has no member ' 'のエラーメッセージが消えない

ブラウザ構築をしているのですが、下記のソース上でhas no member 'showAlert'のエラーメッセージが消えません。。



import UIKit

class ViewController: UIViewController, UIWebViewDelegate,UITextFieldDelegate {
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var webView: UIWebView!
    @IBOutlet weak var backButton: UIBarButtonItem!
    @IBOutlet weak var forwardButton: UIBarButtonItem!
    @IBOutlet weak var activityIndicatorView: UIActivityIndicatorView!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.webView.delegate = self
        self.textField.delegate = self
        
        // Do any additional setup after loading the view, typically from a nib.
        let startUrl = "http://dotinstall.com"
//        if let url = NSURL(string: startUrl){
//            let urlRequest = NSURLRequest(URL: url)
//            self.webView.loadRequest(urlRequest)
//        }
        
        self.jumpTourl(startUrl)
        self.setupButtonsEnabled()
        self.activityIndicatorView.hidesWhenStopped = true
        
    }
    
    func jumpTourl(urlString: String){
        if let url = NSURL(string: urlString){
        let urlRequest = NSURLRequest(URL: url)
        self.webView.loadRequest(urlRequest)
        } else {
            self.showAlert("Invalid URL")
        }
        
    
    
    func showAlert(message: String){
//        >= ios8
        let alertController = UIAlertController(title: "Error", message: message, preferredStyle: .Alert)
        let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
        alertController.addAction(defaultAction)
        self.presentViewController(alertController, animated: true, completion: nil)
    }
    
        
        var urlString = self.textField.text
        urlString = urlString!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
        if urlString == "" {
//            alert
            self.showAlert("Please enter URL")
        } else {
//            jumpTourl
            self.jumpTourl(urlString!)
            self.setupButtonsEnabled()
        }
        self.textField.resignFirstResponder()
        return true
    }
    
    func setupButtonsEnabled(){
        self.backButton.enabled = self.webView.canGoBack
        self.forwardButton.enabled = self.webView.canGoForward

    }
    
    func webViewDidStartLoad(webView: UIWebView) {
        self.activityIndicatorView.startAnimating()
    }
    
    func webViewDidFinishLoad(webView: UIWebView) {
        self.activityIndicatorView.stopAnimating()
        self.setupButtonsEnabled()
        if let urlString = self.webView.request?.URL!.absoluteString{
                self.textField.text = urlString
        }
    }
    
        

    

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    
        }
    
    @IBAction func goBack(sender: AnyObject) {
        self.webView.goBack()
    }
    @IBAction func goForward(sender: AnyObject) {
        self.webView.goForward()
    }
    @IBAction func reload(sender: AnyObject) {
        self.webView.reload()
    }

}

お分かりの方いらっしゃいましたらご教授をお願い致します。

行動規範の内容に同意します

回答1件

ベストアンサー

以下のshowAlertメソッドがjumpTourlメソッドの中で記述されているので、jumpTourlメソッドのブロック{}の外に出してみてください。

swift
1func jumpTourl(urlString: String){
2    if let url = NSURL(string: urlString){
3        let urlRequest = NSURLRequest(URL: url)
4        self.webView.loadRequest(urlRequest)
5    } else {
6        showAlert("Invalid URL")
7    }
8    
9    var urlString = self.textField.text
10    urlString = urlString!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
11    if urlString == "" {
12        //            alert
13        showAlert("Please enter URL")
14    } else {
15        //            jumpTourl
16        self.jumpTourl(urlString!)
17        self.setupButtonsEnabled()
18    }
19    self.textField.resignFirstResponder()
20    return true
21}
22
23func showAlert(message: String){
24    //        >= ios8
25    let alertController = UIAlertController(title: "Error", message: message, preferredStyle: .Alert)
26    let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
27    alertController.addAction(defaultAction)
28    self.presentViewController(alertController, animated: true, completion: nil)
29}
30

メソッドの中で他のメソッドを呼ぶには、呼び出す前にメソッドを定義していないとだめなので、先頭で定義して呼び出し時にselfを付けないと以下のように使用できます。

swift
1func jumpTourl(urlString: String){
2    
3    func showAlert(message: String){
4        //        >= ios8
5        let alertController = UIAlertController(title: "Error", message: message, preferredStyle: .Alert)
6        let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
7        alertController.addAction(defaultAction)
8        self.presentViewController(alertController, animated: true, completion: nil)
9    }
10    
11    
12    if let url = NSURL(string: urlString){
13        let urlRequest = NSURLRequest(URL: url)
14        self.webView.loadRequest(urlRequest)
15    } else {
16        showAlert("Invalid URL")
17    }
18    
19    
20    var urlString = self.textField.text
21    urlString = urlString!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
22    if urlString == "" {
23        //            alert
24        showAlert("Please enter URL")
25    } else {
26        //            jumpTourl
27        self.jumpTourl(urlString!)
28        self.setupButtonsEnabled()
29    }
30    self.textField.resignFirstResponder()
31    return true
32}
33