在“prepareForSegue"中如何访问当前注释的 NSString? [英] How do I access the current annotation's NSString when in "prepareForSegue"?

问题描述

引脚 .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

我如何在视图中设置我的 Pin 图

How I set my Pin in the view

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];

按下标注时会发生什么

- (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;
     }
}

现在在使用标识符Details"访问的第二个视图控制器中，我有一个 NSString 将保存特定引脚的时间.如何将当前 pin 的时间 NSString 传递给下一个视图的 NSString?

Now in the second view controller that is accessed with the identifier "Details", I have a NSString that will hold the time of the specific pin. How can I pass the current pin's time NSString to the next view's NSString?

注意:在地图上的不同时间只会设置多个图钉，我尝试过 使用storyboard将数据从注释传递到详细视图iOS并尝试使用

Note: There will but multiple pins set at different times on the map and I have tried Passing data from annotations to detail view iOS using storyboard and tried to use

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

但它只允许我使用一个数组作为 mapView 注释

but it only lets me used an array for the mapView annotation

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

请帮忙！

推荐答案

您可以通过注解视图的 annotation 属性访问您的注解，然后将其作为发送者传递给 performSegueWithIdentifier 像这样

You can access your annotation via the annotation property of the annotation view and then pass this as the sender to performSegueWithIdentifier like so

- (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;
     }
}

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