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我有一个必须推入地图的表格视图。我正在尝试从注释中获取标题以显示在地图视图中,并且我需要比较字幕值中的值以完全根据注释值在地图中显示,但我得到的地图是标题和字幕值。我不想显示字幕,但我希望它比较值这是我的代码:

-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>)annotation {
MKAnnotationView *pinView = nil;
if(annotation != mapview.userLocation) 
{
    NSLog(@"%i",k);

    static NSString *defaultPinID = @"defaultPinID";
    pinView = (MKAnnotationView *)[mapview dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
    if ( pinView == nil ) pinView = [[[MKAnnotationView alloc]
                                      initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];



    NSString *st=@"0"; 
 NSString *str = [annotation subtitle];

    if ([str isEqualToString:st]) {
        //pinView.pinColor = MKPinAnnotationColorGreen;
        pinView.image=[UIImage imageNamed:@"greyDot.png"];
        //return pinView;
    }       
    NSString *st1=@"10";

    if ([str isEqualToString:st1]) {
        //pinView.pinColor = MKPinAnnotationColorGreen;
        pinView.image=[UIImage imageNamed:@"blackDot.png"];
        //return pinView;
    }
    NSString *st2=@"20";

    if ([str isEqualToString:st2]) {
        //pinView.pinColor = MKPinAnnotationColorPurple;
        pinView.image=[UIImage imageNamed:@"greendot.png"];
        //return pinView;
    }
    NSString *st3=@"30";

    if ([str isEqualToString:st3]) {
        //pinView.pinColor = MKPinAnnotationColorRed;
        pinView.image=[UIImage imageNamed:@"blueDot.png"];
        //return pinView;
    }


    pinView.canShowCallout = YES;

    infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    //Display *t=annotation;
    infoButton.tag=k;
    [infoButton addTarget:self action:@selector(pinLabelClicked:) forControlEvents:UIControlEventTouchUpInside];
    pinView.rightCalloutAccessoryView = infoButton;

} 

else {
    [mapview.userLocation setTitle:@"I am here"];
}

return pinView;
//k++;

}

这是我生成注释的代码

- (void)generateAnnotations
{
[mapview setMapType:MKMapTypeStandard];
[mapview setZoomEnabled:YES];
[mapview setScrollEnabled:YES];
[mapview setDelegate:self];


for( int i=0;i<[addressArray count];i++ ){
    AddressInfo *address = [addressArray objectAtIndex:i];
    MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } }; 
    region.center.latitude = [address.latitude floatValue];
    region.center.longitude = [address.longitude floatValue];
    region.span.latitudeDelta=10.01f;
    region.span.longitudeDelta=10.01f;
    [mapview setRegion:region animated:YES];
    //[mapview setRegion:region animated:TRUE];
    //[mapview regionThatFits:region];      
    DisplayMap *ann = [[DisplayMap alloc] init];
    //ann.tt=i;
    k=i;
        ann.title = address.name;
    ann.subtitle = [NSString stringWithFormat:@"%@",address.category];

    ann.sa = address.streetaddress;
    ann.sb = address.suburb;
    ann.ph = address.phoneNo;
    ann.index = i;
    //ann.image = [NSString stringWithFormat@"image_%d.png",i];

    ann.coordinate=region.center;

    [mapview addAnnotation:ann];
    [ann release];
}
}

我在这里所做的是我正在根据这个值比较类别值我需要在地图视图中显示带有相对颜色的图钉。任何人都知道如何做到这一点?

4

1 回答 1

1

如上一个问题所述:

如何使注释字幕从标题菜单中消失?

您需要subtitle留空并在注释类中使用单独的自定义属性来存储您的类别。

这样,subtitle标注将不会显示(因为它将为空白),但您仍然可以获取注释的类别来做出决定。


首先,在您的注释类 .h(即 DisplayMap.h)中,添加一个属性category

@property (nonatomic, copy) NSString *category;

接下来,在 Display.m 中,合成属性:

@synthesize category;

接下来,在generateAnnotations您当前设置注释的位置subtitle中,category改为设置并留空subtitle(不要设置)

ann.category = [NSString stringWithFormat:@"%@",address.category];


最后,在 中viewForAnnotation,您可以检查注解的category. 为此,首先检查注解是否属于类型DisplayMap,然后进行强制转换。

所以替换这部分:

NSString *str = [annotation subtitle];
//code that sets pinView.image based on value of str...

有了这个:

pinView.image = set_to_some_default_image;

if ([annotation isKindOfClass:[DisplayMap class]])
{
    DisplayMap *dmAnn = (DisplayMap *)annotation;
    NSString *str = dmAnn.category;

    //code that sets pinView.image based on value of str...
}


一个完全独立的问题是,您似乎正在使用按钮标签和自定义方法来处理标注按钮的按下。在自定义方法中,您可能试图获取被点击的注释的数据。我强烈不建议使用按钮标签或自定义方法。有关更好的选择,请参阅以下内容:

于 2012-08-13T12:58:56.220 回答