如何减慢Google Maps for iOS中的相机动画位置？

Question

In the Google Maps app for iOS, when you tap the My Location button, the camera slowly pans to your current location from whatever location you are currently at.

Following the Google's developer documentation I have implemented a similar method like the one shown when a user taps a button:

- (void) animateToCameraPosition:   (GMSCameraPosition *)  cameraPosition;

This is similar to my code:

 GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude: lat
                                                        longitude: long zoom: 17];

[googleMapView animateToCameraPosition:camera];

It works, and the camera pans to whatever location I want based on the coordinates I specified. However, the panning is really fast, instantaneous in fact.

I want the camera to slowly pan from whatever location I'm at to the location specified, as demonstrated in Google Maps.

How can I achieve this? Thanks

Answer 1

Basically, you need to put CATransaction around your code.

[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat: YOUR_SPEED] forKey:kCATransactionAnimationDuration];
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude: lat
                                                    longitude: long zoom: 17];
[googleMapView animateToCameraPosition: camera];
[CATransaction commit];

The [NSNumberWithFloat: YOUR_SPEED] will define the duration of your animation.

Answer 2

for swift 3

CATransaction.begin()
CATransaction.setValue(Int(YOUR_SPEED), forKey: kCATransactionAnimationDuration)
// YOUR CODE IN HERE
CATransaction.commit()