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May 15, 2018 06:34
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DropDown
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| // | |
| // DropdownAlert.swift | |
| // Pods | |
| // | |
| // Created by Brendan Conron on 5/22/16. | |
| // | |
| // | |
| import UIKit | |
| import pop | |
| /// Inspired by: https://github.com/cwRichardKim/RKDropdownAlert | |
| /// but that wasn't written in swift so... | |
| /// Plus, it's powered by pop! | |
| open class DropdownAlert: UIView { | |
| // MARK: - Animation | |
| /** | |
| Animation types the dropdown can be presented with. | |
| - Basic: Basic, simple animation. | |
| - Spring: Spring animation. | |
| - Custom: Custom animation. | |
| */ | |
| public enum AnimationType { | |
| case basic(timingFunction: CAMediaTimingFunction) | |
| case spring(bounce: CGFloat, speed: CGFloat) | |
| case custom(POPPropertyAnimation) | |
| } | |
| // MARK: - Views | |
| /// Alert title label. | |
| fileprivate lazy var titleLabel: UILabel = { | |
| let label = UILabel() | |
| label.textAlignment = .center | |
| label.translatesAutoresizingMaskIntoConstraints = false | |
| return label | |
| }() | |
| /// Alert message label. | |
| fileprivate lazy var messageLabel: UILabel = { | |
| let label = UILabel() | |
| label.textAlignment = .center | |
| label.translatesAutoresizingMaskIntoConstraints = false | |
| return label | |
| }() | |
| // MARK: - Defaults | |
| /** | |
| Class defaults. | |
| */ | |
| fileprivate struct Defaults { | |
| static var BackgroundColor = UIColor.white | |
| static var TextColor = UIColor.black | |
| static var Title = "Default Title" | |
| static var Message = "Default message!" | |
| static var AnimationDuration: Double = 0.25 | |
| static var Duration: Double = 2 | |
| static var Height: CGFloat = 90 | |
| static var TitleFont: UIFont = UIFont(name: "SourceSansPro-Semibold", size: Defaults.FontSize)! | |
| static var MessageFont: UIFont = UIFont(name: "SourceSansPro-Regular", size: Defaults.FontSize)! | |
| static var FontSize: CGFloat = 14 { | |
| didSet { | |
| TitleFont = TitleFont.withSize(FontSize) | |
| MessageFont = MessageFont.withSize(FontSize) | |
| } | |
| } | |
| } | |
| // MARK: - Initialization | |
| convenience public init() { | |
| self.init(frame: CGRect.zero) | |
| } | |
| override public init(frame: CGRect) { | |
| super.init(frame: frame) | |
| self.commonInit() | |
| } | |
| required public init?(coder aDecoder: NSCoder) { | |
| super.init(coder: aDecoder) | |
| self.commonInit() | |
| } | |
| } | |
| public extension DropdownAlert { | |
| /** | |
| Show the dropdown alert. | |
| - parameter animationType: The kind of animation that will be shown. | |
| - parameter title: Dropdown title. | |
| - parameter message: Dropdown message. | |
| - parameter backgroundColor: Background color of the dropdown. | |
| - parameter textColor: Text color of the dropdown. | |
| - parameter duration: How long the dropdown will be shown before it's automatically dismissmed. | |
| */ | |
| class func showWithAnimation(_ animationType: AnimationType = .basic(timingFunction: CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)), | |
| title: String = Defaults.Title, | |
| message: String = Defaults.Message, | |
| backgroundColor: UIColor = Defaults.BackgroundColor, | |
| textColor: UIColor = Defaults.TextColor, | |
| duration: Double = Defaults.Duration) { | |
| // class func showWithAnimation(_ animationType: AnimationType = .basic(timingFunction: CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)), | |
| // title: String = "Default Title", | |
| // message: String = "Default message!", | |
| // backgroundColor: UIColor = UIColor.white, | |
| // textColor: UIColor = UIColor.black, | |
| // duration: Double = 2) { | |
| // Ensure that everything happens on the main queue | |
| DispatchQueue.main.async { | |
| let windows = UIApplication.shared.windows.filter { $0.windowLevel == UIWindowLevelNormal && !$0.isHidden } | |
| guard let window = windows.first else { | |
| return | |
| } | |
| let dropdown = DropdownAlert() | |
| dropdown.translatesAutoresizingMaskIntoConstraints = false | |
| dropdown.titleLabel.text = title | |
| dropdown.titleLabel.sizeToFit() | |
| dropdown.messageLabel.text = message | |
| dropdown.titleLabel.textColor = textColor | |
| dropdown.messageLabel.textColor = textColor | |
| dropdown.backgroundColor = backgroundColor | |
| // Construct a padding view that will cover the top of the dropdown in the case of a spring animation where it bounces past it's bounds | |
| let paddingView = UIView() | |
| paddingView.backgroundColor = backgroundColor | |
| paddingView.translatesAutoresizingMaskIntoConstraints = false | |
| window.addSubview(dropdown) | |
| window.addSubview(paddingView) | |
| // Constraint that'll be animated | |
| let animatedConstraint = NSLayoutConstraint(item: dropdown, attribute: .bottom, relatedBy: .equal, toItem: window, attribute: .top, multiplier: 1, constant: 0) | |
| // Add the drop downconstraint | |
| window.addConstraint(NSLayoutConstraint(item: dropdown, attribute: .left, relatedBy: .equal, toItem: window, attribute: .left, multiplier: 1, constant: 0)) | |
| window.addConstraint(NSLayoutConstraint(item: dropdown, attribute: .right, relatedBy: .equal, toItem: window, attribute: .right, multiplier: 1, constant: 0)) | |
| window.addConstraint(NSLayoutConstraint(item: dropdown, attribute: .height, relatedBy: .greaterThanOrEqual, toItem: nil, attribute: .height, multiplier: 1, constant: Defaults.Height)) | |
| window.addConstraint(animatedConstraint) | |
| // Add the padding view constraints | |
| window.addConstraint(NSLayoutConstraint(item: paddingView, attribute: .width, relatedBy: .equal, toItem: dropdown, attribute: .width, multiplier: 1, constant: 0)) | |
| window.addConstraint(NSLayoutConstraint(item: paddingView, attribute: .height, relatedBy: .equal, toItem: dropdown, attribute: .height, multiplier: 1, constant: 0)) | |
| window.addConstraint(NSLayoutConstraint(item: paddingView, attribute: .centerX, relatedBy: .equal, toItem: dropdown, attribute: .centerX, multiplier: 1, constant: 0)) | |
| window.addConstraint(NSLayoutConstraint(item: paddingView, attribute: .bottom, relatedBy: .equal, toItem: dropdown, attribute: .top, multiplier: 1, constant: 0)) | |
| window.layoutIfNeeded() | |
| let animation = self.popAnimationForAnimationType(animationType) | |
| animation.toValue = Defaults.Height | |
| animatedConstraint.pop_add(animation, forKey: "show-dropdown") | |
| dropdown.perform(#selector(dismiss), with: nil, afterDelay: duration + Defaults.AnimationDuration) | |
| } | |
| } | |
| /** | |
| Dismiss the dropdown. | |
| - parameter dropdown: Dropdown object to dismiss. | |
| */ | |
| fileprivate class func dismissAlert(_ dropdown: DropdownAlert) { | |
| guard let window = dropdown.superview as? UIWindow else { | |
| return | |
| } | |
| let constraints = window.constraints.filter { ($0.firstItem === dropdown || $0.secondItem === dropdown) && ($0.firstAttribute == .bottom || $0.secondAttribute == .bottom) && $0.isActive } | |
| guard let animatedConstraint = constraints.first else { | |
| return | |
| } | |
| DispatchQueue.main.async { | |
| let dismissAnimation = POPBasicAnimation(propertyNamed: kPOPLayoutConstraintConstant) | |
| dismissAnimation?.toValue = -Defaults.Height | |
| dismissAnimation?.duration = Defaults.AnimationDuration | |
| animatedConstraint.pop_add(dismissAnimation, forKey: "dropdown-dismiss") | |
| } | |
| } | |
| /** | |
| Dismiss the dropdown. | |
| */ | |
| @objc public func dismiss() { | |
| type(of: self).dismissAlert(self) | |
| } | |
| } | |
| // MARK: - Helpers | |
| private extension DropdownAlert { | |
| /** | |
| Construct a full `POPAnimation` object for the corresponding animation types. | |
| - parameter animationType: `AnimationType` object that describes the desired animation. | |
| - returns: `POPPropertyAnimation` object. | |
| */ | |
| class func popAnimationForAnimationType(_ animationType: AnimationType) -> POPPropertyAnimation { | |
| switch animationType { | |
| case let .basic(timingFunction): | |
| let animation = POPBasicAnimation(propertyNamed: kPOPLayoutConstraintConstant) | |
| animation?.duration = Defaults.AnimationDuration | |
| animation?.timingFunction = timingFunction | |
| return animation! | |
| case let .spring(bounce, speed): | |
| let animation = POPSpringAnimation(propertyNamed: kPOPLayoutConstraintConstant) | |
| animation?.springBounciness = bounce | |
| animation?.springSpeed = speed | |
| return animation! | |
| case let .custom(a): | |
| return a | |
| } | |
| } | |
| } | |
| // MARK: Default Modifiers | |
| public extension DropdownAlert { | |
| public class var defaultBackgroundColor: UIColor { | |
| get { return Defaults.BackgroundColor } | |
| set { Defaults.BackgroundColor = newValue } | |
| } | |
| public class var defaultTextColor: UIColor { | |
| get { return Defaults.TextColor } | |
| set { Defaults.TextColor = newValue } | |
| } | |
| public class var defaultTitle: String { | |
| get { return Defaults.Title } | |
| set { Defaults.Title = newValue } | |
| } | |
| public class var defaultMessage: String { | |
| get { return Defaults.Message } | |
| set { Defaults.Message = newValue } | |
| } | |
| public class var defaultAnimationDuration: Double { | |
| get { return Defaults.AnimationDuration } | |
| set { Defaults.AnimationDuration = newValue } | |
| } | |
| public class var defaultDuration: Double { | |
| get { return Defaults.Duration } | |
| set { Defaults.Duration = newValue } | |
| } | |
| public class var defaultHeight: CGFloat { | |
| get { return Defaults.Height } | |
| set { Defaults.Height = newValue } | |
| } | |
| public class var defaultTitleFont: UIFont { | |
| get { return Defaults.TitleFont } | |
| set { Defaults.TitleFont = newValue } | |
| } | |
| public class var defaultMessageFont: UIFont { | |
| get { return Defaults.MessageFont } | |
| set { Defaults.MessageFont = newValue } | |
| } | |
| public class var defaultFontSize: CGFloat { | |
| get { return Defaults.FontSize } | |
| set { Defaults.FontSize = newValue } | |
| } | |
| } | |
| // MARK: - Setup | |
| private extension DropdownAlert { | |
| /** | |
| Common initialization function. | |
| */ | |
| func commonInit() { | |
| self.titleLabel.font = Defaults.TitleFont | |
| self.messageLabel.font = Defaults.MessageFont | |
| self.titleLabel.numberOfLines = 0 | |
| self.titleLabel.sizeToFit() | |
| self.messageLabel.numberOfLines = 0 | |
| self.addSubview(self.titleLabel) | |
| self.addSubview(self.messageLabel) | |
| self.setupConstraints() | |
| } | |
| /** | |
| Setup the constraints for the dropdown's labels. | |
| */ | |
| func setupConstraints() { | |
| self.addConstraint(NSLayoutConstraint(item: self.titleLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.titleLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.titleLabel, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.messageLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.messageLabel, attribute: .top, relatedBy: .equal, toItem: self.titleLabel, attribute: .bottom, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.messageLabel, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1, constant: 0)) | |
| self.addConstraint(NSLayoutConstraint(item: self.messageLabel, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 1, constant: 0)) | |
| self.layoutIfNeeded() | |
| } | |
| } |
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Fix by taking
Defaultsstruct out ofDropdownAlert