我有一个适用于 iPhone 和 iPad 的通用应用程序。使用下面的代码我尝试从照片库或相机获取图片。对于 iPhone，它工作正常，但对于 iPad，当我单击警报 View 中的任何按钮时，它不会显示任何内容。可能是什么问题？
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
if (buttonIndex == 0) {
UIImagePickerController* picker = [[UIImagePickerController alloc] init];
picker.allowsEditing = YES;
picker.delegate = self;
camera = NO;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
} else if (buttonIndex == 1) {
BOOL hasCamera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
camera = YES;
UIImagePickerController* picker = [[UIImagePickerController alloc] init];
picker.allowsEditing = YES;
picker.delegate = self;
picker.sourceType = hasCamera ? UIImagePickerControllerSourceTypeCamera : UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
}
}else {
// We are using an iPad
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
popoverController=[[UIPopoverController alloc] initWithContentViewController:imagePickerController];
popoverController.delegate=self;
[popoverController presentPopoverFromRect:[self.view bounds] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (clickedButton == YES) {
UIImage *originalImage, *editedImage;
editedImage = (UIImage *) [info objectForKey: UIImagePickerControllerEditedImage];
originalImage = (UIImage *) [info objectForKey: UIImagePickerControllerOriginalImage];
if (editedImage) {
thisImage = editedImage;
} else {
thisImage = originalImage;
}
imageThis.image = thisImage;
NSData *imageData = UIImageJPEGRepresentation(thisImage, 30);
[defaults setObject:imageData forKey:@"thisImage"];
[defaults synchronize];
// [[NSUserDefaults standardUserDefaults] setObject:UIImagePNGRepresentation(thisImage) forKey:@"thisImage"];
}
else {
UIImage *originalImage, *editedImage;
editedImage = (UIImage *) [info objectForKey: UIImagePickerControllerEditedImage];
originalImage = (UIImage *) [info objectForKey: UIImagePickerControllerOriginalImage];
if (editedImage) {
thatImage = editedImage;
} else {
thatImage = originalImage;
}
imageThat.image = thatImage;
NSData *imageData = UIImageJPEGRepresentation(thatImage, 30);
[defaults setObject:imageData forKey:@"thatImage"];
[defaults synchronize];
//[[NSUserDefaults standardUserDefaults] setObject:UIImagePNGRepresentation(thatImage) forKey:@"thatImage"];
}
[picker dismissModalViewControllerAnimated:YES];
}
最佳答案
那是因为您在 iPad 上使用 UIActionSheet。在 iPad 上，UIActionSheet 使用 UIPopoverController 来呈现工作表，并且在 UIActionSheetDelegate 方法中，当 UIActionsheet 使用的第一个 UIPopoverController 尚未隐藏时，您可以使用另一个 UIPopoverController。您需要知道的是，任何时候屏幕上只能显示一个 UIPopoverController。
关于iphone - UIPopoverController 不显示在 iPad 上，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12126126/