NumericPicker

Description

NumericPicker is a drop-in iOS picker control written in Swift. It simplifies the creation of pickers that allow your users to specify numbers by digit. It automatically uses the proper grouping and decimal separator for the current (or specified) locale. You can easily dictate the number of integer and decimal places in the controller.

Note that the "Picker Value" field is there for demonstration purposes only. It is not included in the NumericPicker control.

---

Table of Contents

• Example
• Minimum Requirements
• Installation
• Usage
• Author
• License

---

Minimum Requirements

Version 1.1.x

• Xcode 10
• iOS 10.3
• Swift 4.2

Version 1.0.x

• Xcode 9
• iOS 10.3

Example

This repo contains an example project demonstrating how to use the NumericPicker control from Interface Builder and from code.

To run the example project, clone the repo, open NumericPicker.xcodeproj and run the NumericPicker-Example scheme

Installation

CocoaPods

NumericPicker is available through CocoaPods.

CocoaPods is a dependency manager for Swift and Objective-C that simplifies the use of 3rd-party libraries like NumericPicker in your projects.

First, add the following line to your Podfile:

pod "NumericPicker"

or, for Xcode 9 and Swift 4.0

pod "NumericPicker", '~> 1.0.0'

Second, install NumericPicker into your project:

pod install

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

To integrate NumericPicker into your Xcode project using Carthage, specify it in your Cartfile:

github "MattLewin/NumericPicker"

or, for Xcode 9 and Swift 4.0

github "MattLewin/NumericPicker" ~> 1.0.0

Run carthage update to build the framework and drag the built NumericPicker.framework (in Carthage/Build/iOS folder) into your Xcode project (Linked Frameworks and Libraries in Targets).

Swift Package Manager (SPM)

The Swift Package Manager does not yet support importing UIKit or compilation for iOS. Thus, NumericPicker can not yet be used with the SPM.

Manually

1. Copy NumericPicker.swift into your project
2. Have a nice day

Usage

NumericPicker is a subclass of UIControl. In this way it is more like UIDatePicker than it is like UIPickerView. What this means for you is that you don't need to implement UIPickerViewDataSource or UIPickerViewDelegate.

Note that the provided Example demonstrates everything detailed below.

Configurable Properties

• value: Double - The value displayed in the picker. Set this value to update the picker programatically. (Default: 0)
• minIntegerDigits: Int - The minimum number of integer digits (digits to the left of the decimal separator) to include in the picker. Think of this as zero-padding the picker. If value requires more than this minimum, the picker will automatically meet this requirement. (This is probably not what you want, though.) (Default: 1)
• fractionDigits: Int - The number of digits to the right of the decimal separator. NumericPicker guarantees exactly this many fractional digits will be displayed. You can use this to achieve rounding or zero-padding of values to the right of the decimal separator. (Default: 0)
• locale: Locale - The locale used to format the numeric values. Use this if you want numbers formatted with separators other than those used by the device locale. (Default: current device locale)
• font: UIFont - The font used to format the picker components. (Default: Body text style)
• displayString: String - READ ONLY - The text representation of value. This string will contain locale-specific grouping and decimal separators. It will have exactly fractionDigits digits to the right of the decimal separator and the minimum number of integer places necessary to represent value.

Interface Builder

To use NumericPicker with Interface Builder, add a UIControl to your storyboard or XIB, and then set the "Custom Class" to NumericPicker. Connect the "Value Changed" event to a function in your view controller. (Be certain to set the "Type" to NumericPicker as shown below.)

Within that function, you can access sender.displayString or sender.value as needed.

Cocoapods or Manually

If you are using Cocoapods or have dropped NumericPicker.swift into your code, you can configure value, minIntegerDigits, and fractionDigits from the "Attributes" inspector.

Carthage

Xcode does not currently (as of 9.0) support @IBInspectable properties from external frameworks. The means you cannot configure the above properties in IB. You can, however, trick IB into rendering NumericPicker with its default values by adding the following code to one of your view controllers:

@IBDesignable extension NumericPicker { }

Code

Add a NumericPicker control from code as you would any other subview. Here is the code from NumericPicker-Example/ViewController.swift to produce the bottom sample NumericPicker. Note that it is typically unnecessary to set locale, as NumericPicker will use the current device locale by default.

var codeNumericPicker = NumericPicker()
codeNumericPicker.minIntegerDigits = 6
codeNumericPicker.fractionDigits = 3
codeNumericPicker.value = 76543.21
codeNumericPicker.locale = Locale(identifier: "de-DE")
codeNumericPicker.addTarget(self, action: #selector(codeValueChanged), for: .valueChanged)
codePickerStack.addArrangedSubview(codeNumericPicker)

Author

Matt Lewin, [email protected]

License

NumericPicker is available under the MIT license. See LICENSE.md for more info.