Question

我有两个视图控制器（DatePickerViewController和RouteHistoryViewController）。我在DatePickerViewController中也有服务器响应。如何将该响应传递给RouteHitoryViewController。 RouteHistoryViewController有地图视图。

以下是代码DatePicker.m：

#import "DatePickerViewController.h"
#import "MapAnnotation.h"

@interface DatePickerViewController ()


@end

@implementation DatePickerViewController
{
    //#define URL @"http://140e3087.ngrok.com"
#define URL3 @"http://784effb4.ngrok.com/bustracking/json/student/route_history"
    NSString *formatedDate;
    NSString *lat;
    NSString *longi;
    NSString *server_created_date;


}
@synthesize appDelagate,datePicker;

- (void)viewDidLoad {
    [super viewDidLoad];
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    NSLog(@"%@", appDelegate);

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];

    formatedDate = [dateFormatter stringFromDate:self.datePicker.date];


    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (IBAction)sendPicker:(id)sender;
{
    [self sendDataToServer : @"GET"];

   // NSLog(@"%@", formatedDate);

    //self.selectedDate.text =formatedDate;
}

-(void) sendDataToServer : (NSString *) method{


    NSString *beaconiD = @"EC112729B51B";
    NSString *trackerID = @"e61078a67e4233ad";//appDelagate.tracker_id;
    NSString *date = formatedDate;


    NSMutableURLRequest *request = nil;
    NSString *getURL = [NSString stringWithFormat:@"%@?beacon_id=%@&tracker_id=%@&date=%@", URL3, beaconiD, trackerID, date];
    getURL = [getURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url =  [NSURL URLWithString: getURL];
    request = [NSMutableURLRequest requestWithURL:url];

    NSLog(@"link: %@", getURL);

    [request setHTTPMethod:@"GET"];
    [request addValue: @"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    NSLog(@"connection: %@", connection);

    if( connection )
    {
        mutData = [NSMutableData new];
    }
    else
    {
        NSLog (@"NO_CONNECTION");
        return;
    }
}

#pragma mark NSURLConnection delegates

-(void) connection:(NSURLConnection *) connection didReceiveResponse:(NSURLResponse *)response
{
    [mutData setLength:0];
}

-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [mutData appendData:data];
}

-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{

    NSLog (@"NO_CONNECTION");

    return;
}

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

//        NSString *jsonresultString =[jsonresultDict objectForKey:@"result"];
//        NSLog(@"%@", jsonresultString);
//        //serverResponse.text = jsonresultString;

        NSError *error = nil;
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:mutData options:kNilOptions error:&error];
        NSArray *fetchedArr = [json objectForKey:@"result"];


        for (NSDictionary *user in fetchedArr)
        {


            lat = [user objectForKey:@"latitude"];
            longi = [user objectForKey:@"longitude"];
            server_created_date = [user objectForKey:@"server_created_date"];

            NSLog(@"Item date&time : %@", server_created_date);
            NSLog(@"Item longitude : %@", longi);
            NSLog(@"Item latitude : %@", lat);
        }



}

以下是代码RouteHistory.m：

#import "RouteHistoryViewController.h"
#import "MapAnnotation.h"

@interface RouteHistoryViewController ()

@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@end

@implementation RouteHistoryViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.mapView.delegate = self;

    //[self.mapView removeAnnotations:self.mapView.annotations];

    MapAnnotation *mapPoint = [[MapAnnotation alloc] init];
    mapPoint.coordinate = CLLocationCoordinate2DMake([self.appDelagate.latitude doubleValue], [self.appDelagate.longitude doubleValue]);
    mapPoint.title = self.appDelagate.name;
    mapPoint.time = self.appDelagate.server_created_date;
    mapPoint.mapimage = self.appDelagate.image;

    // Add it to the map view
    [self.mapView addAnnotation:mapPoint];

    // Zoom to a region around the pin
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(mapPoint.coordinate, 500, 500);

    [self.mapView setRegion:region];


    //testing
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(receiveTestNotification:)
                                                 name:@"MapUpdate"
                                               object:nil];


    // Do any additional setup after loading the view.
}
#pragma mark - MKMapViewDelegate

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKPinAnnotationView *view = nil;
    static NSString *reuseIdentifier = @"MapAnnotation";

    // Return a MKPinAnnotationView with a simple accessory button

    view = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseIdentifier];
    if(!view)
    {
        view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
        view.canShowCallout = YES;
        view.animatesDrop = YES;
    }

    return view;
}

使用prepareforsegue

路由历史记录的datepicker

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    if ([[segue identifier]isEqualToString:@"b"])
    {
        RouteHistoryViewController *rh = segue.destinationViewController;


        NSLog(@"%@", rh);

    }

}

Answer 1

在此行之后的connectionDidFinishLoading中的第一个视图控制器

    NSArray *fetchedArr = [json objectForKey:@"result"];

添加以下两行

 _responseFromServer = fetchedArr; 
[self performSegueWithIdentifier:@"segueToRouteHistory" sender:self];

然后在第一个View Controller中添加此方法

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

 if ([[segue identifier] isEqualToString:@"segueToRouteHistory"])
 {


     RouteHistoryViewController *routeHistoryController = [segue segueToRouteHistory];

     [routeHistoryController setFetchedArray:_responseFromServer];

  }
}

在First View Controller .h文件中添加此

@property NSArray *responseFromServer;

现在我们已将从服务器接收的Response数组分配给目标视图控制器中的对象。

不要忘记添加

@property NSArray *fetchedArray;

在你的第二个ViewController的.h文件

中

现在您可以在第二个视图控制器中访问此数组。 PS：不要忘记将故事板中的segue从第一个视图控制器提供给第二个视图控制器，并将Segue Identifier命名为“segueToRouteHistory”

将数据传递给另一个视图控制器

1 个答案: