Quick log to NSTextView in Swift

xlog.swift

extension NSTextView {
    func appendText(line: String) {
        Async.main {
            let attrDict = [NSFontAttributeName: NSFont.systemFontOfSize(18.0)]
            let astring = NSAttributedString(string: "\(line)\n", attributes: attrDict)
            self.textStorage?.appendAttributedString(astring)
            let loc = self.string?.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)

            let range = NSRange(location: loc!, length: 0)
            self.scrollRangeToVisible(range)
        }
    }
}

func xlog(logView:NSTextView?, line:String) {
    if let view = logView {
        view.appendText(line)
    }
}