[Swift] 画像とテキストを合成

Swiftで画像とテキストを合成するサンプルコード

コード

func drawText(image :UIImage) ->UIImage
{
    let text = "Some text.."

    let font = UIFont.boldSystemFontOfSize(32)
    let imageRect = CGRectMake(0,0,image.size.width,image.size.height)

    UIGraphicsBeginImageContext(image.size);

    image.drawInRect(imageRect)

    let textRect  = CGRectMake(5, 5, image.size.width - 5, image.size.height - 5)
    let textStyle = NSMutableParagraphStyle.defaultParagraphStyle().mutableCopy() as NSMutableParagraphStyle
    let textFontAttributes = [
        NSFontAttributeName: font,
        NSForegroundColorAttributeName: UIColor.whiteColor(),
        NSParagraphStyleAttributeName: textStyle
    ]
    text.drawInRect(textRect, withAttributes: textFontAttributes)

    let newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext()

    return newImage
}

実行結果

参考リンク

• How to write text on image in objective-c iPhone?
• Swift - Drawing text with drawInRect:withAttributes: