Swiftpack.co - guoyingtao/Mantis as Swift Package

Swiftpack.co is a collection of thousands of indexed Swift packages. Search packages.
See all packages published by guoyingtao.
guoyingtao/Mantis v2.18.0
An iOS Image cropping library, which mimics the Photo App written in Swift.
⭐️ 784
🕓 12 weeks ago
iOS macOS
.package(url: "https://github.com/guoyingtao/Mantis.git", from: "v2.18.0")


swift 5.0 badge platform iOS badge license MIT badge


Mantis is an iOS Image cropping library, which mimics the Photo App written in Swift and provides rich cropping interactions for your iOS/Mac app (Catalyst only).

Mantis RotaionDial Mantis SlideDial


Mantis Normal Demos Mantis RotaionDial Demos Mantis SlideDial Demos

Mantis also provides rich crop shapes from the basic circle/square to polygon to arbitrary paths(We even provide a heart shape ❤️ 😏).



  • iOS 11.0+
  • MacOS 10.15+
  • Xcode 10.0+

Breaking Changes in 2.x.x

  • Add CropViewConfig
    • move some properties from Config to CropViewConfig
    • make roationControlViewConfig as a property of CropViewConfig
  • Refactor CropToolbarConfigProtocol
    • rename some properties


pod 'Mantis', '~> 2.18.0'
github "guoyingtao/Mantis"
Swift Packages


  • Create a cropViewController in Mantis with default config and default mode

You need set (cropViewController or its navigation controller).modalPresentationStyle = .fullscreen for iOS 13+ when the cropViewController is presented

    let cropViewController = Mantis.cropViewController(image: <Your Image>)
    cropViewController.delegate = self
    <Your ViewController>.present(cropViewController, animated: true)
  • The caller needs to conform CropViewControllerDelegate
public protocol CropViewControllerDelegate: class {
    func cropViewControllerDidCrop(_ cropViewController: CropViewController, cropped: UIImage, transformation: Transformation, cropInfo: CropInfo)
    func cropViewControllerDidCancel(_ cropViewController: CropViewController, original: UIImage)
    // The implementation of the following functions are optional
    func cropViewControllerDidFailToCrop(_ cropViewController: CropViewController, original: UIImage)     
    func cropViewControllerDidBeginResize(_ cropViewController: CropViewController)
    func cropViewControllerDidEndResize(_ cropViewController: CropViewController, original: UIImage, cropInfo: CropInfo)    
CropToolbar mode
  • CropToolbar has two modes:

    • normal mode

    In normal mode, you can use a set of standard CropViewController photo editing features with "Cancel" and "Done" buttons.


let cropViewController = Mantis.cropViewController(image: <Your Image>)
  • embedded mode

This mode does not include "Cancel" and "Done" buttons, so you can embed CropViewController into another view controller


var config = Mantis.Config()
config.cropToolbarConfig.mode = .embedded
let cropViewController = Mantis.cropViewController(image: <Your Image>, config: config)
Add your own ratio
            // Add a custom ratio 1:2 for portrait orientation
            let config = Mantis.Config()
            config.addCustomRatio(byVerticalWidth: 1, andVerticalHeight: 2)            
            <Your Crop ViewController> = Mantis.cropViewController(image: <Your Image>, config: config)
            // Set the ratioOptions of the config if you don't want to keep all default ratios
            let config = Mantis.Config() 
            //config.ratioOptions = [.original, .square, .custom]
            config.ratioOptions = [.custom]
            config.addCustomRatio(byVerticalWidth: 1, andVerticalHeight: 2)            
            <Your Crop ViewController> = Mantis.cropViewController(image: <Your Image>, config: config)
  • If you always want to use only one fixed ratio, set Mantis.Config.presetFixedRatioType = alwaysUsingOnePresetFixedRatio
    <Your Crop ViewController>.config.presetFixedRatioType = .alwaysUsingOnePresetFixedRatio(ratio: 16.0 / 9.0)

When choose alwaysUsingOnePresetFixedRatio, fixed-ratio setting button does not show.

  • If you want to hide rotation control view, set Mantis.Config.cropViewConfig.showAttachedRotationControlView = false
  • If you want to use ratio list instead of presenter, set Mantis.CropToolbarConfig.ratioCandidatesShowType = .alwaysShowRatioList
public enum RatioCandidatesShowType {
    case presentRatioList
    case alwaysShowRatioList
  • If you build your custom toolbar you can add your own fixed ratio buttons
// set a custom fixed ratio
cropToolbarDelegate?.didSelectRatio(ratio: 9 / 16)
Crop shapes
  • If you want to set different crop shape, set Mantis.Config.cropViewConfig.cropShapeType
public enum CropShapeType {
    case rect
    case square
    case ellipse
    case circle(maskOnly: Bool = false)
    case diamond(maskOnly: Bool = false)
    case heart(maskOnly: Bool = false)
    case polygon(sides: Int, offset: CGFloat = 0, maskOnly: Bool = false)
    case path(points: [CGPoint], maskOnly: Bool = false)
Preset transformations
  • If you want to apply transformations when showing an image, set Mantis.Config.cropViewConfig.presetTransformationType
public enum PresetTransformationType {
    case none
    case presetInfo(info: Transformation)
    case presetNormalizedInfo(normalizedInfo: CGRect)

Please use the transformation information obtained previously from delegate method cropViewControllerDidCrop(_ cropViewController: CropViewController, cropped: UIImage, transformation: Transformation, , cropInfo: CropInfo).

  • UIKit project
    Add more languages support to the Localizations section for Project Info tab

fig 1

  • SwiftUI project
    Please check this link

  • Static frameworks If you use static frameworks in CocoaPods, you need to add the code below in order to find the correct resource bundle.

    Mantis.locateResourceBundle(by: Self.self)
  • Custom localization tables and bundle

By default mantis will use built in localization tables to get string resources not every language is supported out of the box (see fig 1).

However if your app support multiple languages and those languages are not 'built in', then you can define your own strings table and localize them in the application target or framework. By doing so you'll need to configure Mantis localization.

IMPORTANT! Firstly you'll need to create strings file with these keys:

"Mantis.Done" = "";
"Mantis.Cancel" = "";
"Mantis.Reset" = "";
"Mantis.Original" = "";
"Mantis.Square" = "";

Then you'll need to configure Mantis:

let config = Mantis.Config()
config.localizationConfig.bundle = // a bundle where strings file is located
config.localizationConfig.tableName = // a localized strings file name within the bundle
Custom View Controller
  • If needed you can subclass CropViewController:
class CustomViewController: CropViewController {
    override func viewDidLoad() {

        // Do your custom logic here.
        // The MantisExample project also has a showcase for a CustomViewController.
  • To get an instance, Mantis provides a factory method:
let cropViewController: CustomViewController = Mantis.cropViewController(image: image, config: config)

Demo projects

Mantis provide two demo projects

  • MantisExample (using Storyboard)
  • MantisSwiftUIExample (using SwiftUI)



Stars: 784
Last commit: 2 weeks ago
Advertisement: IndiePitcher.com - Cold Email Software for Startups

Related Packages

Release Notes

release-please-action v2.18.0
12 weeks ago


  • Output realtime transformation for a special use case (#363) (a5f9728)

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API | Analytics