更新MKMapView的適當方法

我使用CLGeocoder來獲取從基於Web的API下載的位置的GPS座標。現在我計算下載的記錄數並在遍歷循環次數後更新MapView。這有效，但似乎應該有一個更優雅/有效的方法來做到這一點。更新MKMapView的適當方法

有關完成此操作的最佳方法的任何想法？

- (void) getCoordinatesForTheseLocations:(NSArray*) meetRecords 
{ 
    NSInteger countOfAnnotations = [meetRecords count]; 

    if (debug==1) NSLog(@"countOfAnnotations equals %ld", (long)countOfAnnotations); 
    NSInteger __block iCount = 0; 
    for (NSDictionary* meet in meetRecords) { 

    { 
     NSString *location = [NSString stringWithFormat:@"%@, %@, %@", 
           [[meet objectForKey:MEET_VENUE] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]], 
           [[meet objectForKey:MEET_CITY] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]], 
           [[meet objectForKey:MEET_STATE_ABBREV] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]]; 

     CLGeocoder *geocoder = [[CLGeocoder alloc] init]; 
     [geocoder geocodeAddressString:location completionHandler:^(NSArray *placemarks, NSError *error) { 
      CLLocationCoordinate2D coordinates; 
      CLPlacemark* bestGuess; 

      if (error) { 
      ….} else if(placemarks && placemarks.count > 0) { 

       NSMutableDictionary* meetInfoForAnnotation = [[NSMutableDictionary alloc] init]; 

       if (debug==2) NSLog(@"meet = %@", meet); 

       meetInfoForAnnotation = [meet mutableCopy]; 

       if (debug==2) NSLog(@"Received placemarks: %@", placemarks); 


       bestGuess = [placemarks objectAtIndex:0]; 
       coordinates.latitude = bestGuess.location.coordinate.latitude; 
       coordinates.longitude = bestGuess.location.coordinate.longitude; 

       [meetInfoForAnnotation setObject:[NSNumber numberWithDouble:coordinates.longitude] forKey:MEET_LONGITUDE]; 
       [meetInfoForAnnotation setObject:[NSNumber numberWithDouble:coordinates.latitude] forKey:MEET_LATITUDE]; 

       [self mapAnnotations:meetInfoForAnnotation]; 

      } 

      if (iCount == countOfAnnotations - 1) { //Update mapView if this is true 
       dispatch_async(dispatch_get_main_queue(), ^{ 

        myPinColor = MKPinAnnotationColorPurple; 

        [self setAnnotations:self.meetAnnotations]; 
       }); 
      } 
      if (debug==1) NSLog(@"iCount = %d and countOfAnnotations = %d",iCount, countOfAnnotations); 
      iCount ++; //Increment counter whether are successful or have an error. 
     }]; 
    } 
}

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2014-02-24 PhillipOReilly

答案結果很簡單。永遠不要試圖重新發明輪子！我最終使用了一個類似於Zip Code Distance API的API。然後，我可以根據郵政編碼過濾地址，並保持在下載限制範圍內。

來源

2014-04-17 15:27:51 PhillipOReilly

更新MKMapView的適當方法

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