CODEWITHSUNDEEP
swiftuikitreplaykit
vpoltave
vpoltave

Reputation: 1770

RPSystemBroadcastPickerView subviews odd behaviour when initial size not set

I have view with RPSystemBroadcastPickerView view. In documentation apple shows example with assigning frame to this view like so:

https://developer.apple.com/documentation/replaykit/rpsystembroadcastpickerview?language=objc

When set frame + constraints, works as expected:

picker = RPSystemBroadcastPickerView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))

but if i do initialize RPSystemBroadcastPickerView like this:

picker = RPSystemBroadcastPickerView()

subviews doesn't display properly.

enter image description here

Constraints for both cases:

picker.translatesAutoresizingMaskIntoConstraints = false

pickerViewContainerView.addSubview(picker)
picker.widthAnchor.constraint(equalTo: pickerViewContainerView.widthAnchor).isActive = true
picker.heightAnchor.constraint(equalTo: pickerViewContainerView.heightAnchor).isActive = true
picker.leadingAnchor.constraint(equalTo: pickerViewContainerView.leadingAnchor).isActive = true
picker.topAnchor.constraint(equalTo: pickerViewContainerView.topAnchor).isActive = true

Do i have to set initial frame for this view? Because usually if you create and position view using constraints you don't have to assign initial frame.

Can somebody explain this behavior please?

Thanks.

Upvotes: 0

Views: 405

Answers (1)

Nandish
Nandish

Reputation: 1177

Yes, you have to set the initial frame. You can check the width and height when you instantiate without initial frame.

picker = RPSystemBroadcastPickerView()
print("Height : \(picker.frame.height)")   // this will print as 0.0
print("Width : \(picker.frame.width)")     // this will print as 0.0

Since, the picker view is of height and width 0.0 x 0.0, it is not visible and is not working

With the initial frame the width and height prints 50.0 x 50.0 and visible.

picker = RPSystemBroadcastPickerView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
print("Height : \(picker.frame.height)")   // this will print as 50.0
print("Width : \(picker.frame.width)")     // this will print as 50.0

That is why in the Apple Developer Documentation they suggested to use initial frame.

Upvotes: 1

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