Autolayout

autolayout.swift

override init(reuseIdentifier: String?) {
    ...
    // arrowLabel must have fixed width and height
    arrowLabel.widthAnchor.constraintEqualToConstant(12).active = true
    arrowLabel.heightAnchor.constraintEqualToConstant(12).active = true
    titleLabel.translatesAutoresizingMaskIntoConstraints = false
    arrowLabel.translatesAutoresizingMaskIntoConstraints = false
}
override func layoutSubviews() {
    super.layoutSubviews()
    ...
    let views = [
        "titleLabel" : titleLabel,
        "arrowLabel" : arrowLabel,
    ]
    contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
        "H:|-20-[titleLabel]-[arrowLabel]-20-|",
        options: [],
        metrics: nil,
        views: views
    ))
    contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
        "V:|-[titleLabel]-|",
        options: [],
        metrics: nil,
        views: views
    ))
    contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
        "V:|-[arrowLabel]-|",
        options: [],
        metrics: nil,
        views: views
    ))
}