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swift/MaterialTextField/MaterialTextField.swift
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// | |
// MaterialTextField.swift | |
// | |
// Created by Andrey Yarosh on 07/08/2017. | |
// https://github.com/bingosoft/swift/tree/master/MaterialTextField | |
// | |
import Foundation | |
import UIKit | |
@IBDesignable | |
class MaterialTextField : UITextField | |
{ | |
private var placeHolderLabel = UILabel(); | |
private var underLineView = UIView(); | |
private (set) var placeholderMinimized = false { | |
didSet { | |
guard (oldValue != placeholderMinimized) else { return } | |
let transform: CGAffineTransform! | |
if (placeholderMinimized) { | |
let k: CGFloat = 0.7; | |
let dx = placeHolderLabel.frame.width * (1 - k) / 2; | |
transform = CGAffineTransform(translationX: -dx, y: -20).scaledBy(x: k, y: k); | |
} else { | |
transform = .identity; | |
} | |
UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut, animations: { | |
self.placeHolderLabel.layer.setAffineTransform(transform); | |
}) | |
} | |
} | |
private var isActive = false; | |
override var text: String? { | |
didSet { | |
updateState(); | |
} | |
} | |
@IBInspectable override var placeholder: String! { | |
set { | |
placeHolderLabel.text = newValue; | |
placeHolderLabel.sizeToFit(); | |
} | |
get { | |
return placeHolderLabel.text | |
} | |
} | |
@IBInspectable var placeholderColor: UIColor! { | |
didSet { | |
placeHolderLabel.textColor = placeholderColor; | |
} | |
} | |
required init?(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder); | |
clipsToBounds = false; | |
tintColor = textColor; | |
placeholderColor = .gray; | |
addSubview(placeHolderLabel); | |
placeHolderLabel.translatesAutoresizingMaskIntoConstraints = false; | |
placeHolderLabel.font = font; | |
addConstraint(placeHolderLabel.leadingAnchor.constraint(equalTo: leadingAnchor)); | |
addConstraint(placeHolderLabel.centerYAnchor.constraint(equalTo: centerYAnchor)); | |
addSubview(underLineView); | |
underLineView.translatesAutoresizingMaskIntoConstraints = false; | |
underLineView.backgroundColor = UIColor.white.withAlphaComponent(0.6); | |
var c = NSLayoutConstraint.constraints(withVisualFormat: "|[v]|", options: .alignAllFirstBaseline, metrics: nil, views: ["v": underLineView]) | |
addConstraints(c); | |
c = NSLayoutConstraint.constraints(withVisualFormat: "V:[v(2)]-(-3)-|", options: .alignAllFirstBaseline, metrics: nil, views: ["v": underLineView]) | |
addConstraints(c); | |
addTarget(self, action: #selector(didStartEditing), for: .editingDidBegin); | |
addTarget(self, action: #selector(didEndEditing), for: .editingDidEnd); | |
addTarget(self, action: #selector(editingChanged), for: .editingChanged); | |
} | |
@objc func didStartEditing() { | |
UIView.animate(withDuration: 0.3) { | |
self.underLineView.backgroundColor = UIColor.white; | |
} | |
isActive = true; | |
updateState(); | |
} | |
@objc func didEndEditing() { | |
UIView.animate(withDuration: 0.3) { | |
self.underLineView.backgroundColor = UIColor.white.withAlphaComponent(0.6); | |
} | |
isActive = false; | |
updateState(); | |
} | |
@objc func editingChanged() { | |
updateState(); | |
} | |
func updateState() { | |
placeholderMinimized = isActive || !text!.isEmpty | |
} | |
} |