我想在地图视图上添加一些注释(大约 500 个),但它似乎显示的最大值是 100。如果我超过 100,则不会调用viewForAnnotation委托方法。但是它非常适合低于 100 的注释。
这是代码:(仅当annotationArray数组的计数小于 101 时才有效)
_allPoints = [[NSMutableArray alloc] init];
NSString* responseFile = [[NSBundle mainBundle] pathForResource:@"Datafile" ofType:@"txt"];
NSData *sampleData = [NSData dataWithContentsOfFile:responseFile];
if (sampleData) {
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:sampleData
options:kNilOptions
error:&error];
NSArray* response = [json objectForKey:@"response"];
for (NSDictionary *lineDict in response) {
if ([[lineDict objectForKey:@"data"] isKindOfClass:[NSArray class]]) {
SinglePoint *singlePoint = [[SinglePoint alloc] initWithDictionary:lineDict];
[_allPoints addObject:singlePoint];
}
else {
NSLog(@"Error");
}
}
}
_mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[_mapView setDelegate:self];
[self.view addSubview:_mapView];
NSMutableArray *annotationArray = [[NSMutableArray alloc] init];
for (int i=0; i<[_allPoints count]; i++) {
SinglePoint *singlePoint = [_allPoints objectAtIndex:i];
NVPolylineAnnotation *annotation = [[NVPolylineAnnotation alloc] initWithPoint:singlePoint mapView:_mapView];
[annotationArray addObject:annotation];
}
[_mapView addAnnotations:(NSArray *)annotationArray];
CLLocationCoordinate2D centerCoord = { 28.632747, 77.219982 };
[_mapView setCenterCoordinate:centerCoord zoomLevel:12 animated:NO];
委托方法是:
编辑:根据评论,开始重用视图但没有运气:(
if ([annotation isKindOfClass:[NVPolylineAnnotation class]]) {
static NSString *viewIdentifier = @"annotationView";
NVPolylineAnnotationView *annotationView = (NVPolylineAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:viewIdentifier];
if (annotationView == nil) {
annotationView = [[NVPolylineAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:viewIdentifier mapView:_mapView];
}
return annotationView;
}
return nil;
我在文档或其他任何地方都找不到任何限制。会不会是内存问题?