如何从swift调用rest web服务

Question

JSON似乎打印到浏览器窗口，所以我不完全确定这种方法有什么问题？请谁能提供一些帮助，为什么这可能不起作用？

谢谢

    var url : String = "http://www.flickr.com/services/rest/?method=flickr.test.echo&format=json&api_key=d6e995dee02d313a28ed4b799a09b869"
    var request : NSMutableURLRequest = NSMutableURLRequest()
    request.URL = NSURL(string: url)
    request.HTTPMethod = "GET"

    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue(), completionHandler:{ (response:NSURLResponse!, data: NSData!, error: NSError!) -> Void in
        var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
        let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary

        if (jsonResult != nil) {
            println(jsonResult);
        } else {
            // couldn't load JSON, look at error
            println(error);
        }
    })

Answer 1

问题是，调用返回的数据是JSONP，而不是JSON

如果使用正确的JSON（如http://ip.jsontest.com）进行测试，您的代码将正常工作

要使其与Flickr一起工作，您必须对其进行如下修改：

var json_str:NSString = NSString(data: data, encoding: NSUTF8StringEncoding)


json_str = json_str.substringFromIndex(14)
json_str = json_str.substringToIndex(json_str.length-1)

let new_data:NSData = json_str.dataUsingEncoding(NSUTF8StringEncoding)!


var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(new_data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary

if (jsonResult != nil) {
    println(jsonResult);
} else {
    // couldn't load JSON, look at error
    println(error);
}