试试这个，而不是使用密钥发布JSON字符串，您需要将其作为数据发布到您的脚本中以便读入。目前在您的脚本中，您甚至不使用$ handle ...

Try this, instead of posting the JSON string with a key, you need to post it as Data to your script to be read in. Currently in your script you aren't even using $handle for anything...

NSURL *link = [NSURL URLWithString:[phpUrl     stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:link];
[request appendPostData:[jsonString  dataUsingEncoding:NSUTF8StringEncoding]]; 
[request setTimeOutSeconds:120];
[request setDelegate:self];

和你的PHP代码..

And your php code..

$handle = fopen('php://input','r');
$jsonInput = fgets($handle);
$decoded = json_decode($jsonInput,true);
print_r($decoded);