如何在地图视图中仅显示pin(注释)标题?

时间:2012-08-13 09:49:29

标签: iphone objective-c ios5

我有一个必须推入地图的表格视图。我试图从注释中获取标题以在地图视图中显示,我需要比较字幕值的值以在地图中显示完全基于注释值,但我在地图中得到的是标题和副标题值。 我不想显示副标题,但我希望它能比较这些值  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];
}
}

我在这里做的是我正在比较基于此值的类别值我需要在地图视图中显示相对颜色的图钉。 任何人都知道如何做到这一点?

1 个答案:

答案 0 :(得分:1)

如上一个问题中所述:

how to make the annotation subtitle disappear from title menu?

您需要将subtitle留空,并在注记类中使用单独的自定义属性来存储您的类别。

这样,subtitle将不会显示在标注中(因为它将为空白),但您仍然可以获取注释的类别以进行决策。


首先,在注释类.h(将是DisplayMap.h)中,为category添加一个属性:

@property (nonatomic, copy) NSString *category;

接下来,在Display.m中,合成属性:

@synthesize category;

接下来,在当前设置注释generateAnnotations的{​​{1}}中,设置subtitlecategory留空(不要设置)

subtitle


最后,在ann.category = [NSString stringWithFormat:@"%@",address.category]; 中,您可以检查注释的viewForAnnotation。为此,首先检查注释是否为category类型,然后再进行投射。

所以替换这部分:

DisplayMap

用这个:

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


一个完全独立的问题是看起来你正在使用按钮标签和自定义方法来处理按下标注按钮。在自定义方法中,您可能正在尝试获取已点击的注释的数据。我强烈建议不要使用按钮标签或自定义方法。有关更好的替代方案,请参阅以下内容: