Swift inputAccessoryView override bug - ios

Question

I'm experiencing a weird bug with the appearance of my inputAccessoryView. While in the middle of a transition, it appears like so:
After the transition, it appears as it should:
I override the property like so:
override var inputAccessoryView: UIView! {
get {
if composeView == nil {
composeView = CommentComposeView(frame: CGRectMake(0, 0, 0, MinimumToolbarHeight - 0.5))
self.setupSignals()
}
return composeView
}
}
I'm wondering if anyone can point out any obvious flaw in what I'm doing or provide some more information on how to ensure my view appears as it should, before, during, and after transitions.
Thanks!
EDIT
Here's my CommentComposeView:
import UIKit
class CommentComposeView: UIToolbar {
var textView: SAMTextView!
var sendButton: UIButton!
private var didSetConstraints: Bool = false
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.initialize()
}
override init(frame: CGRect) {
super.init(frame: frame)
self.initialize()
}
private func initialize() {
textView = SAMTextView(frame: CGRectZero)
sendButton = UIButton.buttonWithType(.System) as UIButton
self.barStyle = .Black
self.translucent = true
textView.backgroundColor = UIColor.presentOffWhite()
textView.font = UIFont.presentLightMedium()
textView.layer.borderWidth = 0.5
textView.layer.cornerRadius = 5
textView.placeholder = "Comment"
textView.scrollsToTop = false
textView.textContainerInset = UIEdgeInsetsMake(4, 3, 3, 3)
textView.keyboardAppearance = .Dark
textView.keyboardType = .Twitter
self.addSubview(textView)
sendButton = UIButton.buttonWithType(.System) as UIButton
sendButton.enabled = false
sendButton.titleLabel!.font = UIFont.presentBoldLarge()
sendButton.setTitle("Send", forState: .Normal)
sendButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
sendButton.setTitleColor(UIColor.presentCyan(), forState: .Highlighted)
sendButton.setTitleColor(UIColor.presentLightGray(), forState: .Disabled)
sendButton.contentEdgeInsets = UIEdgeInsetsMake(6, 6, 6, 6)
self.addSubview(sendButton)
RAC(self.sendButton, "enabled") <~ self.textView.rac_textSignal()
.map { text in
return (text as NSString).length > 0
}
textView.setTranslatesAutoresizingMaskIntoConstraints(false)
sendButton.setTranslatesAutoresizingMaskIntoConstraints(false)
}
override func updateConstraints() {
super.updateConstraints()
if !didSetConstraints {
// TODO: Replace raw constraints with a friendlier looking DSL
self.addConstraint(
NSLayoutConstraint(item: textView, attribute: .Left, relatedBy: .Equal, toItem: self, attribute: .Left, multiplier: 1, constant: 8)
)
self.addConstraint(
NSLayoutConstraint(item: textView, attribute: .Top, relatedBy: .Equal, toItem: self, attribute: .Top, multiplier: 1, constant: 7.5)
)
self.addConstraint(
NSLayoutConstraint(item: textView, attribute: .Right, relatedBy: .Equal, toItem: sendButton, attribute: .Left, multiplier: 1, constant: -2)
)
self.addConstraint(
NSLayoutConstraint(item: textView, attribute: .Bottom, relatedBy: .Equal, toItem: self, attribute: .Bottom, multiplier: 1, constant: -8)
)
self.addConstraint(
NSLayoutConstraint(item: sendButton, attribute: .Right, relatedBy: .Equal, toItem: self, attribute: .Right, multiplier: 1, constant: 0)
)
self.addConstraint(
NSLayoutConstraint(item: sendButton, attribute: .Bottom, relatedBy: .Equal, toItem: self, attribute: .Bottom, multiplier: 1, constant: -4.5)
)
}
}
}

Answer 1

This is iOS8 issue with inputAccessoryView autolayout. Issue is that UIToolbar's subview of clas _UIToolbarBackground is not positioned properly during initial layout. Try to do next things:
Make CommentComposeView subclassing UIView, not UIToolbar, add instance of UIToolbar as subview.
Use autolayout masks (not actual constraints) inside your CommentComposeView
Override -layoutSubviews in your CommentComposeView like this:
- (void)layoutSubviews
{
[super layoutSubviews];
contentToolbar.frame = self.bounds;
sendButton.frame = CGRectMake(0.f, 0.f, 44.f, self.bounds.size.height);
textView.frame = CGRectMake(44.f, 0.f, self.bounds.size.width - 44.f, self.bounds.size.height);
}