Ios 触发UIButton操作时如何传递自定义对象？

我正在用最新的SDK开发一个iOS应用程序

我在以下方法上有一个选择器，需要传递另一个参数：

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    NSLog(@"viewForAnnotation");

    MKAnnotationView *annotationView = nil;

    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

    if ([annotation isKindOfClass:[ShopAnnotation class]])
    {
        // try to dequeue an existing pin view first
        static NSString *ReusableAnnotationIdentifier = @"reusableShopAnnotationIdentifier";

        MKPinAnnotationView *pinView = (MKPinAnnotationView *)[theMapView dequeueReusableAnnotationViewWithIdentifier:ReusableAnnotationIdentifier];

        if (!pinView)
        {
            // if an existing pin view was not available, create one
            MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc]
                                                  initWithAnnotation:annotation reuseIdentifier:ReusableAnnotationIdentifier];

            customPinView.pinColor = MKPinAnnotationColorPurple;
            customPinView.animatesDrop = YES;
            customPinView.canShowCallout = YES;

            // add a detail disclosure button to the callout which will open a new view controller page
            UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
            [rightButton addTarget:self
                            action:@selector(showDetails:)
                  forControlEvents:UIControlEventTouchUpInside];

            customPinView.rightCalloutAccessoryView = rightButton;

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

        annotationView = pinView;
    }

    return annotationView;
}

这就是

showDetails

的实现方式：

- (void) showDetails:(id)sender
{
    NSLog(@"Show Details");
    DetailViewController* mvc = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPhone" bundle:nil];

    mvc.delegate = self;

    [self presentModalViewController:mvc animated:YES];
}

这是

ShopAnnotation

界面：

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

@interface ShopAnnotation : NSObject <MKAnnotation>

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, readonly, strong) NSString *title;
@property (nonatomic, readonly, strong) NSString *subtitle;
@property (nonatomic, readonly, strong) NSManagedObject* shop;

-(id)initWithCoordinate:(CLLocationCoordinate2D) c
                  title:(NSString *) t
               subtitle:(NSString *) st
                   shop:(NSManagedObject*) shop;

@end

那么，这个

（id）发送者是什么？这是一个注释，我可以用来传递此
NSManagedObject
查看如何在“
showDetails:
”方法中传递“
sender
”参数

为什么不将“
UIButton
”子类化（例如，将其命名为“
VansFannelButton
”），并为新对象的“
@接口
”提供一个额外的ivar，它可以作为您的有效负载

然后你可以做：

- (void) showDetails: (VansFannelButton*) sender
{
    if (sender)
    {
         // do something with the managed object payload
         NSManagedObject * mObject = [sender payload];
    }
}

使用
关联对象
进行
传递
更多
参数
到
按钮的
对象

请参阅链接。
您可以尝试添加属性

int ID;

在ShopAnnotation类中，当您填充ShopAnnotation类时，您可以轻松设置自己的唯一ID

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
     if (!pinView)
    {
        // if an existing pin view was not available, create one
        MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc]
                                              initWithAnnotation:annotation reuseIdentifier:ReusableAnnotationIdentifier];

        customPinView.pinColor = MKPinAnnotationColorPurple;
        customPinView.animatesDrop = YES;
        customPinView.canShowCallout = YES;

        // add a detail disclosure button to the callout which will open a new view controller page
        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        [rightButton addTarget:self
                        action:@selector(showDetails:)
              forControlEvents:UIControlEventTouchUpInside];
        //Set tag of the button same as ID
        rightButton.tag=((ShopAnnotation*)annotation).ID;

        customPinView.rightCalloutAccessoryView = rightButton;

        return customPinView;
    }
}

我希望这有帮助

谢谢。
你想在showDetails中添加什么类型的论点？@RajanBalana我已经在我的问题中添加了更多细节。这将是一个
NSManagedObject
。有比子类化、标记（请不要）等更简单的方法来做您想要做的事情。最好的方法是使用地图视图方便的内置委托方法CalloutAccessoryControl。请参见以下示例：，。谢谢。
（id）发送者是
商店注释吗。它是导致操作（或者在本例中是方法）触发的对象，它将是子类“
UIButton
”也称“
VansFannelButton
”。使用关联对象进行此操作是一种攻击。当您可以使用子类或按钮的标记轻松地本地化更改时，为什么要污染
UIButton
类？
int ID;

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
     if (!pinView)
    {
        // if an existing pin view was not available, create one
        MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc]
                                              initWithAnnotation:annotation reuseIdentifier:ReusableAnnotationIdentifier];

        customPinView.pinColor = MKPinAnnotationColorPurple;
        customPinView.animatesDrop = YES;
        customPinView.canShowCallout = YES;

        // add a detail disclosure button to the callout which will open a new view controller page
        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        [rightButton addTarget:self
                        action:@selector(showDetails:)
              forControlEvents:UIControlEventTouchUpInside];
        //Set tag of the button same as ID
        rightButton.tag=((ShopAnnotation*)annotation).ID;

        customPinView.rightCalloutAccessoryView = rightButton;

        return customPinView;
    }
}

- (void) showDetails:(id)sender
{
     UIButton *btn=(UIButton*)sender;
     ShopAnnotation *selectedAnnotation=nil;
     for(ShopAnnotation *a in arrAnnotations){
         if(a.ID == btn.tag){
             selectedAnnotation=a; break;
         }
     }

   // Use your ShopAnnotation for you further processing.
 }