我創建瞭如下的方法來一個的CGRect轉換爲MapRect如下如何轉換的CGRect到MapRect
- (MKMapRect)mapRectForRect:(CGRect)rect
{
CLLocationCoordinate2D topleft = [mapView convertPoint:CGPointMake(rect.origin.x, rect.origin.y) toCoordinateFromView:canvasView];
CLLocationCoordinate2D bottomeright = [mapView convertPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect)) toCoordinateFromView:canvasView];
MKMapPoint topleftpoint = MKMapPointForCoordinate(topleft);
MKMapPoint bottomrightpoint = MKMapPointForCoordinate(bottomeright);
return MKMapRectMake(topleftpoint.x, topleftpoint.y, bottomrightpoint.x - topleftpoint.x, bottomrightpoint.y - topleftpoint.y);
}
我做了一個小測試。
UIImageView *imageView = [[UIImageView alloc] initWithImage:[[UIImage imageNamed:@"heart.png"] imageByScalingProportionallyToSize:CGSizeMake(100, 100)]];
imageView.frame = CGRectMake(0, 0, 100, 100);
imageView.center = [mapView convertCoordinate:mapView.centerCoordinate toPointToView:canvasView];
[canvasView addSubview:imageView];
CGRect rect = imageView.frame;
for (int i = 0; i < 5; i ++)
{
NSLog(@"%f, %f, %f, %f", rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
maprect = [self mapRectForRect:rect];
NSLog(@"%f, %f, %f, %f", maprect.origin.x, maprect.origin.y, maprect.size.width, maprect.size.height);
region = MKCoordinateRegionForMapRect(maprect);
rect = [mapView convertRegion:region toRectToView:canvasView];
}
它工作得很好在iOS 5:
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.000000,52428799.999997
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.00000 0,52428799.999997
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.000000,52428799.999997
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.000000,52428799.999997
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.000000,52428799.999997
但是,在iOS 4.3中的結果是有點怪異。
110.000000,180.000000,100.000000,100.000000
78118912.000000,94811514.406252,52428800.000000,52428799.999997
110.000000,174.263596,100.000000,101.746048
78118912.000000,91803986.406252,52428800.000000,53344231.999997
110.000000,166.962997,100.000000,104.330460
78118912.000000,87976370.406253,52428800.000000,54699207.999997
110.000000,157.400009,100.000000,108.272507
78118912.000000,82962610.406253,52428800.000000,56765975.999997
110.000000,144.297470,100.000000,114.581375
78118912.000000,76093106.406254 ,52428800.000000,60073639.999996
https://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKOverlayView_class/Reference/Reference.html' - (MKMapRect)mapRectForRect:(的CGRect)rect' – SAKrisT 2012-02-12 16:46:05
我檢查它。這不是我想要的。我想將其他視圖中的矩形轉換爲mapview。方法http://stackoverflow.com/questions/6775718/how-to-make-the-union-between-two-mkcoordinateregion也無法正常工作。 – newme 2012-02-13 01:46:36
任何人都有同樣的問題? – newme 2012-02-20 11:08:41