技术沙龙之IOS相机管理

绝地灬酷狼 2021-12-10 11:21 215阅读 0赞

iOS技术开发人员非常注重对于IOS相机的管理，下面来简单介绍一下其使用过程：

## 相机简介 ##

相机是移动设备的共同特点之一，我们能够使用相机拍摄图片，并在应用程序里调用它，而且相机的使用很简单。

### 实例步骤 ###

1、创建一个简单的View based application

2、在ViewController.xib中添加一个button （按钮），并为该按钮创建IBAction

3、添加一个 image view （图像视图），并创建一个名为imageView的IBOutlet

4、ViewController.h文件代码如下所示：

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

5、修改ViewController.m,如下所示：

#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

### 输出 ###

运行该应用程序并单击显示相机按钮时，我们就会获得下面的输出

![20190713193749315.png][]

只要拍照之后，就可以通过移动和缩放对图片进行编辑，如下所示。

![2019071319380329.png][]

[20190713193749315.png]: /images/20211210/8283ab11dbb84b1e8e70520577cbf20f.png
[2019071319380329.png]: /images/20211210/6d0fc453b25445faa7d982d8e7af6add.png