 和 y 坐标是相反的。为什么会这样？

我已经在每个 View Controller 中设置了 shouldAutorotateToInterfaceOrientation，但这没有帮助。我可以使用 CGAffineTransformMakeRotation 旋转 View ，但这似乎不是正确的做法；一方面，坐标仍然会颠倒。

更新:

我尝试使用 CGAffineTransformRotate 来旋转 View ，但它看起来很荒谬。大多数背景显示为黑色。我认为这不是它应该的工作方式。

Answer 1

由于在 Controller 交换之前我无法获得目标 View 的正确方向和框架，所以我确实逆向了这个过程:

1. 将源 View 保存为图像(参见 Remove custom UIStoryboardSegue with custom animation)；
2. 切换当前 Controller [presentViewController: ...];
3. 然后，使用嵌入保存的源图像的(现在正确的)目标 View 制作动画。

完整代码如下:

#include <QuartzCore/QuartzCore.h>

@implementation HorizontalSwipingSegue

- (void) perform {
    UIViewController *source = self.sourceViewController;
    UIViewController *destination = self.destinationViewController;    
    UIView *sourceView = source.view;
    UIView *destinationView = destination.view;

    // Create a UIImageView with the contents of the source
    UIGraphicsBeginImageContext(sourceView.bounds.size);
    [sourceView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *sourceImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    UIImageView *sourceImageView = [[UIImageView alloc] initWithImage:sourceImage];

    [[self sourceViewController] presentViewController:[self destinationViewController] animated:NO completion:NULL];

    CGPoint destinationViewFinalCenter = CGPointMake(destinationView.center.x, destinationView.center.y);
    CGFloat deltaX = destinationView.frame.size.width;
    CGFloat deltaY = destinationView.frame.size.height;

    switch (((UIViewController *)self.sourceViewController).interfaceOrientation) {
       case UIDeviceOrientationPortrait:
            destinationView.center = CGPointMake(destinationView.center.x - deltaX, destinationView.center.y);                
            sourceImageView.center = CGPointMake(sourceImageView.center.x + deltaX, sourceImageView.center.y);
            break;
        case UIDeviceOrientationPortraitUpsideDown:
            destinationView.center = CGPointMake(destinationView.center.x + deltaX, destinationView.center.y);
            sourceImageView.center = CGPointMake(sourceImageView.center.x + deltaX, sourceImageView.center.y);
            break;
        case UIDeviceOrientationLandscapeLeft:
            destinationView.center = CGPointMake(destinationView.center.x, destinationView.center.y - deltaY);                
            sourceImageView.center = CGPointMake(sourceImageView.center.x + deltaY, sourceImageView.center.y);
            break;
        case UIDeviceOrientationLandscapeRight:
            destinationView.center = CGPointMake(destinationView.center.x, destinationView.center.y + deltaY);
            sourceImageView.center = CGPointMake(sourceImageView.center.x + deltaY, sourceImageView.center.y);
            break;
    }

    [destinationView addSubview:sourceImageView];

    [UIView animateWithDuration:0.6f
                     animations:^{
                         destinationView.center = destinationViewFinalCenter; 
                     }
                     completion:^(BOOL finished){
                         [sourceImageView removeFromSuperview];
                     }];
}

@end