Swift Language
文字列から頭文字のUIImageを生成する

前書き

InitialsImageFactory

class InitialsImageFactory: NSObject {

class func imageWith(name: String?) -> UIImage? {

let frame = CGRect(x: 0, y: 0, width: 50, height: 50)
let nameLabel = UILabel(frame: frame)
nameLabel.textAlignment = .center
nameLabel.backgroundColor = .lightGray
nameLabel.textColor = .white
nameLabel.font = UIFont.boldSystemFont(ofSize: 20)
var initials = ""

if let initialsArray = name?.components(separatedBy: " ") {
  
  if let firstWord = initialsArray.first {
    if let firstLetter = firstWord.characters.first {
      initials += String(firstLetter).capitalized
    }
    
  }
  if initialsArray.count > 1, let lastWord = initialsArray.last {
    if let lastLetter = lastWord.characters.first {
      initials += String(lastLetter).capitalized
    }
    
  }
} else {
  return nil
}

nameLabel.text = initials
UIGraphicsBeginImageContext(frame.size)
if let currentContext = UIGraphicsGetCurrentContext() {
  nameLabel.layer.render(in: currentContext)
  let nameImage = UIGraphicsGetImageFromCurrentImageContext()
  return nameImage
}
return nil
}

}