FontPickerTextField.swift

import UIKit

public class FontPickerTextField: PickerTextField {
    public required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        for familyName in UIFont.familyNames() {
            self.choices.appendContentsOf(UIFont.fontNamesForFamilyName(familyName))
        }
        self.choices = self.choices.sort()
        self.text = self.choices[0]
        self.layer.shadowRadius = 1.0
        self.onSelected = self._onSelected
    }
    public var onFontSelected:((font:UIFont)->Void)? = nil
    public func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return 44.0
    }
    public func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
        if let timer = self._selectedTimer {
            timer.invalidate()
            self._selectedTimer = nil
        }
        let frame = CGRect(x: 0, y: 0, width: pickerView.frame.size.width, height: 44.0)
        var aView:UIView
        if let view = view {
            aView = view
        }
        else {
            aView = UIView(frame:frame)
        }
        let label = UILabel(frame: frame)
        if let font = UIFont(name: self.choices[row], size: UIFont.systemFontSize()) {
            label.attributedText = NSAttributedString(string: self.choices[row], attributes: [NSFontAttributeName:font])
        }
        else {
            label.text = self.choices[row]
        }
        label.textAlignment = NSTextAlignment.Center
        aView.addSubview(label)
        return aView
    }
    @objc private func _onSelected(row: Int) {
        self.font = UIFont(name: self.choices[row], size: UIFont.systemFontSize())
        
        if let selected = self.onFontSelected {
            if let font = UIFont(name: self.choices[row], size: UIFont.systemFontSize()) {
                selected(font: font)
            }
            else {
                selected(font: UIFont())
            }
        }
    }
    public var currentFont:UIFont {
        get {
            if let font = UIFont(name: self.choices[self.currentRow], size: UIFont.systemFontSize()) {
                return font
            }
            else {
                return UIFont()
            }
        }
    }
}