uiwebview – 简单的Swift WebView无法正常工作(Xcode 6 Beta 3)

我在 Swift中编写了一个简单的WebView,但每当我尝试在iOS模拟器中启动它时,我都会遇到这些错误.出了什么问题？

import UIKit

class ViewController: UIViewController {

@IBOutlet var webview: UIWebView

var urlpath = "http://www.google.de"

func loadAddressURL(){
    let requesturl = NSURL(string: urlpath)
    let request = NSURLRequest(URL: requesturl)
    webview.loadRequest(request)
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    loadAddressURL()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

错误：

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
self    uiwebview.ViewController    0x7987fc70  0x7987fc70
request NSURLRequest *  0x78ebfc40  0x78ebfc40
requesturl  NSURL * ""  0x78ec0040

您只是没有将UIWebView连接到webview类属性

打开助手编辑器,在左侧显示你的xib或故事板,在右边显示你的视图控制器源文件,点击webview属性左边的圆圈并拖动到UIWebView控件.建立连接后,运行应用程序,它现在应该可以正常工作