Using a custom font in a UITextField causes it to shift slightly when accessed — is there a fix?

Question

I have a custom font in a UITextField, and I\'ve noticed that when it\'s accessed (when the keyboard appears), the text shifts down by a very small amount -- maybe

Answer 1

Unfortunately none of the answers worked for me.

@blackjacx answer worked but only sometimes :(

I started out debugging and here is what I've discovered:

1 - The real problem seems to be with a private subview of UITextField of type UIFieldEditorContentView

Below you can see that the y of it subview is not the same of the UITextField itself:

After realizing it I came out with the following workaround:

override func layoutSubviews() {
    super.layoutSubviews()
    fixMisplacedEditorContentView()
}

func fixMisplacedEditorContentView() {
    if #available(iOS 10, *) {
        for view in subviews {
            if view.bounds.origin.y < 0 {
                view.bounds.origin = CGPoint(x: view.bounds.origin.x, y: 0)
            }
        }
    }
}

You will need to subclass UITextField and override layoutSubviews to add the ability to manually set to 0 the y of any subview that is set to a negative value. As this problem doesn't occur with iOS 9 our below I added a check to do the workaround only when it is on iOS 10.

The result you can see below:

2 - This workaround doesn't work if the user choose to select a subrange of the text (selectAll works fine)

Since the selection of the text is not a must have for my app I rather disable it. In order to do that you can use the following code (Swift 3):

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    if #available(iOS 10, *) {
        if action == #selector(UIResponderStandardEditActions.select(_:)) {
            return false
        }
    }

    return super.canPerformAction(action, withSender: sender)
}