Convert Apple Emoji (String) to UIImage

Updated for Swift 4.1

Add this extension to your project

import UIKitextension String {    func image() -> UIImage? {        let size = CGSize(width: 40, height: 40)        UIGraphicsBeginImageContextWithOptions(size, false, 0)        UIColor.white.set()        let rect = CGRect(origin: .zero, size: size)        UIRectFill(CGRect(origin: .zero, size: size))        (self as AnyObject).draw(in: rect, withAttributes: [.font: UIFont.systemFont(ofSize: 40)])        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()        return image    }}

The code above draws the current String to an Image Context with a white background color and finally transform it into a UIImage.

Now you can write

Example

Given a list of ranges indicating the unicode values of the emoji symbols

let ranges = [0x1F601...0x1F64F, 0x2702...0x27B0]

you can transform it into a list of images

let images = ranges    .flatMap { $0 }    .compactMap { Unicode.Scalar($0) }    .map(Character.init)    .compactMap { String($0).image() }

Result:

I cannot guarantee the list of ranges is complete, you'll need to search for it by yourself 😉

Here's an updated answer with the following changes:

• Centered: Used draw(at:withAttributes:) instead of draw(in:withAttributes:) for centering the text within the resulting UIImage
• Correct Size: Used size(withAttributes:) for having a resulting UIImage of size that correlates to the actual size of the font.
• Comments: Added comments for better understanding

Swift 5

import UIKitextension String {    func textToImage() -> UIImage? {        let nsString = (self as NSString)        let font = UIFont.systemFont(ofSize: 1024) // you can change your font size here        let stringAttributes = [NSAttributedString.Key.font: font]        let imageSize = nsString.size(withAttributes: stringAttributes)        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0) //  begin image context        UIColor.clear.set() // clear background        UIRectFill(CGRect(origin: CGPoint(), size: imageSize)) // set rect size        nsString.draw(at: CGPoint.zero, withAttributes: stringAttributes) // draw text within rect        let image = UIGraphicsGetImageFromCurrentImageContext() // create image from context        UIGraphicsEndImageContext() //  end image context        return image ?? UIImage()    }}

Swift 3.2

import UIKitextension String {    func textToImage() -> UIImage? {        let nsString = (self as NSString)        let font = UIFont.systemFont(ofSize: 1024) // you can change your font size here        let stringAttributes = [NSFontAttributeName: font]        let imageSize = nsString.size(attributes: stringAttributes)        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0) //  begin image context        UIColor.clear.set() // clear background        UIRectFill(CGRect(origin: CGPoint(), size: imageSize)) // set rect size        nsString.draw(at: CGPoint.zero, withAttributes: stringAttributes) // draw text within rect        let image = UIGraphicsGetImageFromCurrentImageContext() // create image from context        UIGraphicsEndImageContext() //  end image context        return image ?? UIImage()    }}

Same thing for Swift 4:

extension String {    func emojiToImage() -> UIImage? {        let size = CGSize(width: 30, height: 35)        UIGraphicsBeginImageContextWithOptions(size, false, 0)        UIColor.white.set()        let rect = CGRect(origin: CGPoint(), size: size)        UIRectFill(rect)        (self as NSString).draw(in: rect, withAttributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 30)])        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()        return image    }}