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,並在應用程序裡調用它,而且相機的使用很簡單。
1、創建一個簡單的View based application
2、在ViewController.xib中添加一個button (按鈕),並為該按鈕創建IBAction
3、添加一個 image view (圖像視圖),並創建一個名為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
運行該應用程序並單擊顯示相機按鈕時,我們就會獲得下面的輸出
只要拍照之後,就可以通過移動和縮放對圖片進行編輯,如下所示。