在Swift中解析json时出错

Question

我在尝试从Google博客解析某些JSON时出错。

我收到的错误是

'Invalid conversion from throwing function of type '(_, _, _) throws -> Void' to non-throwing function type '(NSData?, NSURLResponse?, NSError?) -> Void' 

我身边有一派，我知道这是什么做追赶的错误，但我想不出它到底是什么，任何帮助将不胜感激：

import UIKit 
import CoreData 

class MasterViewController: UITableViewController { 

var detailViewController: DetailViewController? = nil 
override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    let url = NSURL(string: "https://www.googleapis.com/blogger/v3/blogs/10861780/posts?key=AIzaSyBwmI4AzMnBmr7oSVeL0EHdzMjXV1aATnQ") 

    let session = NSURLSession.sharedSession() 

    let task = session.dataTaskWithURL(url!, completionHandler: { (data, response, error) -> Void in 
    if error != nil { 
      print(error) 
     } else { 
      //print(NSString(data: data!, encoding: NSUTF8StringEncoding)) 

      do { 

      let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary 
      if jsonResult.count > 0 { 

       if let items = jsonResult["items"] as? NSArray { 
        for items in items { 
         print(items) 

        } 

Answer 1

试试这个。我纠正了你的错误，只加了一些括号。

override func viewDidLoad() { 
    super.viewDidLoad() 

let url = NSURL(string: "https://www.googleapis.com/blogger/v3/blogs/10861780/posts?key=AIzaSyBwmI4AzMnBmr7oSVeL0EHdzMjXV1aATnQ") 

let session = NSURLSession.sharedSession() 

let task = session.dataTaskWithURL(url!, completionHandler: { (data, response, error) -> Void in 

    if error != nil { 
    print(error) 
    } else { 
    //print(NSString(data: data!, encoding: NSUTF8StringEncoding)) 
    do { 

     let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions(rawValue: 0)) as! NSDictionary 
     if jsonResult.count > 0 { 

     if let items = jsonResult["items"] as? NSArray { 
      for items in items { 
      print(items) 

      } 
     } 
     } 
    } catch let error as NSError { 
     print(error) 
    } 
    } 
}) 
    task.resume() 

} // end braces of view did load 

Answer 2

试试这个，

do { 
     let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary 
     if jsonResult.count > 0 { 

      if let items = jsonResult["items"] as? NSArray { 
       for items in items { 
        print(items) 

       } 
      } 
    }catch{ 
      print("Something wrong") 
     } 

并替换该行

let task = session.dataTaskWithURL(url!, completionHandler: { (data, response, error) -> Void in 

与

let task = session.dataTaskWithRequest(request) { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in