Question

JSON：

{"status":"ok","count":4,"count_total":4,"pages":1,"posts":[{"id":15,"type":"post","slug":"sg-and-t13-friends-again","url":"http:\/\/example.com.com\/instanews\/sg-and-t13-friends-again\/","status":"publish","title":"SG and T13 friends again","title_plain":"SG and T13 friends again","content":"<p>again?<\/p>\n","excerpt":"<p>again?<\/p>\n","date":"2014-10-08 20:28:52","modified":"2014-10-08 20:28:52","categories":[{"id":2,"slug":"selena-gomez","title":"Selena Gomez","description":"","parent":0,"post_count":3},{"id":3,"slug":"taylor-swift","title":"Taylor Swift","description":"","parent":0,"post_count":2}],"tags":[],"author":{"id":1,"slug":"admin","name":"admin","first_name":"","last_name":"","nickname":"admin","url":"","description":""},"comments":[],"attachments":[{"id":16,"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","slug":"tumblr_nc5rkwqj1r1tv3z6lo1_500","title":"tumblr_nc5rkwQj1R1tv3z6lo1_500","description":"","caption":"","parent":15,"mime_type":"image\/png","images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-150x150.png","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-238x300.png","width":238,"height":300},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-360x200.png","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-360x360.png","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-500x420.png","width":500,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630}}}],"comment_count":0,"comment_status":"open","thumbnail":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-150x150.png","custom_fields":{"vw_review_average_score":["0"],"vw_post_featured":["0"],"vw_post_layout":["right"],"vw_enable_review":["0"]},"thumbnail_size":"thumbnail","thumbnail_images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-150x150.png","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-238x300.png","width":238,"height":300},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-360x200.png","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-360x360.png","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500-500x420.png","width":500,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_nc5rkwQj1R1tv3z6lo1_500.png","width":500,"height":630}}},{"id":9,"type":"post","slug":"selena-gomez-new-trailer","url":"http:\/\/example.com.com\/instanews\/selena-gomez-new-trailer\/","status":"publish","title":"Selena Gomez new trailer","title_plain":"Selena Gomez new trailer","content":"<p>Not really\u00a0&#8220;Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.&#8221;<\/p>\n","excerpt":"<p>Not really\u00a0&#8220;Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, &#8230;<\/p>\n","date":"2014-10-08 20:22:02","modified":"2014-10-08 20:25:19","categories":[{"id":2,"slug":"selena-gomez","title":"Selena Gomez","description":"","parent":0,"post_count":3}],"tags":[],"author":{"id":1,"slug":"admin","name":"admin","first_name":"","last_name":"","nickname":"admin","url":"","description":""},"comments":[],"attachments":[{"id":11,"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842.jpg","slug":"img_1842","title":"IMG_1842","description":"","caption":"","parent":9,"mime_type":"image\/jpeg","images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842.jpg","width":1280,"height":1024},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-300x240.jpg","width":300,"height":240},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-1024x819.jpg","width":1024,"height":819},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-750x420.jpg","width":750,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-750x750.jpg","width":750,"height":750},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-1140x641.jpg","width":1140,"height":641}}}],"comment_count":0,"comment_status":"open","thumbnail":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-150x150.jpg","custom_fields":{"vw_review_average_score":["0"],"vw_post_featured":["0"],"vw_post_layout":["right"],"vw_enable_review":["0"]},"thumbnail_size":"thumbnail","thumbnail_images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842.jpg","width":1280,"height":1024},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-300x240.jpg","width":300,"height":240},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-1024x819.jpg","width":1024,"height":819},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-750x420.jpg","width":750,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-750x750.jpg","width":750,"height":750},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/IMG_1842-1140x641.jpg","width":1140,"height":641}}},{"id":7,"type":"post","slug":"taylor-swift-new-album","url":"http:\/\/example.com.com\/instanews\/taylor-swift-new-album\/","status":"publish","title":"Taylor Swift new album","title_plain":"Taylor Swift new album","content":"<p>3 weeks!\u00a0Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.<\/p>\n<p>Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.<\/p>\n","excerpt":"<p>3 weeks!\u00a0Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, &#8230;<\/p>\n","date":"2014-10-08 20:21:20","modified":"2014-10-08 20:27:44","categories":[{"id":3,"slug":"taylor-swift","title":"Taylor Swift","description":"","parent":0,"post_count":2}],"tags":[],"author":{"id":1,"slug":"admin","name":"admin","first_name":"","last_name":"","nickname":"admin","url":"","description":""},"comments":[],"attachments":[{"id":14,"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","slug":"tumblr_ncqmsrndkv1rx2xpto1_500","title":"tumblr_ncqmsrndkV1rx2xpto1_500","description":"","caption":"","parent":7,"mime_type":"image\/jpeg","images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-231x300.jpg","width":231,"height":300},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-500x420.jpg","width":500,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-500x641.jpg","width":500,"height":641}}}],"comment_count":0,"comment_status":"open","thumbnail":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-150x150.jpg","custom_fields":{"vw_review_average_score":["0"],"vw_post_featured":["0"],"vw_post_layout":["right"],"vw_enable_review":["0"]},"thumbnail_size":"thumbnail","thumbnail_images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-231x300.jpg","width":231,"height":300},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-500x420.jpg","width":500,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500.jpg","width":500,"height":648},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/tumblr_ncqmsrndkV1rx2xpto1_500-500x641.jpg","width":500,"height":641}}},{"id":5,"type":"post","slug":"selena-gomez-reported-pregnant","url":"http:\/\/example.com.com\/instanews\/selena-gomez-reported-pregnant\/","status":"publish","title":"Selena Gomez reported pregnant","title_plain":"Selena Gomez reported pregnant","content":"<p>yolo? fake!<\/p>\n","excerpt":"<p>yolo? fake!<\/p>\n","date":"2014-10-08 20:20:17","modified":"2014-10-08 20:26:23","categories":[{"id":2,"slug":"selena-gomez","title":"Selena Gomez","description":"","parent":0,"post_count":3}],"tags":[],"author":{"id":1,"slug":"admin","name":"admin","first_name":"","last_name":"","nickname":"admin","url":"","description":""},"comments":[],"attachments":[{"id":12,"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","slug":"selena-gomez-photoshoot","title":"Selena Gomez - Photoshoot","description":"","caption":"","parent":5,"mime_type":"image\/jpeg","images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-300x225.jpg","width":300,"height":225},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-720x420.jpg","width":720,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541}}}],"comment_count":0,"comment_status":"open","thumbnail":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-150x150.jpg","custom_fields":{"vw_review_average_score":["0"],"vw_post_featured":["0"],"vw_post_layout":["right"],"vw_enable_review":["0"]},"thumbnail_size":"thumbnail","thumbnail_images":{"full":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"thumbnail":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-150x150.jpg","width":150,"height":150},"medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-300x225.jpg","width":300,"height":225},"large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"vw_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-360x200.jpg","width":360,"height":200},"vw_square_small":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-360x360.jpg","width":360,"height":360},"vw_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot-720x420.jpg","width":720,"height":420},"vw_square_medium":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541},"vw_large":{"url":"http:\/\/example.com.com\/instanews\/wp-content\/uploads\/Selena-Gomez-Photoshoot.jpg","width":720,"height":541}}}],"query":{"ignore_sticky_posts":true}}

我试图从第一篇文章中全面了解情况。我的解决方案（有效）：

let urlPath = "http://example.com/instanews/api/get_posts/"
    let url: NSURL = NSURL(string: urlPath)
    let session = NSURLSession.sharedSession()
    let task = session.dataTaskWithURL(url, completionHandler: {data, response, error -> Void in
        println("Task completed")
        if((error) != nil) {
            // If there is an error in the web request, print it to the console
            println(error.localizedDescription)
        }
        var err: NSError?
        var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
        if(err != nil) {
            // If there is an error parsing JSON, print it to the console
            println("JSON Error \(err!.localizedDescription)")
        } else {
            var result: AnyObject = jsonResult["posts"]! as NSArray
            var result2: AnyObject = result[0]!
            var result3: AnyObject = result2["attachments"]!!
            var result4: AnyObject = result3[0]!
            var result5: AnyObject = result4["images"]!!
            var result6: AnyObject = result5["full"]!!
            var result7: AnyObject = result6["url"]!!
            println(result7)

        }

    })
    task.resume()

我对那些变化结果不满意等等。这显然不是正确的方法。我不太确定为什么我们只能使用结果[＆＃34;帖子＆＃34;] [0]并将其堆叠起来。

还有，请你解释一下为什么有时会有双重感叹号？我知道它是强行打开的，但为什么它会加倍？

谢谢！

Answer 1

您可以考虑使用一些可以利用Optional语义的本机swift json库，例如https://github.com/owensd/json-swift

然后您的代码可以重写为

if let result7 = jsonResult["posts"]["attachments"]["images"]["full"]["url"].string {
    println(result7)
}

进入JSON目录？

1 个答案: