Random crash due nil init

[ppamorim]

Hi, I was testing my app on the simulator and this happened:

To start the showcase it's calling:

let showcase: MaterialShowcase = MaterialShowcase()
showcase.setTargetView(view: button)
showcase.show(completion: { [weak self] in
  //...
}

Version: 0.7.1

[quangctkm9207]

Do you think that the materialShowcase.show() function was called too early that the target view had not laid out in UI yet?
So, it was null at that time.

[ppamorim]

@quangctkm9207 button has been created and added as subview in the function loadView() by code and materialShowcase.show() was called in the viewDidAppear(_ animated: Bool) method. I know I know, very strange.

[quangctkm9207]

Yes. It is quite strange because it happened randomly.

[ppamorim]

@quangctkm9207 I think the only way to sort this out is to rewrite the instances and use UIView? instead of UIView!.

[quangctkm9207]

That would be a good suggestion.
Based on your tests, how often does the crash occur?

[AlexanderZubkov]

/// Sets a UITableViewCell as target
@objc public func setTargetView(tableViewCell: UITableViewCell) {
    targetView = tableViewCell.contentView
    // for tableViewCell, we do not need target holder (circle view)
    // therefore, set its radius = 0
    targetHolderRadius = 0
}

/// Sets a UICollectionViewCell as target
@objc public func setTargetView(collectionViewCell: UICollectionViewCell) {
    targetView = collectionViewCell
    // for collectionViewCell, we do not need target holder (circle view)
    // therefore, set its radius = 0
    targetHolderRadius = 0
}

[geclick]

Hey, i wanted to show the showcase on a UIBarButtonItem and i ran into this crash. The reason is here:

if let view = (barButtonItem.value(forKey: "view") as? UIView)?.subviews.first {
targetView = view
}

view cannot be casted to UIView so this fails and targetView never get initialized. I solved this by setting a custom view(UIButton) to the UIBarButtonItem