在“時崩潰” <null> “在SWIFT收到來自api的回復

Question

獲取圖像url null作為來自api的響應，是否有任何方法可以解決它。 來自api的回復是：

"image_path" = "<null>";

試圖像這樣處理它：

if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") is NSNull) {
            // optional is NOT NULL, neither NIL nor NSNull
        }

它還在崩潰請指導。 更新：

發現問題，null實際上不是問題。 發布以下回復以明確說明。

media =             (
                            {
                id = "97eb48a0-429a-11e6-873c-ad7b848648f1";
                "image_path" = "https://s3-eu-west-1.mazws.com/facebook_profile_images/15105131.png";
                "room_post_id" = "97c572e0-429a-11e6-b72b-fd489f63a1fc";
                "user_id" = "66fe22a0-4296-11e6-a1d9-69dc307add4b";
                "video_path" = "<null>";
            },
                            {
                id = "981a6880-429a-11e6-b039-736a0bf954dc";
                "image_path" = "<null>";
                "room_post_id" = "97c572e0-429a-11e6-b72b-fd489f63a1fc";
                "user_id" = "66fe22a0-4296-11e6-a1d9-69dc307add4b";
                "video_path" = "https://s3-eu-west-1.naws.com/facebook_profile_images/1255803.mp4";
            }
        );

這是正常的響應，現在是麻煩的響應：

media =             (
        );

可以處理任何方式嗎？ 請指導。

Answer 1

試試這樣..它不會崩潰

if let imgPath = arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valu‌​eForKey("image_path") as? String {

//... your value is string 

}

Answer 2

讓我根據您提供的信息猜測類型：

if let arrList = arrList as? NSArray,
    firstObject = arrList.objectAtIndex(indexPath.row) as? NSDictionary,
    media = firstObject.valueForKey("media") as? NSArray,
    secondObject = media.objectAtIndex(0) as? NSDictionary,
    image_path = secondObject.valueForKey("image_path") as? String {

    print(image_path)
    // now validate your string
}

驗證您的字符串可以是這樣的：

if !image_path.isEmpty && image_path != "<null>" {
    //do something
}

或者像這樣：

if !image_path.isEmpty {
    if let image_pathURL = NSURL(string: image_path), _ = image_pathURL.host {
        //do something
    }
}

Answer 3

為什么不用==來簡單檢查：

if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") == "<null>")

Answer 4

if let image = myJson["image_path"] as? String {
  imageView.image = image
}
else {
  imageview.image = "default.png"
}

也嘗試這個

if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") == "<null>") {
            // optional is NOT NULL, neither NIL nor NSNull
        }