AMapPolygonController.m
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//
// AMapPolygonController.m
// amap_flutter_map
//
// Created by lly on 2020/11/12.
//
#import "AMapPolygonController.h"
#import "AMapPolygon.h"
#import "AMapJsonUtils.h"
#import "MAPolygon+Flutter.h"
#import "MAPolygonRenderer+Flutter.h"
#import "FlutterMethodChannel+MethodCallDispatch.h"
@interface AMapPolygonController ()
// 存储所有 polygon 的字典，key 为 polygonId
@property (nonatomic,strong) NSMutableDictionary<NSString*,AMapPolygon*> *polygonDict;
// Flutter 方法通道
@property (nonatomic,strong) FlutterMethodChannel *methodChannel;
// Flutter 插件注册器
@property (nonatomic,strong) NSObject<FlutterPluginRegistrar> *registrar;
// 地图视图
@property (nonatomic,strong) MAMapView *mapView;
@end
@implementation AMapPolygonController
// 构造方法，初始化通道、地图和注册器，并注册 Flutter 侧 polygon 更新的回调
- (instancetype)init:(FlutterMethodChannel*)methodChannel
mapView:(MAMapView*)mapView
registrar:(NSObject<FlutterPluginRegistrar>*)registrar {
self = [super init];
if (self) {
_methodChannel = methodChannel;
_mapView = mapView;
_polygonDict = [NSMutableDictionary dictionaryWithCapacity:1];
_registrar = registrar;
__weak typeof(self) weakSelf = self;
// 注册 Flutter 侧 polygons#update 方法的回调
[_methodChannel addMethodName:@"polygons#update" withHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult _Nonnull result) {
id polygonsToAdd = call.arguments[@"polygonsToAdd"];
if ([polygonsToAdd isKindOfClass:[NSArray class]]) {
[weakSelf addPolygons:polygonsToAdd];
}
id polygonsToChange = call.arguments[@"polygonsToChange"];
if ([polygonsToChange isKindOfClass:[NSArray class]]) {
[weakSelf changePolygons:polygonsToChange];
}
id polygonIdsToRemove = call.arguments[@"polygonIdsToRemove"];
if ([polygonIdsToRemove isKindOfClass:[NSArray class]]) {
[weakSelf removePolygonIds:polygonIdsToRemove];
}
result(nil);
}];
}
return self;
}
// 根据 polygonId 获取 polygon 对象
- (nullable AMapPolygon *)polygonForId:(NSString *)polygonId {
return _polygonDict[polygonId];
}
// 添加一组 polygon 到地图
- (void)addPolygons:(NSArray*)polygonsToAdd {
for (NSDictionary* polygonDict in polygonsToAdd) {
AMapPolygon *polygon = [AMapJsonUtils modelFromDict:polygonDict modelClass:[AMapPolygon class]];
// 先加入到字段中，避免后续的地图回调里，取不到对应的overlay数据
if (polygon.id_) {
_polygonDict[polygon.id_] = polygon;
}
[self.mapView addOverlay:polygon.polygon];
}
}
// 修改一组 polygon 的属性
- (void)changePolygons:(NSArray*)polygonsToChange {
for (NSDictionary* polygonDict in polygonsToChange) {
AMapPolygon *polygon = [AMapJsonUtils modelFromDict:polygonDict modelClass:[AMapPolygon class]];
AMapPolygon *currentPolygon = _polygonDict[polygon.id_];
NSAssert(currentPolygon != nil, @"需要修改的Polygon不存在");
[currentPolygon updatePolygon:polygon];
MAOverlayRenderer *render = [self.mapView rendererForOverlay:currentPolygon.polygon];
if (render && [render isKindOfClass:[MAPolygonRenderer class]]) { // render没有复用，只要添加过，就一定可以获取到
[(MAPolygonRenderer *)render updateRenderWithPolygon:currentPolygon];
}
}
}
// 移除一组 polygon
- (void)removePolygonIds:(NSArray*)polygonIdsToRemove {
for (NSString* polygonId in polygonIdsToRemove) {
if (!polygonId) {
continue;
}
AMapPolygon* polygon = _polygonDict[polygonId];
if (!polygon) {
continue;
}
[self.mapView removeOverlay:polygon.polygon];
[_polygonDict removeObjectForKey:polygonId];
}
}
@end