xcode 在视图层上方加载子视图
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Loading subview above view's Layer
提问by Shubhank
I followed a tutorial on taking pictures using AvFoundation Framework.. so i am not proficient in it.. thats one point.
我遵循了使用 AvFoundation Framework 拍照的教程..所以我不精通它..那是一点。
In the app..in the nib. There is a view(SUBVIEW) as a sub view of the main view(MAINVIEW). And there is a an image view and button as a subview of the subview View(SUBVIEW) not the Main view.
在应用程序中……在笔尖中。有一个视图（SUBVIEW）作为主视图（MAINVIEW）的子视图。并且有一个图像视图和按钮作为子视图视图（SUBVIEW）而不是主视图的子视图。
There is code in the tutorial (for the subview)
教程中有代码（针对子视图）
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];
but after applying this the image view appears in back of the SUBVIEW not in front of it as it was supposed to in the nib.. So how to get image view appear in front of the view..vimagepreview is the SUBVIEW
但是在应用此之后，图像视图出现在 SUBVIEW 的后面，而不是像它应该在笔尖中那样出现在它的前面。
采纳答案by Aaron Hayman
Try creating a new view programmatically, add the layer, and then add the view to the subview.
尝试以编程方式创建一个新视图，添加图层，然后将视图添加到子视图。
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
UIView *newView = [[UIView alloc] initWithFrame:SUBVIEW.bounds];
[newView.layer addSublayer: captureVideoPreviewLayer];
[SUBVIEW addSubview: newView];
That should make sure the layer is above the subview.
这应该确保该层位于子视图之上。
回答by Mrunal
I guess you require to bring your subview (image view container view) in front.
我猜你需要把你的子视图（图像视图容器视图）放在前面。
Check this out: bringSubViewToFront:
看看这个：带来SubViewToFront：
Its UIView class method.
它的 UIView 类方法。
Let me know whether this works for you or not
让我知道这是否适合您
回答by John Paul Manoza
This will work on both iOS7 and iOS8.
这将适用于 iOS7 和 iOS8。
[videoPreviewLayerParentView.layer insertSublayer:videoPreviewLayer atIndex:0];
[videoPreviewLayerParentView.layer insertSublayer:aboveView.layer atIndex:1];
回答by stumped
Try reordering the z-index:
尝试重新排序 z-index：
//subview to go infront
frontView.layer.zPosition = 100
//layer to go to back
backLayer.zPosition = 0
