Question

我有一点我无法解决的问题。我真的希望有人可以帮助我。我想调整实时摄像机视图的大小并将其放在中心，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1/2尺寸缩放视图。似乎“CGAffineTransformTranslate”什么都不做。即使我使用过，翻译也无效：

     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。希望有人能够启发我。

感谢。

Answer 1

我在同一条船上。我所做的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)];

Answer 2

我一直在反对同样的问题。我已确认缩放和旋转预览有效，但翻译似乎被忽略。我推测在设置变换时，CGAffineTransform的tx，ty部分将被忽略。这是iPhone OS v3.1.2。我现在没有其他操作系统版本可供测试。

Answer 3

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.
}

在中心缩放实时iPhone相机视图，“CGAffineTransformTranslate”无法正常工作

3 个答案: