amap_location/ios/Classes/FlutterAmapView.m

//
//  AmapViewFactory.m
//  amap_location
//
//  Created by i2edu on 2020/4/23.
//

#import "FlutterAmapView.h"
#import "CustomCalloutView.h"
#import "CustomAnnotation.h"
static NSString* viewType = @"com.i2edu.mapView";


@implementation FlutterAmapViewFactory{
    NSObject<FlutterBinaryMessenger>* _messenger;
    FlutterAmapView* amapView;
    
}

- (nonnull NSObject<FlutterPlatformView> *)createWithFrame:(CGRect)frame viewIdentifier:(int64_t)viewId arguments:(id _Nullable)args {
    FlutterAmapView* amapView = [[FlutterAmapView alloc]initWithFrame:frame viewindentifier:viewId arguments:args binaryMessenger:_messenger];
    return amapView;
}
- (NSObject<FlutterMessageCodec> *)createArgsCodec{
    return [FlutterStandardMessageCodec sharedInstance];
}

- (instancetype)initWithMessenger:(NSObject<FlutterBinaryMessenger> *)messenger{
    self = [super init];
    if (self) {
        _messenger=messenger;
    }
    return self;
}
@end

@interface FlutterAmapView()<MAMapViewDelegate>
@property(nonatomic ,strong) MAMapView* mapView;
@property(nonatomic, strong)FlutterMethodChannel* channel;

@end

@implementation FlutterAmapView{
    
}
- (instancetype)initWithFrame:(CGRect)frame viewindentifier:(int64_t)viewId arguments:(id)args binaryMessenger:(NSObject<FlutterBinaryMessenger> *)messenger{
    if(self = [super init]){
        NSString * channelName=[NSString stringWithFormat:@"com.i2edu.mapView/map_view_%lld",viewId];
        _channel = [FlutterMethodChannel methodChannelWithName:channelName binaryMessenger:messenger];
        __weak __typeof__(self) weakSelf = self;
        [weakSelf.channel setMethodCallHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult  _Nonnull result) {
            [weakSelf onMethodCall:call result:result];
        }];
        _mapView = [[MAMapView alloc] initWithFrame:frame];
        _mapView.backgroundColor = [UIColor clearColor];
        _mapView.frame = frame;
        [_mapView setZoomLevel:17.5 animated:YES];
        [_mapView updateUserLocationRepresentation:[self getRepresentation]];
        _mapView.delegate=self;
        
        ///如果您需要进入地图就显示定位小蓝点，则需要下面两行代码
        _mapView.showsUserLocation = YES;
        _mapView.userTrackingMode = MAUserTrackingModeFollow;
    }
    return self;
    
}

-(MAUserLocationRepresentation*)getRepresentation{
    MAUserLocationRepresentation *r = [[MAUserLocationRepresentation alloc] init];
    r.image=[UIImage imageNamed:@"dog"];
      r.image=[self scaleToSize: r.image size:CGSizeMake(50, 60)];
//    r.image=[UIImage imageWithContentsOfFile:@"Assets/Images/dog.png"];
//    r.locationDotFillColor = [UIColor redColor];
    return r;
    
}
- (UIImage *)scaleToSize:(UIImage *)image size:(CGSize)size {
    // 创建一个bitmap的context
    // 并把它设置成为当前正在使用的context
    // Determine whether the screen is retina
    /*
    if([[UIScreen mainScreen] scale] == 2.0) {
        UIGraphicsBeginImageContextWithOptions(size, NO, 2.0);
    } else {
        UIGraphicsBeginImageContext(size);
    }
     */
    UIGraphicsBeginImageContextWithOptions(size, NO, [[UIScreen mainScreen] scale]);
    // 绘制改变大小的图片
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    // 从当前context中创建一个改变大小后的图片
    UIImage * scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    // 使当前的context出堆栈
    UIGraphicsEndImageContext();
    // 返回新的改变大小后的图片
    return scaledImage;
}


- (UIView *)view{
    return _mapView;
    
}

-(void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
    if ([call.method isEqualToString:@"setMarkers"]) {
        NSArray<NSDictionary*> * markers = [call.arguments objectForKey:@"markers"];
        for (NSDictionary* marker in markers) {
            CustomAnnotation *pointAnnotation = [[CustomAnnotation alloc] init];
            NSNumber* lat = marker[@"lat"];
            NSNumber* lon = marker[@"lon"];
            
            CLLocationDegrees latitude = lat.doubleValue;
            CLLocationDegrees longitude = lon.doubleValue;
            pointAnnotation.coordinate = CLLocationCoordinate2DMake(latitude, longitude);
            pointAnnotation.phoneNumber = marker[@"tel"];
            pointAnnotation.map = marker;
            
            pointAnnotation.title = marker[@"title"];
            pointAnnotation.subtitle = marker[@"content"];
            
            [_mapView addAnnotation:pointAnnotation];
        }
        result(nil);
    }else if([call.method isEqualToString:@"onCreate"]){
        result(nil);
    }else if([call.method isEqualToString:@"onPause"]){
        result(nil);
    }else if([call.method isEqualToString:@"onResume"]){
        result(nil);
    }else if([call.method isEqualToString:@"moveCamera"]){
        NSDictionary  *data = [call.arguments objectForKey:@"data"];
        NSNumber  *x = data[@"x"];
        NSNumber  *y = data[@"y"];
        _mapView.centerCoordinate=CLLocationCoordinate2DMake(x.doubleValue, y.doubleValue);
        
        
        result(nil);
    }else {
        result(FlutterMethodNotImplemented);
    }
}

- (MAAnnotationView *)mapView:(MAMapView *)mapView viewForAnnotation:(id <MAAnnotation>)annotation
{
    
    if ([annotation isKindOfClass:[CustomAnnotation class]])
    {
        static NSString *pointReuseIndentifier = @"pointReuseIndentifier";
        
        CustomAnnotationView* annotationView = (CustomAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:pointReuseIndentifier];
        if (annotationView == nil)
        {
            annotationView = [[CustomAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:pointReuseIndentifier];
        }
        annotationView.channel = self.channel;
        
        annotationView.image = [UIImage imageNamed:@"i2"];
        annotationView.image=[self scaleToSize: annotationView.image size:CGSizeMake(50, 60)];
//        annotationView.pinColor = MAPinAnnotationColorPurple;
        annotationView.canShowCallout= NO;       //设置气泡可以弹出，默认为NO
//        annotationView.animatesDrop = YES;        //设置标注动画显示，默认为NO
//        annotationView.draggable = YES;        //设置标注可以拖动，默认为NO
        return annotationView;
    }
    return nil;
}
@end