Question

I followed a tutorial on taking pictures using AvFoundation Framework.. so i am not proficient in it.. thats one point.

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.

There is code in the tutorial (for the subview)

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

Answer 1

Try creating a new view programmatically, add the layer, and then add the view to the subview.

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
UIView *newView = [[UIView alloc] initWithFrame:SUBVIEW.bounds];
[newView.layer addSublayer: captureVideoPreviewLayer];
[SUBVIEW addSubview: newView];

这应当确保该层高于次调查。

Answer 2

我猜测,你要求把你的分观点(对集装箱的看法)放在前面。

Check this out: bringSubViewToFront:

Its UIView class method.

让我知道,这是否有利于你。

Answer 3

This will work on both iOS7 and iOS8.

[videoPreviewLayerParentView.layer insertSublayer:videoPreviewLayer atIndex:0];
[videoPreviewLayerParentView.layer insertSublayer:aboveView.layer atIndex:1];

Answer 4

重新排列z-index:

//subview to go infront
frontView.layer.zPosition = 100

//layer to go to back
backLayer.zPosition = 0

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