如何处理iOS Web视图本机键盘上的返回键？ [英] How do I handle return key on an iOS web view native keyboard?

问题描述

在我的iOS应用中，我有一个带文本字段的UIWebView。我想回复被点击的Return键。我该怎么做？

In my iOS app, I have a UIWebView with text fields . I'd like to respond to the Return key being tapped. How do I do that?

我可以以某种方式访问​​UITextField以便我可以实现UITextFieldDelegate方法textFieldShouldReturn吗？或者还有其他方法可以实现这一目标吗？

Can I somehow get access to the UITextField so I can implement UITextFieldDelegate method textFieldShouldReturn? Or is there some other way to accomplish this?

推荐答案

你需要为此做一些JavaScript技巧。

You need to do some JavaScript tricks for this.

在你的HTML文档中，绑定一个用于文本输入控件的keyup事件回调，（上次我检查时，UIWebView不会为返回键触发keypress事件，所以keyup事件是你最好的替代）

In your HTML document, bind a keyup event callback for your text input control, (Last time I checked, somehow UIWebView doesn't fire keypress event for return key, so keyup event is your best alternative)

在此回调中，让Web视图转到自定义URL方案。例如：

In this callback, let the web view goto a custom URL scheme. e.g below:

var input = document.getElementById('textInput');
input.onkeyup = function(){window.location = 'callback://keyup'};

然后你可以在UIWebView的委托中处理这个URL方案

Then you can handle this URL scheme in you UIWebView's delegate

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if ([request.URL.scheme isEqualToString:@"callback"]) {
        // Do what you want

        return NO;
    }

    return YES;
}

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