Question

我想知道如何借助google place API在两个地方之间绘制地图方向。

请提供帮助如何操作。

Answer 1

要创建两个位置的地图方向，首先需要相应的2个纬度和经度，然后需要调用calculateRoutesFrom。在这里你可以将纬度和经度传递给两个地方......

-(NSArray*) calculateRoutesFrom:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t {
    NSString* saddr = [NSString stringWithFormat:@"%f,%f", f.latitude, f.longitude];
    NSString* daddr = [NSString stringWithFormat:@"%f,%f", t.latitude, t.longitude];

    NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.google.com/maps?output=dragdir&saddr=%@&daddr=%@", saddr, daddr];
    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];
    NSLog(@"api url: %@", apiUrl);
    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSStringEncodingConversionAllowLossy error:Nil];
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"points:\\\"([^\\\"]*)\\\"" options:0 error:NULL];
    NSTextCheckingResult *match = [regex firstMatchInString:apiResponse options:0 range:NSMakeRange(0, [apiResponse length])];
    NSString *encodedPoints = [apiResponse substringWithRange:[match rangeAtIndex:1]];
    //NSString* encodedPoints = [apiResponse stringByMatching:@"points:\\\"([^\\\"]*)\\\"" capture:1L];

    return [self decodePolyLine:[encodedPoints mutableCopy]];
}

通过使用-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded，您可以获得给定的两个纬度和经度之间的几个纬度和经度。

-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded {
    [encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\"
                                options:NSLiteralSearch
                                  range:NSMakeRange(0, [encoded length])];
    NSInteger len = [encoded length];
    NSInteger index = 0;
    NSMutableArray *array = [[NSMutableArray alloc] init] ;
    NSInteger lat=0;
    NSInteger lng=0;
    while (index < len) {
        NSInteger b;
        NSInteger shift = 0;
        NSInteger result = 0;
        do {
            b = [encoded characterAtIndex:index++] - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
        lat += dlat;
        shift = 0;
        result = 0;
        do {
            b = [encoded characterAtIndex:index++] - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
        lng += dlng;
        NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5] ;
        NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5] ;

        Place * pp = [[Place alloc] init];
        pp.name = @"place name";
        pp.latitude = [latitude doubleValue];
        pp.longitude = [longitude doubleValue];



        PlaceMark* from = [[PlaceMark alloc] initWithPlace:pp] ;
        [annotations addObject:from];



        printf("[%f,", [latitude doubleValue]);
        printf("%f]", [longitude doubleValue]);
        CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] ;
        [array addObject:loc];
    }

    return array;
}

将从此方法返回纬度和经度数组。

Answer 2

只需4个简单步骤即可添加折线

创建GMSMutablePath对象。
使用addCoordinate：或设置RoutePath中的点 addLatitude：经度：
使用路径作为参数创建新的GMSPolyline对象。
设置GMSPolyline的地图属性。

代码片段如上所述

GMSMutablePath *RoutePath = [GMSMutablePath path];
[RoutePath addCoordinate:CLLocationCoordinate2DMake(-46.85, 129.10)];
[RoutePath addCoordinate:CLLocationCoordinate2DMake(-46.70, 129.30)];

GMSPolyline *polyline = [GMSPolyline polylineWithPath:RoutePath];

polyline.map = YourMapViewObject;

使用Google地图删除和添加Ios中的折线时，Google自己提供了一个良好的文档，其中包含以下链接

how-to-draw-a-map-direction-between-two-places-by-google-place-api

希望有所帮助

如果您在IOS中使用GoogleMap Sdk

如果你想在IOs Map（MKMapView）上绘制折线，那么转到这个示例项目......

https://github.com/kadirpekel/MapWithRoutes

如何通过google place API在两个地方之间绘制地图方向

2 个答案: