Usually after the viewController is pushed, I want to do certain things. In add phone feature, for example, I would open edit business and set the focus to the phone field.
If after viewController is pushed users press back button too quickly the app crash.
What's the standard way to do so?
This is the code:
+(BGBusinessEditViewController *) pushNewEditViewControllerWithBizandReturnValue: (Business *)biz withNavController :(UINavigationController *) nav andSelectPhone:(BOOL) selectPhoneAfterward
{
BGBusinessEditViewController * editBusiness = [[BGBusinessEditViewController alloc]init];
//[editBusiness view];//load the stuff first
[nav vPushViewController:editBusiness animated:YES andPerformBlock:^{
if (biz) {
editBusiness.biz=biz; //viewDidload must be called first before setting bizs
}
if (selectPhoneAfterward)
{
[editBusiness selectPhone];
}
}];
return editBusiness;
}
-(void) selectPhone
{
NSIndexPath * ipth =[NSIndexPath indexPathForItem:BGBusinessEditTextPhoneNumber inSection:0];
[self.tableView selectRowAtIndexPath: ipth animated:NO scrollPosition:UITableViewScrollPositionTop];
[self tableView:self.tableView didSelectRowAtIndexPath:ipth];
}
Basically I created a category in nav View Controller that will run code only when the navigation controller already reach - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
Well, Hide the back button until viewDidAppear, and then unhide it.
Related
Been trying to get the button to change from "edit" to "done". I am doing a tutorial and it seems to work on their end but not mine. I can't seem to find the issue.
The code:
- (IBAction)onEditButtonTapped:(UIBarButtonItem *)sender {
[self.tableView setEditing:true animated:true];
sender.style = UIBarButtonItemStyleDone;
sender.title = #"Done";
}
You are doing it the hard way. UIViewController already provides such a button.
Lets assume you want this button on the right side of the navigation bar.
In viewDidLoad, you want:
self.navigationItem.rightBarButtonItem = [self editButtonItem];
Then to handle the button, simply override the setEditing:animated: method:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.tableView setEditing:editing animated:animated];
}
The button returned by the editButtonItem method is setup to call the setEditing:animated: method for you. There's no setup required.
I assume this means you have added your own table view to a UIViewController. If you are using a UITableViewController then you don't need the call to self.tableView setEditing... since it is already done for you.
If you really want to use your own button. Make sure you set the possibleTitles property of the UIBarButtonItem.
I know this has been asked but I've tried all the solutions to no avail.
One of the tabs of my application is Logs
When it is selected a log viewcontroller with a list of logs is displayed
I have a "+" on the top menu bar to add new logs
When I select it I push the add log view controller on the stack
I add a new log - I then take the back button
when I return to the table the list is not updated
I wanted to reload the data in the table upon returning to the first view controller but
neither viewDidLoad, viewDidAppear or viewWillAppear are fired upon returning to the table
Since the first screen is oblivious
I added these to the second screen in an attempt to find any action occurring when the back button
-(void)viewWillDisappear{
NSLog(#" whered it go");
}
-(void)viewDidDisAppear
{
NSLog(#" disapeeeeeearing");
}
- (void)backAction {
NSLog(#" WHAT ABOTU THIS ");
[self.navigationController popViewControllerAnimated:YES];
}
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
[viewController viewWillAppear:animated];
NSLog(#"is ANY of this Happening");
}
NONE of these fire when the add screen disappears no NSLog printed
From what I've read the lack of response on the first screen is because the log table never really left the stack .
This didn't happen when I did this on another tab (different part of the app)
Whats different about this tab is the add log view controller has 5 subviews and can call modals (though it fails even when I don't call them) - I'm guessing it has something to do with that.
The call from the logs to the add logs
AddViewController *controller =[[AddViewController alloc] initWithNibName:#"AddViewController" bundle:nil];
controller.passString= newText;
[self.navigationController pushViewController:controller animated:YES];
Don't have any code for the return it just clicking on the back button at the top of the screen.
sorry for any misspellings
That's because you aren't using the correct methods.
-(void)viewWillDisappear{
NSLog(#" whered it go");
}
and
-(void)viewDidDisAppear
{
NSLog(#" disapeeeeeearing");
}
Aren't declared anywhere. I believe what you meant to write was:
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
NSLog(#"About to disappear");
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
NSLog(#"Did disappear");
}
Methods are case sensitive, and you can't just leave out arguments and expect it to work.
I have a parent class with tableview and searchbar over it which is a subclass of tableview controller. Delegates for the searchBar and searchdisplaycontroller are set in a seperate class inherited from UISearchdisplaycontroller. The datasource and delegates for tableview and searchbar are handled in this class seperately. The classes are under ARC.
Hence, When a user taps on search, the control transfers from FilesListController (parent)class to this class. Now, When a user taps on cancel button, the searchbar delegate set in this class i.e.
- (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar
is CALLED but DOESN'T serve the purpose of dismissing the full screen searchtableview and return to the parentviewcontroller. However, if I don't write this delegate in the search class, it works properly. I have set the searchbar delegates in xib and on calling:
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar
like this:
self.searchResultsTableView.delegate = self;
self.searchResultsTableView.dataSource = self;
[parentFileViewController.searchDisplayController setDelegate:self];
Where am I going wrong? Thanks in advance.
If you want to dismiss a UISearchBar with a SearchBarController, just use this Code:
[self.searchDisplayController setActive:NO animated:YES];
you should implement resign the responder in the delegate function i.e
- (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar {
[searchBar resignFirstResponder];
}
Memory warnings can appear at any time during the application run time, you must assume a memory warning will happen and the view and disposable objects will have to be recreated.
We are handling such situation by setting to nil our arrays:
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
if([self isViewLoaded] && self.view.window == nil)
{
self.view = nil;
keys = nil;
names = nil;
errorDuringNetworkCall = nil;
}
}
And by dismissing the search bar tableview before performing the segue operation:
[self performSegueWithIdentifier:#"navigateToNextScreen" sender:self];
self.searchBar.text = #"";
[self.searchDisplayController setActive:NO animated:YES];
After a Memory warning is received the viewDidLoad method is called again and the arrays are populated, the search bar will continue to be useful.work without issues
I have an app with a tab bar controller (2 tabs). In one tab view controller, a button leads to an alert window. I want one button of the alert window to call a table view containing possible answers. I want that table view to have a done button and a title. I think that means a navigation controller has to be used. But most everything I can find on navigation controllers assumes a much more complicated situation. Here's part of the alert window logic:
-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 2) {
AnswersViewController *aVC = [[AnswersViewController alloc] init];
[self presentViewController:aVC
animated:YES
completion:NULL];
}
}
And AnswersViewController looks like this:
#interface AnswersViewController : UITableViewController
#end
#implementation AnswersViewController
- (id) init
{
self = [super initWithStyle:UITableViewStylePlain];
return self;
}
- (id) initWithStyle:(UITableViewStyle)style
{
return [self init];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[self view] setBackgroundColor:[UIColor redColor]];
}
#end
This code all works as expected (an empty red UITableView appears).
Two questions I guess: 1. Is there a simple modification to what I have that can give me a done button and title in my table view? 2. If I have to go to a navigation controller (probably), how can I make a bare-bones navigation controller with a done button and title and embed the table view within it? Oh, and I want to do this programatically. And I think I prefer the done button and title to be in the navigation bar, no tool bar desired. Thanks!
To get what you are looking for, you do need to use a UINavigationController. That will provide the UINavigationBar where you can display a title and also buttons.
To implement this with a UINavigationController, you want to do smoothing like this (assuming you are using ARC, so you don't need to worry about memory management):
-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 2) {
AnswersViewController *aVC = [[AnswersViewController alloc] init];
//Make our done button
//Target is this same class, tapping the button will call dismissAnswersViewController:
aVC.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(dismissAnswersViewController:)];
//Set the title of the view controller
aVC.title = #"Answers";
UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:aVC];
[self presentViewController:aNavigationController
animated:YES
completion:NULL];
}
}
Then you would also implement - (void)dismissAnswersViewController:(id)sender in the same class as the UIAlertView delegate method (based on the implementation I have here).
Hope this helps!
I have a UITableView with some custom cells in it. In these custom cells I defined a UILongPressGestureRecognizer that triggers the edit mode of this table. So when someone presses and holds a cell for like 1.5 sec, the table goes into edit mode.
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(startEditMode:)];
Which triggers:
- (void)startEditMode:(UISwipeGestureRecognizer *)recognizer {
if (self.allowEdit) {
UITableView *table = (UITableView *)self.superview;
[table setEditing:YES animated:YES];
}
}
But what I want to do is detect when the table goes into edit mode because I need to show/hide some additional buttons in this case. But for some reason in my viewcontroller this is never executed:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
NSLog(#"SET EDITING");
[super setEditing:editing animated:animated];
}
Any suggestion why? Is this just being called when using a proper Edit Button as provided by default in the UINavigationController?
Or how can I detect when my UITableView goes into Edit Mode?
You're sending the message (setEditing) to the table view, you should be sending it to the view controller (presumably a UITableViewController subclass?). It will then take care of the table view for you.
Ok so in case someone else walks into this thread with the same problem, I will show you how I solved this.
In my custom UITableViewCell I have this method now:
- (void)startEditMode:(UISwipeGestureRecognizer *)recognizer {
if (self.allowEdit) {
UITableView *table = (UITableView *)self.superview;
UITableViewController *control = (UITableViewController *)table.dataSource;
[control setEditing:YES animated:YES];
}
}