在哪里可以找到最新的实时汇率？ [英] Where can I find updated, live exchange rates?

问题描述

如何将实时货币汇率链接到我的iPhone应用程序？首先，有人知道我可以获取汇率的任何网站吗？其次，如何将其链接到我的应用程序？我想做这个程序的工作。 http://the-dream.co.uk/currencee/

How do I link live currency exchange rates to my iPhone app? First, anyone know any sites where I can get the exchange rates? And second, how do I link that to my app? I want to do what this app does. http://the-dream.co.uk/currencee/

推荐答案

这是博客文章，但是，如果您使用 TBXML 可以使用以下方法进行。

Here is a blog post about this, however to recap, if you use TBXML you can do it with the methods below.

它们执行以下操作：

1. 假设您已将可变字典对象作为名为 exchangeRates
的类属性， li>将欧元设置为基本汇率（值1.0）

2. 调用欧洲中央银行的汇率XML提要并对其进行解析。



3. 调用loadExchangeRates（）方法后，您可以通过以下操作获得特定汇率：

1. Assume you have made a mutable dictionary object as a class property called exchangeRates
2. Set's EUR as the base rate (value of 1.0)
3. Call the European Central Bank's exchange rate XML feed and parses it.

4. After you've called the loadExchangeRates() method you can obtain a specific exchange rate by doing:

NSDecimalNumber *rate = [NSDecimalNumber decimalNumberWithString:[self.exchangeRates objectForKey:@"USD"]];  

以下是方法：

- (void)loadExchangeRates {

// initialize rate array
exchangeRates = [[NSMutableDictionary alloc] init];

// Load and parse the rates.xml file
TBXML * tbxml = [[TBXML tbxmlWithURL:[NSURL URLWithString:@"http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml"]] retain];

// If TBXML found a root node, process element and iterate all children
if (tbxml.rootXMLElement)
    [self traverseElement:tbxml.rootXMLElement];

// add EUR to rate table
[exchangeRates setObject:@"1.0" forKey:@"EUR"];

// release resources
[tbxml release];    }


- (void) traverseElement:(TBXMLElement *)element {

    do {
        // Display the name of the element
        //NSLog(@"%@",[TBXML elementName:element]);

        // Obtain first attribute from element
        TBXMLAttribute * attribute = element->firstAttribute;

        // if attribute is valid
        NSString *currencyName;
        while (attribute) {
            /* Display name and value of attribute to the log window
            NSLog(@"%@->%@ = %@",
                  [TBXML elementName:element],
                  [TBXML attributeName:attribute],
                  [TBXML attributeValue:attribute]);
            */
            // store currency
            if ([[TBXML attributeName:attribute] isEqualToString: @"currency"]) {
                currencyName = [TBXML attributeValue:attribute];
            }else if ([[TBXML attributeName:attribute] isEqualToString: @"rate"]) {
                // store currency and rate in dictionary
                [exchangeRates setObject:[TBXML attributeValue:attribute] forKey:currencyName];
            }
            // Obtain the next attribute
            attribute = attribute->next;
        }

        // if the element has child elements, process them
        if (element->firstChild)
            [self traverseElement:element->firstChild];

        // Obtain next sibling element
    } while ((element = element->nextSibling));
}

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