iphone照相机和照片库

1、创建UIImagePickerController 实例

2、设置委托

3、指定图像源

4、将图像呈现给用户

需要遵循UIImagePickerControllerDelegate和UINavigationControllerDelegate协议。

、h文件

#import <UIKit/UIKit.h>


@interface CameraViewController : UIViewController 
<UIImagePickerControllerDelegate, UINavigationControllerDelegate> {
    UIImageView *imageView;
    UIButton *takePictureButton;
    UIButton *selectFromCameraRollButton;
}
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIButton *takePictureButton;
@property (nonatomic, retain) IBOutlet UIButton *selectFromCameraRollButton;
- (IBAction)getCameraPicture:(id)sender;
- (IBAction)selectExistingPicture;
@end

、m文件

#import "CameraViewController.h"


@implementation CameraViewController
@synthesize imageView;
@synthesize takePictureButton;
@synthesize selectFromCameraRollButton;


- (void)viewDidLoad {
    if (![UIImagePickerController isSourceTypeAvailable:
          UIImagePickerControllerSourceTypeCamera]) {
        takePictureButton.hidden = YES;
        selectFromCameraRollButton.hidden = YES;
    }
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
    self.imageView = nil;
    self.takePictureButton = nil;
    self.selectFromCameraRollButton = nil;
    [super viewDidUnload];
}
- (void)dealloc {
    [imageView release];
    [takePictureButton release];
    [selectFromCameraRollButton release];
    [super dealloc];
}
#pragma mark -
- (IBAction)getCameraPicture:(id)sender {
    UIImagePickerController *picker =
    [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsImageEditing = YES;
    picker.sourceType = (sender == takePictureButton) ? 
    UIImagePickerControllerSourceTypeCamera :
    UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    [self presentModalViewController:picker animated:YES];
    [picker release];
    
}
- (IBAction)selectExistingPicture {
    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController *picker =
        [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsImageEditing = YES;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }
    else {
        UIAlertView *alert = [[UIAlertView alloc] 
                              initWithTitle:@"Error accessing photo library" 
                              message:@"Device does not support a photo library" 
                              delegate:nil 
                              cancelButtonTitle:@"Drat!" 
                              otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
}
#pragma mark  -
- (void)imagePickerController:(UIImagePickerController *)picker 
        didFinishPickingImage:(UIImage *)image
                  editingInfo:(NSDictionary *)editingInfo {
    imageView.image = image;
    [picker dismissModalViewControllerAnimated:YES];
    
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    
    [picker dismissModalViewControllerAnimated:YES];
}
@end