Introduction

The elegant yet functional dropdown menu, written in Swift, appears underneath the navigation bar to display a list of defined items when a user clicks on the navigation title.

Installation

CocoaPods

BTNavigationDropdownMenu is available through CocoaPods. To install it, simply add the following line to your Podfile:

use_frameworks!
pod 'BTNavigationDropdownMenu'

Go ahead and import BTNavigationDropdownMenu into your own Swift files

import BTNavigationDropdownMenu

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 BTNavigationDropdownMenu into your Xcode project using Carthage, specify it in your Cartfile:

github "PhamBaTho/BTNavigationDropdownMenu" ~> 0.7

Run carthage update to build the framework and drag the built BTNavigationDropdownMenu.framework into your Xcode project.

Usage

Instantiate

Start by creating an Array that contains strings as elements of a dropdown list:

let items = ["Most Popular", "Latest", "Trending", "Nearest", "Top Picks"]

Create a new instance of BTNavigationDropdownMenu:

let menuView = BTNavigationDropdownMenu(navigationController: self.navigationController, containerView: self.navigationController!.view, title: BTTitle.title("Dropdown Menu"), items: items)

or like this:

let menuView = BTNavigationDropdownMenu(title: BTTitle.index(1), items: items)

BTTitle is an enum. We can set BTTitle.title(string) or BTTitle.index(Int) (Note: BTTitle.index is the index of defined items array).

By default, navigationController is the topmost navigation controller and containerView is keyWindow.

(keyWindow is recommended for containerView so that the black overlay can cover the whole screen. In some cases, keyWindow doesn't work properly, like using with side menu (e.g. SWRevealViewController), the dropdown menu doesn't move along with the parent view or navigation controller. To workaround this issue, you can use self.navigationController!.view.)

Set title of navigation bar as menuView:

self.navigationItem.titleView = menuView

Call BTNavigationDropdownMenu closure to get the index of selected cell:

menuView.didSelectItemAtIndexHandler = {[weak self] (indexPath: Int) -> () in
            print("Did select item at index: \(indexPath)")
            self.selectedCellLabel.text = items[indexPath]
}

menuView.show() or menuView.hide() to show or hide dropdown menu manually.

menuView.toggle() to toogle dropdown menu shown/hide.

menuView.isShown (Boolean type) property to check showing state of dropdown menu.

menuView.updateItems(items: [AnyObject]) to update items in dropdown menu.

Customization

First, assign the items and frame for the dropdown menu. Then, customize the look and feel of the menu by overriding these properties:

Name	Description	Default value
navigationBarTitleFont	Navigation bar title font	System font, bold, size 17
cellHeight	Cell height	50
arrowImage	Arrow next to the navigation title	Provided image
arrowPadding	Padding between the navigation title and arrow	15
cellBackgroundColor	Cell background color	UIColor.white
cellSeparatorColor	Cell separator color	UIColor.darkGray
cellTextLabelColor	Text color inside of the cell	UIColor.darkGray
cellTextLabelFont	Text font inside the cell	System font, bold, size 17
cellTextLabelAlignment	Text alignment inside of the cell	NSTextAlignment.left
cellSelectionColor	Selected color of the cell	UIColor.lightGray
checkMarkImage	Checkmark icon for the cell	Provided image
animationDuration	Animation duration for showing/hiding of the menu	0.3
maskBackgroundColor	Mask layer color	UIColor.black
maskBackgroundOpacity	Opacity of the mask layer	0.3
menuTitleColor	Title color displayed in the menu	UIColor.lightGray
shouldKeepSelectedCellColor	Selected cell color visibility when menu is shown	false
shouldChangeTitleText	Ability to change the selected title text	true
selectedCellTextLabelColor	Selected cell text label color	UIColor.darkGray
arrowTintColor	Tint color of the arrow	UIColor.white

Requirement

• iOS 9.0+

Changelog

See the CHANGELOG for details

License

BTNavigationDropdownMenu is available under the MIT License. See the LICENSE for details.