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我需要在我的 MkMapView 上显示大约 10 个位置和相应的自定义注释图像(取决于JSON 解析加载的值)。正如前面的答案所建议的那样,我创建了一个自定义注释类来存储一些数据,但是,我再次无法获得正确的顺序:每个地图位置上的自定义图像不尊重各自解析值的正确顺序,而在 UITableView这一切都很完美。这是简化的代码:

对应示例:

if parsed valuesID is 100 ---> annotation image must be 100.png
if parsed valuesID is 200 ---> annotation image must be 200.png
if parsed valuesID is 300 ---> annotation image must be 300.png

viewDidLoad 方法:

- (void)viewDidLoad
{
    [super viewDidLoad];
    map.showsUserLocation = true;
    map.mapType = MKMapTypeStandard;

    #define MakeLocation(lat,lon) [[CLLocation alloc] initWithLatitude:lat longitude:lon]

    locations= @[ MakeLocation(lat1,lon1), MakeLocation(lat2,lon2), MakeLocation(lat3,lon3), MakeLocation(lat4,lon4), MakeLocation(lat5,lon5), MakeLocation(lat6,lon6), MakeLocation(lat7,lon7), MakeLocation(lat8,lon8), MakeLocation(lat9,lon9), MakeLocation(lat10,lon10) ];
}

UIButton 调用的 parseMethod:

   - (IBAction)parseMethod {

        [map removeAnnotations:map.annotations];

        // THE COMPLEX CODE TO PARSE VALUES of valuesID
        ...
        ... // so here I have the full array of valuesID
        ...
        // THE CONTROL FOR THE END OF COMPLETE PARSING (blocks, cycle, ... )

        [self addAnnotations]; // here i'm sure to call method AFTER THE END of complete parsing

    }

MyAnnotation2.h 自定义类:

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MyAnnotation2 : NSObject <MKAnnotation>

@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, assign) int valuesIDMyAnnotation2;

@end

MyAnnotation2.m 自定义类:

#import "MyAnnotation2.h"

@implementation MyAnnotation2

@synthesize coordinate;
@synthesize valuesIDMyAnnotation2;

@end

addAnnotations 方法(在解析完成后调用):

- (void)addAnnotations {

    [table reloadData]; // UITableView with rows populated with locations coordinates and respective valuesID
    [table scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

    for (int l=0; l<[locations count]; l++) {

        annotation2 = [[MyAnnotation2 alloc] init]; // create MyAnnotation2 istance to assign custom properties
        annotation2.valuesIDMyAnnotation2 = [[valuesID objectAtIndex:l] intValue];
        annotation2.coordinate = [locations[l] coordinate];
        [map addAnnotation: annotation2]; // here we call delegate with all necessary data to add annotations, both location coordinate and corresponding valuesID

        NSLog(@"%d - COORDINATES: %f - %f",annotation2.valuesIDMyAnnotation2,annotation2.coordinate.latitude, annotation2.coordinate.longitude);
    }

}

UITableView 委托

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:
                UITableViewCellStyleSubtitle reuseIdentifier:@"Cell"];
    }
            cell.textLabel.text = [NSString stringWithFormat:@"%@",[coordinates objectAtIndex:indexPath.row]]; // here coordinates are values from each location

            if ([[valuesID objectAtIndex:indexPath.row] intValue] == 100) {
                UIImage *image = [UIImage imageNamed:@"100.png"];
                [cell.imageView setImage:image];
            }
            if ([[valuesID objectAtIndex:indexPath.row] intValue] == 200) {
                UIImage *image = [UIImage imageNamed:@"200.png"];
                [cell.imageView setImage:image];
            }
            if ([[valuesID objectAtIndex:indexPath.row] intValue] == 300) {
                UIImage *image = [UIImage imageNamed:@"300.png"];
                [cell.imageView setImage:image];
            }
    return cell
}

最后,viewForAnnotation 委托:

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation {

    if ( ! [annotation isKindOfClass:[MyAnnotation2 class]])
    {
        ((MKUserLocation *)annotation).title = @"My position";
    return nil;
    }

    MKAnnotationView *pinView= [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];

    MyAnnotation2 *myPin = (MyAnnotation2 *)annotation;

    if (myPin.valuesIDMyAnnotation2 == 100) {
        pinView.image = [UIImage imageNamed:@"100.png"];
    }
    if (myPin.valuesIDMyAnnotation2 == 200) {
        pinView.image = [UIImage imageNamed:@"200.png"];
    }
    if (myPin.valuesIDMyAnnotation2 == 300) {
        pinView.image = [UIImage imageNamed:@"300.png"];
    }
    [pinView setFrame:CGRectMake(0, 0, 25, 25)];
    return pinView;

}

编辑 - NSLogs 结果示例(来自 addAnnotations 方法的代码):

100 - COORDINATES lat1 - lon1 // here I expect annotation images100.png on location1
200 - COORDINATES lat2 - lon2 // ...
100 - COORDINATES lat3 - lon3
300 - COORDINATES lat4 - lon4
100 - COORDINATES lat5 - lon5
200 - COORDINATES lat6 - lon6
100 - COORDINATES lat7 - lon7
300 - COORDINATES lat8 - lon8
300 - COORDINATES lat9 - lon1
200 - COORDINATES lat10 - lon10

结果: 在 UITableView 上它非常完美,我可以看到位置坐标和自定义图像之间的正确对应关系,并且 NSLog() 给出了位置和 valuesID 的正确对应关系。相反,在 MKMapView 上,自定义注释图像未按正确顺序添加,因此我有正确的注释图像,但位置错误。请再次帮我解决这个问题,谢谢!

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1 回答 1

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在每一行上放置一个断点pinView.image,当它设置 image200.png 时,检查坐标是什么(你可能需要 NSLog 它们,我从来不擅长深入挖掘调试器数据)。如果您有不匹配的情况,请查看其余代码中可能会更改位置值的任何其他内容,任何内容,然后在此处设置一个断点。如果在 和 之间触发了该断点parseMethodviewForAnnotation那么您可能是罪魁祸首。

于 2013-02-09T03:13:46.280 回答