xcode iPhone：UIImagePickerController - 标准缩放控制不起作用
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iPhone: UIImagePickerController - standard zoom control doesn't work
提问by Jordan Smith
I have a UIImagePickerController that is presented as a modal view controller. This works fine, except for when I try to add anything to the camera overlay view.
我有一个 UIImagePickerController，它显示为一个模态视图控制器。这很好用，除非我尝试向相机叠加视图添加任何内容。
As soon as I modify the camera overlay view, the default zoom control stops working (although tap to focus still works). If I tap on the view, the zoom slider appears, but I am not able to slide it up and down like usual.
一旦我修改了相机叠加视图，默认的缩放控制就会停止工作（尽管点击对焦仍然有效）。如果我点击视图，会出现缩放滑块，但我无法像往常一样上下滑动它。
Here's the code I'm using:
这是我正在使用的代码：
imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePickerController.allowsEditing = NO;
imagePickerController.delegate = self;
imagePickerController.showsCameraControls = YES;
imagePickerController.wantsFullScreenLayout = NO;
[imagePickerController.cameraOverlayView addSubview:overlayView];
[self presentModalViewController:imagePickerController animated:YES];
Has anyone had a similar problem or can see what I'm doing wrong? I know it should work, as I've seen it on other apps that also use the default camera controls.
有没有人遇到过类似的问题，或者可以看到我做错了什么？我知道它应该可以工作，因为我在其他也使用默认相机控件的应用程序中看到过它。
Thanks :)
谢谢 ：）
采纳答案by Jordan Smith
After a lot of mucking round I've finally come across a solution. Don't use the cameraOverlayView property, instead add a subview to the UIImagePickerController with a frame of size CGRectZero.
经过一番折腾，我终于找到了一个解决方案。不要使用 cameraOverlayView 属性，而是将一个子视图添加到 UIImagePickerController 中，框架大小为 CGRectZero。
In the following example, overlayView is a custom subclass of UIView which draws an image and passes touches through to the next responder:
在以下示例中，overlayView 是 UIView 的自定义子类，它绘制图像并将触摸传递给下一个响应者：
OverlayView *overlayView = [[OverlayView alloc] initWithFrame:CGRectZero];
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePickerController.allowsEditing = NO;
imagePickerController.delegate = self;
imagePickerController.showsCameraControls = YES;
[imagePickerController.view addSubview:overlayView];
statViewController.imagePickerController = imagePickerController;
}
-
——
And then, everything just works. Not sure if adding a subview to UIImagePickerController is documented and ok with Apple, but heaps of other apps use this (or a similar workaround) so shouldn't cause any submission problems.
然后，一切正常。不确定将子视图添加到 UIImagePickerController 是否记录在案并且与 Apple 一起使用，但其他应用程序的大量使用此（或类似的解决方法），因此不应导致任何提交问题。
