我对ios地图应用有疑问。我没有找到任何好的帮助。我尝试了ios和谷歌地图，但我无法找到两者的帮助。我被困在几点上，所以任何人都可以帮助我这些要点
答案 0 :(得分：2)
我会给你一个起点 - 写一条路线并获得路线
获取路线方法（google directions api）：
- (void)callAPIGetDirection:(NSString *)mode
{
// Start new request
CLLocationCoordinate2D currentLocation = [(RCAppDelegate *)[[UIApplication sharedApplication] delegate]getCurrentLocation];
// NSString *urlString = [NSString stringWithFormat:kAPIGetDirection, currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude];
//urlString = @"http://bizannouncements.com/Vega/services/app/getDirections.php?origlat=43.653310&origlong=-79.38277000000001&destlat=43.66361000000001&destlong=-79.35547000000001";
NSString *urlString = @"";
if(![mode isEqualToString:@"transit"])
{
urlString =[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true&mode=%@", currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude, mode];
}
else
{
urlString =[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=true&mode=%@&departure_time=%ld", currentLocation.latitude, currentLocation.longitude, self.location.latitude, self.location.longitude, mode, (long)[[NSDate date] timeIntervalSince1970] + 1800];
}
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSDictionary *rO = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:nil];
NSLog(@"%@", rO);
if(![[rO objectForKey:@"status"] isEqualToString:@"INVALID_REQUEST"] && ![[rO objectForKey:@"status"] isEqualToString:@"ZERO_RESULTS"])
{
//OVER_QUERY_LIMIT
if(![[rO objectForKey:@"status"] isEqualToString:@"OVER_QUERY_LIMIT"])
{
NSArray *routes = [rO objectForKey:@"routes"];
NSArray *legs = [routes[0] objectForKey:@"legs"];
//NSLog(@"legs %@", legs[0]);
NSArray *steps = [legs[0] objectForKey:@"steps"];
//NSLog(@"steps : %@", steps);
Place* office = [[Place alloc] init];
office.name = self.location.name;
office.description = @"";
office.latitude = [[[legs[0] objectForKey:@"end_location"] objectForKey:@"lat"] doubleValue];
office.longitude = [[[legs[0] objectForKey:@"end_location"] objectForKey:@"lng"] doubleValue];
//NSLog(@"office: %f", office.latitude);
NSMutableArray *routing = [[NSMutableArray alloc] init];
[_instructions removeAllObjects];
int ii = 1;
for(NSDictionary *step in steps)
{
[_instructions addObject:[NSString stringWithFormat:@"%i: %@", ii, [step objectForKey:@"html_instructions"]]];
NSDictionary *suStep = [step objectForKey:@"end_location"];
CLLocation *loc = [[CLLocation alloc] initWithLatitude:[[suStep objectForKey:@"lat"] doubleValue] longitude:[[suStep objectForKey:@"lng"] doubleValue]];
[routing addObject:loc];
ii++;
}
[_table reloadData];
//self.mainMap.routes = routing;
//[self.mainMap showRouteTo:office];
}
else
{
[RCCommonUtils showMessageWithTitle:@"Error" andContent:@"Directions service is down. Please try again a bit later!"];
}
}
else
{
[RCCommonUtils showMessageWithTitle:@"Error" andContent:@"There are no directions available!"];
}
[MBProgressHUD hideHUDForView:self.view animated:YES];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[RCCommonUtils showMessageWithTitle:@"Error" andContent:@"Network error. Please try again later!"];
[MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}];
[operation start];
}
在地图上绘制路径：
- (id) initWithFrame:(CGRect) frame
{
self = [super initWithFrame:frame];
if (self != nil) {
mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
mapView.showsUserLocation = YES;
[mapView setDelegate:self];
[self addSubview:mapView];
routeView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, mapView.frame.size.width, mapView.frame.size.height)];
routeView.userInteractionEnabled = NO;
[mapView addSubview:routeView];
self.lineColor = [UIColor colorWithWhite:0.2 alpha:1.0];
}
return self;
}
-(void) centerMap {
MKCoordinateRegion region;
CLLocationDegrees maxLat = -90;
CLLocationDegrees maxLon = -180;
CLLocationDegrees minLat = 90;
CLLocationDegrees minLon = 180;
for(int idx = 0; idx < self.routes.count; idx++)
{
CLLocation* currentLocation = [self.routes objectAtIndex:idx];
if(currentLocation.coordinate.latitude > maxLat)
maxLat = currentLocation.coordinate.latitude;
if(currentLocation.coordinate.latitude < minLat)
minLat = currentLocation.coordinate.latitude;
if(currentLocation.coordinate.longitude > maxLon)
maxLon = currentLocation.coordinate.longitude;
if(currentLocation.coordinate.longitude < minLon)
minLon = currentLocation.coordinate.longitude;
}
region.center.latitude = (maxLat + minLat) / 2;
region.center.longitude = (maxLon + minLon) / 2;
region.span.latitudeDelta = maxLat - minLat;
region.span.longitudeDelta = maxLon - minLon;
[mapView setRegion:region animated:YES];
}
-(void) showRouteTo:(Place*)t {
if(self.routes) {
[mapView removeAnnotations:[mapView annotations]];
}
PlaceMark* to = [[PlaceMark alloc] initWithPlace:t];
[mapView addAnnotation:to];
[self updateRouteView];
[self centerMap];
}
-(void) updateRouteView {
CGContextRef context = CGBitmapContextCreate(nil,
routeView.frame.size.width,
routeView.frame.size.height,
8,
4 * routeView.frame.size.width,
CGColorSpaceCreateDeviceRGB(),
kCGImageAlphaPremultipliedLast);
CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
CGContextSetLineWidth(context, 4.0);
for(int i = 0; i < self.routes.count; i++) {
CLLocation* location = [self.routes objectAtIndex:i];
CGPoint point = [mapView convertCoordinate:location.coordinate toPointToView:routeView];
if(i == 0) {
CGContextMoveToPoint(context, point.x, routeView.frame.size.height - point.y);
} else {
CGContextAddLineToPoint(context, point.x, routeView.frame.size.height - point.y);
}
}
CGContextStrokePath(context);
CGImageRef image = CGBitmapContextCreateImage(context);
UIImage* img = [UIImage imageWithCGImage:image];
routeView.image = img;
CGContextRelease(context);
}
答案 1 :(得分：0)
按地址获取坐标
- (CLLocationCoordinate2D) geoCodeUsingAddress: (NSString *) address
{
CLLocationCoordinate2D myLocation;
// — modified from the stackoverflow page – we use the SBJson parser instead of the string scanner –
NSString *esc_addr = [address stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSString *req = [NSString stringWithFormat: @"http://maps.google.com/maps/api/geocode/json?sensor=false&address=%@", esc_addr];
NSDictionary *googleResponse = [[NSString stringWithContentsOfURL: [NSURL URLWithString: req] encoding: NSUTF8StringEncoding error: NULL] JSONValue];
NSDictionary *resultsDict = [googleResponse valueForKey: @"results"]; // get the results dictionary
NSDictionary *geometryDict = [ resultsDict valueForKey: @"geometry"]; // geometry dictionary within the results dictionary
NSDictionary *locationDict = [ geometryDict valueForKey: @"location"]; // location dictionary within the geometry dictionary
// nslo (@”– returning latitude & longitude from google –”);
NSArray *latArray = [locationDict valueForKey: @"lat"]; NSString *latString = [latArray lastObject]; // (one element) array entries provided by the json parser
NSArray *lngArray = [locationDict valueForKey: @"lng"]; NSString *lngString = [lngArray lastObject]; // (one element) array entries provided by the json parser
myLocation.latitude = [latString doubleValue]; // the json parser uses NSArrays which don’t support “doubleValue”
myLocation.longitude = [lngString doubleValue];
return myLocation;
}