Resize textField Based On Content

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You have to use an UITextView instead of an UITextField.

Then, you can use the sizeThatFits method.

But first you have to know how high one line will be. You can get that information by using lineHeight:

var amountOfLinesToBeShown: CGFloat = 6
var maxHeight: CGFloat = yourTextview.font.lineHeight * amountOfLinesToBeShown

After that, just call the sizeThatFits method inside your viewDidLoad method and set the maxHeight (line * 6) as your textview height:

yourTextview.sizeThatFits(CGSizeMake(yourTextview.frame.size.width, maxHeight))

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