iphone照相机和照片库
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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
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