中心缩放的实时 iPhone 相机视图，“CGAffineTransformTranslate”不工作

发布于 2024-08-17 06:55:43 字数 525 浏览 6 评论 0原文

我有一个小问题无法解决。我真的希望有人能帮助我。我想调整实时摄像机视图的大小并将其放置在中心，使用下面的代码：

    picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, 0.5, 0.56206);
    picker.cameraViewTransform = CGAffineTransformTranslate(picker.cameraViewTransform, 80, 120);

但我得到的只是屏幕左上角的缩放 1/2 大小的视图。似乎“CGAffineTransformTranslate”什么也没做。即使我使用时，翻译也不起作用：

     picker.cameraViewTransform = CGAffineTransformMake(1, 0, 0, 1, 80, 120);

翻译部分似乎对实时摄像机视图没有影响。希望有人能启发我。

谢谢。

原文

I have a little problem which I could not solve. I really hope someone can help me with that. I wanted to resize the live camera view and place it in the center, using the following code below:

    picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, 0.5, 0.56206);
    picker.cameraViewTransform = CGAffineTransformTranslate(picker.cameraViewTransform, 80, 120);

But all I got was a scaled 1/2 sized view on the top left of the screen. It seems as though "CGAffineTransformTranslate" does nothing at all. The translation didn't work even when I used:

     picker.cameraViewTransform = CGAffineTransformMake(1, 0, 0, 1, 80, 120);

The translation portion seems to have no effect on the live camera view.
Hope someone can enlighten me.

Thanks.

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二货你真萌 2024-08-24 06:55:43

我也在同一条船上。我所做的就是物理移动拾取器框架。

[picker.view setFrame:CGRectMake(xOffset,yOffset,picker.view.frame.size.width,picker.view.frame.size.height)];

I was in the same boat. What I did was physically move the picker frame.

[picker.view setFrame:CGRectMake(xOffset,yOffset,picker.view.frame.size.width,picker.view.frame.size.height)];

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一梦等七年七年为一梦 2024-08-24 06:55:43

我一直在为同样的问题而苦苦挣扎。我已经确认缩放和旋转预览有效，但翻译似乎被忽略。我推测设置变换时 CGAffineTransform 的 tx, ty 部分将被忽略。这是 iPhone OS v3.1.2 的情况。我现在没有其他操作系统版本可供测试。

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薄暮涼年 2024-08-24 06:55:43

我得到了解决方案。
必须在消息上设置：

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated

示例代码：

#pragma mark -
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{   
    CGFloat width = [[self view] bounds].size.width;
    CGFloat height = width/4*3;
    CGSize sizeOfCamera = CGSizeMake(width, height);
    CGAffineTransform t = CGAffineTransformMakeScale(0.5, 0.5);
    [picker setCameraViewTransform:t];

    // Now the image is automatically aligned to center.
    // Translation matrix also can be applied, but didn't use because it's already aligned to center.
}

I got solution.
It must be set on message:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated

Sample code:

#pragma mark -
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{   
    CGFloat width = [[self view] bounds].size.width;
    CGFloat height = width/4*3;
    CGSize sizeOfCamera = CGSizeMake(width, height);
    CGAffineTransform t = CGAffineTransformMakeScale(0.5, 0.5);
    [picker setCameraViewTransform:t];

    // Now the image is automatically aligned to center.
    // Translation matrix also can be applied, but didn't use because it's already aligned to center.
}

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