# IOS相機管理
## 相機簡介
相機是移動設備的共同特點之一，我們能夠使用相機拍攝圖片，并在應用程序里調用它，而且相機的使用很簡單。
### 實例步驟
1、創建一個簡單的View based application
2、在ViewController.xib中添加一個button （按鈕），并為該按鈕創建IBAction
3、添加一個 image view （圖像視圖），并創建一個名為imageView的IBOutlet
4、ViewController.h文件代碼如下所示：
```
#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
```
### 輸出
運行該應用程序并單擊顯示相機按鈕時，我們就會獲得下面的輸出
只要拍照之后，就可以通過移動和縮放對圖片進行編輯，如下所示。
