从地图视图(Iphone IOS)在DetailView中获取xml数据 [英] Getting xml data in DetailView from a map view (Iphone IOS)
问题描述
我们正在尝试创建一个具有从xml文件加载的注释的mapview.到目前为止，该方法有效，并且正在使用Apple开发人员库中的KMLViewer代码.现在，我们尝试将数据从XML文件加载到detailview中，但仅加载到相应的条目中.因此，例如，当您单击某个城市的详细信息时，必须从该城市的xml文件中加载详细信息.
We are trying to create a mapview with annotations loaded from a xml file. This works so far, and is making use of the KMLViewer code on the apple developer library. Now we are trying to load the data from the XML file into the detailview but only the corresponding entry. So when you click on details on a city for instance, details must be loaded from the xml file of that city.
我们现在已经尝试了好几天，但只是不知道从哪里开始.现在我们有以下代码:
We are trying for days now but just don't know where to start. We have the following code now:
detailviewcontroller.m
detailviewcontroller.m
#import "DetailViewController.h"
@implementation DetailViewController
@synthesize address;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib
- (void)viewDidLoad
{
TabbedCalculationAppDelegate *appDelegate = (TabbedCalculationAppDelegate *)[[UIApplication sharedApplication] delegate];
address.text = appDelegate.addressInput1 ;
[super viewDidLoad];
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc
{
[super dealloc];
}
地图视图
#import "locator.h"
#import "DetailViewController.h"
@implementation locator
@synthesize map, detailViewController, rightButton, customPinView;
- (void)viewDidLoad
{
[super viewDidLoad];
// create a custom navigation bar button and set it to always says "Back"
UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] init];
temporaryBarButtonItem.title = @"Back";
self.navigationItem.backBarButtonItem = temporaryBarButtonItem;
[temporaryBarButtonItem release];
// Locate the path to the route.kml file in the application's bundle
// and parse it with the KMLParser.
NSString *path = [[NSBundle mainBundle] pathForResource:@"branches" ofType:@"kml"];
kml = [[KMLParser parseKMLAtPath:path] retain];
// Add all of the MKOverlay objects parsed from the KML file to the map.
NSArray *overlays = [kml overlays];
[map addOverlays:overlays];
// Add all of the MKAnnotation objects parsed from the KML file to the map.
NSArray *annotations = [kml points];
[map addAnnotations:annotations];
// Walk the list of overlays and annotations and create a MKMapRect that
// bounds all of them and store it into flyTo.
MKMapRect flyTo = MKMapRectNull;
for (id <MKOverlay> overlay in overlays) {
if (MKMapRectIsNull(flyTo)) {
flyTo = [overlay boundingMapRect];
} else {
flyTo = MKMapRectUnion(flyTo, [overlay boundingMapRect]);
}
}
for (id <MKAnnotation> annotation in annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
if (MKMapRectIsNull(flyTo)) {
flyTo = pointRect;
} else {
flyTo = MKMapRectUnion(flyTo, pointRect);
}
}
// Position the map so that all overlays and annotations are visible on screen.
MKCoordinateRegion mapRegion;
mapRegion.center.latitude = 51.522416;
mapRegion.center.longitude = 5.141602;
mapRegion.span.latitudeDelta = 5;
mapRegion.span.longitudeDelta = 5;
[map setRegion:mapRegion animated:YES];
}
#pragma mark MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
return [kml viewForOverlay:overlay];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
// if it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
// handle custom annotations
// // try to dequeue an existing pin view first
static NSString* BridgeAnnotationIdentifier = @"bridgeAnnotationIdentifier";
MKPinAnnotationView* pinView = (MKPinAnnotationView *)
[map dequeueReusableAnnotationViewWithIdentifier:BridgeAnnotationIdentifier];
if (!pinView)
{
// if an existing pin view was not available, create one
customPinView = [[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:BridgeAnnotationIdentifier] autorelease];
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
//
// note: you can assign a specific call out accessory view, or as MKMapViewDelegate you can implement:
// - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;
//
rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
customPinView.rightCalloutAccessoryView = rightButton;
return customPinView;
}else{
return pinView;}
return nil;
}
#pragma mark -
#pragma mark MKMapViewDelegate
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
{
if (view.annotation == mapView.userLocation)
return;
rightButton = (DetailViewController *)view.annotation;
//show detail view using buttonDetail...
}
// the detail view does not want a toolbar so hide it
[self.navigationController setToolbarHidden:YES animated:YES];
[self.navigationController pushViewController:self.detailViewController animated:YES];
}
- (void)viewDidUnload
{
self.detailViewController = nil;
}
- (void)dealloc
{
[detailViewController release];
[super dealloc];
}
@end
您可以看到，尝试了很多东西之后，代码开始显得凌乱，但是我们真的不知道从哪里开始.
As you can see the code is starting to look messy after trying tons of stuff, but we don't really know where to start.
任何帮助将不胜感激
提前感谢！
推荐答案
请查看KMLParser中KMLPlacemark的接口，您可以在其中看到xml地标元素的确切解析和存储内容.例如，地址丢失.因此，您将必须通过实现KMLPlacemark类中的字段并更改KMLParser方法来添加希望解析器收集的所有信息:
Please have a look at the interface of the KMLPlacemark in KMLParser, there you can see what is exactly parsed and stored of an xml placemark element. For example the address is missing. So you will have to add all the information you want the parser to gather by implementing the fields in the KMLPlacemark class and alter the KMLParser methods:
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName ...
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName ...
以及KMLPlacemark实现的某些部分.要用解析器填充新字段，您必须编写- (void)beginName和- (void)endName之类的方法.当您要解析的元素有子元素时，它将变得有些棘手.
as well as some parts of the KMLPlacemark implementation. To fill the new fields with the parser you'll have to write methods like the - (void)beginName and - (void)endName. It will get a bit tricky when the elements you want to parse have children.
将KMLParser文件拆分为几个包含一个类的文件可能会有所帮助.
It could be helpful to split the KMLParser file into several files which contain one class each.
如果您已实现此目标，并且地标包含所有必需的详细信息，则可以使用MKMapViewDelegate协议在注解上进行点击.实现 didDeselectAnnotationView ，它看起来像这样:
If you have achieved that and your placemark contains all the needed details you can catch the tap on an annotation with the MKMapViewDelegate protocol. Implement didDeselectAnnotationView, which could look like this:
- (void) mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view
{
// implementation example of placemarkForAnnotation below
KMLPlacemark * placemark = [kml placemarkForAnnotation:view.annotation];
MyDetailViewController * myDetailViewController = [[MyDetailViewController alloc] initWithPlacemark:placemark];
[self presentModalViewController:myDetailViewController animated:YES];
[myDetailViewController release];
}
在KMLParser中添加
- (KMLPlacemark *)placemarkForAnnotation:(id <MKAnnotation>)point
{
// Find the KMLPlacemark object that owns this point and return it
for (KMLPlacemark *placemark in _placemarks) {
if ([placemark point] == point)
return placemark;
}
return nil;
}
希望我能指出正确的方向.这将是一些工作;)
Hope I could point you in the right direction. It'll be some work ;)
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