继承位置页面 RCLocationPickerViewController，实现发送位置到聊天界面。

技术指南 iOS
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1.创建 RCLocationPickerViewController 的子类：RCDLocationViewController，可以实现自定义导航栏左右按钮，代码如下：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"自定义左按钮" style:UIBarButtonItemStyleDone target:self action:@selector(leftItemDidPressed:)];
    self.navigationItem.leftBarButtonItem.tintColor = [UIColor redColor];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"自定义右按钮" style:UIBarButtonItemStyleDone target:self action:@selector(rightItemDidPressed:)];
    self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
}
- (void)leftItemDidPressed:(id)sendr {
    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)rightItemDidPressed:(id)sendr {
    [super rightBarButtonItemPressed:nil];
}

2.在聊天页子类重写以下下方法，并设置代理，present 到子类的对象中。

- (void)pluginBoardView:(RCPluginBoardView *)pluginBoardView clickedItemWithTag:(NSInteger)tag {
    switch (tag) {
        case PLUGIN_BOARD_ITEM_LOCATION_TAG: {
            RCDLocationViewController *vc = [[RCDLocationViewController alloc] init];
            vc.delegate = self;
            UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:vc];
            [self presentViewController:navi animated:YES completion:nil];
        }
            break;
            
        default:
            [super pluginBoardView:pluginBoardView clickedItemWithTag:tag];
            break;
    }
}

3.聊天页子类需要遵循代理 RCLocationPickerViewControllerDelegate，并实现方法：

- (void)locationPicker:(RCLocationPickerViewController *)locationPicker
     didSelectLocation:(CLLocationCoordinate2D)location
          locationName:(NSString *)locationName
         mapScreenShot:(UIImage *)mapScreenShot {
    RCLocationMessage *locationMessage =
    [RCLocationMessage messageWithLocationImage:mapScreenShot location:location locationName:locationName];
    [self sendMessage:locationMessage pushContent:nil];
}