目标是将来自php的json_encode结果显示为swift作为标签。我参考了许多使用swift解析json的教程和实践,但我仍然无法理解这个问题。
我引用了一个使用date.jsontest.com的示例,并且工作正常。
在我的项目中,我已经解析了这个简单的JSON对象:
[{"username":"user"}]
这是快速代码:
override func viewDidLoad() {
super.viewDidLoad()
// 1
//let urlAsString = "http://date.jsontest.com"
let urlAsString = "http://(ip address)/service.php"
let url = NSURL(string: urlAsString)!
let urlSession = NSURLSession.sharedSession()
// 2
let jsonQuery = urlSession.dataTaskWithURL(url, completionHandler: { data, response, error -> Void in
if (error != nil) {
println(error.localizedDescription)
}
var err: NSError?
// 3
var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
if (err != nil) {
println("JSON Error \(err!.localizedDescription)")
}
// 4
//let jsonDate: String! = jsonResult["date"] as NSString
//let jsonId = jsonResult["id"] as NSString
//let jsonTime: String! = jsonResult["time"] as NSString
let jsonUser: String! = jsonResult[0] as NSString
dispatch_async(dispatch_get_main_queue(), {
//self.dateLabel.text = jsonId
//self.timeLabel.text = jsonUser
self.dateLabel.text = jsonUser
})
})
// 5
jsonQuery.resume()
//searchItunesFor("JQ Software")
//startConnection()
// Do any additional setup after loading the view, typically from a nib.
}
当我使用http://date.jsontest.com
作为字符串以及jsonDate
和jsonTime
时,代码运行正常。
我试图了解Xcode中的调试器,但作为Swift的新用户,很难理解问题所在。我可以根除的是我的JSON格式化存在问题。
非常感谢任何提示,谢谢。
编辑:
这是代码http://(ip地址)/service.php,它给了我JSON
<?php
//connect to MySQL
// Create connection
$con=mysqli_connect($hostname,$username,$password,$database);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// This SQL statement selects ALL from the table 'Locations'
$sql = "SELECT username FROM members WHERE id = 1";
// Check if there are results
if ($result = mysqli_query($con, $sql))
{
// If so, then create a results array and a temporary one
// to hold the data
$resultArray = array();
$tempArray = array();
// Loop through each row in the result set
while($row = $result->fetch_object())
{
// Add each row into our results array
$tempArray = $row;
array_push($resultArray, $tempArray);
}
// Finally, encode the array to JSON and output the results
echo json_encode($resultArray);
}
// Close connections
mysqli_close($con);
?>