iOS 拍照以及從相簿取出照片

最近在開發camera and album 相關功能的app。將一些用法以及代碼筆記下來。

LCSViewController.h and LCSViewController.m

#import 

@interface LCSViewController:UIViewController
@property(nonatomic,retain)IBOutlet UIImageView *imageView;
@property(nonatomic,retain)IBOutlet UIBarButtonItem *saveImageBotton;

-(IBAction)showCameraAction:(id)sender;//拍照
-(IBAction)saveImageAction:(id)sender;//將照片存到相簿
-(IBAction)pickPhotoFromLibery:(id)sender;//從相簿取出照片

@end

#import "LCSViewController.h"

@interface LCSViewController ()

@end

@implementation LCSViewController
@synthesize imageView;
@synthesize saveImageBotton;

#pragma mark - Show camera
-(IBAction)showCameraAction:(id)sender
{
    UIImagePickerController *imagePickController=[[UIImagePickerController alloc]init];
    //You can use isSourceTypeAvailable to check
    imagePickController.sourceType=UIImagePickerControllerSourceTypeCamera;
    imagePickController.delegate=self;
    imagePickController.allowsEditing=YES;
    imagePickController.showsCameraControls=YES;
    //This method inherit from UIView,show imagePicker with animation
    [self presentModalViewController:imagePickController animated:YES];
    [imagePickController release];
}

#pragma mark - Show Album
-(IBAction)pickPhotoFromLibery:(id)sender{

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    picker.allowsEditing = YES;         
    [self presentModalViewController:picker animated:YES];
    [picker release];

}


#pragma mark - When Tap Save Button
-(IBAction)saveImageAction:(id)sender
{
    UIImage *image=imageView.image;
    //save photo to photoAlbum
    UIImageWriteToSavedPhotosAlbum(image,self, @selector(CheckedImage:didFinishSavingWithError:contextInfo:), nil);
    saveImageBotton.enabled=NO;
    
    NSLog(@"save image");
}

#pragma mark - Check Save Image Error
- (void)CheckedImage:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    
    UIAlertView *alert;
    
    if (error) {
        alert = [[UIAlertView alloc] initWithTitle:@"錯誤"
                                           message:[error description]
                                          delegate:self
                                 cancelButtonTitle:@"確定"
                                 otherButtonTitles:nil];
    } else {
        alert = [[UIAlertView alloc] initWithTitle:@"成功"
                                           message:@"照片已經存到相簿"
                                          delegate:self
                                 cancelButtonTitle:@"確定"
                                 otherButtonTitles:nil];
    }
    
    [alert show];
    [alert release];
}

#pragma mark - When Finish Shoot

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *originalImage=[info objectForKey:UIImagePickerControllerOriginalImage];
    //Show OriginalImage size
    imageView.image=originalImage;
    saveImageBotton.enabled=YES;
    [self dismissModalViewControllerAnimated:YES];
}

#pragma mark - When Tap Cancel

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
    [picker dismissModalViewControllerAnimated:YES]; 
}


#pragma mark - Release object

- (void)dealloc {
    [imageView release];
    [saveImageBotton release];
    [super dealloc];
}