Mapkit 具有多注释（callout），映射下一个视图

Question

需要一些帮助来解决我面临的 Mapkit 问题。应该是一个愚蠢的问题，或者我在浏览 Mapkit 框架时错过了一些东西。

这是参议员。 当用户执行某些搜索（如披萨）时，我会在地图上放置多个注释。 添加了右侧注释视图的按钮，单击后将打开下一个详细视图。问题是如何将一些信息发送到下一个视图，例如我在创建注释时向注释添加索引，现在我想从注释访问此信息，并通过按钮上设置的选择器将其传递到下一个视图。

我已经检查了所有精细的地图套件，但没有找到可以将这些信息与下一个视图和注释进行映射的地图套件。

希望我的问题没有让你们感到困惑。请让我知道我会重新设计它。

提前打招呼。

Answer 1

当您为注释创建 UIButton 时，请设置 tag 属性（标记是 UIView 的 NSInteger 属性）到标识相关对象的 id 或数组索引。然后，您可以将该标记值从 sender 参数检索到选择器。

---

编辑：这是一些示例代码。

您创建注释视图并将按钮关联到委托的 -mapView:viewForAnnotation: method:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    // Boilerplate pin annotation code
    MKPinAnnotationView *pin = (MKPinAnnotationView *) [self.map dequeueReusableAnnotationViewWithIdentifier: @"restMap"];
    if (pin == nil) {
        pin = [[[MKPinAnnotationView alloc] initWithAnnotation: annotation reuseIdentifier: @"restMap"] autorelease];
    } else {
        pin.annotation = annotation;
    }
    pin.pinColor = MKPinAnnotationColorRed
    pin.canShowCallout = YES;
    pin.animatesDrop = NO;

    // now we'll add the right callout button
    UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    // customize this line to fit the structure of your code.  basically
    // you just need to find an integer value that matches your object in some way:
    // its index in your array of MKAnnotation items, or an id of some sort, etc
    // 
    // here I'll assume you have an annotation array that is a property of the current
    // class and we just want to store the index of this annotation.
    NSInteger annotationValue = [self.annotations indexOfObject:annotation];

    // set the tag property of the button to the index
    detailButton.tag = annotationValue;

    // tell the button what to do when it gets touched
    [detailButton addTarget:self action:@selector(showDetailView:) forControlEvents:UIControlEventTouchUpInside];

    pin.rightCalloutAccessoryView = detailButton;
    return pin;

}

然后在操作方法中，您将从 tag 中解压值并使用它来显示正确的详细信息：

-(IBAction)showDetailView:(UIView*)sender {
    // get the tag value from the sender
    NSInteger selectedIndex = sender.tag;
    MyAnnotationObject *selectedObject = [self.annotations objectAtIndex:selectedIndex];

    // now you know which detail view you want to show; the code that follows
    // depends on the structure of your app, but probably looks like:
    MyDetailViewController *detailView = [[MyDetailViewController alloc] initWithNibName...];
    detailView.detailObject = selectedObject;

    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}

Answer 2

在注释视图中，是否可以抓取标题或副标题或您在创建图钉时使用的任何其他信息？我想要做的是根据这些变量之一在注释中弹出某个图像。

#import "MapPin.h"

@implementation MapPin


@synthesize coordinate;
@synthesize title;
@synthesize subtitle;
@synthesize indexnumber;
@synthesize imageFile;

-(id)initWithCoordinates:(CLLocationCoordinate2D)location
               placeName: placeName
             description:description
                indexnum:indexnum
            imageFileLoc:imageFileLoc{

    self = [super init];
    if (self != nil) {
        imageFile=imageFileLoc;
        [imageFile retain];
        indexnumber=indexnum;
        [indexnumber retain];
        coordinate = location;
        title = placeName;
        [title retain];
        subtitle = description;
        [subtitle retain];
    }
    return self;

}



-(void)addAnnotations {

    // Normally read the data for these from the file system or a Web service
    CLLocationCoordinate2D coordinate = {35.9077803, -79.0454936};
    MapPin *pin = [[MapPin alloc]initWithCoordinates:coordinate
                                          placeName:@"Keenan Stadium"
                                        description:@"Tar Heel Football"
                                            indexnum:@"1"
                                        imageFileLoc:@"owl.jpg"];
    [self.map addAnnotation:pin];

Answer 3

另一种选择：

您可以实现这些方法：

- (void)mapView:(MKMapView *)mapView didSelectAnnotation:(MKAnnotationView *)view;
- (void)mapView:(MKMapView *)mapView didDeselectAnnotation:(MKAnnotationView *)view;