Mapkit具有多个注释（callout），映射下一个视图 [英] Mapkit with multi annotation (callout), mapping the next view

问题描述

想要解决我面临的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senario。
当用户执行像披萨这样的搜索时，我在地图上放置了多个注释。
添加了右侧注释视图的按钮，单击该按钮可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添加索引，现在我想从注释中访问此信息，并通过按钮上的选择器将其传递给下一个视图。 / p>

我已经检查了所有mapkit，但找不到我可以用下一个视图和注释映射此信息的地址。

希望我没有在我的问题中困惑你们。请让我知道我会重新构建它。

提前预售。

解决方案

为注释创建 UIButton 时，请设置标记属性（标记为 NSInteger UIView 的属性）到标识相关对象的id或数组索引。然后，您可以从 sender 参数中将该标记值检索到选择器。

---

编辑：这是一些示例代码。

您可以创建注释视图并将该按钮关联到代理的-mapView：viewForAnnotation：方法：

   - （MKAnnotationView *）mapView：（MKMapView *）mapView viewForAnnotation：（id< MKAnnotation>）注释{
 // Boilerplate pin注释码
 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; 
 
 //现在我们将添加正确的标注按钮
 UIButton * detailButton = [UIButton buttonWithType：UIButtonTypeDetailDisclosure]; 
 
 //自定义此行以适合您的代码结构。基本上
 //你只需要找到一个与你的对象在某种程度上匹配的整数值：
 //它在你的MKAnnotation项数组中的索引，或某种类型的id等等
 // 
 //这里我假设你有一个注释数组，它是当前
 //类的一个属性，我们只想存储这个注释的索引。 
 NSInteger annotationValue = [self.annotations indexOfObject：annotation]; 
 
 //将按钮的tag属性设置为索引
 detailButton.tag = annotationValue; 
 
 //告诉按钮触摸时该怎么做
 [detailButton addTarget：self action：@selector（showDetailView :) forControlEvents：UIControlEventTouchUpInside]; 
 
 pin.rightCalloutAccessoryView = detailButton; 
返回引脚; 
  

}

然后在你的行动方法中，你将从标签中解压缩价值并使用它来显示正确的细节：

   - （IBAction）showDetailView：（UIView *）sender {
 //从发件人获取标签值
 NSInteger selectedIndex = sender.tag; 
 MyAnnotationObject * selectedObject = [self.annotations objectAtIndex：selectedIndex]; 
 
 //现在您知道要显示哪个详细视图; 
 //之后的代码取决于你的应用程序的结构，但可能看起来像：
 MyDetailViewController * detailView = [[MyDetailViewController alloc] initWithNibName ...]; 
 detailView.detailObject = selectedObject; 
 
 [[self navigationController] pushViewController：detailView animated：YES]; 
 [detailView release]; 
} 
  

Wanted some help with a problem with mapkit I am facing. Should be a silly problem or I have missed out something while going through the mapkit framework.

Here is the senario. I am placing multiple annotation on the map when the user performs some search like pizza. Added button for the right annotation view, on click which opens a next detail view. The problem is how to send some information to the next view, for example I add index to annotations while creating them, now I want to access this information from annotation, and pass it to the next view via the selector set on the button.

I have checked all the mapkit delicate, but don't find a one where I can map this information with the next view and annotation.

Hope I have not confused you guys in my question. Please let me know I will reframe it.

Thaking in advance.

解决方案

When you create the UIButton for the annotation, set the tag property (tag is an NSInteger property of UIView) to an id or array index that identifies the relevant object. You can then retrieve that tag value from the sender parameter to your selector.

---

Edit: here's some sample code.

You create your annotation view and associate the button in your delegate's -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;

}

Then in your action method, you'll unpack the value from tag and use it to display the right detail:

-(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];
}

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