Setting the camera in viewDidLoad does not take effect

[friedbunny]

Instantiating a map view in viewDidLoad and then trying to set a new camera on that map view no longer works in v3.1.0. Moving the camera setting code to viewDidAppear is enough of a delay to make it work.

MapKit allows viewDidLoad camera manipulation.

The pre-v3.1.0 camera animation example which no longer works:

#import "ViewController.h"
#import <Mapbox/Mapbox.h>

@interface ViewController ()

@property (nonatomic) MGLMapView *mapView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
    self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    CLLocationCoordinate2D center = CLLocationCoordinate2DMake(50.999, 3.3253);

    // Optionally set a starting point, rotated 180°
    [self.mapView setCenterCoordinate:center zoomLevel:5 direction:180 animated:NO];

    [self.view addSubview:self.mapView];

    // Create a camera that rotates around the same center point, back to 0°
    // `fromDistance:` is meters above mean sea level that an eye would have to be in order to see what the map view is showing
    MGLMapCamera *camera = [MGLMapCamera cameraLookingAtCenterCoordinate:center fromDistance:9000 pitch:45 heading:0];

    // Animate the camera movement over 5 seconds
    [self.mapView setCamera:camera withDuration:5 animationTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
}

@end

/cc @1ec5

[1ec5]

I suspect this is a result of #3362. The conversion between altitude and zoom level relies on a vertical field of view that’s measured relative to the view’s height. I suspect the map view and its superview haven’t reached their full height inside of -viewDidLoad.

[stale]

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