在“ prepareForSegue”中時，如何訪問當前注釋的NSString？

Question

Pin .h

#import <Foundation/Foundation.h>
@import MapKit;

@interface Pin : NSObject <MKAnnotation> {

NSString *time;
CLLocationCoordinate2D coordinate;
}

@property (nonatomic, copy)   NSString *time;
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;

@end

Pin.m

#import "Pin.h"

@implementation Pin

@synthesize coordinate;
@synthesize time;
@end

我如何在視圖中設置Pin

Pin *newPin = [[Pin alloc]init];
            newPin.coordinate = userCoordinate;

    NSDate *currentTime = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MM-DD-yyy hh:mm a"];
    NSString *resultString = [dateFormatter stringFromDate: currentTime];
    newPin.time = resultString;
    [self.mapView addAnnotation:newPin];

當我按標注時會發生什么

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    [self performSegueWithIdentifier:@"Details" sender:view];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
      if ([segue.identifier isEqualToString:@"Details"])
     {
        InfoViewController *vc = segue.destinationViewController;
     }
}

現在，在使用標識符“ Details”訪問的第二個視圖控制器中，我有一個NSString，它將保存特定引腳的時間。 如何將當前引腳的時間NSString傳遞給下一個視圖的NSString？

注意：地圖上的不同時間只會設置多個圖釘，並且我嘗試使用情節提要將數據從注釋傳遞到iOS的詳細視圖iOS並嘗試使用

Pin *an = (Pin *)mapView.annotation;

但是它只允許我為mapView注釋使用數組

Pin *an = (Pin *)mapView.annotations;

請幫忙！

Answer 1

您可以通過注釋視圖的annotation屬性訪問注釋，然后將其作為發件人傳遞給performSegueWithIdentifier如下所示

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    [self performSegueWithIdentifier:@"Details" sender:view.annotation];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
      if ([segue.identifier isEqualToString:@"Details"])
     {
        Pin *myPin=(Pin *)sender;
        InfoViewController *vc = segue.destinationViewController;
        vc.time=myPin.time;
     }
}