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UITextField - limit the length of the text not by the number of characters

Is there a way to limit the textbox but not the character count? I would like to stop being able to enter when the end of the field is reached. But since different symbols have different sizes, stopping at a certain count is not a solution. Something like "stop at the end of the line" would be ideal.

it doesn't work for me

UITextField maximum length

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2 answers


What you want to do is not calculate the maximum number of newline characters, calculate its width in points and compare it to the width you want.

[Swift]



func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    let combinedString = textField.attributedText!.mutableCopy() as NSMutableAttributedString
    combinedString.replaceCharactersInRange(range, withString: string)
    return combinedString.size().width > textField.bounds.size.width
}

You may need to edit the attributes so that they appear on the same line.

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Subscribe to controlTextDidChange

and calculate text size with

let s = NSString(string: <yourtext>)
let size = s.boundingRectWithSize(<#size: NSSize#>, options: <#NSStringDrawingOptions#>, attributes: <#[NSObject : AnyObject]?#>)


Now you can check if the text is too big.

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