adjustsFontSizeToFitWidth doesn't work properly UILabel

Question

I have a UILabel defined below :

let disclaimerLabel : TTTAttributedLabel = {
    let label = TTTAttributedLabel(frame: CGRectZero)
    label.textColor =  UIColor.whiteColor()
    label.font = UIFont.boldSystemFontOfSize(13)
    label.textAlignment = .Center
    label.numberOfLines = 1
    label.minimumScaleFactor = 0.01
    label.adjustsFontSizeToFitWidth = true
    label.text = "By logging in, you agree to our Privacy Policy and T&C."
    return label
}()

Now the problem is that on older phones such as iphone 4, the line of text does not fit within one line. I thought this would be solved by the label.adjustsFontSizeToFitWidth = true line, however instead of shrinking the text size appropriately, the label text appears like this : By logging in, you agree to our Privacy Policy... I cannot have this label have more than one line, therefore I cannot use numberofLines = 2 or label.lineBreakMode = NSLineBreakMode.ByTruncatingTail

It is an absolute necessity in this case that the whole text is visible in one line . How can I achieve this?

Answer 1

If your device is exactly iPhone 4 (so it runs iOS 7.0 or less), that's the point.

The property .adjustsFontSizeToFitWidth is available on iOS SDK 8.0 and later:

https://developer.apple.com/reference/uikit/uilabel/1620546-adjustsfontsizetofitwidth

If you need one line only for a label, use .minimumScaleFactor for ios lower than 8.0 instead.