origin=起点经纬度 destination=终点经纬度
然后用请求一下：
(void)getLine{
NSString *url = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=false&mode=walking&language=en",_coor.latitude,_coor.longitude,_lat,_lng];
NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithURL:[NSURL URLWithString:url] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (!data) {
return ;
}
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
if (error) {
return;
}
dispatch_async(dispatch_get_main_queue(), ^{
[self configWithData:json];//json就是得到的数据
});
}];
[task resume];
}
//解析json，拿到步行时间-
(void)configWithData:(NSDictionary *)data{
if (data) {
NSArray *arrRouts=[data objectForKey:@"routes"];GMSPolyline *polyline = nil; if ([arrRouts count] > 0) { NSDictionary *routeDict = [arrRouts objectAtIndex:0]; NSDictionary *routeOverviewPolyline = [routeDict objectForKey:@"overview_polyline"]; NSString *points = [routeOverviewPolyline objectForKey:@"points"]; GMSPath *path = [GMSPath pathFromEncodedPath:points]; polyline = [GMSPolyline polylineWithPath:path]; polyline.strokeWidth = 4.f; polyline.strokeColor = MainColor1; polyline.map = self.googleMapView; GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithPath:path]; GMSCameraUpdate *update = [GMSCameraUpdate fitBounds:bounds]; [self.googleMapView moveCamera:update]; NSArray *routeArr = [data objectForKey:@"routes"]; NSDictionary *routeDic = [NSDictionary dictionaryWithDictionary:[routeArr objectAtIndex:0]]; NSString *time = [NSString stringWithFormat:@"%@",[[[[[routeDic objectForKey:@"legs"] objectAtIndex:0] objectForKey:@"duration"] objectForKey:@"text"] description]];//不行时间 }else{ }}else{
}
}
按照以上步骤就能拿到步行时间，但是你有可能会遇到这个问题
You have exceeded your daily request quota for this API. We recommend registering for a key at the Google Developers Console
意思是说你每日请求这个api的数量已经超了，希望你可以去google后台申请一个key。此时我把谷歌服务的key拼接上如下：
https://maps.googleapis.com/maps/api/directions/json?origin=39.99,116.31&destination=39.99,116.41&sensor=false&mode=walking&key=AIXXDDDDDDD
然后再次请求会报如下错误：
This IP, site or mobile application is not authorized to use this API key. How to fix this issue for an ios app?
原因是我们谷歌服务的key和directions的key不一样的，所以不能乱用，纠结了好久最后在这里找到答案
https://stackoverflow.com/questions/26195282/google-directions-api-failing-to-return-results-in-ios?noredirect=1&lq=1
具体操作是：
进入这个网址http://developers.google.com/maps/documentation/directions
然后点击上边的获取密钥
图片.png
图片.png
然后会有一个key，复制替换上边的key就行了。
如果遇到请求失败，错误是-1002，是因为这个key中有特殊字符，例如--等，把url字符串uft8编码之后再请求，如下：
NSString *urlStr = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%f,%f&sensor=false&mode=walking&language=en&key=AIzaXXXXXlwsvkCHQf--9xIKU0_zyMJ6To ",_coor.latitude,_coor.longitude,_lat,_lng];
NSString *url = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
