MKCoordinateRegion setRegion 问题

在ios5.0中下面的代码运行正确：

self.mapView = [[[MKMapView alloc]init] autorelease];
mapView.delegate = self;
mapView.frame = CGRectMake(0, 0, 320, 414);
[myView addSubview:mapView];
MKCoordinateRegion zoomRegion = MKCoordinateRegionForMapRect(MKMapRectWorld);
MKCoordinateRegion adjustedRegion = [mapView regionThatFits:zoomRegion];
[mapView setRegion:adjustedRegion animated:NO];

然后我在iphone6.0中运行，就会在[mapView setRegion:adjustedRegion animated:NO];这个地方崩溃。

    *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
 reason: 'Invalid Region <center:+0.00000000, +0.00000000 span:+176.06470039, +360.00004292>'

应该怎么办呢？谢谢。

看起来是[mapView regionThatFits:zoomRegion];引起的问题，删了它 :

MKCoordinateRegion zoomRegion = MKCoordinateRegionForMapRect(MKMapRectWorld);
   // MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:zoomRegion];
    [self.mapView setRegion:zoomRegion animated:NO];