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A simple and versatile pop-up presenter written in Swift

A simple and versatile pop-up presenter written in Swift

SwiftEntryKit

SwiftEntryKit is a banner presenter library for iOS. It can be used to easily display pop-ups and notification-like views within your iOS apps.

Features

Banners or Pop-Ups are called Entries.

  • The entries are displayed in a separated UIWindow (of type EKWindow), so the user is able to navigate the app freely while entries are being displayed in a non intrusive manner.
  • The kit offers some beautiful presets that can be themed with your app colors and fonts.
  • Customization: Entries are highly customizable
    • [x] Can be displayed at the top or the bottom of the screen.
    • [x] Can be displayed within or outside the screen's safe area.
    • [x] Can be stylized: have a border, drop-shadow and round corners.
    • [x] Their content's and the screen's background can be blurred, dimmed, colored or have a gradient style.
    • [x] Transition animations are customizable - Entrance, Exit and Pop (by another entry).
    • [x] The user interactions with the entry or the screen can be intercepted.
    • [x] Entries have an optional rubber banding effect in panning.
    • [x] Entries can be optionally dismissed by a simple swipe gesture.
    • [x] Entries have display priority attribute. That means that an entry can be dismissed only be other entry with equal or higher priority.
    • [x] The status bar style is settable for the display duration of the entry.
    • [x] SwiftEntryKit supports custom views as well.

Example Project

The example project contains various presets and examples you can use and modify as your like.
To install the example project, git clone from master and run SwiftEntryKitDemo scheme.

Presets

Toasts Notes Floats Popups Alerts Forms Custom
toasts_example notes_example floats_example popup_example alert_example forms nib_example

Playground

noun: a place where people can play 🏈

The example app contains a playground screen, an interface that allows you to customize your preferable entries.
The playground screen has some limitations (allows to select constant values) but you can easily modify the code to suit your needs. Check it out!

The Playground Screen Top Toast Sample
playground_example playground-sample-1

Requirements

  • iOS 9 or any higher version.
  • Xcode 9 or any higher version.
  • Swift 4.0 or any higher version.
  • The library has not been tested with iOS 8.x.y or a lower version.
  • SwiftEntryKit leans heavily on QuickLayout - A lightwight library written in Swift that is used to easily layout views programmatically.

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

To integrate SwiftEntryKit into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/cocoapods/specs.git'
platform :ios, '9.0'
use_frameworks!

pod 'SwiftEntryKit', '0.2.4'

Then, run the following command:

$ pod install

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

To integrate SwiftEntryKit into your Xcode project using Carthage, specify the following in your Cartfile:

github "huri000/SwiftEntryKit" == 0.2.4

Usage

Quick Usage

No setup is needed! Each time you wish to display an entry, just create your view and initialize an EKAttributes struct.
See also the preset usage example, and the example project.
likewise:

// Customized view
let customView = SomeCustomView()
/*
Do some customization on customView
*/

// Attributes struct that describes the display, style, user interaction and animations of customView.
var attributes = EKAttributes()
/*
Adjust preferable attributes
*/

And then, just call:

SwiftEntryKit.display(entry: customView, using: attributes)

The kit will replace the application main window with the EKWindow instance and display the entry.

Entry Attributes

EKAttributes is the entry's descriptor. Each time an entry is displayed, an EKAttributes struct is necessary to describe the entry's presentation, position inside the screen, the display duration, it's frame constraints (if needed), it's styling (corners, border and shadow), the user interaction events, the animations (in / out) and more.

Create a mutable EKAttributes structure likewise:

var attributes = EKAttributes()

Below are the properties that can be modified in the EKAttributes:

Window Level

Entries can be displayed above the application main window, above the status bar, above the alerts window or even have a custom level (UIWindowLevel).

For example, set the window level to normal, likewise:

attributes.windowLevel = .normal

This causes the entry to appear above the application key window and below the status bar.

Display Position

The entry can be displayed either at the top, center, or the bottom of the screen.

For example, set the display position to top, likewise:

attributes.position = .top

Display Priority

The display priority of the entry determines whether it dismisses other entries or be dismissed by them.
An entry can be dismissed only by an entry with an equal or a higher display priority.

let highPriorityAttributes = EKAttributes()
highPriorityAttributes.displayPriority = .high

let normalPriorityAttributes = EKAttributes()
normalPriorityAttributes.displayPriority = .normal

// Display high priority entry
SwiftEntryKit.display(entry: view1, using: highPriorityAttributes)

// Display normal priority entry (ignored!)
SwiftEntryKit.display(entry: view2, using: normalPriorityAttributes)

view2 won't be displayed!

Display Duration

The display duration of the entry (Counted from the moment the entry has finished it's entrance animation and until the exit animation begins).

Display for 2 seconds:

attributes.displayDuration = 2

Display for an infinate duration

attributes.displayDuration = .infinity

Position Constraints

Constraints that tie the entry tightly to the screen contexts, for example: Height, Width, Max Width, Max Height, Additional Vertical Offset & Safe Area related info.

For example:

Ratio edge - signifies that the ratio of the width edge has a ratio of 0.9 of the screen's width.

let widthConstraint = EKAttributes.PositionConstraints.Edge.ratio(value: 0.9)

Intrinsic edge - signifies that the wanted height value is the content height - Decided by the entries vertical constraints

let heightConstraint = EKAttributes.PositionConstraints.Edge.intrinsic

Create the entry size constraints likewise:

attributes.positionConstraints.size = .init(width: widthConstraint, height: heightConstraint)

You can also set attributes.positionConstraints.maxSize in order to make sure the entry does not exceeds predefined limitations. This is useful on device orientation change.

Safe Area - can be used to override the safe area or to color it (More examples are in the example project)
That snippet implies that the safe area insets should be kept and not be a part of the entry.

attributes.positionConstraints.safeArea = .empty(fillSafeArea: false)

Vertical Offset - An additional offset that can be applied to the entry (Other than the safe area).

attributes.positionConstraints.verticalOffset = 10

Keyboard Releation - used to bind an entry to the keyboard once the keyboard is displayed.

let offset = EKAttributes.PositionConstraints.KeyboardRelation.Offset(bottom: 10, screenEdgeResistance: 20)
let keyboardRelation = EKAttributes.PositionConstraints.KeyboardRelation.bind(offset: offset)
attributes.positionConstraints.keyboardRelation = keyboardRelation

In the example above the entry's bottom is tuned to have a 10pts offset from the top of the keyboard (while it shows)
Because the entry's frame might exceed the screen bounds, the user might not see all the entry - we wouldn't want that. Therefore, an additional associated value has been added - screenEdgeResistance with value of 20pts. That is, to make sure that the entry remains within the bounds of the screen, and always visible to the user.
The extreme situation might occur as the device orientation is landscape and the keyboard shows up (See example project form presets for more information).

User Interaction

The entry and the screen can be interacted by the user. User interaction be can intercepted in various ways:

An interaction (Any touch whatsoever) with the entry delays it's exit by 3s:

attributes.entryInteraction = .delayExit(by: 3)

A tap on the entry / screen dismisses it immediately:

attributes.entryInteraction = .dismiss
attributes.screenInteraction = .dismiss

A tap on the entry is swallowed (ignored):

attributes.entryInteraction = .absorbTouches

A tap on the screen is forwarded to the lower level window, in most cases the receiver will be the application window.
This is very useful when you want to display an unintrusive content like banners and push notification entries.

attributes.screenInteraction = .forward

Pass additional actions that are invokes when the user taps the entry:

let action = {
    // Do something useful
}
attributes.entryInteraction.customTapActions.append(action)

Scroll Behavior

Describes the entry behavior when it's being scrolled, that is, dismissal by a swipe gesture and a rubber band effect much similar to a UIScrollView.

Disable the pan and swipe gestures on the entry:

attributes.scroll = .disabled

Enable swipe and stretch and pullback with jolt effect:

attributes.scroll = .enabled(swipeable: true, pullbackAnimation: .jolt)

Enable swipe and stretch and pullback with an ease-out effect:

attributes.scroll = .enabled(swipeable: true, pullbackAnimation: .easeOut)

Enable swipe but disable stretch:

attributes.scroll = .edgeCrossingDisabled(swipeable: true)

Haptic Feedback

The device can produce a haptic feedback, thus adding an additional sensory depth to each entry.

Background Style

The entry and the screen can have various background styles, such as blur, color, gradient and even an image.

The default value is .clear. This example implies clear background for both the entry and the screen:

attributes.entryBackground = .clear
attributes.screenBackground = .clear

Colored entry background and dimmed screen background:

attributes.entryBackground = .color(color: .white)
attributes.screenBackground = .color(color: UIColor(white: 0.5, alpha: 0.5))

Gradient entry background (diagonal vector):

let colors: [UIColor] = [.red, .green, .blue]
attributes.entryBackground = .gradient(gradient: .init(colors: colors, startPoint: .zero, endPoint: CGPoint(x: 1, y: 1)))

Visual Effect entry background:

attributes.entryBackground = .visualEffect(style: .light)

Shadow

The shadow that surrounds the entry.

Enable shadow around the entry:

attributes.shadow = .active(with: .init(color: .black, opacity: 0.3, radius: 10, offset: .zero))

Disable shadow around the entry:

attributes.shadow = .none

Round Corners

Round corners around the entry.

Only top left and right corners with radius of 10:

attributes.roundCorners = .top(radius: 10)

Only bottom left and right corners with radius of 10:

attributes.roundCorners = .bottom(radius: 10)

All corners with radius of 10:

attributes.roundCorners = .all(radius: 10)

No round corners:

attributes.roundCorners = .none

Border

The border around the entry.

Add a black border with thickness of 0.5pts:

attributes.border = .value(color: .black, width: 0.5)

No border:

attributes.border = .none

Animations

Describes how the entry animates into and out of the screen.

  • Each animation descriptor can have up to 3 types of animations at the same time. Those can be combined to a single complex one!
  • Translation animation anchor can be explicitly set but it receives a default value according to position of the entry.

Example for translation from top with spring, scale in and even fade in as a single entrance animation:

attributes.entranceAnimation = .init(
                 translate: .init(duration: 0.7, anchorPosition: .top, spring: .init(damping: 1, initialVelocity: 0)), 
                 scale: .init(from: 0.6, to: 1, duration: 0.7), 
                 fade: .init(from: 0.8, to: 1, duration: 0.3))

Pop Behavior

Describes the entry behavior when it's being popped (dismissed by an entry with equal / higher display-priority.

The entry is being popped animatedly:

attributes.popBehavior = .animated(animation: .init(translate: .init(duration: 0.2)))

The entry is being overriden (Disappears promptly):

attributes.popBehavior = .overriden

Status Bar

The status bar appearance can be modified during the display of the entry. In order to enable this feature, set View controller-based status bar appearance to NO in your project's info.plist file.

Setting the status bar style is fairly simple:

Status bar becomes visible and gets a light style:

attributes.statusBar = .light

The status bar becomes hidden:

attributes.statusBar = .hidden

The status bar appearance is inferred from the previous context (won't be changed):

attributes.statusBar = .inferred

In case there is an already presenting entry with lower/equal display priority, the status bar will change it's style
When the entry is removed the status bar gets it's initial style back.

EKAttributes' interface is as follows:

public struct EKAttributes

    // Display
    public var windowLevel: WindowLevel
    public var position: Position
    public var displayPriority: DisplayPriority
    public var displayDuration: DisplayDuration
    public var positionConstraints: PositionConstraints

    // User Interaction
    public var screenInteraction: UserInteraction
    public var entryInteraction: UserInteraction
    public var scroll: Scroll
    public var hapticFeedbackType: NotificationHapticFeedback

    // Theme & Style
    public var entryBackground: BackgroundStyle
    public var screenBackground: BackgroundStyle
    public var shadow: Shadow
    public var roundCorners: RoundCorners
    public var border: Border
    public var statusBar: StatusBar
    
    // Animations
    public var entranceAnimation: Animation
    public var exitAnimation: Animation
    public var popBehavior: PopBehavior
}

Presets Usage Example:

You can use one of the presets that come with SwiftEntryKit, doing these 4 simple steps:

  1. Create your EKAttributes struct and set your preferrable properties.
  2. Create EKNotificationMessage struct (The Content) and set the content.
  3. Create EKNotificationMessageView (The View) and inject EKNotificationMessage struct to it.
  4. Display the entry using SwiftEntryKit class method.

EKNotificationMessageView preset example:

// Generate top floating entry and set some properties
var attributes = EKAttributes.topFloat
attributes.entryBackground = .gradient(gradient: .init(colors: [.red, .green], startPoint: .zero, endPoint: CGPoint(x: 1, y: 1)))
attributes.popBehavior = .animated(animation: .init(translate: .init(duration: 0.3), scale: .init(from: 1, to: 0.7, duration: 0.7)))
attributes.shadow = .active(with: .init(color: .black, opacity: 0.5, radius: 10, offset: .zero))
attributes.statusBar = .dark
attributes.scroll = .enabled(swipeable: true, pullbackAnimation: .jolt)
attributes.positionConstraints.maxSize = .init(width: .constant(value: UIScreen.main.minEdge), height: .intrinsic)

let title = EKProperty.LabelContent(text: titleText, style: .init(font: titleFont, color: textColor))
let description = EKProperty.LabelContent(text: descText, style: .init(font: descFont, color: textColor))
let image = EKProperty.ImageContent(image: UIImage(named: imageName)!, size: CGSize(width: 35, height: 35))
let simpleMessage = EKSimpleMessage(image: image, title: title, description: description)
let notificationMessage = EKNotificationMessage(simpleMessage: simpleMessage)

let contentView = EKNotificationMessageView(with: notificationMessage)
SwiftEntryKit.display(entry: contentView, using: attributes)

Custom View Usage Example:

// Create a basic toast that appears at the top
var attributes = EKAttributes.topToast

// Set it's background to white
attributes.entryBackground = .color(color: .white)

// Animate in and out using default translation
attributes.entranceAnimation = .translation
attributes.exitAnimation = .translation

let customView = UIView()
/*
... Customize the view as you like ...
*/

// Display the view with the configuration
SwiftEntryKit.display(entry: customView, using: attributes)

Dismissing an Entry

You can dismiss an entry by simply invoke dismiss in the SwiftEntryKit class, likewise:

SwiftEntryKit.dismiss()

This will dismiss the entry animatedly using it's exitAnimation attribute and on comletion it'll remove the window as well.

Is Currently Displaying

Inquire whether an entry is currently displayed:

if SwiftEntryKit.isCurrentlyDisplaying {
    /* Do your things */
}

Swiping and Rubber Banding

Entries can be panned vertically (This ability can be enabled using the scroll attributes).
Thefore it's only natural that an entry can be dismissed using a swipe-like gesture.

Enable swipe gesture. When the swipe gesture fails (doesn't pass the velocity threshold) ease it back.

attributes.scroll = .enabled(swipeable: true, pullbackAnimation: .easeOut)

Enable swipe gesture. When the swipe gesture fails throw it back out with a jolt.

attributes.scroll = .enabled(swipeable: true, pullbackAnimation: .jolt)

The PullbackAnimation values (duration, damping & initialSpringVelocity) can be customized as well.

Swipe Jolt
swipe_example band_example

Dealing with safe area:

EKAttributes.PositionConstraints.SafeArea may be used to override the safe area with the entry's content, or to fill the safe area with a background color (like Toasts do), or even leave the safe area empty (Like Floats do).

SwiftEntryKit supports iOS 11.x.y and is backward compatible to iOS 9.x.y, so the status bar area is treated as same as the safe area in earlier iOS versions.

Dealing with orientation change:

SwiftEntryKit identifies orientation changes and adjust the entry's layout to those changes.
Therefore, if you wish to limit the entries's width, you are able to do so by giving it a maximum value, likewise:

var attributes = EKAttributes.topFloat

// Give the entry the width of the screen minus 20pts from each side, the height is decided by the content's contraint's
attributes.positionConstraints.size = .init(width: .offset(value: 20), height: .intrinsic)

// Give the entry maximum width of the screen minimum edge - thus the entry won't grow much when the device orientation changes from portrait to landscape mode.
let edgeWidth = min(UIScreen.main.bounds.width, UIScreen.main.bounds.height)
attributes.positionConstraints.maxSize = .init(width: .constant(value: edgeWidth), height: .intrinsic)

let customView = UIView()
/*
... Customize the view as you like ...
*/

// Use class method of SwiftEntryKit to display the view using the desired attributes
SwiftEntryKit.display(entry: customView, using: attributes)
Orientation Change Demonstration

orientation_change

Known Issues

Unable to find specification for SwiftEntryKit (=X.Y.Z) - In case you get this error please review this thread.

Author

Daniel Huri, [email protected]

GitHub