I have a tab bar application. I have 2 questions.
Using a default image for the
application does that enable the
application to initialize itself (the
first view that is showed in
MainView.xib) in the background while
the image is being displayed?
Touching the second tab in the
application, the application will
load data into a UITableView. This
takes some time (fetching some data
from the internet) so going from the
first tab to the second tab there is
a delay before the table is being
showed in the second tab. I want to
display a UIActivityIndicatorView while
the UITableView is being populated
and then want the
UIActivityIndicatorView to disappear
when the UITableView is finished
loading. How can I achieve this?
You can use this inside the activity:
protected Dialog onCreateDialog(int id) {
ProgressDialog progress = new ProgressDialog(this);
progress.setMessage("The information is gathered, one moment please.");
progress.setIndeterminate(true);
progress.setCancelable(false);
progress.setCanceledOnTouchOutside(false);
return progress;
}
This will show an alert once you call this in(or on) the activity:
showDialog(0x0001);
When the dialog has to fade out call this:
removeDialog(0x0001);
EDIT
Now for objective-c:
UIAlertView alert = [UIAlertView initWithTitle:#"a title" message:#"a message" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil]
[alert show];
if(alert != nil) {
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
indicator.center = CGPointMake(alert.bounds.size.width/2, alert.bounds.size.height-45);
[indicator startAnimating];
[alert addSubview:indicator];
[indicator release];
}
EDIT
Removing it is done with this:
[alert dismissWithClickedButtonIndex:0 animated:YES];
[alert release];
/EDIT
That worked for me:) it could be its not totally spot on becouse i changed some stuff in the browser to now thow company secrets etc xD :).
Feel free to ask stuff about it.
YES. Even if you don't give any default image, it will load the first view controller showing a black screen.
Display the activity indicator view in your second view controller's loadView. And, put all the loading code in your second view controllers viewDidAppear: method. By doing this, your second view controller will be displayed with the activity indicator view as soon as you press the second tab. And after the loading is completed, dismiss the activity indicator. This will give you a smooth transition from one tab to the other.
Related
I have looked around but haven't found a satisfying answer. My problem is that whenever I call popToRootViewControllerAnimated:(BOOL) it is not doing anything. When I NSLog it, it logs (null).
Let me back up a bit here. I have a table view controller that has a list of things, at the navigation bar up top there is an option to add and that takes me to a new view controller with a segue "Present as PopOver" which gets rid of the principal or main navigation bar. So I made one manually and added 2 bar button items "Cancel" and "Add". When "Cancel" is tapped, it should take the user back to the table view controller and discard changes, when "Add" button is tapped, it should also take user back to the previous table view controller with the changes. But it's not doing anything.
Here is my code.
- (IBAction)cancelButton:(UIBarButtonItem *)sender {
UINavigationController * navigationController = self.navigationController;
NSLog(#"%#", navigationController);
NSLog(#"cancel tapped though");
ListingTableViewController *rootController = [[ListingTableViewController alloc] init];
[navigationController popToRootViewControllerAnimated:NO];
[navigationController pushViewController:rootController animated:YES];
}
As far as the segue, this view controller is not connected to anything, or should I connect it? This is a noobish question indeed. Here is my xcode screenshot.
Check this link for the screenshot of the storyboard
http://i.stack.imgur.com/lqnCF.png
You must call
- (IBAction)cancelButton:(UIBarButtonItem *)sender {
NSLog(#"cancel tapped though");
[self dismissViewControllerAnimated:YES completion:nil];
}
instead of popToRootViewControllerAnimated because your VC presented and not pushed!
When presenting a view, you are not pushing it in your navigation controller, but having it presented. To dismiss it, try using [self.presentingViewController dismissViewControllerAnimated:NO completion:nil].
I am working with Objective C using xcode and SUP 2.1.3 as backend.I am verymuch new to the technology.I have created a project with master detail as the design template.In that in the detail view I am using a popup to display some details.And also I have a button over there. When I click in this button I have to go to the next UIView in popup itself.
For that I have created two more UIViewControllers (viewController1 and viewController2).
And in detailview I have written the code for a popup like,
-(void)popupAgain
{
ViewController1 *viewController = [[ViewController1 alloc] initWithNibName:#"ViewController1" bundle:nil];
viewController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:viewController animated:YES];
[viewController release];
}
And I put a button over their in that popup, I am calling the next popupAgain funcion to get viewController2 like
-(IBAction)next:(id)sender
{
[self popupAgain];
}
-(void)popupAgain
{
ViewController2 *viewController_new = [[ViewController2 alloc] initWithNibName:#"ViewController2" bundle:nil];
viewController_new.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:viewController animated:YES];
[viewController_new release];
}
Now the problem is when I click on the next button I have to dismiss the first popup and display the second.But I am not able to dissmiss the first one even if I am writing the code [self dissmissModalViewControllerAnimated:YES]; in the action for next button like,
-(IBAction)next:(id)sender
{
[self dissmissModalViewControllerAnimated:YES];
[self popupAgain];
}
Please anyone help me to solve this issue.Or do you have any other idea regarding this?I am very much new to the technology.Thank you very much for any help in advance.
See here:
http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ModalViewControllers/ModalViewControllers.html#//apple_ref/doc/uid/TP40007457-CH111-SW1
Dismissing a Presented View Controller
When it comes time to dismiss a presented view controller, the preferred approach is to let the presenting view controller dismiss it. In other words, whenever possible, the same view controller that presented the view controller should also take responsibility for dismissing it. Although there are several techniques for notifying the presenting view controller that its presented view controller should be dismissed, the preferred technique is delegation. For more information, see “Using Delegation to Communicate with Other Controllers.”
I am having a problem correctly implementing a UIActionSheet in an iPad 5.1 (XCode 4.3) project. I can populate it correctly with all the items I need. The list is longer than the window, but the scrollbars automatically come up, etc. However, the cancel button (which I presume is supposed to be at the end) is coming up half hidden behind my tab bar. Shown below:
(sorry, SO won't let me post images yet)
Here is my storyboard setup:
The entry point is that Tab Bar Controller on the left, which goes to another Navigation Controller (center), which has the View Controller on the right as the root view.
http://i854.photobucket.com/albums/ab103/srVincentVega/ScreenShot2012-06-28at52713PM.png
I have tried presenting the UIActionSheet in all sorts of ways, but this odd behavior persists, and I can't figure out how to address it
- (IBAction)cmdReason:(id)sender
{
NSArray *reasons = [AppState getInspReasons];
UIActionSheet *action = [[UIActionSheet alloc]
initWithTitle:#"Reason for Inspection"
delegate:self
cancelButtonTitle:#"Cancel"
destructiveButtonTitle:nil
otherButtonTitles:nil];
for (NSString *rsn in reasons)
{
[action addButtonWithTitle:rsn];
}
[action showInView:self.view];
}
I have tried the various methods to show "action" - showFromTabBar, showFromToolbar, etc - I am VERY new to this development environment, so I am not up to speed yet on how these items interact at this level. Does anyone have a suggestion for how I can present this correctly?
I am sorry if this has already been asked elsewhere. I have spent all day trying bits of code from all over the web, including SO. I don't know if it's something to do with my storyboard layout, or what.
One further thing - when I rotate the emulator, the action sheet does redraw, but the bit at the end there gets wonky looking, like it can no longer figure out how to draw it.
Many thanks!
EDIT:
I have put together a very small project that demonstrates this exact behavior. I don't have a good way to host the zip file, so I put on google docs and shared it. The link is below. If you click on that, there should be a download option under file that will give you the original zip file.
https://docs.google.com/open?id=0B7IYvy9_c_NLaEFneGc5bzc2S2c
Seems like there is not a real solution for this. It looks like it's a limitation with UIActionSheet if you add that amount of button titles and present that from a tab bar.
Beside that, the proper way to display an UIActionSheet from a tab bar is to use
[action showFromTabBar:self.tabBarController.tabBar];
instead of
// Taken from your example project
AppDelegate *d = [[UIApplication sharedApplication] delegate];
UIWindow *w = d.window;
UIViewController *vc = w.rootViewController;
UITabBarController *c = (UITabBarController *)vc;
UITabBar *t = c.tabBar;
[action showFromTabBar:t];
I would think if you got a reference to the tab bar controller then you should be able to present it from that. You can try showing it from the main window but I would think you shouldn't rely on that.
[action showInView:[[UIApplication sharedApplication] keyWindow]];
Try this:
CGRect r = CGRectMake(x, y, w, h); //change values to fit location of button
[actionSheet showFromRect:r inView:self.view animated:YES];
I used it on one of my apps with the same problem and the dismiss button showed up ok.
I have a view that uses a modal view with a page curl to allow for a username to be entered. This username is then verified with a web-based service to see if it is valid.
Everything works great until you enter an invalid username and click outside the modal view. This still checks the username, which is reported invalid and a UIAlertView opens. However, it goes back to the parent view.
Is there any way to get the modal to not dismiss in this case?
I have tried to reload the view but either it isn't working or the UIAlertView is blocking it. The last idea I have is to couple displaying the modal view with the "OK" on the alert for an invalid username. Anyone have any ideas?
If you were not using a UINavigationController You could put something like this in the view controller that calls the modal view:
-(void)dismissModalViewControllerAnimated:(BOOL)animated{
if (_someFlagForBeingProperlyLoggedIn) [super dismissModalViewControllerAnimated:animated];
}
When you tap on the page curl the presenting/parent view controller is sent dismissModalViewControllerAnimated:.
Since you are using a navigation controller your options are limited. This is because UINavigationController is a subclass of UIViewController, and a self centered one at that. When you click the page curl it's dismissModalViewControllerAnimated: is being called.
You still have the option of subclassing UINavigationController and implementing the above method, but that will get messy in a hurry.
Having the UIAlertView "direct back" to the modal login view IS very easy. Have that main view conform to the UIAlertViewDelegate protocol. When you display the alert set that instance as the delegate, and in that class implement the method:
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
// Enclose in if (buttonIndex == #) for selective calling
UINavigationController* nav = (UINavigationController*)[[UIStoryboard storyboardWithName:#"MainStoryboard_iPhone" bundle:nil] instantiateViewControllerWithIdentifier:#"Preferences"];
[nav setModalTransitionStyle:UIModalTransitionStylePartialCurl];
[self.navigationController presentModalViewController:nav animated:YES];
}
Then when the alert view is dismissed it will show the 'login' view.
You should redisplay your modal view with a little delay, something about 0.3-0.5. that's the amount of time needed to alert to be dismissed and that is exactly animation(the dismissing of the alert view) that prevent the modal view from showing up.
-(void)showModal{
SomeModalViewClass* modalView = [[SomaModalViewClass alloc]init];
[self setModalTransitionStyle:UIModalTransitionStylePartialCurl];
[self presentModalViewController:modalView animated:YES];
[modalView release];
}
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
//check the button index if needed and then
[self performSelector:#selector(showModal) withObject:nil afterDelay:0.3];
}
I've got a strange problem, I managed to blend UIActionSheet together with UIPickerView and invoke them both from UITextField, but the problem is that in order to use UIPickerView I have to click/tap on "Done" button first. Then, the picker view becomes usable. But, initially, when the picker view appears, it is frozen and unusable - the wheel doesn't move. Only after I tap on "Done", the background gets more transparent, I can see in the background the other UITextFields that I added to the scrollView, and I can move the wheel at that point. So to move the wheel I need to first tap on either "Cancel" or "Done", it's frozen when it appears at first.
Here's my code (some of it is from researching)
myPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,185,0,0)];
myPicker.delegate = self;
myPicker.showsSelectionIndicator = YES;
UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:#"Title" delegate:self cancelButtonTitle:#"Done" destructiveButtonTitle:#"Cancel" otherButtonTitles:nil];
[menu addSubview:myPicker];
[menu showInView:self.view];
[menu setBounds:CGRectMake(0,0,320, 700)];
[myPicker release];
[menu release];
The solution I thought of is to automatically make "Done" be tapped first time so user doesn't have to tap on "Done" to use the wheel and then tap on "Done" again when selection from the wheel is chosen. But I'm not sure that's the right approach.
I also tried to make it:
[menu showInView:scrollView];
But the result was the same - wheel doesn't move.
Anybody knows how I should solve this?
Thank you,
Victor.
There's no way your app will be approved if you misuse UIActionSheet in this way, and it's not designed to work in this way, and (as you've found and as I've found when I once tried it) it does funny things when you try to use it in this way. So it's not work the effort to get it working.
You should use a standard full screen view containing your picker and then use presentModalController:. You could alternatively manually add the picker as a subview of your main view, if the intention is to have it as an overlay.