我正在尝试摆脱一些用于在 MapView 中创建覆盖层的弃用代码,现在我面临以下警告:
不兼容的指针类型从结果类型为"MKOverlayView * _Nonnull"的函数返回"MKCircleRenderer *">
我已经阅读了很多关于这个问题的问答,但直到现在我都无法弄清楚。我的代码有什么问题?
// Create overlay
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay{
MKCircleRenderer *circleView = [[MKCircleRenderer alloc] initWithOverlay:overlay];
circleView.fillColor = [[UIColor cyanColor]colorWithAlphaComponent:0.5];
circleView.strokeColor = [[UIColor blueColor]colorWithAlphaComponent:0.8];
circleView.lineWidth = 1;
return circleView;
}
错误说circleView
是MKCircleRenderer *
的类型,但您的返回类型是MKOverlayView *
。这些类型应相同。
- (MKCircleRenderer *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay{
MKCircleRenderer *circleView = [[MKCircleRenderer alloc] initWithOverlay:overlay];
circleView.fillColor = [[UIColor cyanColor]colorWithAlphaComponent:0.5];
circleView.strokeColor = [[UIColor blueColor]colorWithAlphaComponent:0.8];
circleView.lineWidth = 1;
return circleView;
}