//
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// EmptyDataSetView.swift
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// EmptyDataSet-Swift
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//
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// Created by YZF on 28/6/17.
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// Copyright © 2017年 Xiaoye. All rights reserved.
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//
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import Foundation
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import UIKit
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public class EmptyDataSetView: UIView {
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internal lazy var contentView: UIView = {
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let contentView = UIView()
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contentView.translatesAutoresizingMaskIntoConstraints = false
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contentView.backgroundColor = UIColor.clear
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contentView.isUserInteractionEnabled = true
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contentView.alpha = 0
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return contentView
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}()
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internal lazy var imageView: UIImageView = {
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let imageView = UIImageView()
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imageView.translatesAutoresizingMaskIntoConstraints = false
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imageView.backgroundColor = UIColor.clear
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imageView.contentMode = .scaleAspectFit
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imageView.isUserInteractionEnabled = false
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imageView.accessibilityIdentifier = "empty set background image"
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self.contentView.addSubview(imageView)
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return imageView
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}()
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internal lazy var titleLabel: UILabel = {
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let titleLabel = UILabel()
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titleLabel.translatesAutoresizingMaskIntoConstraints = false
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titleLabel.backgroundColor = UIColor.clear
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titleLabel.font = UIFont.systemFont(ofSize: 27.0)
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titleLabel.textColor = UIColor(white: 0.6, alpha: 1.0)
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titleLabel.textAlignment = .center
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titleLabel.lineBreakMode = .byWordWrapping
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titleLabel.numberOfLines = 0
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titleLabel.accessibilityIdentifier = "empty set title"
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self.contentView.addSubview(titleLabel)
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return titleLabel
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}()
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internal lazy var detailLabel: UILabel = {
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let detailLabel = UILabel()
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detailLabel.translatesAutoresizingMaskIntoConstraints = false
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detailLabel.backgroundColor = UIColor.clear
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detailLabel.font = UIFont.systemFont(ofSize: 17.0)
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detailLabel.textColor = UIColor(white: 0.6, alpha: 1.0)
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detailLabel.textAlignment = .center
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detailLabel.lineBreakMode = .byWordWrapping
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detailLabel.numberOfLines = 0
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detailLabel.accessibilityIdentifier = "empty set detail label"
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self.contentView.addSubview(detailLabel)
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return detailLabel
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}()
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internal lazy var button: UIButton = {
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let button = UIButton.init(type: .custom)
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button.translatesAutoresizingMaskIntoConstraints = false
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button.backgroundColor = UIColor.clear
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button.contentHorizontalAlignment = .center
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button.contentVerticalAlignment = .center
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button.accessibilityIdentifier = "empty set button"
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self.contentView.addSubview(button)
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return button
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}()
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private var canShowImage: Bool {
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return imageView.image != nil
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}
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private var canShowTitle: Bool {
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if let attributedText = titleLabel.attributedText {
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return attributedText.length > 0
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}
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return false
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}
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private var canShowDetail: Bool {
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if let attributedText = detailLabel.attributedText {
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return attributedText.length > 0
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}
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return false
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}
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private var canShowButton: Bool {
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if let attributedTitle = button.attributedTitle(for: .normal) {
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return attributedTitle.length > 0
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} else if let _ = button.image(for: .normal) {
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return true
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}
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return false
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}
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internal var customView: UIView? {
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willSet {
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if let customView = customView {
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customView.removeFromSuperview()
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}
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}
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didSet {
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if let customView = customView {
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customView.translatesAutoresizingMaskIntoConstraints = false
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self.addSubview(customView)
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}
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}
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}
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internal var fadeInOnDisplay = false
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internal var verticalOffset: CGFloat = 0
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internal var verticalSpace: CGFloat = 11
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internal var didTapContentViewHandle: (() -> Void)?
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internal var didTapDataButtonHandle: (() -> Void)?
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internal var willAppearHandle: (() -> Void)?
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internal var didAppearHandle: (() -> Void)?
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internal var willDisappearHandle: (() -> Void)?
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internal var didDisappearHandle: (() -> Void)?
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override init(frame: CGRect) {
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super.init(frame: frame)
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addSubview(contentView)
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}
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required public init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override public func didMoveToSuperview() {
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if let superviewBounds = superview?.bounds {
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frame = CGRect(x: 0, y: 0, width: superviewBounds.width, height: superviewBounds.height)
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}
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if fadeInOnDisplay {
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UIView.animate(withDuration: 0.25) {
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self.contentView.alpha = 1
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}
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} else {
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contentView.alpha = 1
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}
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}
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// MARK: - Action Methods
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internal func removeAllConstraints() {
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removeConstraints(constraints)
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contentView.removeConstraints(contentView.constraints)
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}
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internal func prepareForReuse() {
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titleLabel.text = nil
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detailLabel.text = nil
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imageView.image = nil
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button.setImage(nil, for: .normal)
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button.setImage(nil, for: .highlighted)
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button.setAttributedTitle(nil, for: .normal)
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button.setAttributedTitle(nil, for: .highlighted)
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button.setBackgroundImage(nil, for: .normal)
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button.setBackgroundImage(nil, for: .highlighted)
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customView = nil
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removeAllConstraints()
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}
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// MARK: - Auto-Layout Configuration
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internal func setupConstraints() {
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// First, configure the content view constaints
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// The content view must alway be centered to its superview
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let centerXConstraint = NSLayoutConstraint(item: contentView, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0.0)
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let centerYConstraint = NSLayoutConstraint(item: contentView, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0.0)
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self.addConstraints([centerXConstraint, centerYConstraint])
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self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[contentView]|", options: [], metrics: nil, views: ["contentView": contentView]))
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// When a custom offset is available, we adjust the vertical constraints' constants
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if (verticalOffset != 0 && constraints.count > 0) {
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centerYConstraint.constant = verticalOffset
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}
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if let customView = customView {
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let centerXConstraint = NSLayoutConstraint(item: customView, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0.0)
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let centerYConstraint = NSLayoutConstraint(item: customView, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0.0)
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let customViewHeight = customView.frame.height
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let customViewWidth = customView.frame.width
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var heightConstarint: NSLayoutConstraint!
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var widthConstarint: NSLayoutConstraint!
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if(customViewHeight == 0) {
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heightConstarint = NSLayoutConstraint(item: customView, attribute: .height, relatedBy: .lessThanOrEqual, toItem: self, attribute: .height, multiplier: 1, constant: 0.0)
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} else {
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heightConstarint = NSLayoutConstraint(item: customView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: customViewHeight)
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}
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if(customViewWidth == 0) {
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widthConstarint = NSLayoutConstraint(item: customView, attribute: .width, relatedBy: .lessThanOrEqual, toItem: self, attribute: .width, multiplier: 1, constant: 0.0)
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} else {
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widthConstarint = NSLayoutConstraint(item: customView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: customViewWidth)
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}
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// When a custom offset is available, we adjust the vertical constraints' constants
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if (verticalOffset != 0) {
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centerYConstraint.constant = verticalOffset
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}
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self.addConstraints([centerXConstraint, centerYConstraint])
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self.addConstraints([heightConstarint, widthConstarint])
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// contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[customView]|", options: [], metrics: nil, views: ["customView": customView]))
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// contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[customView]|", options: [], metrics: nil, views: ["customView": customView]))
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} else {
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let width = frame.width > 0 ? frame.width : UIScreen.main.bounds.width
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let padding = roundf(Float(width/16.0))
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let verticalSpace = self.verticalSpace // Default is 11 pts
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var subviewStrings: [String] = []
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var views: [String: UIView] = [:]
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let metrics = ["padding": padding]
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// Assign the image view's horizontal constraints
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if canShowImage {
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imageView.isHidden = false
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subviewStrings.append("imageView")
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views[subviewStrings.last!] = imageView
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contentView.addConstraint(NSLayoutConstraint.init(item: imageView, attribute: .centerX, relatedBy: .equal, toItem: contentView, attribute: .centerX, multiplier: 1.0, constant: 0.0))
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} else {
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imageView.isHidden = true
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}
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// Assign the title label's horizontal constraints
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if (canShowTitle) {
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titleLabel.isHidden = false
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subviewStrings.append("titleLabel")
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views[subviewStrings.last!] = titleLabel
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contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-(padding)-[titleLabel(>=0)]-(padding)-|", options: [], metrics: metrics, views: views))
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} else {
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titleLabel.isHidden = true
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}
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// Assign the detail label's horizontal constraints
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if (canShowDetail) {
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detailLabel.isHidden = false
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subviewStrings.append("detailLabel")
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views[subviewStrings.last!] = detailLabel
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contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-(padding)-[detailLabel(>=0)]-(padding)-|", options: [], metrics: metrics, views: views))
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} else {
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detailLabel.isHidden = true
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}
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// Assign the button's horizontal constraints
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if (canShowButton) {
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button.isHidden = false
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subviewStrings.append("button")
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views[subviewStrings.last!] = button
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contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-(padding)-[button(>=0)]-(padding)-|", options: [], metrics: metrics, views: views))
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} else {
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button.isHidden = true
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}
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var verticalFormat = String()
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// Build a dynamic string format for the vertical constraints, adding a margin between each element. Default is 11 pts.
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for i in 0 ..< subviewStrings.count {
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let string = subviewStrings[i]
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verticalFormat += "[\(string)]"
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if i < subviewStrings.count - 1 {
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verticalFormat += "-(\(verticalSpace))-"
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}
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}
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// Assign the vertical constraints to the content view
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if !verticalFormat.isEmpty {
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contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|\(verticalFormat)|", options: [], metrics: metrics, views: views))
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}
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}
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}
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}
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