03 Mar 2017

PopupDialog – A simple, customizable popup dialog for iOS written in Swift. Replaces UIAlertController alert style

 

Version License Platform Carthage compatible codebeat badge Build Status Master Build Status Development

 

Introduction

Popup Dialog is a simple, customizable popup dialog written in Swift.

   

Features

  •  Easy to use API with hardly any boilerplate code
  •  Convenient default view with image, title, message
  •  Supports custom view controllers
  •  Slick transition animations
  •  Fully themeable via appearance, including fonts, colors, corner radius, shadow, overlay color and blur, etc.
  •  Can be dismissed via swipe and background tap
  •  Objective-C compatible
  •  Works on all screens and devices supporting iOS 8.0+

 

Installation

Cocoapods

PopupDialog is available through CocoaPods. For best results with Swift 3, I recommend installing CocoaPods version 1.1.0 (which might be a prerelease as of this release). Simply add the following to your Podfile:

use_frameworks!

target '<Your Target Name>'
pod 'PopupDialog', '~> 0.5'

Please note that this version is compatiable with iOS8

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. A minimum version of 0.17 is required.

To install, simply add the following lines to your Cartfile:

github "Orderella/PopupDialog" ~> 0.5

Manually

If you prefer not to use either of the above mentioned dependency managers, you can integrate PopupDialog into your project manually by adding the files contained in the Classes folder to your project.

 

Example

You can find this and more example projects in the repo. To run it, clone the repo, and run pod install from the Example directory first.

import PopupDialog

// Prepare the popup assets
let title = "THIS IS THE DIALOG TITLE"
let message = "This is the message section of the popup dialog default view"
let image = UIImage(named: "pexels-photo-103290")

// Create the dialog
let popup = PopupDialog(title: title, message: message, image: image)

// Create buttons
let buttonOne = CancelButton(title: "CANCEL") {
    print("You canceled the car dialog.")
}

let buttonTwo = DefaultButton(title: "ADMIRE CAR") {
    print("What a beauty!")
}

let buttonThree = DefaultButton(title: "BUY CAR", height: 60) {
    print("Ah, maybe next time :)")
}

// Add buttons to dialog
// Alternatively, you can use popup.addButton(buttonOne)
// to add a single button
popup.addButtons([buttonOne, buttonTwo, buttonThree])

// Present dialog
self.present(popup, animated: true, completion: nil)

 

Usage

PopupDialog is a subclass of UIViewController and as such can be added to your view controller modally. You can initialize it either with the handy default view or a custom view controller.

Default Dialog

public convenience init(
    title: String?,
    message: String?,
    image: UIImage? = nil,
    buttonAlignment: UILayoutConstraintAxis = .vertical,
    transitionStyle: PopupDialogTransitionStyle = .bounceUp,
    gestureDismissal: Bool = true,
    completion: (() -> Void)? = nil)

The default dialog initializer is a convenient way of creating a popup with image, title and message (see image one and two).

Bascially, all parameters are optional, although this makes no sense at all. You want to at least add a message and a single button, otherwise the dialog can’t be dismissed, unless you do it manually.

If you provide an image it will be pinned to the top/left/right of the dialog. The ratio of the image will be used to set the height of the image view, so no distortion will occur.

Custom View Controller

public init(
    viewController: UIViewController,
    buttonAlignment: UILayoutConstraintAxis = .vertical,
    transitionStyle: PopupDialogTransitionStyle = .bounceUp,
    gestureDismissal: Bool = true,
    completion: (() -> Void)? = nil)

You can pass your own view controller to PopupDialog (see image three). It is accessible via the viewControllerproperty of PopupDialog, which has to be casted to your view controllers class to access its properties. Make sure the custom view defines all constraints needed, so you don’t run into any autolayout issues.

Buttons are added below the controllers view, however, these buttons are optional. If you decide to not add any buttons, you have to take care of dismissing the dialog manually. Being a subclass of view controller, this can be easily done via dismissViewControllerAnimated(flag: Bool, completion: (() -> Void)?).

Transition Animations

You can set a transition animation style with .BounceUp being the default. The following transition styles are available

public enum PopupDialogTransitionStyle: Int {
    case bounceUp
    case bounceDown
    case zoomIn
    case fadeIn
}

Button Alignment

Buttons can be distributed either .Horizontal or .Vertical, with the latter being the default. Please note distributing buttons horizontally might not be a good idea if you have more than two buttons.

public enum UILayoutConstraintAxis : Int {   
    case horizontal
    case vertical
}

Gesture Dismissal

Gesture dismissal allows your dialog being dismissed either by a background tap or by swiping the dialog down. By default, this is set to true. You can prevent this behavior by setting gestureDismissal to false in the initializer.

Completion

This completion handler is called when the dialog was dismissed. This is especially useful for catching a gesture dismissal.

 

Default Dialog Properties

If you are using the default dialog, you can change selected properties at runtime:

// Create the dialog
let popup = PopupDialog(title: title, message: message, image: image)

// Present dialog
self.present(popup, animated: true, completion: nil)

// Get the default view controller and cast it
// Unfortunately, casting is necessary to support Objective-C
let vc = popup.viewController as! PopupDialogDefaultViewController

// Set dialog properties
vc.image = UIImage(...)
vc.titleText = "..."
vc.messageText = "..."
vc.buttonAlignment = .horizontal
vc.transitionStyle = .bounceUp

 

Styling PopupDialog

Appearance is the preferred way of customizing the style of PopupDialog. The idea of PopupDialog is to define a theme in a single place, without having to provide style settings with every single instantiation. This way, creating a PopupDialog requires only minimal code to be written and no “wrappers”.

This makes even more sense, as popup dialogs and alerts are supposed to look consistent throughout the app, that is, maintain a single style.

Dialog Default View Appearance Settings

If you are using the default popup view, the following appearance settings are available:

var dialogAppearance = PopupDialogDefaultView.appearance()

dialogAppearance.backgroundColor      = UIColor.white
dialogAppearance.titleFont            = UIFont.boldSystemFont(ofSize: 14)
dialogAppearance.titleColor           = UIColor(white: 0.4, alpha: 1)
dialogAppearance.titleTextAlignment   = .center
dialogAppearance.messageFont          = UIFont.systemFont(ofSize: 14)
dialogAppearance.messageColor         = UIColor(white: 0.6, alpha: 1)
dialogAppearance.messageTextAlignment = .center
dialogAppearance.cornerRadius         = 4
dialogAppearance.shadowEnabled        = true
dialogAppearance.shadowColor          = UIColor.black

Overlay View Appearance Settings

This refers to the view that is used as an overlay above the underlying view controller but below the popup dialog view. If that makes sense 😉

let overlayAppearance = PopupDialogOverlayView.appearance()

overlayAppearance.color       = UIColor.black
overlayAppearance.blurRadius  = 20
overlayAppearance.blurEnabled = true
overlayAppearance.liveBlur    = false
overlayAppearance.opacity     = 0.7

Note

Turning on liveBlur, that is realtime updates of the background view, results in a significantly higher CPU usage /power consumption and is therefore turned off by default now. Choose wisely whether you need this feature or not 😉

Button Appearance Settings

The standard button classes available are DefaultButtonCancelButton and DestructiveButton. All buttons feature the same appearance settings and can be styled seperately.

var buttonAppearance = DefaultButton.appearance()

// Default button
buttonAppearance.titleFont      = UIFont.systemFont(ofSize: 14)
buttonAppearance.titleColor     = UIColor(red: 0.25, green: 0.53, blue: 0.91, alpha: 1)
buttonAppearance.buttonColor    = UIColor.clear
buttonAppearance.separatorColor = UIColor(white: 0.9, alpha: 1)

// Below, only the differences are highlighted

// Cancel button
CancelButton.appearance().titleColor = UIColor.lightGray

// Destructive button
DestructiveButton.appearance().titleColor = UIColor.red

Moreover, you can create a custom button by subclassing PopupDialogButton. The following example creates a solid blue button, featuring a bold white title font. Separators are invisble.

public final class SolidBlueButton: PopupDialogButton {

    override public func setupView() {
        defaultFont           = UIFont.boldSystemFont(ofSize: 16)
        defaultTitleColor     = UIColor.white
        defaultButtonColor    = UIColor.blue
        defaultSeparatorColor = UIColor.clear
        super.setupView()
    }
}

These buttons can be customized with the appearance settings given above as well.

 

Dark mode example

The following is an example of a Dark Mode theme. You can find this in the Example project AppDelegate, just uncomment it to apply the custom appearance.

// Customize dialog appearance
let pv = PopupDialogDefaultView.appearance()
pv.titleFont    = UIFont(name: "HelveticaNeue-Light", size: 16)!
pv.titleColor   = UIColor.white
pv.messageFont  = UIFont(name: "HelveticaNeue", size: 14)!
pv.messageColor = UIColor(white: 0.8, alpha: 1)

// Customize the container view appearance
let pcv = PopupDialogContainerView.appearance()
pcv.backgroundColor = UIColor(red:0.23, green:0.23, blue:0.27, alpha:1.00)
pcv.cornerRadius    = 2
pcv.shadowEnabled   = true
pcv.shadowColor     = UIColor.black

// Customize overlay appearance
let ov = PopupDialogOverlayView.appearance()
ov.blurEnabled = true
ov.blurRadius  = 30
ov.liveBlur    = true
ov.opacity     = 0.7
ov.color       = UIColor.black

// Customize default button appearance
let db = DefaultButton.appearance()
db.titleFont      = UIFont(name: "HelveticaNeue-Medium", size: 14)!
db.titleColor     = UIColor.white
db.buttonColor    = UIColor(red:0.25, green:0.25, blue:0.29, alpha:1.00)
db.separatorColor = UIColor(red:0.20, green:0.20, blue:0.25, alpha:1.00)

// Customize cancel button appearance
let cb = CancelButton.appearance()
cb.titleFont      = UIFont(name: "HelveticaNeue-Medium", size: 14)!
cb.titleColor     = UIColor(white: 0.6, alpha: 1)
cb.buttonColor    = UIColor(red:0.25, green:0.25, blue:0.29, alpha:1.00)
cb.separatorColor = UIColor(red:0.20, green:0.20, blue:0.25, alpha:1.00)

 

I can see that there is room for more customization options. I might add more of them over time.

 

Screen sizes and rotation

Rotation and all screen sizes are supported. However, the dialog will never exceed a width of 340 points. This way, the dialog won’t be too big on devices like iPads. However, landscape mode will not work well if the height of the dialog exceeds the width of the screen.

 

Working with text fields

If you are using text fields in your custom view controller, popup dialog makes sure that the dialog is positioned above the keybord whenever it appears. You can opt out of this behaviour by setting keyboardShiftsView to false on a PopupDialog.

Testing

PopupDialog exposes a nice and handy method that lets you trigger a button tap programmatically:

public func tapButtonWithIndex(index: Int)

Other than that, PopupDialog unit tests are included in the root folder.

 

Objective-C

PopupDialog can be used in Objective-C projects as well. Here is a basic example:

#import <PopupDialog/PopupDialog-Swift.h>

PopupDialog *popup = [[PopupDialog alloc] initWithTitle:@"TEST"
                                                message:@"This is a test message!"
                                                  image:nil
                                        buttonAlignment:UILayoutConstraintAxisHorizontal
                                        transitionStyle:PopupDialogTransitionStyleBounceUp
                                       gestureDismissal:YES
                                             completion:nil];

CancelButton *cancel = [[CancelButton alloc] initWithTitle:@"CANCEL" dismissOnTap:YES action:^{
    // Default action
}];

DefaultButton *ok = [[DefaultButton alloc] initWithTitle:@"OK" dismissOnTap:YES action:^{
    // Ok action
}];

[popup addButtons: @[cancel, ok]];

[self presentViewController:popup animated:YES completion:nil];

 

Requirements

Minimum requirement is iOS 8.0. This dialog was written with Swift 3, for 2.2 compatible versions please specify the X release.

 

Changelog

  • 0.5.3 Fixed memory leak with custom view controllers
    Added UI automation & snapshot tests
  • 0.5.2 Fixed image scaling for default view
  • 0.5.1 Introduced custom button height parameter
    Reintroduced iOS8 compatibility
  • 0.5.0 Swift 3 compatibility / removed iOS8
  • 0.4.0 iOS 8 compatibility
  • 0.3.3 Fixes buttons being added multiple times
  • 0.3.2 Dialog repositioning when interacting with keyboard
    Non dismissable buttons option
    Additional completion handler when dialog is dismissed
  • 0.3.1 Fixed Carthage issues
  • 0.3.0 Objective-C compatibility
  • 0.2.2 Turned off liveBlur by default to increase performance
  • 0.2.1 Dismiss via background tap or swipe down transition
  • 0.2.0 You can now pass custom view controllers to the dialog. This introduces breaking changes.
  • 0.1.6 Defer button action until animation completes
  • 0.1.5 Exposed dialog properties
    (titleText, messageText, image, buttonAlignment, transitionStyle)
  • 0.1.4 Pick transition animation style
  • 0.1.3 Big screen support
    Exposed basic shadow appearance
  • 0.1.2 Exposed blur and overlay appearance
  • 0.1.1 Added themeing example
  • 0.1.0 Intitial version

 

Author

Martin Wildfeuer, mwfire@mwfire.de for Orderella Ltd., orderella.co.uk
You might also want to follow us on Twitter, @theMWFire | @Orderella

Thank you

Thanks to everyone who uses, enhances and improves this library, especially the contributors.

 

Images in the sample project

The sample project features two images from Markus Spiske raumrot.com:
Vintage Car One | Vintage Car Two
Thanks a lot for providing these 🙂

 

License

PopupDialog is available under the MIT license. See the LICENSE file for more info.

 

Source: https://github.com/Orderella/PopupDialog

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