UIImagePickerController在iPhone和iPad中用法的一点不同

概述UIImagePickerController在iPhone和iPad中用法的一点不同 我们知道，在iPhone中获取照片库常用的方法如下： UIImagePickerController *m_imagePicker = [[UIImagePickerControlleralloc] init];     if([UIImagePickerController isSourceTypeAvail UIImagePickerController在iPhone和iPad中用法的一点不同 我们知道，在iPhone中获取照片库常用的方法如下： UIImagePickerController *m_imagePicker = [[UIImagePickerControlleralloc] init];
    if([UIImagePickerController isSourceTypeAvailable:
       UIImagePickerControllerSourceTypePhotolibrary]){
      m_imagePicker.sourceType =UIImagePickerControllerSourceTypePhotolibrary;
      m_imagePicker.delegate = self;
      //      [m_imagePicker.navigationbar.subvIEws];
      [m_imagePicker setAllowsEditing:NO];
      //m_imagePicker.allowsImageEditing = NO;
       [selfpresentModalVIEwController:m_imagePicker animated:YES];
      [m_imagePicker release];
    }else{
       UIAlertVIEw*alert = [[UIAlertVIEw alloc]initWithTitle:nil message:@"Erroraccessing photo library!" delegate:nil cancelbuttonTitle:@"Close"otherbuttonTitles:nil];
       [alertshow];
       [alertrelease];
    } 这对iPhone的 *** 作是没有问题的。但是当我们在iPad环境中却有问题了，当我们运行时会报如下错误： Terminating app due to uncaught exception'NSInvalIDArgumentException',reason: 'On iPad,UIImagePickerController must be presented viaUIPopoverController' 所以我们必须通过UIPopoverController来实现才行。具体实现如下： UIImagePickerController *m_imagePicker = [[UIImagePickerControlleralloc] init];     if([UIImagePickerController isSourceTypeAvailable:        UIImagePickerControllerSourceTypePhotolibrary]){       m_imagePicker.sourceType =UIImagePickerControllerSourceTypePhotolibrary;       m_imagePicker.delegate = self;       [m_imagePicker setAllowsEditing:NO];       UIPopoverController *popover = [[UIPopoverController alloc]initWithContentVIEwController:m_imagePicker];       self.popoverController = popover;       //popoverController.delegate = self;               [popoverController presentPopoverFromrect:CGRectMake(0,300,300) inVIEw:self.vIEwpermittedArrowDirections:UIPopoverArrowDirectionAnyanimated:YES];                //[selfpresentModalVIEwController:m_imagePicker animated:YES];        [popoverrelease];       [m_imagePicker release];     }else{        UIAlertVIEw*alert = [[UIAlertVIEw alloc]initWithTitle:nil message:@"Erroraccessing photo library!" delegate:nil cancelbuttonTitle:@"Close"otherbuttonTitles:nil];        [alertshow];        [alertrelease];     } 这里需要注意，对局部UIPopoverController对象popover我们赋给了一个全局的UIPopoverController对象popoverController。而不能直接调用popover。因为在popover对象还可见时，是不能够被释放的。 总结

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