javascript - 从加载的 WebView 获取页面标题

Question

我正在尝试将 UILabel pageTitle 更改为 UIWebView 上显示的页面标题。我没有返回任何警告或错误，它只是没有改变。

视图控制器.h

@interface ViewController : UIViewController <UITextFieldDelegate, UIWebViewDelegate, UIActionSheetDelegate> {
    UIWebView *_webView;
    UILabel *_pageTitle;

}

@property (nonatomic, retain) IBOutlet UIWebView *webView;
@property (nonatomic, retain) IBOutlet UILabel *pageTitle;

@end

视图控制器.m

- (void)webViewDidFinishLoad:(UIWebView *)webView {

    self.pageTitle.text = [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
    [_webView setDelegate:self];

}

IB截图

Answer 1

您应该[_webView setDelegate:self];在viewdidLoad/下调用，loadView以便它可以调用 UIWebViewDelegate