This elegant Swift dropdown menu appears underneath the navigation bar to display a list of related items when a user clicks on the navigation title.
BTNavigationDropdownMenu is available through CocoaPods. To install it, simply add the following line to your Podfile:
use_frameworks!
pod 'NavBarDropdownMenu'
Go ahead and import NavBarDropdownMenu into your own Swift files
import NavBarDropdownMenu
Note: This library supports for Xcode 9.0 Swift 4.0 and embedded frameworks.
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.
First, assign the items and frame for the dropdown menu. Then, customize the look and feel of the menu by overriding these properties:
cellHeight
- Cell height Default is 50
cellBackgroundColor
- Cell background color Default is whiteColor()
cellSeparatorColor
- Cell separator color Default is darkGrayColor()
cellTextLabelColor
- Text color inside of the cell Default is darkGrayColor()
cellTextLabelFont
- Font inside the cell Default is HelveticaNeue-Bold, size 17
navigationBarTitleFont
- Navigation bar title font Default is HelveticaNeue-Bold, size 17
cellTextLabelAlignment
- Text alignment inside of the cell Default is .Left
cellSelectionColor
- Selected color of the cell Default is lightGrayColor()
checkMarkImage
- Checkmark icon for the cell.
animationDuration
- Animation duration for showing/hiding of the menu Default is 0.5s
arrowImage
- Arrow next to the navigation title
arrowPadding
- Padding between the navigation title and arrow. Default is 15
maskBackgroundColor
- Mask layer color Default is blackColor()
maskBackgroundOpacity
- Opacity of the mask layer Default is 0.3
menuTitleColor
- Title color displayed in the menu. Default is lightGrayColor()
shouldKeepSelectedCellColor
- Selected cell color visibility when menu is shown Default is false
shouldChangeTitleText
- Ability to change the selected title text Default is true
selectedCellTextLabelColor
- Selected cell text label color Default is darkGrayColor()
arrowTintColor
- Tint color of the arrow. Default is whiteColor()
- iOS 8.0+ (CocoaPods with Swift support will only work on iOS 8.0+. Alternatively, you will have to import library manually to your project)
- Xcode 9.0+, Swift 4.0+
See the CHANGELOG for details
BTNavigationDropdownMenu is available under the MIT License. See the LICENSE for details.