如何在目标c中的地图上显示几个位置点 [英] How can I show several location points on map in objective c
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问题描述
for(int x = 0; x <= [ws8.Latitude count]; x ++){
for(int y = 0; y< = [ws8.Longitude count]; y ++){
CLLocationCoordinate2D location1;
location1.latitude = [[ws8.Latitude objectAtIndex:x] floatValue];
location1.longitude = [[ws8.Longitude objectAtIndex:y] floatValue];
region.span = span;
region.center = location1;
if(addAnnotation!= nil){
[mapView removeAnnotation:addAnnotation];
[addAnnotation release];
addAnnotation = nil;
}
addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:location1];
[mapView addAnnotation:addAnnotation];
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
[mapView setShowsUserLocation:YES];
}
}
解决方案
每个纬度,你都是经度绘制的。我删除了内部循环。你可以尝试下面的代码,看看是否适用于你?
for(int x = 0; x <= [ws8。纬度数]; x ++){
CLLocationCoordinate2D location1;
location1.latitude = [[ws8.Latitude objectAtIndex:x] floatValue];
location1.longitude = [[ws8.Longitude objectAtIndex:x] floatValue];
region.span = span;
region.center = location1;
// if(addAnnotation!= nil){
// [mapView removeAnnotation:addAnnotation];
// [addAnnotation release];
// addAnnotation = nil;
//}
addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:location1];
[mapView addAnnotation:addAnnotation];
[addAnnotation release];
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
}
[mapView setShowsUserLocation:YES];
I have two NSMutableArray, first keeps some location's latitudes and second keeps longitudes. Then, I want to see this locations on map with markers. I try like this but it is not work. How can I do this?
for (int x=0; x<=[ws8.Latitude count]; x++) {
for (int y=0; y<=[ws8.Longitude count]; y++) {
CLLocationCoordinate2D location1;
location1.latitude = [[ws8.Latitude objectAtIndex:x] floatValue];
location1.longitude = [[ws8.Longitude objectAtIndex:y] floatValue];
region.span=span;
region.center=location1;
if(addAnnotation != nil) {
[mapView removeAnnotation:addAnnotation];
[addAnnotation release];
addAnnotation = nil;
}
addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:location1];
[mapView addAnnotation:addAnnotation];
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
[mapView setShowsUserLocation:YES];
}
}
解决方案
for each latitude, you are mapping with ever longitude. I removed the inner loop. Can you try below code and see if that works for you?
for (int x=0; x<=[ws8.Latitude count]; x++) {
CLLocationCoordinate2D location1;
location1.latitude = [[ws8.Latitude objectAtIndex:x] floatValue];
location1.longitude = [[ws8.Longitude objectAtIndex:x] floatValue];
region.span=span;
region.center=location1;
// if(addAnnotation != nil) {
// [mapView removeAnnotation:addAnnotation];
// [addAnnotation release];
// addAnnotation = nil;
// }
addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:location1];
[mapView addAnnotation:addAnnotation];
[addAnnotation release];
[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];
}
[mapView setShowsUserLocation:YES];
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