Question

大家好，我是iphone开发的新手。我正在做一些应用，我被卡住了......我有一个文本域，按钮和webview ..

我有一个已解析的json文件..

我想在文本字段中输入一个字符串或方法，它存在于JSON文件中。它应该与json文件中的方法匹配，并且应该在webview上显示方法的内容..

我已经完成了按钮和webview ...我想进一步扩展textfield和webview ..

我们怎么做？请用示例代码建议我......

//代码

 - (void)loadData
    {
        dataWebService = [[NSMutableData data] retain];

        NSURLRequest *request = [[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://api.kivaws.org/v1/loans/search.json?status=fundraising"]]retain];  

          [[NSURLConnection alloc]initWithRequest:request delegate:self];
    }


    -(void)connectionDidFinishLoading:(NSURLConnection *)connection
    {
        [connection release];    
        NSString *responseString = [[NSString alloc] initWithData:dataWebService encoding:NSUTF8StringEncoding];

        self.dataWebService = nil;

        NSArray* latestLoans = [(NSDictionary*) [responseString JSONValue] objectForKey:@"loans"]; 

        [responseString release];    

        NSDictionary* loan = [latestLoans objectAtIndex:0];

        //fetch the data
        NSNumber* fundedAmount = [loan objectForKey:@"funded_amount"];

        NSNumber* loanAmount = [loan objectForKey:@"loan_amount"];

        float outstandingAmount = [loanAmount floatValue] - [fundedAmount floatValue];

        NSString* name = [loan objectForKey:@"name"];

        NSString* country = [(NSDictionary*)[loan objectForKey:@"location"] objectForKey:@"country"];

        //set the text to the label
        label.numberOfLines = 0;

        label.text = [NSString stringWithFormat:@"Latest loan: %@ \n \n country:  %@ \n \n amount: $%.2f", name,country,outstandingAmount];
 }

Answer 1

我想你问的是：“如何在文本字段中输入部分网址，并将其附加到基本网址并加载到网页视图中？”

如果是这样，你可以很容易地做到。如果您的文本字段名为“textfield”，webview称为“webview”，请执行以下操作：

NSString *baseUrl = @"http://whatever.com";
NSString *fullUrl = [baseUrl stringByAppendingString:textfield.text];
[webview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:fullUrl]]];

按下按钮或使用UITextFieldDelegate的- (BOOL)textFieldShouldReturn:(UITextField *)textField

触发它

修改：

您希望根据您在文本字段中指定的键从NSDictionary中检索JSON生成的值。首先，做

NSString *value = [dictionary objectForKey:textfield.text];

获取值（假设它是一个字符串）。然后，您希望在Webview中显示该值。您可以使用loadHTMLString:baseURL:或使用javascript通过stringByEvaluatingJavaScriptFromString:（UIWebView的两种方法）执行此操作。如果你想使用loadHTMLString，你可以放入

NSString *html = [NSString stringWithFormat:@"<html><body>%@</body></html>", value]; [webview loadHTMLString:html baseURL:nil];

我们可以从json文件中检索特定方法并在UI上显示它吗？

1 个答案: