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September 9, 2018 04:47
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MaterialTabBar.swift
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| // | |
| // MaterialTabBar.swift | |
| // | |
| // Created by Amir Daliri on 9/6/17. | |
| // Copyright © 2017 AmirDaliri. All rights reserved. | |
| // | |
| import UIKit | |
| protocol MaterialTabBarDelegate { | |
| func materialTabBar(_ materialTabBar: MaterialTabBar, willChangeToIndex index: Int) | |
| func materialTabBar(_ materialTabBar: MaterialTabBar, didChangeToIndex index: Int) | |
| } | |
| class MaterialTabBar: UIView { | |
| var items = [String]() { | |
| didSet { | |
| for button in buttons { | |
| button.removeFromSuperview() | |
| } | |
| buttons.removeAll() | |
| for (index, item) in items.enumerated() { | |
| let button = UIButton() | |
| button.translatesAutoresizingMaskIntoConstraints = false | |
| button.setTitleColor(.black, for: .normal) | |
| button.setTitleColor(tintColor, for: .selected) | |
| button.contentEdgeInsets = UIEdgeInsets(top: 4, left: 8, bottom: 4, right: 8) | |
| button.setTitle(item, for: .normal) | |
| button.setTitle(item, for: .selected) | |
| button.tag = index | |
| button.addTarget(self, action: #selector(itemSelected(_:)), for: .touchUpInside) | |
| button.titleLabel?.font = IranSans.regular.of(14) | |
| buttons.append(button) | |
| } | |
| addButtons() | |
| if items.count > 0, indicatorLine != nil { | |
| indicatorLine.isHidden = false | |
| } | |
| } | |
| } | |
| var selectedIndex = 0 { | |
| didSet { | |
| changeSelectedIndex(toIndex: selectedIndex) | |
| } | |
| } | |
| var isAnimationEnabled = true | |
| var useEqualWidths = false | |
| var delegate: MaterialTabBarDelegate? | |
| fileprivate var buttons = [UIButton]() | |
| fileprivate var scrollView: UIScrollView! | |
| fileprivate var contentView = UIView() | |
| fileprivate var indicatorLine: UIView! | |
| fileprivate var bottomBorder: UIView! | |
| fileprivate let indicatorLineHeight: CGFloat = 3 | |
| var indicatorLineLeadingConstraint: NSLayoutConstraint! | |
| fileprivate var indicatorLineWidthConstraint: NSLayoutConstraint! | |
| init(tintColor: UIColor) { | |
| super.init(frame: CGRect.zero) | |
| self.tintColor = tintColor | |
| setup() | |
| } | |
| override init(frame: CGRect) { | |
| super.init(frame: frame) | |
| setup() | |
| } | |
| required init?(coder aDecoder: NSCoder) { | |
| super.init(coder: aDecoder) | |
| setup() | |
| } | |
| override func layoutSubviews() { | |
| super.layoutSubviews() | |
| contentView.frame.size.height = frame.height | |
| indicatorLine.frame.origin.y = frame.height - indicatorLineHeight | |
| if contentView.frame.width < frame.width { | |
| scrollView.isScrollEnabled = true | |
| scrollView.contentOffset = CGPoint(x: -(frame.width - contentView.frame.width) / 2, y: 0) | |
| scrollView.isScrollEnabled = false | |
| } | |
| else { | |
| scrollView.isScrollEnabled = true | |
| } | |
| if useEqualWidths { | |
| for button in buttons { | |
| button.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width / CGFloat(buttons.count)).isActive = true | |
| } | |
| } | |
| } | |
| private func setup() { | |
| backgroundColor = .white | |
| scrollView = UIScrollView() | |
| scrollView.delegate = self | |
| scrollView.translatesAutoresizingMaskIntoConstraints = false | |
| scrollView.showsVerticalScrollIndicator = false | |
| scrollView.showsHorizontalScrollIndicator = false | |
| addSubview(scrollView) | |
| scrollView.topAnchor.constraint(equalTo: topAnchor).isActive = true | |
| scrollView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true | |
| scrollView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true | |
| scrollView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true | |
| contentView = UIView() | |
| scrollView.addSubview(contentView) | |
| indicatorLine = UIView() | |
| indicatorLine.translatesAutoresizingMaskIntoConstraints = false | |
| indicatorLine.backgroundColor = tintColor | |
| indicatorLine.isHidden = true | |
| contentView.addSubview(indicatorLine) | |
| indicatorLineLeadingConstraint = indicatorLine.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 0) | |
| indicatorLineLeadingConstraint.isActive = true | |
| indicatorLineWidthConstraint = indicatorLine.widthAnchor.constraint(equalToConstant: 64) | |
| indicatorLineWidthConstraint.isActive = true | |
| indicatorLine.heightAnchor.constraint(equalToConstant: indicatorLineHeight).isActive = true | |
| indicatorLine.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true | |
| addButtons() | |
| bottomBorder = UIView() | |
| bottomBorder.translatesAutoresizingMaskIntoConstraints = false | |
| bottomBorder.backgroundColor = #colorLiteral(red: 0.8666666667, green: 0.8666666667, blue: 0.8666666667, alpha: 1) | |
| addSubview(bottomBorder) | |
| bottomBorder.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true | |
| bottomBorder.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true | |
| bottomBorder.heightAnchor.constraint(equalToConstant: 1).isActive = true | |
| bottomBorder.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true | |
| } | |
| private func addButtons() { | |
| var totalWidth: CGFloat = 0 | |
| for i in 0 ..< buttons.count { | |
| let button = buttons[i] | |
| contentView.addSubview(button) | |
| button.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true | |
| button.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true | |
| if i > 0 { | |
| button.leadingAnchor.constraint(equalTo: buttons[i - 1].trailingAnchor).isActive = true | |
| } | |
| else { | |
| button.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true | |
| } | |
| button.sizeToFit() | |
| if i == 0 { | |
| indicatorLineWidthConstraint.constant = button.frame.width | |
| } | |
| totalWidth += button.frame.width | |
| } | |
| if useEqualWidths { | |
| totalWidth = UIScreen.main.bounds.width - 8 | |
| } | |
| if totalWidth < frame.width { | |
| addSubview(contentView) | |
| contentView.frame = CGRect(x: (frame.width - totalWidth) / 2, y: 0, width: totalWidth, height: 44) | |
| scrollView.isHidden = true | |
| } | |
| else { | |
| contentView.frame = CGRect(x: 0, y: 0, width: totalWidth, height: 44) | |
| scrollView.contentSize = contentView.frame.size | |
| scrollView.isHidden = false | |
| } | |
| if useEqualWidths { | |
| indicatorLineLeadingConstraint.constant = 0 | |
| indicatorLineWidthConstraint.constant = totalWidth / 2 | |
| } | |
| else if buttons.count > 0 { | |
| indicatorLineLeadingConstraint.constant = totalWidth - buttons[0].frame.origin.x - buttons[0].frame.width | |
| } | |
| setNeedsLayout() | |
| } | |
| @objc fileprivate func itemSelected(_ sender: UIButton) { | |
| delegate?.materialTabBar(self, willChangeToIndex: sender.tag) | |
| selectedIndex = sender.tag | |
| delegate?.materialTabBar(self, didChangeToIndex: selectedIndex) | |
| } | |
| public func changeSelectedIndex(toIndex index: Int) { | |
| guard buttons.count > index, index >= 0 else { | |
| return | |
| } | |
| let targetButton = buttons[index] | |
| self.indicatorLine.layer.removeAllAnimations() | |
| if !isRTL { | |
| indicatorLineLeadingConstraint.constant = targetButton.frame.origin.x | |
| } | |
| else { | |
| indicatorLineLeadingConstraint.constant = contentView.frame.width - targetButton.frame.origin.x - targetButton.frame.width | |
| } | |
| indicatorLineWidthConstraint.constant = targetButton.frame.width | |
| UIView.animate(withDuration: isAnimationEnabled ? 0.25 : 0) { | |
| self.contentView.layoutIfNeeded() | |
| } | |
| let rectToMakeVisible = CGRect(x: max(targetButton.frame.origin.x - 50, 0), y: targetButton.frame.origin.y, width: targetButton.frame.width + 100, height: targetButton.frame.height) | |
| scrollView.scrollRectToVisible(rectToMakeVisible, animated: isAnimationEnabled) | |
| for (i, button) in buttons.enumerated() { | |
| button.isSelected = i == index | |
| } | |
| } | |
| } | |
| extension MaterialTabBar: UIScrollViewDelegate { | |
| func scrollViewDidScroll(_ scrollView: UIScrollView) { | |
| if scrollView.contentOffset.y != 0 { | |
| scrollView.contentOffset.y = 0 | |
| } | |
| } | |
| } |
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