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import PlaygroundSupport
import UIKit

class TableViewManager: NSObject, UITableViewDataSource, UITableViewDelegate {
    
    weak var tableView: UITableView?
    
    var strings = ["a", "b", "c", "d","e", "f", "g", "h","i", "j", "k", "dl","am", "bn", "co", "dp","aq", "br", "cs", "dt","au", "bv", "cw", "dx","ay", "bz", "caa", "dbb","acc", "bdd", "cee", "dff","agg", "bhh", "cii", "djj","akk", "bll", "cmm", "dnn","aoo", "bpp", "cqq", "zrr"]
    
    func add(data: [String]) {

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Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

All hex value from 100% to 0% alpha:

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// No Security

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

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@propertyWrapper
struct UserDefault<T> {
    let key: String
    let defaultValue: T

    init(_ key: String, defaultValue: T) {
        self.key = key
        self.defaultValue = defaultValue
    }

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class MyView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        fromNib()
    }
    
    init() {
        super.init(frame: CGRect.zero)
        fromNib()
    }

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private var __maxLengthsForTextField = [UITextField: Int]()
extension UITextField {
    //https://stackoverflow.com/a/43099816/3110026
    @IBInspectable var maxLength: Int {
        get {
            guard let l = __maxLengthsForTextField[self] else {
                return 150 // (global default-limit. or just, Int.max)
            }
            return l
        }

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private var __maxLengthsForTextView = [UITextView: Int]()
private var kAssociationKeyMaxLengthTextView: Int = 0

extension UITextView:UITextViewDelegate {
    @IBInspectable var maxLength: Int {
        get {
            if let length = objc_getAssociatedObject(self, &kAssociationKeyMaxLengthTextView) as? Int {
                return length
            } else {
                return Int.max

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extension UITableView {
    func setEmptyMessage(_ message: String) {
        let messageLabel = UILabel(frame: CGRect(x: 0, y: 0, width: self.bounds.size.width, height: self.bounds.size.height))
        messageLabel.text = message
        messageLabel.textColor = .black
        messageLabel.numberOfLines = 0;
        messageLabel.textAlignment = .center;
        messageLabel.font = UIFont.preferredFont(forTextStyle: .title3)
        messageLabel.sizeToFit()

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extension UIView {
    func addSubviewsUsingAutoLayout(_ views: UIView ...) {
        subviews.forEach {
            self.addSubview($0)
            $0.translatesAutoresizingMaskIntoConstraints = false
        }
    }
}

@objc extension NSLayoutAnchor {

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@propertyWrapper
struct Trimmed {
    private(set) var value: String?
    var wrappedValue: String? {
        get {
            return value
        }
        set {
            value = newValue?.trimmingCharacters(in: .whitespacesAndNewlines)
        }