EmptyDataSet

EmptyDataSet.swift

import UIKit

class EmptyDataSet: UIView {
    
    private(set) var parentView: UIView!
    private(set) var titleLabel: UILabel!
    private(set) var descriptionLabel: UILabel!
    private(set) var imageView: UIImageView!
    private(set) var button: UIButton!
    
    private var imageAnimation: CABasicAnimation {
        let animation = CABasicAnimation(keyPath: "transform")
        animation.fromValue = NSValue(caTransform3D: CATransform3DIdentity)
        animation.toValue = NSValue(caTransform3D: CATransform3DMakeRotation(CGFloat(Double.pi/2), 0.0, 0.0, 1.0))
        animation.duration = 0.25
        animation.isCumulative = true
        animation.repeatCount = MAXFLOAT
        animation.isRemovedOnCompletion = false
        return animation
    }
    
    var margin: CGFloat = 16.0
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        self.backgroundColor = .white
        
        parentView = UIView()
        parentView.translatesAutoresizingMaskIntoConstraints = false
        
        addSubview(parentView)
        parentView.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
        parentView.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    func setProgress(title: String?, description: String?) {
        var topConstraint: NSLayoutYAxisAnchor?
        
        parentView.subviews.forEach { $0.removeFromSuperview() }
        
        // Add Image
        imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.image = UIImage(named: "Oval")
        parentView.addSubview(imageView)
        imageView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
        imageView.topAnchor.constraint(equalTo: parentView.topAnchor, constant: 0).isActive = true
        imageView.layer.add(imageAnimation, forKey: nil)
        
        topConstraint = imageView.bottomAnchor
        
        if let title = title {
            // Add Title
            titleLabel = UILabel()
            titleLabel.translatesAutoresizingMaskIntoConstraints = false
            titleLabel.textColor = .black
            titleLabel.font = UIFont.boldSystemFont(ofSize: 24)
            titleLabel.text = title
            parentView.addSubview(titleLabel)
            titleLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            titleLabel.topAnchor.constraint(equalTo: topConstraint!, constant: margin).isActive = true
            
            topConstraint = titleLabel.bottomAnchor
        }
        
        if let description = description {
            // Add Description
            descriptionLabel = UILabel()
            descriptionLabel.translatesAutoresizingMaskIntoConstraints = false
            descriptionLabel.textColor = .black
            descriptionLabel.text = description
            parentView.addSubview(descriptionLabel)
            descriptionLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            descriptionLabel.topAnchor.constraint(equalTo: topConstraint!, constant: margin).isActive = true
            
            topConstraint = descriptionLabel.bottomAnchor
        }
        
        parentView.bottomAnchor.constraint(equalTo: topConstraint!).isActive = true
        
    }
    
    func setNoData(image: UIImage?, title: String?, description: String?) {
        var topConstraint = parentView.topAnchor
        
        parentView.subviews.forEach { $0.removeFromSuperview() }
        
        if let image = image {
            // Add Image
            imageView = UIImageView()
            imageView.translatesAutoresizingMaskIntoConstraints = false
            imageView.image = image
            parentView.addSubview(imageView)
            imageView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            imageView.topAnchor.constraint(equalTo: topConstraint, constant: 0).isActive = true
            topConstraint = imageView.bottomAnchor
        }
        
        if let text = title {
            // Add Title
            titleLabel = UILabel()
            titleLabel.translatesAutoresizingMaskIntoConstraints = false
            titleLabel.textColor = .black
            titleLabel.font = UIFont.boldSystemFont(ofSize: 24)
            titleLabel.text = text
            parentView.addSubview(titleLabel)
            titleLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            titleLabel.topAnchor.constraint(equalTo: topConstraint, constant: margin).isActive = true
            topConstraint = titleLabel.bottomAnchor
        }
        
        if let text = description {
            // Add Description
            descriptionLabel = UILabel()
            descriptionLabel.translatesAutoresizingMaskIntoConstraints = false
            descriptionLabel.textColor = .black
            descriptionLabel.text = text
            parentView.addSubview(descriptionLabel)
            descriptionLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            descriptionLabel.topAnchor.constraint(equalTo: topConstraint, constant: margin).isActive = true
            
            topConstraint = descriptionLabel.bottomAnchor
        }
        
        parentView.bottomAnchor.constraint(equalTo: topConstraint).isActive = true
    }
    
    func setFailed(title: String?, description: String?, buttonTitle: String?, action: ()->()) {
        var topConstraint = parentView.topAnchor
        parentView.subviews.forEach { $0.removeFromSuperview() }
        
        if let text = title {
            // Add Title
            titleLabel = UILabel()
            titleLabel.translatesAutoresizingMaskIntoConstraints = false
            titleLabel.textColor = .black
            titleLabel.font = UIFont.boldSystemFont(ofSize: 24)
            titleLabel.text = text
            parentView.addSubview(titleLabel)
            titleLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            titleLabel.topAnchor.constraint(equalTo: topConstraint, constant: margin).isActive = true
            topConstraint = titleLabel.bottomAnchor
        }
        
        if let text = description {
            // Add Description
            descriptionLabel = UILabel()
            descriptionLabel.translatesAutoresizingMaskIntoConstraints = false
            descriptionLabel.textColor = .black
            descriptionLabel.text = text
            parentView.addSubview(descriptionLabel)
            descriptionLabel.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            descriptionLabel.topAnchor.constraint(equalTo: topConstraint, constant: margin).isActive = true
            topConstraint = descriptionLabel.bottomAnchor
        }
        
        if let text = buttonTitle {
            button = UIButton()
            button.backgroundColor = .black
            
            button.layer.masksToBounds = true
            button.setTitle(text, for: .normal)
            button.setTitleColor(.white, for: .normal)
            button.translatesAutoresizingMaskIntoConstraints = false
            parentView.addSubview(button)
            button.centerXAnchor.constraint(equalTo: parentView.centerXAnchor, constant: 0).isActive = true
            button.topAnchor.constraint(equalTo: topConstraint, constant: margin).isActive = true
            button.contentEdgeInsets = UIEdgeInsets(top: 10, left: 36, bottom: 10, right: 36)
            topConstraint = button.bottomAnchor
            button.layoutIfNeeded()
            button.layer.cornerRadius = button.frame.size.height/2
        }
        
        parentView.bottomAnchor.constraint(equalTo: topConstraint).isActive = true
    }
}

let emptyDataSet = EmptyDataSet()
emptyDataSet.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(emptyDataSet)
        
emptyDataSet.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0).isActive = true
emptyDataSet.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0).isActive = true
emptyDataSet.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: 0).isActive = true
emptyDataSet.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 0).isActive = true
        
// emptyDataSet.setProgress(title: "Loading Projects", description: "Please wait while we load the projects....")
// emptyDataSet.setNoData(image: UIImage(named: "Oval")!, title: "No Projects", description: "Click the plus button to add projects.")
emptyDataSet.setFailed(title: "Failed", description: "Failed to get the list data.", buttonTitle: "Retry") { }