xcode webViewDidFinishLoad 不触发称为工作
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webViewDidFinishLoad not firing called working
提问by kmiklas
(Swift, iOS8, Xcode6, iPhone/iPad)
(Swift, iOS8, Xcode6, iPhone/iPad)
webViewDidFinishLoadis not being called, is not firing, and is not working.
webViewDidFinishLoad没有被调用，没有触发，也没有工作。
Yes, I have set the containing view controller as the delegate. I CTRL-mousedowned on the UIWebView, dragged up to the little yellow circle representing the view controller, and released. A right-click on the UIWebView object shows that the delegate is set.
是的，我已将包含视图控制器设置为委托。我在 UIWebView 上按住 CTRL 鼠标，拖动到代表视图控制器的黄色小圆圈，然后释放。右键单击 UIWebView 对象显示委托已设置。
Yes, I did implement UIWebViewDelegatein my class declaration, like so:
是的，我确实UIWebViewDelegate在我的类声明中实现了，如下所示：
class Paragraph: UIViewController, UIWebViewDelegate {
Yes, I did restart Xcode, and test on both the simulator and an actual iPhone 4S.
是的，我确实重新启动了 Xcode，并在模拟器和实际的 iPhone 4S 上进行了测试。
The request looks like this:
请求如下所示：
@IBOutlet var paragraph : UIWebView = nil
var r = NSBundle.mainBundle().pathForResource("cheddar", ofType: "htm")
var u = NSURL(fileURLWithPath: r)
paragraph.loadRequest(NSURLRequest(URL: u))
The callback function looks like this:
回调函数如下所示：
func webViewDidFinishLoad() {
println("webViewDidFinishLoad")
}
回答by kmiklas
I got it. The callback was missing a parameter. For posterity:
我知道了。回调缺少参数。为后人：
func webViewDidFinishLoad(webView: UIWebView!) {
Note the webView: UIWebView!parameter
注意webView: UIWebView!参数
In this case, perhaps even more important, is the way I found the bug. I created an entirely new view controller, and pieced it back together, carefully checking at each step to make sure that I didn't miss anything.
在这种情况下，也许更重要的是我发现错误的方式。我创建了一个全新的视图控制器，并将其拼凑起来，在每一步都仔细检查以确保我没有遗漏任何东西。
When the Intellisense popup showed the function with the parameter, I saw my error.
当 Intellisense 弹出窗口显示带有参数的函数时，我看到了我的错误。
NOTE: In Swift 2.2, the UIWebViewDelegate protocol specifies a different optionality:
webView: UIWebView.
webView: UIWebView!spawns a warning.
注意：在 Swift 2.2 中， UIWebViewDelegate 协议指定了不同的可选性：
webView: UIWebView.
webView: UIWebView!产生警告。
