A Material Design drop down for iOS written in Swift.

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Demo

Do pod try DropDown in your console and run the project to try a demo. To install CocoaPods, run sudo gem install cocoapods in your console.

Installation 📱

CocoaPods

Use CocoaPods.

1. Add pod 'DropDown' to your Podfile.
2. Install the pod(s) by running pod install.
3. Add import DropDown in the .swift files where you want to use it

Carthage

Use Carthage.

1. Create a file name Cartfile.
2. Add the line github "AssistoLab/DropDown".
3. Run carthage update.
4. Drag the built DropDown.framework into your Xcode project.

Source files

1. Download the latest code version or add the repository as a git submodule to your git-tracked project.
2. Drag and drop the src, helpers and also the resources directory from the archive in your project navigator. Make sure to select Copy items when asked if you extracted the code archive outside of your project.

Basic usage ✨

let dropDown = DropDown()

// The view to which the drop down will appear on
dropDown.anchorView = view // UIView or UIBarButtonItem

// The list of items to display. Can be changed dynamically
dropDown.dataSource = ["Car", "Motorcycle", "Truck"]

Optional properties:

// Action triggered on selection
dropDown.selectionAction = { [unowned self] (index: Int, item: String) in
  print("Selected item: \(item) at index: \(index)")
}

// Will set a custom width instead of the anchor view width
dropDownLeft.width = 200

Display actions:

dropDown.show()
dropDown.hide()

Important ⚠️

Don't forget to put:

DropDown.startListeningToKeyboard()

in your AppDelegate's didFinishLaunching method so that the drop down will handle its display with the keyboard displayed even the first time a drop down is showed.

Advanced usage 🛠

Direction

The drop down can be shown below or above the anchor view with:

dropDown.direction = .Any

With .Any the drop down will try to displa itself below the anchor view when possible, otherwise above if there is more place than below. You can restrict the possible directions by using .Top or .Bottom.

Offset

By default, the drop down will be shown onto to anchor view. It will hide it. If you need the drop down to be below your anchor view when the direction of the drop down is .Bottom, you can precise an offset like this:

// Top of drop down will be below the anchorView
dropDown.bottomOffset = CGPoint(x: 0, y:dropDown.anchorView.bounds.height)

If you set the drop down direction to .Any or .Top you can also precise the offset when the drop down will shown above like this:

// When drop down is displayed with `Direction.Top`, it will be above the anchorView
dropDown.topOffset = CGPoint(x: 0, y:-dropDown.anchorView.bounds.height)

Note the minus sign used here to offset to the top.

Cell configuration

Formatted text

By default, the cells in the drop down have the dataSource values as text. If you want a custom formatted text for the cells, you can set cellConfiguration like this:

dropDown.cellConfiguration = { [unowned self] (index, item) in
  return "- \(item) (option \(index))"
}

Custom cell

You can also create your own custom cell, from your .xib file. To have something like this for example:

For this you have to:

1. Create your custom xib
2. Create a DropDownCell subclass
3. Link the cell in your xib to your custom class
4. At least have a label in your nib to link to the optionLabel IBOutlet in code
5. You're all set!
6. From a DropDown instance, do:

dropDown.cellNib = UINib(nibName: "YourNib", bundle: nil)

dropDown.customCellConfiguration = { (index: Index, item: String, cell: DropDownCell) -> Void in
   guard let cell = cell as? MyCell else { return }

   // Setup your custom UI components
   cell.flagImage = flagImages[index]
}

7. And you're good to go! 🙆

Events

dropDown.cancelAction = { [unowned self] in
  println("Drop down dismissed")
}

dropDown.willShowAction = { [unowned self] in
  println("Drop down will show")
}

Dismiss modes

dropDown.dismissMode = .OnTap

You have 3 dismiss mode with the DismissMode enum:

• OnTap: A tap oustide the drop down is needed to dismiss it (Default)
• Automatic: No tap is needed to dismiss the drop down. As soon as the user interact with anything else than the drop down, the drop down is dismissed
• Manual: The drop down can only be dismissed manually (in code)

Others

You can manually (pre)select a row with:

dropDown.selectRowAtIndex(3)

The data source is reloaded automatically when changing the dataSource property. If needed, you can reload the data source manually by doing:

dropDown.reloadAllComponents()

You can get info about the selected item at any time with this:

dropDown.selectedItem() // -> String?
dropDown.indexForSelectedRow() // -> Int?

Customize UI 🖌

You can customize these properties of the drop down:

• textFont: the font of the text for each cells of the drop down.
• textColor: the color of the text for each cells of the drop down.
• backgroundColor: the background color of the drop down.
• selectionBackgroundColor: the background color of the selected cell in the drop down.
• cellHeight: the height of the drop down cells.

You can change them through each instance of DropDown or via UIAppearance like this for example:

DropDown.appearance().textColor = UIColor.blackColor()
DropDown.appearance().textFont = UIFont.systemFontOfSize(15)
DropDown.appearance().backgroundColor = UIColor.whiteColor()
DropDown.appearance().selectionBackgroundColor = UIColor.lightGrayColor()
DropDown.appearance().cellHeight = 60

Expert mode 🤓

when calling the show method, it returns a tuple like this:

(canBeDisplayed: Bool, offscreenHeight: CGFloat?)

• canBeDisplayed: Tells if there is enough height to display the drop down. If its value is false, the drop down is not showed.
• offscreenHeight: If the drop down was not able to show all cells from the data source at once, offscreenHeight will contain the height needed to display all cells at once (without having to scroll through them). This can be used in a scroll view or table view to scroll enough before showing the drop down.

Requirements

• Xcode 7+
• iOS 8+
• ARC

License

This project is under MIT license. For more information, see LICENSE file.

Credits

DropDown was inspired by the Material Design version of the Simple Menu.

DropDown was done to integrate in a project I work on:

It will be updated when necessary and fixes will be done as soon as discovered to keep it up to date.

I work at

You can find me on Twitter @kevinh6113.

Enjoy!