label showing top of screen instead of being on the inputAccessoryView - swift

Question

Here is my code:
var messageView : UITextView = {
var textView = UITextView()
textView.text = " Add your message here"
textView.textColor = UIColor.lightGrayColor()
textView.translatesAutoresizingMaskIntoConstraints = false
textView.backgroundColor = UIColor.lightGrayColor()
textView.layer.cornerRadius = 3
textView.clipsToBounds = true
textView.keyboardAppearance = .Dark
textView.layer.borderWidth = 1.0
textView.layer.borderColor = UIColor.lightGrayColor()
textView.autocorrectionType = .no
// MARK: Setup accesorryView
let label = UILabel()
label.text = "You have a 100 character limit"
label.translatesAutoresizingMaskIntoConstraints = false
let accessoryView = UIView(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, 44))
accessoryView.backgroundColor = UIColor.redColor()
accessoryView.addSubview(label)
accessoryView.leadingAnchor.constraintEqualToAnchor(label.leadingAnchor, constant: 18)
accessoryView.centerYAnchor.constraintEqualToAnchor(label.centerYAnchor)
textView.inputAccessoryView = accessoryView
return textView
}()
I'm trying to add an inputAccessoryView to my TextView's keyboard.
My inputAccessoryView must have a label saying "You have a 100 character limit"...
But my current result is as:
The text in the blue...is exactly the label I want to be in the inputAccessoryView, but it's on the top of my screen...

Answer 1

You need to set translatesAutoresizingMaskIntoConstraints on the label to false and isActive to true on the constraints. Basically your constrains code should look like this:
accessoryView.leadingAnchor.constraintEqualToAnchor(label.leadingAnchor, constant: 18).isActive = true
accessoryView.centerYAnchor.constraintEqualToAnchor(label.centerYAnchor).isActive = true

Answer 2

As per my understanding, try this:
Swift 3
let accessoryView = UIView()
let label = UILabel()
let counterLabel = UILabel()//This is the counter label
label.text = "You have a 100 character limit"
counterLabel.text = "100"
accessoryView.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 44)
accessoryView.backgroundColor = UIColor.red
accessoryView.addSubview(label)
accessoryView.addSubview(counterLabel)
// to setup contraint set below property to false.
label.translatesAutoresizingMaskIntoConstraints = false
counterLabel.translatesAutoresizingMaskIntoConstraints = false
//label constrint with 0 padding from left side. To change padding from left and right side, change the constant value.
accessoryView.leadingAnchor.constraint(equalTo: label.leadingAnchor, constant: 0).isActive = true
accessoryView.centerYAnchor.constraint(equalTo: label.centerYAnchor).isActive = true
//counterl=Label constrint with 0 padding from right side
accessoryView.trailingAnchor.constraint(equalTo:counterLabel.trailingAnchor, constant: 0).isActive = true
accessoryView.centerYAnchor.constraint(equalTo: counterLabel.centerYAnchor).isActive = true
textView.inputAccessoryView = accessoryView