Question

我有一个新问题，我不知道为什么......我的进一步解决方案是here由Rob发布。我喜欢他的工作，并且在iOS 6.1更新之前它运行良好。

- (void)loadKml:(NSURL *)url
{
    // parse the kml

    Parser *parser = [[Parser alloc] initWithContentsOfURL:url];
    parser.rowElementName = @"Placemark";
    parser.elementNames = @[@"name", @"Snippet", @"coordinates", @"description"];
    parser.attributeNames = @[@"img src="];
    [parser parse];

    // add annotations for each of the entries

    for (NSDictionary *locationDetails in parser.items)
    {
        MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
        annotation.title = locationDetails[@"name"];
        annotation.subtitle = locationDetails[@"Snippet"];
        NSArray *coordinates = [locationDetails[@"coordinates"] componentsSeparatedByString:@","];
        annotation.coordinate = CLLocationCoordinate2DMake([coordinates[1] floatValue], [coordinates[0] floatValue]);
        [self.mapView addAnnotation:annotation];
    }

    // update the map to focus on the region that encompasses all of your annotations

    MKCoordinateRegion region;
    if ([self.mapView.annotations count] > 1)
    {
        region = [self regionForAnnotations:self.mapView.annotations];
        region = MKCoordinateRegionMake(region.center, MKCoordinateSpanMake(region.span.latitudeDelta * 1.05, region.span.longitudeDelta * 1.05));  // expand the region by 5%
    }
    else
    {
        id<MKAnnotation> annotation = self.mapView.annotations[0];
        region = MKCoordinateRegionMakeWithDistance(annotation.coordinate, 100.0, 100.0); // >>>this line throws: "Thread 1: signal SIGABRT"<<<
    }
    [self.mapView setRegion:region animated:YES];
}

自iOS 6.1 Simulator更新以来，它无法正常工作。

编辑：我收到此错误：

*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'

Answer 1

有几点想法：

您是否检查过以确保IBOutlet mapView与您self.mapView挂钩？如果nil为annotation.coordinate，则应用可能会崩溃。
您是否看过MKUserLocation以确保您获得了有效的结果？也许有if ([self.mapView.annotations count] > 0) { MKCoordinateRegion region; if ([self.mapView.annotations count] > 1) { region = [self regionForAnnotations:self.mapView.annotations]; region = MKCoordinateRegionMake(region.center, MKCoordinateSpanMake(region.span.latitudeDelta * 1.05, region.span.longitudeDelta * 1.05)); // expand the region by 5% } else { id<MKAnnotation> annotation = self.mapView.annotations[0]; region = MKCoordinateRegionMakeWithDistance(annotation.coordinate, 100.0, 100.0); } [self.mapView setRegion:region animated:YES]; }还没有有效值;
我知道我是那个例行公事的人，但我注意到我们没有检查没有位置的情况。你可能想要这样的东西：
```
parser.attributeNames = @[@"img src="];
```
顺便说一句，我注意到你正在使用：
```
parser.attributeNames = @[@"src"];
```
是检索图片网址吗？我原以为这应该只是：
```
attributeDict
```
也许您已对解析器进行了一些更改，但didStartElement的{{1}}永远不会有img src=键入的对象。如果XML标记为<img src="http://blah.blah.blah/0.jpg">，则您要查找的属性名称仅为src。

Answer 2

你检查过你实际上有一个注释要在那时使用吗？也许你的self.mapView.annotations[0]返回了无。

MKCoordinateRegionMakeWithDistance抛出“线程1：信号SIGABRT”

2 个答案: