Alerts & Pickers

Advanced usage of native UIAlertController with TextField, DatePicker, PickerView, TableView and CollectionView.

Features

• Custom pickers based on UITextField, UIDatePicker, UIPickerView, UITableView and UICollectionView.
• Example using a Storyboard.
• Easy contentViewController placement.
• Attributed title label and message label.
• Button customization: image and title color.
• Understandable action button placement.
• Easy presentation.
• Pure Swift 4.

Usage

• New Alert

let alert = UIAlertController(style: .alert, title: "Title", message: "Message")
// or
let alert = UIAlertController(style: .alert)

• Set and styling title

alert.set(title: "Title", font: .systemFont(ofSize: 20), color: .black)
// or
alert.setTitle(font: .systemFont(ofSize: 20), color: .black)

• Set and styling message

alert.set(message: "Message", font: .systemFont(ofSize: 16), color: .black)
// or
alert.setMessage(font: .systemFont(ofSize: 16), color: .black)

• Add button with image

alert.addAction(image: image, title: "Title", color: .black, style: .default) { action in
    // completion handler
}

• Show Alert

// show alert
alert.show()

// or show alert with options
alert.show(animated: true, vibrate: true) {
    // completion handler
}

Set Content ViewController

When setting your own custom UIViewController into UIAlertController keep in mind to set prefferedContentSize.height of the controller otherwise it will no effect. You can not set prefferedContentSize.width.

let alert = UIAlertController(style: .alert, title: "Title")
let vc = CustomViewController()
vc.preferredContentSize.height = height
alert.setValue(vc, forKey: "contentViewController")
alert.show()

// or
let alert = UIAlertController(style: .alert, title: "Title")
let vc = CustomViewController()
alert.set(vc: vc, height: height)
alert.show()

Pickers

For UX better to use .actionSheet style in UIAlertController when set picker into contentViewController. If you like you can use .alert style as well, buy .actionSheet style is wider and User can see more as well as action button is placing at bottom that also more convenience for User to touch it.

UITextField In native UIAlertController you can only add UITextField to .alert style with default style and you can not change such properties as .borderColor, .borderWidth, .frame.size and so on. But if you make your own UIViewController with UITextField, it will solve all these problems.

One TextField Picker

You can use both styles .alert and .actionSheet of UIAlertController.

let alert = UIAlertController(style: self.alertStyle, title: "TextField")                  
let config: TextField.Config = { textField in
    textField.becomeFirstResponder()
    textField.textColor = .black
    textField.placeholder = "Type something"
    textField.left(image: image, color: .black)
    textField.leftViewPadding = 12
    textField.borderWidth = 1
    textField.cornerRadius = 8
    textField.borderColor = UIColor.lightGray.withAlphaComponent(0.5)
    textField.backgroundColor = nil
    textField.keyboardAppearance = .default
    textField.keyboardType = .default
    textField.isSecureTextEntry = true
    textField.returnKeyType = .done
    textField.action { textField in
        // validation and so on
    }
}              
alert.addOneTextField(configuration: config)
alert.addAction(title: "OK", style: .cancel)
alert.show()

Two TextFields Picker

You can use both styles .alert and .actionSheet of UIAlertController.

let alert = UIAlertController(style: .alert, title: "Login")

let configOne: TextField.Config = { textField in
    textField.left(image: user), color: .black)
    textField.leftViewPadding = 16
    textField.leftTextPadding = 12
    textField.becomeFirstResponder()
    textField.backgroundColor = nil
    textField.textColor = .black
    textField.placeholder = "Name"
    textField.clearButtonMode = .whileEditing
    textField.keyboardAppearance = .default
    textField.keyboardType = .default
    textField.returnKeyType = .done
    textField.action { textField in
        // action with input
    }
}

let configTwo: TextField.Config = { textField in
    textField.textColor = .black
    textField.placeholder = "Password"
    textField.left(image: lock, color: .black)
    textField.leftViewPadding = 16
    textField.leftTextPadding = 12
    textField.borderWidth = 1
    textField.borderColor = UIColor.lightGray.withAlphaComponent(0.5)
    textField.backgroundColor = nil
    textField.clearsOnBeginEditing = true
    textField.keyboardAppearance = .default
    textField.keyboardType = .default
    textField.isSecureTextEntry = true
    textField.returnKeyType = .done
    textField.action { textField in
        // action with input
    }
}
// vInset - is top and bottom margin of two textFields   
alert.addTwoTextFields(vInset: 12, textFieldOne: configOne, textFieldTwo: configTwo)
alert.addAction(title: "OK", style: .cancel)
alert.show()

DatePicker

UIDatePicker does not look very much in .alert style.

let alert = UIAlertController(style: .actionSheet, title: "Select date")
alert.addDatePicker(mode: .dateAndTime, date: date, minimumDate: minDate, maximumDate: maxDate) { date in
    // action with selected date
}
alert.addAction(title: "OK", style: .cancel)
alert.show()

PickerView

Example how to use UIPickerView as contentViewController and change height of the UIAlertController.

let alert = UIAlertController(style: .actionSheet, title: "Picker View", message: "Preferred Content Height")

let frameSizes: [CGFloat] = (150...400).map { CGFloat($0) }
let pickerViewValues: [[String]] = [frameSizes.map { Int($0).description }]
let pickerViewSelectedValue: PickerViewViewController.Index = (column: 0, row: frameSizes.index(of: 216) ?? 0)

alert.addPickerView(values: pickerViewValues, initialSelection: pickerViewSelectedValue) { vc, picker, index, values in
    DispatchQueue.main.async {
        UIView.animate(withDuration: 1) {
            vc.preferredContentSize.height = frameSizes[index.row]
        }
    }
}
alert.addAction(title: "Done", style: .cancel)
alert.show()

Locale Pickers

Is based on UITableView with UIActivityIndicatorView.

• Country Picker

let alert = UIAlertController(style: .actionSheet, message: "Select Country")
alert.addLocalePicker(type: .country) { info in
    // action with selected object
}
alert.addAction(title: "OK", style: .cancel)
alert.show()

• Phone Code Picker

let alert = UIAlertController(style: .actionSheet, title: "Phone Codes")
alert.addLocalePicker(type: .phoneCode) { info in
    // action with selected object
}
alert.addAction(title: "OK", style: .cancel)
alert.show()

• Currency Picker

let alert = UIAlertController(style: .actionSheet, title: "Currencies")
alert.addLocalePicker(type: .currency) { info in
    alert.title = info?.currencyCode
    alert.message = "is selected"
    // action with selected object
}
alert.addAction(title: "OK", style: .cancel)
alert.show()

Image Pickers

Is based on UICollectionView with UIActivityIndicatorView.

• Horizontal Image Picker

let alert = UIAlertController(style: .actionSheet)
let photos: [UIImage] = images
alert.addImagePicker(
    flow: .horizontal,
    paging: true,
    images: photos,
    selection: .single(action: { [unowned self] image in
        // action with selected image
    }))
alert.addAction(title: "OK", style: .cancel)
alert.show()

• Vertical Image Picker

let alert = UIAlertController(style: .actionSheet)
let photos: [UIImage] = images
alert.addImagePicker(
    flow: .vertical,
    paging: false,
    height: UIScreen.main.bounds.height,
    images: photos,
    selection: .multiple(action: { [unowned self] images in
        // action with selected images
    }))
alert.addAction(title: "OK", style: .cancel)
alert.show()

ColorPicker

Example how to use UIViewController instantiated from Storyboard with Autolayout as contentViewController in the UIAlertController.

var color: UIColor = UIColor(hex: 0xFF2DC6)

let alert = UIAlertController(style: .actionSheet)
alert.set(title: color.hexString, font: .systemFont(ofSize: 17), color: color)
alert.addColorPicker(color: color) { [unowned self] new in
    color = new
    alert.set(title: color.hexString, font: .systemFont(ofSize: 17), color: color)
}
alert.addAction(title: "Done", style: .cancel)
alert.show()

Alerts vs. Action Sheets

There are some things to keep in mind when using .actionSheet and .alert styles:

• Pickers better to use in .actionSheet style.
• UITextField can be used in both styles.

Installing

Manually

Download and drop /Extensions, /Pickers and /Views folders in your project.

Requirements

• Swift 4
• iOS 11 or higher

Authors

• Roman Volodko - dillidon

Communication

• If you found a bug, open an issue.
• If you have a feature request, open an issue.
• If you want to contribute, submit a pull request.

License

This project is licensed under the MIT License.