问目标C/ Swift如何打开base64 url？

EN

import UIKit

class ViewController: UIViewController {

@IBOutlet var NameText: UITextField!
override func viewDidLoad() {
    super.viewDidLoad()

}

@IBAction func homeScreen(sender: AnyObject) {
    let name = self.NameText.text
    var html = "<p>" + name + "</p>"
    let plainData = (html as NSString).dataUsingEncoding(NSUTF8StringEncoding)
    let base64String = plainData!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
    let concat = "data:text/html;base64," + base64String
    print(concat)
    UIApplication.sharedApplication().openURL(NSURL(string: concat)!)
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}