UIImagePickerController在iPhone和iPad中用法的一点不同
2013-03-05 15:10
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我们知道,在iPhone中获取照片库常用的方法如下:
这对iPhone的操作是没有问题的。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:
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。
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的操作是没有问题的。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(0,0,300,300) 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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