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iphone - 关于Apple的KMLViewer placemarkDescription and annotation subtitle

转载 作者：行者123 更新时间：2023-11-29 13:43:41 25 4
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在我的应用程序中，我使用 Apple 的 KMLViewer 来显示我从 KML 文件中获取的注释。在文件 KMLParser.m 中，有一个实例变量 placemarkDescription 用于转换 Description 标签下的信息从 kml 文件到注释副标题。现在，在我的文件中，每个注释都以这种方式在描述下存储信息:

<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.m 中，我已经将 placemarkDescription 从那个转换成这个:

<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>

我这样做是因为我想将此字符串传递给 webView 并在其中可视化。问题是当 kml 加载时，方法获取描述信息，被调用严重时间。与存储在 kml 中的地标的时间完全相同。因此直接传递字符串无效。如果我选​​择设置事件字幕选项( annotation.subtitle = placemarkDescription 在 KMLParser 中)，也许我生成了用户点击的注释的字幕信息，但我不想显示此信息，因为它显示如下

<table width="280px"><tr><td></td><td></td></tr></table><table width="280px"><tr......

顺便说一句，我不知道如何获取所选注释的字幕信息。到目前为止，我只设法将描述信息存储在一个数组中(在 KMLParser.m 中完成)。但是我应该如何处理该数组？如何知道哪个数组条目对应于用户点击的注释(注释标注气泡已打开)。

所以我不知道该怎么办。也许我还不太清楚:我想做的是获取地标(注释)的描述信息，当用户点击 map 中的注释时，点击 disclosureButton 应该将他重定向到显示描述信息的 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 的变化

//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 = @"&lt;";
    NSString *greaterThan = @"&gt;";

    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;
}
}

在这行代码中发现错误(没有崩溃原因描述):

-(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__);
}

最佳答案

不清楚您使用了多少 KMLViewer 示例应用程序代码，但一种方法是创建您自己的注释类而不是使用 MKPointAnnotation类就像示例应用程序一样。

自定义类(例如“PlacemarkAnnotation”)应该实现MKAnnotation协议(protocol)或成为 MKShape 的子类(如果您使用的是 KMLViewer 代码)。在自定义类中，添加一个 placemarkDescription属性(property)。

KMLViewer 代码当前创建 MKPointAnnotation 的位置对象，创建一个 PlacemarkAnnotation而是设置它的 placemarkDescription属性而不是 subtitle属性(property)。

然后在viewForAnnotation委托(delegate)方法，设置rightCalloutAccessoryView到详细信息披露按钮。

接下来，向项目中添加一个带有 UIWebView 的细节 View Controller 在里面。添加 placemarkDescription View Controller 的属性。在viewDidLoad方法，调用 loadHTMLString在网络上查看并传递它placemarkDescription (我认为您可以将 nil 传递给 baseURL )。

在 map View 中的 calloutAccessoryControlTapped委托(delegate)方法，创建细节 View Controller ，设置它的placemarkDescription属性并呈现它:

-(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 子类化为您的自定义类而不是实现 MKAnnotation协议(protocol)。 KMLViewer 代码的其余部分基于此假设。所以改变@interface PlacemarkAnnotation2 : NSObject <MKAnnotation>至 @interface PlacemarkAnnotation2 : MKShape . (顺便说一句，对于 NSString 属性，copy 比 retain 更合适，它会消除警告。)

看起来您可能已经更改了 mkShape 的类型ivar 在 KMLPlacemark (和其他地方)来自 MKShape到别的东西。将这些类型改回 MKShape .

接下来，_createShape可能不是设置 placemarkDescription 的最佳位置因为覆盖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入 point方法(也在 KMLPlacemark 中)。请注意，您的更改存在一些与内存相关的潜在问题。这是我的建议:

- (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 = @"&lt;";
            NSString *greaterThan = @"&gt;";

            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;
}

关于iphone - 关于Apple的KMLViewer placemarkDescription and annotation subtitle，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8285153/

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