关于苹果的KMLViewer地标说明和注释字幕
在我的应用程序中，我使用Apple的KMLViewer来显示从KML文件获得的注释。在文件KMLParser.m中，有一个实例variablesplacemarkDescription，用于将描述标签下的信息从kml文件转换为注释字幕。现在，我的文件每个注释都有这样存储在Description下的信息：
<table width="280px"><tr><td></td><td></td></tr></table><table width="280px"><tr><td><b>Fitness Bulls</b>---Palester sportive. Sporti dhe koha e lire.....<a href="http://www.site.com/BIZ_DIR/810180432/Article-Fitness-Bulls.aspx" style="color:Green;" >Shikoni detajet >></a></td></tr><tr><td><a href="http://www.site.com/HartaV2/AddReview.aspx?gisDataId=8123855e-b798-40bc-ad2e-00346a931211" style="color:Green;" >Shkruani pershtypjen tuaj >> </a> <p style="float:right;">Postuar nga:<i>Import</i></p></td></tr></table>
在KMLParser.mi中，将placemarkDescription从这个转换为：
<html><body> <table width="280px"><tr><td></td><td></td></tr></table><table width="280px"><tr><td> <b>Fitness Bulls</b>---Palester sportive. Sporti dhe koha e lire..... <a href="http://www.site.com/BIZ_DIR/810180432/Article-Fitness-Bulls.aspx" style="color:Green;" >Shikoni detajet >></a></td></tr><tr><td> <a href="http://www.site.com/HartaV2/AddReview.aspx?gisDataId=8123855e-b798-40bc-ad2e-00346a931211" style="color:Green;" >Shkruani pershtypjen tuaj >> </a> <p style="float:right;">Postuar nga:<i>Import</i></p></td></tr></table> </body></html>
我已经这样做了，因为我想把这个string传递给一个webView，并在其中可视化。 问题是，当加载kml的时候，这些方法会得到描述信息，被称为严重的时间。与kml中存储的地标的时间一样，所以直接传递string没有任何效果。如果我选择设置活动的subtitle选项annotation.subtitle = placemarkDescription KMLParser中的placemarkDescription），也许我会得到用户点击的注释的字幕信息，但我不想显示这个信息，因为它显示像这样
<table width="280px"><tr><td></td><td></td></tr></table><table width="280px"><tr......
顺便说一句，我不知道如何获得选定的注释的字幕信息。 到目前为止，我只pipe理了一个数组中的描述信息（在KMLParser.m中完成）。但是我该怎么处理这个数组呢？如何知道哪个数组条目对应于用户点击的注释（注解宣传泡沫已打开）。
所以我不知道该怎么做。 也许我还没有太清楚：我想要做的是获取地标（注释）的描述信息，当用户点击地图上的注释时，点击揭示button应该将他redirect到显示描述信息的webView。
编辑代码添加：
DetailViewController.h
#import <UIKit/UIKit.h> @interface DetailViewController : UIViewController<UIWebViewDelegate> { UIWebView *webView; UITextField *addressBar; UIActivityIndicatorView *activityIndicator; NSString *placemarkDescription; } @property (nonatomic, retain) IBOutlet UIWebView *webView; @property (nonatomic, retain) IBOutlet UITextField *addressBar; @property (nonatomic, retain) IBOutlet UIActivityIndicatorView *activityIndicator; @property (nonatomic, retain) NSString *placemarkDescription; -(IBAction) gotoAddress:(id)sender; -(IBAction) goBack:(id)sender; -(IBAction) goForward:(id)sender; @end
DetailViewController.m
#import "DetailViewController.h" @implementation DetailViewController @synthesize webView, addressBar, activityIndicator, placemarkDescription; - (void)viewDidLoad { [super viewDidLoad]; [webView loadHTMLString:placemarkDescription baseURL:nil]; } -(IBAction)gotoAddress:(id) sender { NSURL *url = [NSURL URLWithString:[addressBar text]]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [webView loadRequest:requestObj]; [addressBar resignFirstResponder]; } -(IBAction) goBack:(id)sender { [webView goBack]; } -(IBAction) goForward:(id)sender { [webView goForward]; } - (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType { if (navigationType == UIWebViewNavigationTypeLinkClicked) { NSURL *URL = [request URL]; if ([[URL scheme] isEqualToString:@"http"]) { [addressBar setText:[URL absoluteString]]; [self gotoAddress:nil]; } return NO; } return YES; } - (void)webViewDidStartLoad:(UIWebView *)webView { [activityIndicator startAnimating]; } - (void)webViewDidFinishLoad:(UIWebView *)webView { [activityIndicator stopAnimating]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)dealloc { [super dealloc]; } @end
PlacemarkAnnotation2.h
#import <Foundation/Foundation.h> #import <MapKit/Mapkit.h> @interface PlacemarkAnnotation2 : NSObject <MKAnnotation> { CLLocationCoordinate2D coordinate; NSString * title; NSString * subtitle; NSString * placemarkDescription; } @property (nonatomic, assign) CLLocationCoordinate2D coordinate; @property (nonatomic, retain) NSString * title; @property (nonatomic, retain) NSString * subtitle; @property (nonatomic, retain) NSString * placemarkDescription; @end
PlacemarkAnnotation2.m
#import "PlacemarkAnnotation2.h" @implementation PlacemarkAnnotation2 @synthesize coordinate, title, subtitle, placemarkDescription; - (id) initWithCoordinate:(CLLocationCoordinate2D)coord andTitle:(NSString *)maintitle andSubtitle:(NSString *)subTitle { self.coordinate = coord; self.title = maintitle; self.subtitle = subTitle; return self; } -(NSString *) placemarkDescription { return placemarkDescription; } - (void) setPlacemarkDescription: (NSString *) pd { placemarkDescription = pd; } - (void) dealloc { [title dealloc]; [subtitle dealloc]; [placemarkDescription dealloc]; [super dealloc]; } @end
KMLParser.M中的更改
//KMLPoint class - (MKShape *)mapkitShape { PlacemarkAnnotation2 *annotation = [[PlacemarkAnnotation2 alloc] init]; annotation.coordinate = point; return [annotation autorelease]; } //KMLPlacemark class - (void)_createShape { if (!mkShape) { mkShape = [[geometry mapkitShape] retain]; mkShape.title = name; // Skip setting the subtitle for now because they're frequently // too verbose for viewing on in a callout in most kml files. NSString *lessThan = @"<"; NSString *greaterThan = @">"; placemarkDescription = [placemarkDescription stringByReplacingOccurrencesOfString:lessThan withString:@"<"]; placemarkDescription = [placemarkDescription stringByReplacingOccurrencesOfString:greaterThan withString:@">"]; NSString *beforeBody = @"<html><body>"; NSString *afterBody = @"</body></html>"; NSString *finalContent = [[beforeBody stringByAppendingString:placemarkDescription] stringByAppendingString:afterBody]; placemarkDescription = finalContent; mkShape.placemarkDescription = placemarkDescription; } }
在这行代码中find错误（没有崩溃描述的原因）：
-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control { NSLog(@">>> Entering %s <<<", __PRETTY_FUNCTION__); DetailViewController *dvc = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:[NSBundle mainBundle]]; PlacemarkAnnotation2 *pa = (PlacemarkAnnotation2 *)view.annotation; dvc.placemarkDescription = pa.placemarkDescription; [self presentModalViewController:dvc animated:YES]; [dvc release]; NSLog(@"<<< Leaving %s >>>", __PRETTY_FUNCTION__); }
目前尚不清楚您正在使用多lessKMLViewer示例应用程序代码，但实现此目的的一种方法是创build自己的注释类，而不是像示例应用程序那样使用MKPointAnnotation类。
自定义类（例如“ PlacemarkAnnotation ”）应该实现MKAnnotation协议或者是MKAnnotation的子类（如果使用的是KMLViewer代码）。 在自定义类中，添加一个placemarkDescription属性。
在KMLViewer代码当前创build一个MKPointAnnotation对象的地方，改为创build一个PlacemarkAnnotation并设置它的MKPointAnnotation属性而不是subtitle属性。
然后在viewForAnnotation委托方法中，将rightCalloutAccessoryView设置为详细披露button。
接下来，在项目中添加一个UIWebView的详细视图控制器。 将一个placemarkDescription属性添加到视图控制器。 在viewDidLoad方法中，在Web视图上调用loadHTMLString并将其传递给loadHTMLString （我认为你可以通过baseURL ）。
在地图视图的calloutAccessoryControlTapped委托方法中，创build详细视图控制器，设置其calloutAccessoryControlTapped属性并显示它：
-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control { DetailViewController *dvc = [[DetailViewController alloc] init... PlacemarkAnnotation *pa = (PlacemarkAnnotation *)view.annotation; dvc.placemarkDescription = pa.placemarkDescription; [self presentModalViewController:dvc animated:YES]; [dvc release]; }
编辑：
首先，看起来最好将MKShape作为自定义类的子类，而不是实现MKAnnotation协议。 其余的KMLViewer代码是基于这个假设。 因此，将@interface PlacemarkAnnotation2 : NSObject <MKAnnotation>更改为@interface PlacemarkAnnotation2 : MKShape 。 （顺便说一句，对于NSString属性， copy比retain更合适，它将摆脱警告。）
它也看起来像你可能已经在KMLPlacemark （和其他地方）从MKShape更改为其他types的mkShape伊娃。 将这些types更改回MKShape 。
接下来， _createShape可能不是设置_createShape的最佳位置，因为对于叠加和注释都调用了该方法。 从该方法中删除您的更改，并将它们放在point方法中（也在KMLPlacemark ）。 请注意，您的更改存在一些潜在的与内存相关的问题。 这是我的build议：
- (void)_createShape { if (!mkShape) { mkShape = [[geometry mapkitShape] retain]; mkShape.title = name; // Skip setting the subtitle for now because they're frequently // too verbose for viewing on in a callout in most kml files. } } - (id <MKAnnotation>)point { [self _createShape]; if ([mkShape isKindOfClass:[PlacemarkAnnotation2 class]]) { if (placemarkDescription != nil) //check for nil, otherwise will crash when //passing to stringByAppendingString below { NSString *lessThan = @"<"; NSString *greaterThan = @">"; placemarkDescription = [placemarkDescription stringByReplacingOccurrencesOfString:lessThan withString:@"<"]; placemarkDescription = [placemarkDescription stringByReplacingOccurrencesOfString:greaterThan withString:@">"]; NSString *beforeBody = @"<html><body>"; NSString *afterBody = @"</body></html>"; NSString *finalContent = [[beforeBody stringByAppendingString:placemarkDescription] stringByAppendingString:afterBody]; placemarkDescription = [finalContent retain]; //added retain above since finalContent is autoreleased //and we are setting the ivar manually. otherwise, //can result in EXC_BAD_ACCESS later. } PlacemarkAnnotation2 *pa2 = (PlacemarkAnnotation2 *)mkShape; pa2.placemarkDescription = placemarkDescription; return (id <MKAnnotation>)mkShape; } return nil; }