//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;//    }    //sourceType = UIImagePickerControllerSourceTypeCamera; //照相机    //sourceType = UIImagePickerControllerSourceTypePhotoLibrary; //图片库    //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片    UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化    picker.delegate = self;    picker.allowsEditing = YES;//设置可编辑    picker.sourceType = sourceType;    [self presentModalViewController:picker animated:YES];//进入照相界面    [picker release];

UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {        pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;        //pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;        pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];            }    pickerImage.delegate = self;    pickerImage.allowsEditing = NO;    [self presentModalViewController:pickerImage animated:YES];    [pickerImage release];

UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片    UIImagePickerController *picker = [[UIImagePickerController alloc] init];    picker.delegate = self;    picker.allowsEditing = NO;//是否允许编辑    picker.sourceType = sourceType;    /*     如果从一个导航按钮处呈现，使用：     presentPopoverFromBarButtonItem:permittedArrowDirections:animated:；     如果要从一个视图出呈现，使用：     presentPopoverFromRect:inView:permittedArrowDirections:animated:          如果设备旋转以后，位置定位错误需要在父视图控制器的下面方法里面重新定位：     didRotateFromInterfaceOrientation:（在这个方法体里面重新设置rect）     然后再次调用：     - (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated                  */    //UIPopoverController只能在ipad设备上面使用；作用是用于显示临时内容，特点是总是显示在当前视图最前端，当单击界面的其他地方时自动消失。    UIPopoverController *popover = [[UIPopoverController alloc]initWithContentViewController:picker];    self.imagePicker = popover;    //permittedArrowDirections 设置箭头方向    [self.imagePicker presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];    [picker release];    [popover release];