ios - Visual Format Language で UITextField の addConstraints を実行すると、Swift でエラーが発生します

Question

UITextField を UITableCell に追加し、幅と高さの両方を 100% に設定します。

私の迅速なコード:

nameTextField.translatesAutoresizingMaskIntoConstraints = false

addSubview( nameTextField )    

let views = [
    "name" : nameTextField
];

let widthLayoutConstraint = NSLayoutConstraint.constraintsWithVisualFormat( "H:|-[name]-|", options: [], metrics: nil, views: views )
nameTextField.addConstraints( widthLayoutConstraint )
let heightLayoutConstraint = NSLayoutConstraint.constraintsWithVisualFormat( "V:|-[name]-|", options: [], metrics: nil, views: views )
nameTextField.addConstraints( heightLayoutConstraint )

テーブルが表示されている間に、次のエラーメッセージが表示されました。

2016-07-31 19:16:43.027 NOIB[40193:1889520] *** Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to install constraint on view.  Does the constraint reference something from outside the subtree of the view?  That's illegal. constraint:<NSLayoutConstraint:0x7ffbfa70f480 UITextField:0x7ffbfa41dff0.leading == NOIB.NameCell:0x7ffbfa41da10'NameCell'.leadingMargin> view:<UITextField: 0x7ffbfa41dff0; frame = (0 0; 0 0); text = ''; clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x7ffbfa41e5c0>>'