Question

我最终成功获得了callOutAccecoryControlTapped-method中点击的注释索引。 :) 我创建了一个名为Annotation（Annnotation * ann）的自定义注释类，我在parse.com上填充了我的数据库中的值。但现在我不知道如何将值传递给我的下一个视图LAOpeningHoursViewController？我在调试时可以看到所有的值，而* ann（se代码）例如：ann.cname =＆＃34; Olles cafe＆＃34;等等。这很好。

我将整个ann-object传递给我的下一个视图。但我不知道如何将ann.cname放到我的自我.myLabel.text＆＃39;上。我给你看了代码：

如果你有善意回答我，请解释得非常好，因为我是初学者。最好的办法是，如果你在编写代码片段时遇到麻烦......;）

这是第一个视图的一些代码：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
if (!pinView) {
    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
    pinView.pinColor = MKPinAnnotationColorRed;
    pinView.animatesDrop = YES;
    pinView.canShowCallout = YES;

    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    pinView.rightCalloutAccessoryView = rightButton;

} else {
    pinView.annotation = annotation;
}
return pinView;
}


- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view  calloutAccessoryControlTapped:(UIControl *)control {

    Annotation *ann = [[mapView selectedAnnotations] objectAtIndex:0];

    NSLog(@"ann.subtitle = %@", ann.subtitle);
    NSLog(@"ann.cid = %@", ann.cid);
    NSLog(@"ann.cstr = %@", ann.cstr);
    NSLog(@"ann.cname = %@", ann.cname);
    //this works fine, I get all the values

    [self performSegueWithIdentifier: @"openingHours" sender:ann];


}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"openingHours"]) {

    LAOpeningHoursViewController *secondView =     (LAOpeningHoursViewController*)segue.destinationViewController;
    //PFObject *tempObject = [[myMapView selectedAnnotations] objectAtIndex:0];
    Annotation *ann = (id)sender;

    //Here is the problem: What to pass? I want to pass for example ann.cname that is    declared in my custom annotation
    //Both 'ann' and 'tempObject' has the right values for cname but I dont know how to pass it to the next view
    secondView.myLabel.text = self.stringToPass;
   //secondView.myLabel.text = ann.cname;
       }
    }

以下是第二个视图中名为LAOpeningHoursViewController的代码，它应该接收数据：

- (void)viewDidLoad
{
[super viewDidLoad];


        self.myLabel.text = ann.cname;
        //recieving an error-code… of course 

}

在LAOpeningHoursViewController.h中声明为

 @property (strong, nonatomic) IBOutlet UILabel *myLabel;
 @property (strong, nonatomic) NSString *textContent;

最后，这是我的Annotation.h文件，其中cname是应该转到＆＃39; myLabel＆＃39;

的文件

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

@interface Annotation : NSObject <MKAnnotation>
@property(nonatomic, assign) CLLocationCoordinate2D coordinate;
@property(nonatomic, copy)NSString *title;
@property(nonatomic, copy)NSString *subtitle;
@property(nonatomic, copy)UIButton *rightButton;

@property(nonatomic, retain)NSString *cid;
@property(nonatomic, retain)NSString *cname;
@property(nonatomic, retain)NSString *ctel;
@property(nonatomic, retain)NSString *cstr;
@property(nonatomic, retain)NSString *cmon;
@property(nonatomic, retain)NSString *ctue;
@property(nonatomic, retain)NSString *cwed;
@property(nonatomic, retain)NSString *passedId;
@property(nonatomic, retain)NSString *objectId;


@end

Answer 1

sender中的[self performSegueWithIdentifier: @"openingHours" sender:ann];参数应设置为self。这旨在将呈现的视图控制器引用给呈现控制器。

将属性@property (nonatomic, strong) Annotation *selectedAnnotation添加到呈现视图控制器。因此可以这样设置：

//this works fine, I get all the values

[self setSelectedAnnotation:ann];
[self performSegueWithIdentifier: @"openingHours" sender:ann];

现在您将选定的注释作为属性，可用于初始化LAOpeningHoursViewController：

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"openingHours"]) {

    LAOpeningHoursViewController *secondView =     (LAOpeningHoursViewController*)segue.destinationViewController;
    //PFObject *tempObject = [[myMapView selectedAnnotations] objectAtIndex:0];
    Annotation *ann = (id)sender;

    // Setup second view here:
    secondView.myLabel.text = self.selectedAnnotation.cname;
    // assign further properties here...
    }
}

我希望这有帮助，祝你好运！

Xcode：在两个视图之间传递对象？

1 个答案: