Swift 알파값 적용하여 텍스트 출력

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .left

let attributes: [NSAttributedString.Key : Any] = [
    .paragraphStyle: paragraphStyle,
    .font: UIFont.systemFont(ofSize: 8.0),
    .foregroundColor: UIColor.black.withAlphaComponent(0.4)
]
let attributedString = NSAttributedString(string: place.getName(), attributes: attributes)

let stringRect = CGRect(x: x+7, y: y-6, width: 100, height: 20)
attributedString.draw(in: stringRect)

www.hackingwithswift.com/articles/113/nsattributedstring-by-example

NSAttributedString by example

 

stackoverflow.com/questions/47982390/uitextfield-attributedplaceholder-color-and-opacity-in-swift-4

UITextField attributedPlaceholder color and opacity in swift 4

stackoverflow.com/questions/42498721/drawing-text-over-core-graphics-in-swift-3

Drawing text over Core Graphics in Swift 3