ios - 如何使用 NSJSONSerialization 将 NSData 转换为 NSDictionary？

Question

嗨，我在使用 NSData 将 NSDictionary 转换为 NSJSONSerialization 时遇到问题？

我使用我的代码获取数据，但无法将其转换为 json。

这是我的代码...

ViewController.h 文件

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<NSURLConnectionDelegate>
{
    NSString *massage;
    NSURL *url;
    NSMutableURLRequest *request;
    NSURLConnection *connection;
    NSMutableData *httpbody;
    NSMutableData *webData;
    NSData *responceData;
    NSDictionary *responceJson;
}

和 ViewController.m 文件

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    NSString *mobile = @"123456789";

    NSString *password = @"Welcome123";

    NSString *deviceId = @"123sdfg15641ert321ret";


    url = [NSURL URLWithString:@"http://203.109.87.34:8585/d-cab/web/app_dev.php/api/v1"];

    massage = [NSString stringWithFormat:@"{\"action\":\"login\",\"data\":{\"contact\":\"%@\",\"password\":\"%@\",\"deviceId\":\"%@\"}}",mobile,password,deviceId];
    //NSLog(@"Body = %@", massage);
    httpbody = [ NSMutableData dataWithBytes: [ massage UTF8String ] length: [ massage length ] ];
    request = [NSMutableURLRequest requestWithURL: url];
    [request setHTTPMethod: @"POST"];
    [request setHTTPBody: httpbody];
    [request setTimeoutInterval:10.0];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    //NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    //[connection start];
    if (connection) {
        webData = [[NSMutableData alloc]init];
    }

}

#pragma mark NSURLConnection Delegate Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [webData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [webData appendData:data];
    //NSLog(@"WebData = %@",webData);
    //NSLog(@"=================================");
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSError* error = nil;
    responceJson = [NSJSONSerialization JSONObjectWithData:webData options:kNilOptions error:&error];
    NSLog(@"ResponceJSON = %@",responceJson);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    // Show error message
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error In connection" message:@"We are facing some problem in connection. Please Check your Internet Connection." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
    [alert show];
}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

请检查我的代码并告诉我我必须在哪里进行哪些更改？

Answer 1

嘿，感谢所有关注我问题的人......但我在我的问题中发现了问题。
我正在尝试将参数发送为字符串格式而不是字典格式，并且未指定要请求的 header 。这是我更新的代码...

NSDictionary *paramData = [[NSDictionary alloc]initWithObjectsAndKeys:mobile,@"contact",password,@"password",deviceId,@"deviceId", nil];
    //NSLog(@"paramData = %@",paramData);
    jsonParam = [[NSDictionary alloc]initWithObjectsAndKeys:@"login",@"action",paramData,@"data", nil];
    //NSLog(@"jsonParam = %@",jsonParam);

    httpbody = [NSJSONSerialization dataWithJSONObject:jsonParam options:0 error:nil];

    request = [NSMutableURLRequest requestWithURL: url];
    request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", [httpbody length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody: httpbody];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    if (connection) {
        webData = [[NSMutableData alloc]init];
    }  

它对我有用....