在iOS版

Question

另一个查看打开相机如何从我的MainController.m类调​​用此方法和图像传递给我的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添加这些行：

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

和CameraController类添加属性（在CameraController.h）

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

在MainController.h，在接口实现添加协议;像这样：

@interface MainController : NSObject <CameraControllerDelegate> 

之前，你现在/推CameraController从MainController.m加入这一行：

cameraController.delegate = self; 

在MainController.m实现didFinishCapturingImage方法。

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

在图像选取器控制器代表，加入这一行：

- (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：

请在CameraController.h属性保持MainController对象的实例：

@property (nonatomic, strong) MainController *mainController; 

分配自我CameraController的实例的属性mainController在您使用CameraController：

cameraController.mainController = self; 

编辑您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]; 
} 

并实现以下方法MainController.m

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

唐忘记包括UIImagePickerControllerDelegate在MainController.h。

无需创建协议和实现协议方法..