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我想添加一個簡單的MKPolyline連接兩個MKPinAnnotationViews。我閱讀了本教程,並觀看了蘋果的WWDC 2010視頻。 (http://spitzkoff.com/craig/?p=136)。我只是想畫出簡單的東西,所以在viewDidLoad中,我這樣做:看不到MKPolyline
MKMapPoint *pointArray = malloc(sizeof(CLLocationCoordinate2D) * 2);
pointArray[0] = MKMapPointForCoordinate(CLLocationCoordinate2DMake(32, -115));
pointArray[1] = MKMapPointForCoordinate(CLLocationCoordinate2DMake(32, -130));
MKPolyline *line = [MKPolyline polylineWithPoints:pointArray count:2];
[self.mapView addOverlay:line];
free(pointArray);
然後我委託回調:
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {
if ([overlay isKindOfClass:[MKCircle class]]) {
MKCircleView *view = [[MKCircleView alloc] initWithOverlay:overlay];
view.fillColor = [UIColor redColor];
view.strokeColor = [[UIColor redColor] colorWithAlphaComponent:0.5];
return view;
}
else {
MKPolylineView *view = [[MKPolylineView alloc] initWithOverlay:overlay];
view.fillColor = [UIColor redColor];
view.lineWidth = 20;
return view;
}
}
如果我做一個MKCircle一個簡單的例子,我看到這個圈子。有了這個我在viewDidLoad中添加的MKPolyline,我得到了mapView:viewForOverlay:callback,但沒有任何東西在屏幕上繪製。我錯過了什麼嗎?謝謝。