ios 如何使用 SwiftyJSON 遍历 JSON？
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How to loop through JSON with SwiftyJSON?
提问by Cherif
I have a json that I could parse with SwiftyJSON :
我有一个可以用 SwiftyJSON 解析的 json：
if let title = json["items"][2]["title"].string {
println("title : \(title)")
}
Works perfectly.
完美运行。
But I couldn't loop through it. I tried two methods, the first one is
但我无法遍历它。我尝试了两种方法，第一种是
// TUTO :
//If json is .Dictionary
for (key: String, subJson: JSON) in json {
...
}
// WHAT I DID :
for (key: "title", subJson: json["items"]) in json {
...
}
XCode didn't accept the for loop declaration.
XCode 不接受 for 循环声明。
The second method :
第二种方法：
// TUTO :
if let appArray = json["feed"]["entry"].arrayValue {
...
}
// WHAT I DID :
if let tab = json["items"].arrayValue {
...
}
XCode didn't accept the if statement.
XCode 不接受 if 语句。
What am I doing wrong ?
我究竟做错了什么 ？
回答by rintaro
If you want loop through json["items"]array, try:
如果要循环遍历json["items"]数组，请尝试：
for (key, subJson) in json["items"] {
if let title = subJson["title"].string {
println(title)
}
}
As for the second method, .arrayValuereturns nonOptionalarray, you should use .arrayinstead:
至于第二种方法，.arrayValue返回非Optional数组，你应该.array改用：
if let items = json["items"].array {
for item in items {
if let title = item["title"].string {
println(title)
}
}
}
回答by CularBytes
I Find it a bit strange explained myself, because actually using:
我觉得自己解释的有点奇怪，因为实际使用的是：
for (key: String, subJson: JSON) in json {
//Do something you want
}
gives syntax errors (in Swift 2.0 atleast)
给出语法错误（至少在 Swift 2.0 中）
correct was:
正确的是：
for (key, subJson) in json {
//Do something you want
}
Where indeed key is a string and subJson is a JSON object.
其中 key 确实是一个字符串，而 subJson 是一个 JSON 对象。
However I like to do it a little bit different, here is an example:
但是我喜欢做一些不同的事情，这是一个例子：
//jsonResult from API request,JSON result from Alamofire
if let jsonArray = jsonResult?.array
{
//it is an array, each array contains a dictionary
for item in jsonArray
{
if let jsonDict = item.dictionary //jsonDict : [String : JSON]?
{
//loop through all objects in this jsonDictionary
let postId = jsonDict!["postId"]!.intValue
let text = jsonDict!["text"]!.stringValue
//...etc. ...create post object..etc.
if(post != nil)
{
posts.append(post!)
}
}
}
}
回答by Dhruv Ramani
In the for loop, the type of keycan't be of the type "title". Since "title"is a string, go for : key:String. And then Inside the Loop you can specifically use "title"when you need it. And also the type ofsubJsonhas to be JSON.
在 for 循环中，类型key不能是类型"title"。因为"title"是一个字符串，所以去 : key:String。然后在循环内部，您可以"title"在需要时专门使用它。而且类型subJson必须是JSON.
And Since a JSON file can be considered as a 2D array, the json["items'].arrayValuewill return multiple objects. It is highly advisable to use : if let title = json["items"][2].arrayValue.
并且由于可以将 JSON 文件视为二维数组，因此json["items'].arrayValue将返回多个对象。强烈建议使用 : if let title = json["items"][2].arrayValue。
Have a look at : https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html
看看：https: //developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html
回答by tangplin
回答by 2rahulsk
you can iterate through the json by:
您可以通过以下方式遍历 json：
for (_,subJson):(String, JSON) in json {
var title = subJson["items"]["2"]["title"].stringValue
print(title)
}
have a look at the documentation of SwiftyJSON. https://github.com/SwiftyJSON/SwiftyJSONgo through the Loop section of the documentation
看看 SwiftyJSON 的文档。 https://github.com/SwiftyJSON/SwiftyJSON浏览文档的循环部分
