I'm trying to add overlays to an MKMapView, avoiding duplicates by first looking for the overlay in the maps overlays (mapView.overlays: [MKoverlay]) store.I'm trying to add overlays to an MKMapView, avo
阅读背景：
Swift错误——在执行indexOf时不能将“MKOverlay”类型的值转换为预期参数类型“@noescape (MKOverlay)抛出-> Bool”
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