MKMapRect zooms too much

Question

I use this code to show all my annotations on my map:

 MKMapRect zoomRect = MKMapRectNull;
        for (id  annotation in mapView.annotat         


        

Answer 1

Ariel's solution wasn't working for me either but n00neimp0rtant's was. I have rewritten it in Swift as a function rectWithMinimumZoom(_ minimumZoom: Double) in an extension of MKMapRect. In return it the adjusted rect (if adjustment is needed). Also I added a extra safety that minimumZoom cannot be divided by 0.

SWIFT

extension MKMapRect {
func rectWithMinimumZoom(_ minimumZoom: Double = 750) -> MKMapRect{
    var needChange = false

    var x = MKMapRectGetMinX(self)
    var y = MKMapRectGetMinY(self)
    var w = MKMapRectGetWidth(self)
    var h = MKMapRectGetHeight(self)
    let centerX = MKMapRectGetMidX(self)
    let centerY = MKMapRectGetMidY(self)

    if(h < minimumZoom){
        let factor = minimumZoom / max(h,1)
        h = minimumZoom
        w *= factor;
        x = centerX - w / 2
        y = centerY - h / 2
        needChange = true
    }
    if(w < minimumZoom){
        let factor = minimumZoom / max(w,1)
        w = minimumZoom
        h *= factor
        x = centerX - w / 2
        y = centerY - h / 2
        needChange = true
    }
    if(needChange){
        return MKMapRectMake(x, y, w, h);
    }
    return self
}