UIExtensions.swift

import UIKit

public extension UIViewController {
    
    func setTitle(title:String) {
        self.title = title
    }
    
    func setEmptyBackArrow(){
        // удаляет текст возле кнопки назад
        let backButton = UIBarButtonItem(title: "", style: .plain, target: navigationController, action: nil)
        self.navigationItem.backBarButtonItem = backButton
    }
}


extension UINavigationItem {
    
    func setTitle(title:String, subtitle:String) {
        
        let one = UILabel()
        one.text = title
        one.font = UIFont.systemFont(ofSize: 17)
        one.sizeToFit()
        
        let two = UILabel()
        two.text = subtitle
        two.font = UIFont.systemFont(ofSize: 12)
        two.textAlignment = .center
        two.sizeToFit()
        
        let stackView = UIStackView(arrangedSubviews: [one, two])
        stackView.distribution = .equalCentering
        stackView.axis = .vertical
        
        let width = max(one.frame.size.width, two.frame.size.width)
        stackView.frame = CGRect(x: 0, y: 0, width: width, height: 35)
        
        one.sizeToFit()
        two.sizeToFit()
        
        self.titleView = stackView
    }
}

extension UITableView {
    
    func setBackgroundView(title: String?, message: String?) {
        let emptyView = UIView(frame: CGRect(x: self.center.x, y: self.center.y, width: self.bounds.size.width, height: self.bounds.size.height))
        let titleLabel = UILabel()
        let messageLabel = UILabel()
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        messageLabel.translatesAutoresizingMaskIntoConstraints = false
        titleLabel.textColor = UIColor.black
        titleLabel.font = UIFont(name: "HelveticaNeue-Bold", size: 18)
        messageLabel.textColor = UIColor.lightGray
        messageLabel.font = UIFont(name: "HelveticaNeue-Regular", size: 17)
        emptyView.addSubview(titleLabel)
        emptyView.addSubview(messageLabel)
        titleLabel.centerYAnchor.constraint(equalTo: emptyView.centerYAnchor).isActive = true
        titleLabel.centerXAnchor.constraint(equalTo: emptyView.centerXAnchor).isActive = true
        messageLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 20).isActive = true
        messageLabel.leftAnchor.constraint(equalTo: emptyView.leftAnchor, constant: 20).isActive = true
        messageLabel.rightAnchor.constraint(equalTo: emptyView.rightAnchor, constant: -20).isActive = true
        titleLabel.text = title
        messageLabel.text = message
        messageLabel.numberOfLines = 0
        messageLabel.textAlignment = .center
        // The only tricky part is here:
        self.backgroundView = emptyView
        self.separatorStyle = .none
    }
    
    func restore() {
        self.backgroundView = nil
        self.separatorStyle = .singleLine
    }
}

extension UITableViewCell{
    
    class var nib:UINib {
        return UINib(nibName: self.className, bundle: nil)
    }
    
    class var identifier: String {
        return String(describing: self)
    }
}

extension UIImageView {
    
    func setRounded() {
        self.layer.cornerRadius = self.frame.width / 2
        self.layer.masksToBounds = true
    }
}

extension UIImage {
    
    func imageWithColor(color1: UIColor) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
        color1.setFill()
        
        let context = UIGraphicsGetCurrentContext()
        context?.translateBy(x: 0, y: self.size.height)
        context?.scaleBy(x: 1.0, y: -1.0)
        context?.setBlendMode(CGBlendMode.normal)
        
        let rect = CGRect(origin: .zero, size: CGSize(width: self.size.width, height: self.size.height))
        context?.clip(to: rect, mask: self.cgImage!)
        context?.fill(rect)
        
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        return newImage!
    }
}

extension UIButton {
    
    func setCornerRadius(radius: CGFloat) {
        self.layer.cornerRadius = radius
    }
    
}


extension UIRefreshControl {
    func beginRefreshingManually() {
        self.tintColor = Colors.YELLOW_ACCENT
        tintColorDidChange()
        if let scrollView = superview as? UIScrollView {
            scrollView.setContentOffset(CGPoint(x: 0, y:scrollView.contentOffset.y - frame.height), animated: true)
        }
        beginRefreshing()
    }
}