Question

如何从 MainController.m 类调用此方法并将Image传递给我的MainController

CameraController.m

- (void) openCamera {
       UIImagePickerController *picker = [[UIImagePickerController alloc]init];
       picker.delegate = self;
       picker.sourcetype = UIImagePickerContrllerSourceTypeCamera;
       [self presentViewContrller:picker animated:YES completion:nil];

}

我仍然是iOS开发的新手，是否可以使用委托？

编辑：CameraController没有笔尖。

Answer 1

在CameraController.h中添加以下行：

@protocol CameraControllerDelegate <NSObject>
- (void)didFinishCapturingImage:(UIImage*)image;
@end

并在CameraController类（CameraController.h）

中添加一个属性

@property (nonatomic, strong) id<CameraControllerDelegate> delegate;

在MainController.h中，在接口实现中添加协议;像这样：

@interface MainController : NSObject <CameraControllerDelegate>

在您CameraController添加此行之前/推送MainController.m：

cameraController.delegate = self;

在MainController.m实施didFinishCapturingImage方法。

- (void)didFinishCapturingImage:(UIImage*)image {
    //your logic
}

在Image Picker Controller Delegate中，添加以下行：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissViewControllerAnimated:YES completion: Nil];
    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    //this will send delegate callback to MainController
    [self.delegate didFinishCapturingImage:image];
}

编辑：第二个解决方案：

在CameraController.h中创建一个属性以保留MainController对象的实例：

@property (nonatomic, strong) MainController *mainController;

将自己分配到CameraController的实例的属性mainController，您使用CameraController：

cameraController.mainController = self;

编辑openCamera方法：

- (void) openCamera {
       UIImagePickerController *picker = [[UIImagePickerController alloc]init];
       picker.delegate = self.mainController; //important line
       picker.sourcetype = UIImagePickerContrllerSourceTypeCamera;
       [self.mainController presentViewContrller:picker animated:YES completion:nil];
}

并在MainController.m

中实施以下方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    //your logic
}

不要忘记在UIImagePickerControllerDelegate中加入MainController.h。

无需创建协议和实施协议方法。

在iOS中的另一个视图中打开相机

1 个答案: