获取本地相册或调用相机

- (void) addPicEvent
{
 //先设定sourceType为相机，然后判断相机是否可用（ipod）没相机，不可用将sourceType设定为相片库
 UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
    if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
          sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
     }   
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = sourceType;
    [self presentModalViewController:picker animated:YES];
    [picker release]; 
}
- (void)saveImage:(UIImage *)image {
 addImage = image;
 [addPic setImage:image forState:UIControlStateNormal];
}

#pragma mark -
#pragma mark Camera View Delegate Methods
- (void)imagePickerController:(UIImagePickerController *)picker 
didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissModalViewControllerAnimated:YES];
    UIImage *image = [[info objectForKey:UIImagePickerControllerEditedImage] retain];
    [self performSelector:@selector(saveImage:) 
               withObject:image 
               afterDelay:0.5];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissModalViewControllerAnimated:YES];
}