在MapKit上不工作？

Question

我是iOS编程的新手。我试图在不超过一行的两点之间绘制一条线。这是我到目前为止所尝试的;

ggplot(test_data_long3_raw, aes(Date, value)) + geom_line(aes(colour = variable)) +
  geom_line(data = test_data_long3_mean, aes(group = variable, colour = "mean")) +
  scale_color_manual(values = c("black", "#F8766D","#00BFC4"))

在所有位置创建折线;

@property (nonatomic, strong) MKPolylineView *lineView;
@property (nonatomic, strong) MKPolyline *line;

MapView的：

-(void)allLocationRoute {


CLLocationCoordinate2D coordinates[record.toMoments.count];

int i = 0;
for (MomentEntity *currentEntity in record.toMoments.allObjects) {

    coordinates[i].latitude = [currentEntity.latitude doubleValue];
    coordinates[i].longitude = [currentEntity.longitude doubleValue];
    i++;
}
MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coordinates count:record.toMoments.allObjects.count];
[self.mapView addOverlay:polyline];
line = polyline;

}

但正如你从第一张照片中看到的那样，红线会产生锯齿形。任何帮助表示赞赏。