我在我的应用程序下面的代码,通过谷歌的地理编码增加了一些注释,以一个MapView:加速谷歌地理编码的addAnnotations?
for (PlaceObject *info in mapLocations) {
NSString * addressOne = info.addressOne;
NSString * name = info.name;
NSString * address = [addressOne stringByAppendingString:@",London"];
NSError * error;
NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString ] encoding:NSASCIIStringEncoding error:&error];
NSArray *listItems = [locationString componentsSeparatedByString:@","];
double latitude = 0.0;
double longitude = 0.0;
if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
latitude = [[listItems objectAtIndex:2] doubleValue];
longitude = [[listItems objectAtIndex:3] doubleValue];
} else {
//Error handling
}
CLLocationCoordinate2D coordinate;
coordinate.latitude = latitude;
coordinate.longitude = longitude;
MyLocation *annotation = [[[MyLocation alloc] initWithName:name address:address coordinate:coordinate] autorelease];
[mapViewLink addAnnotation:annotation];
}
这工作,但它需要很长的时间,以便出现,因为它似乎要等到数组中的所有对象都已循环(大约有80个)。
有没有什么办法让视图加载,然后在创建引脚时添加引脚?