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 = [[UIImagePickerController alloc] 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;
[self presentModalVIEwController:m_imagePicker animated:YES];
[m_imagePicker release];
}else {
UIAlertVIEw *alert = [[UIAlertVIEw alloc]initWithTitle:nil message:@"Error accessing photo library!" delegate:nil cancelbuttonTitle:@"Close" otherbuttonTitles:nil];
[alert show];
[alert release];
}
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 via UIPopoverController'
所以我们必须通过UIPopoverController来实现才行。具体实现如下:
UIImagePickerController *m_imagePicker = [[UIImagePickerController alloc] 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.vIEw permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; //[self presentModalVIEwController:m_imagePicker animated:YES]; [popover release]; [m_imagePicker release]; }else { UIAlertVIEw *alert = [[UIAlertVIEw alloc]initWithTitle:nil message:@"Error accessing photo library!" delegate:nil cancelbuttonTitle:@"Close" otherbuttonTitles:nil]; [alert show]; [alert release]; } 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。
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