Mapbox default compassView when repositioned gives weird outcome

问题

I have a situation where I have to reposition the map box compass view to a different location. The compassView is now rotating when I rotate the map taking some other point as its(compassView) axis and gives me a weird outcome. Screenshot is attached, the black mapBox default compass icon is rotating, refer the screenshots. Is this a MapBox sdk bug? if so, are there any work around? And tweaks? I am confused. Expert advices needed. Thanks in advance.

回答1:

Hey I found another method where I will get the same result of the compass in the map box. I've placed a button and then

func mapViewRegionIsChanging(_ mapView: MGLMapView) {
    compassViewUpdate(direction: Double(bearing))

inside compassViewUpdate method

func compassViewUpdate(direction:Double) {

    self.compassButton.transform = CGAffineTransform(rotationAngle: CGFloat(-direction.degreesToRadians))
}

@Sarang here is a work around. Happy coding.

回答2:

A built-in approach that's available in the Mapbox iOS SDK. Using these methods to move the compass will avoid the distortion caused by .frame and .center changes.

Generally Changing the CompassView Location

mapView.compassViewPosition = .bottomLeft
mapView.compassViewPosition = .bottomRight
mapView.compassViewPosition = .topLeft
mapView.compassViewPosition = .topRight

Use compassViewPosition to get the compass generally where you want it on the screen.

Fine Tuning the CompassView Location

mapView.compassViewMargins = CGPoint(x: 64, y: 16)

Default x, y = 8, 8

The margin is to the outside/along the border of the view. So for .bottomLeft the compass view will move 56 right and 8 up versus .topRight where the compass will move 56 left and 8 down.

回答3:

try changing the compassView.center instead of changing its origin or frame. I am guessing it has approximately 40 pixels width x height, and I changed to bottom left using the following:

    let centerCalc = CGRect(x: 5, y: frame.height - 45, width: 40, height: 40)
    compassView.center = CGPoint(x: centerCalc.midX, y: centerCalc.midY)

It should work!

来源：https://stackoverflow.com/questions/49130712/mapbox-default-compassview-when-repositioned-gives-weird-outcome

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ios

swift

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mapbox