iOS - 相机管理

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  简述

  相机是移动设备中的常见功能之一。我们可以用相机拍照并在我们的应用程序中使用它，这也很简单。
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  相机管理 - 涉及的步骤

  Step 1 - 创建一个简单的 View based application.

  Step 2 - 添加一个 button 在 ViewController.xib 并为按钮创建 IBAction。

  Step 3 - 添加一个 image view 并创建 IBOutlet 并将其命名为 imageView。

  Step 4 − 更新 ViewController.h 如下 -

  
  #import <UIKit/UIKit.h>
  @interface ViewController : UIViewController<UIImagePickerControllerDelegate> {
     UIImagePickerController *imagePicker;
     IBOutlet UIImageView *imageView;
  }
  - (IBAction)showCamera:(id)sender;
  @end
  

  Step 5 − 更新 ViewController.m 如下 -

  
  #import "ViewController.h"
  @interface ViewController ()
  @end
  @implementation ViewController
  - (void)viewDidLoad {
     [super viewDidLoad];
  }
  - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
  }
  - (IBAction)showCamera:(id)sender {
     imagePicker.allowsEditing = YES;
     
     if ([UIImagePickerController isSourceTypeAvailable:
     UIImagePickerControllerSourceTypeCamera]) {
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
     } else {
        imagePicker.sourceType = 
        UIImagePickerControllerSourceTypePhotoLibrary;
     }
     [self presentModalViewController:imagePicker animated:YES];
  }
  -(void)imagePickerController:(UIImagePickerController *)picker 
     didFinishPickingMediaWithInfo:(NSDictionary *)info {
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
        
        if (image == nil) {
           image = [info objectForKey:UIImagePickerControllerOriginalImage];
        }
     imageView.image = image;
  }
  -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
     [self dismissModalViewControllerAnimated:YES];
  }
  @end
  

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  输出

  当我们运行应用程序并单击显示相机按钮时，我们将获得以下输出 -

  

  拍照后，我们可以编辑图片，即移动和缩放，如下所示 -