我需要在MKMapKit中显示多个annonation视图..我使用此代码..
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
DisplayMap *ann = [[DisplayMap alloc] init];
//NSLog(@"xapp.arrplacename:%d",[xapp.arrplacename count]);
for (i=0;i<=[arrplacename count]-1;i++)
{
MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
//arrplacename contains the address of the locations
NSString *straddress=[arrplacename objectAtIndex:i];
NSString *strregion=@"";
NSString *strs=[straddress stringByAppendingString: strregion];
// lbladdress.text=strs;
// NSString add=strs;
// here you define the url setting your address
NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv",[strs stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]];
NSLog(@"US: %@",urlString);
// then you get the response string here
NSString *locationString = [[[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:urlString]] autorelease];
NSLog(@"loaction strings%@",locationString);
// now you can create an array splitting the response values using the ","
//[listItems addObject:locationString];
listItems = [locationString componentsSeparatedByString:@","];
NSLog(@"A: %@",[xapp.listItems objectAtIndex:2]);
// define latitude and longitude variables
double latitude = 0.0;
double longitude = 0.0;
NSString *strlatitude;
NSString *strlongitude;
strlatitude=[xapp.listItems objectAtIndex:2];
strlongitude=[xapp.listItems objectAtIndex:3];
float stringFloat = [strlatitude floatValue];
float string1Float = [strlongitude floatValue];
// if your array has inside the sctructure you aspect (4 values as described in my previous post) and the first value is like "200" (OK result)
if([xapp.listItems count] >= 4 && [[xapp.listItems objectAtIndex:0] isEqualToString:@"200"])
{
// not sure if you need the accurancy parameter
//accurancy = [[listItems objectAtIndex:1] intValue];
// here you can get your values
// latitude = [[listItems objectAtIndex:2] doubleValue];
//longitude = [[listItems objectAtIndex:3] doubleValue];
latitude = stringFloat;
longitude = string1Float;
}
else {
NSLog(@"Error on map");
}
region.center.latitude = latitude;
region.center.longitude = longitude;
NSLog(@"latitude:%g",region.center.latitude);
// region.center.latitude = 42.7157850;
// region.center.longitude = 27.56470180;
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
ann.title = [xapp.arrplacename objectAtIndex:i];
ann.subtitle = [xapp.arrplacename objectAtIndex:i];
ann.coordinate = region.center;
[mapView addAnnotation:ann];
}
}
我在这段代码中确实遇到了一些问题....所有的coordnates都没有添加到listitems数组中..我只能看到在atlast中添加的对象......
这是我添加的代表，用于在我的地图中显示年代..
- (CLLocationCoordinate2D) geoCodeUsingAddress:(NSString *)address{
NSLog(@"ssssss");
double latitude = 0, longitude = 0;
NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *req = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];
NSString *result = [NSString stringWithContentsOfURL:[NSURL URLWithString:req] encoding:NSUTF8StringEncoding error:NULL];
if (result) {
NSScanner *scanner = [NSScanner scannerWithString:result];
if ([scanner scanUpToString:@"\"lat\":" intoString:nil] && [scanner scanString:@"\"lat\":" intoString:nil]) {
[scanner scanDouble:&latitude];
if ([scanner scanUpToString:@"\"lng\":" intoString:nil] && [scanner scanString:@"\"lng\":" intoString:nil]) {
[scanner scanDouble:&longitude];
}
}
}
CLLocationCoordinate2D center;
center.latitude = latitude;
center.longitude = longitude;
return center;
}
-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>)annotation {
MKPinAnnotationView *pinView = nil;
NSLog(@"pinnview before release %d",[pinView retainCount]);
if (pinView !=nil) {
pinView =nil;
[pinView release];
}
NSLog(@"pinnview after release %d",[pinView retainCount]);
// if it's the user location, just return nil.
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
if(annotation != mapView.userLocation)
{
static NSString *defaultPinID = @"your-pin";
pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( counting < [mapView.annotations count])
{
counting++;
pinView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];
/* for(DisplayMap* a in mapView.annotations)
{
if (annotation == a){
pinView.image =
[UIImage imageWithContentsOfFile:
[[NSBundle mainBundle] pathForResource:a.image ofType:nil]];
}
}*/
pinView.centerOffset= CGPointMake(0,-10);
pinView.canShowCallout = YES;
}
}
// return pinView;
}
- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
NSLog(@"enter");
[mapView selectAnnotation:[[mapView annotations] lastObject] animated:YES];
}
虽然我在 for 循环中使用[mapView addAnnotation:ann];，但代表只被调用一次...而且它只显示了针对数组中添加的最后一项tatz的引脚...我可以克服这个????
答案 0 :(得分：0)
你在for循环开始之前只分配和初始化'ann'一次，并且你正在改变它并一次又一次地将它添加到Map中。这就是为什么你只得到一个注释。
将此行移入for循环并尝试，
DisplayMap *ann = [[DisplayMap alloc] init];