How do you specify a group when initially displaying an ABPeoplePickerNavigationController (so it doesn't automatically display "All Contacts")?
Yeah, I do. I had to make it work.
Set your class as the delegate of the people picker (pp.delegate = self;)
Then implement:
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if([navigationController.viewControllers count] > 1) {
navigationController.delegate = nil;
[navigationController popViewControllerAnimated:NO];
}
}
It seems to work best with animation off, but still works with it on but sort of goofy. Only tested on simulator.
D
Related
I have created two instances of a MasterViewController derived from UIViewController class
_masterViewController = [[MasterViewController alloc] initWithNibName:#"MasterViewController_iPhone" bundle:nil];
// second instance with same class and duplicate nib view
_favItemMasterVC = [[MasterViewController alloc] initWithNibName:#"favMasterViewController_iPhone" bundle:nil];
Both the MasterViewController_iPhone & favMasterViewController_iPhone view are same.
Now I want to check which of the UIViewController is currently selected(eg:on tabbar).
How can i find the difference between both objects?
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
if ([viewController isKindOfClass:[_favItemListMasterVC class]]
{ // it is always called in both cases}
isMemberOfClass: // is also not working
How to check the difference?
Not sure I have understand what are you doing, but if _favItemListMasterVC and _masterViewController are pointing to the same VCs added to the UITabBar, you can check it simply comparing pointers
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
if (viewController == _favItemListMasterVC)
{
//the visible view controller is _favItemListMasterVC
}
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
if (viewController == _masterViewController)
{
}
else if (viewController == _favItemMasterVC)
{
}
}
I think you can use tag to check which is which. Tag is property of a UIView Set the tag value in the two xib files. And check the tag using code.
To compare objects you can also use:
if([viewController isEqual:_favItemMasterVC])
I'm trying to make a shake events.
I tried:
1) How do I detect when someone shakes an iPhone? (posts of Kendall, and Eran)
2) motionBegan: Not Working
but nothig helps.
My View becomes first responder, but motionBegan/motionEnded never called.
Is there some additiol settings must be done, or i'm missing somethig? My iOS SDK is 4.3.
I have a class of UIView:
#import "ShakeView.h"
#implementation ShakeView
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
NSLog (#"123");
if ( event.subtype == UIEventSubtypeMotionShake ) {
NSLog(#"Shake!");
}
if ([super respondsToSelector:#selector(motionEnded:withEvent:)]) {
[super motionEnded:motion withEvent:event];
}
}
#end
In my ViewController's xib class of View is ShakeView.
my ViewController pushed:
Wheel *secondViewController = [[Wheel alloc] initWithNibName:#"Wheel" bundle:nil];
[self.navigationController pushViewController:secondViewController animated:YES];
[secondViewController release];
In my ViewController:
- (void) viewDidAppear:(BOOL)animated
{
[self.view becomeFirstResponder];
[super viewWillAppear:animated];
NSLog(#"%d", [self.view isFirstResponder]);
}
- (void) viewWillDisappear:(BOOL)animated
{
[self.view resignFirstResponder];
[super viewWillDisappear:animated];
}
It logs "1", so it IS first responder. But it logs nothing else.
I spend a half day on this few lines of code, and I have no more ideas. Do anyone knows how to solve it?
Thanks.
This is much too late to help SentineL, but I was having the same problem and I like his question because it is clear that he has all the relevant code in place -- except one crucial line, in the application delegate's didFinishLaunching:
[self.window makeKeyAndVisible];
This is very hard to debug, because even without this line, everything else will be fine. Your gestures will work, your controls will respond, you will be able to make your view first responder (as SentineL checked) -- but your subclassed window or view or view controller will never receive the motion events.
Which doesn't make sense to me. Why would makeKeyAndVisible affect the accelerometer but not gestures? Hopefully some more experienced user can answer that.
P.S. If you use this code as an example, I would recommend that you omit the super respondsToSelector conditional. Of course it responds to the selector; you're overriding it.
I would like to invoke a certain method whenever the user selects a different tab of a UITabBarController. The following works for actual tabs on the tab bar but not for the 'tabs' on the More controller:
-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
[self doSomethingWhenAnotherVCIsSelected]
}
This method seems only to be called when a 'tab' is selected, including the 'more' tab. Whenever another VC on the 'more' tab is pushed, this is not called.
Is there any standard notification mechanism that can be used to detect if a VC was selected on the 'more' tab?
Call the method in the -viewWillAppear of the viewController.
Found the following workaround:
// subclass of UITabBarController
- (void)viewDidLoad
{
moreDelegate=self.moreNavigationController.delegate;
self.moreNavigationController.delegate=self;
...
}
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
[moreDelegate navigationController:navigationController willShowViewController:viewController animated:animated];
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
[moreDelegate navigationController:navigationController didShowViewController:viewController animated:animated];
[self tabBarController:self didSelectViewController:viewController];
}
I have a UINavigationController with two ViewControllers on the stack. At a certain point in the program execution, the second view controller is visible on the screen and at that moment, I would like to replace that ViewController with another. However, it's not working. Here is my code:
UINavigationController * thisNavController = self.waitingController;
// remove the Dummy and set the new page instead
NSMutableArray * newControllers = [NSMutableArray arrayWithArray: thisNavController.viewControllers];
[newControllers replaceObjectAtIndex: ([thisNavController.viewControllers count] - 1) withObject: page];
NSLog (#"visible before: %#", [thisNavController.visibleViewController description]);
[thisNavController setViewControllers: [NSArray arrayWithArray: newControllers] animated: YES];
NSLog (#"visible after: %#", [thisNavController.visibleViewController description]);
[thisNavController.visibleViewController.view setNeedsDisplay];
The above code produces this output:
2011-05-05 13:30:22.201 myApp[3286:207] visible before: <DummyViewController: 0x4c8b4c0>
2011-05-05 13:30:22.209 myApp[3286:207] visible after: <RealViewController: 0x60173f0>
But what is shown on the screen does not change. It seems that everything works fine after I switch tabs, so it seems that it is a redrawing problem, but setNeedsDisplay does nothing and I couldn't find a method that tells the NavigationController that its viewControllers have changed.
Is there some refresh mechanism that I have to trigger to refresh the screen?
One solution would be to say add 2 (initial) view controllers when your app is started, and only allow navigation from the 2nd and 3rd ones, falling back to the 1st (root) view controller in your senario described. You never allow navigation back to this 1st view controller or from this 1st view controller to the 2nd; you see this sort of behaviour in some of Apple's apps, like iTunes and Remote - if there's no network connect the app shows a no-network connection view immediately.
So, when you want to show the 1st view controller above, you do something like:
NSArray *array = [navigationController popToRootViewControllerAnimated:NO];
Without more info about the navigation behaviour of your app I hope this helps.
Or show a modal view controller?
The problem turned out to be the fact that I was trying to replace the view controller stack before the initial transition animation for the Dummy controller has finished. This can be prevented in the following manner.
First, preserve the (eventual) delegate, set the current object as the delegate, set a flag that animation is in progress and push the new controller:
self.oldNavigationControllerDelegate = self.waitingController.navigationController.delegate;
self.waitingController.navigationController.delegate = self;
self.isAnimating = YES;
[viewController.navigationController pushViewController: [[DummyViewController alloc] init] animated: YES];
Then, implement the UIViewControllerDelegate protocol methods as follows:
#pragma mark -
#pragma mark UINavigationControllerDelegate methods
- (void) navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (navigationController == self.waitingController.navigationController)
self.isAnimating = YES;
}
- (void) navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (navigationController == self.waitingController.navigationController) {
self.isAnimating = NO;
if (self.readyPage != nil)
[self pageIsReady: self.readyPage]; // method to load the ready controller
}
}
After that, whenever your content/controller/download/whatever is ready, make sure that the navigation controller is no longer animating. If it is, set a flag that the page is ready. If it isn't, load the page:
if (self.isAnimating)
self.readyPage = controller;
else
[self pageIsReady: controller];
And, of course, implement the actual loading of the new stack (as usual):
- (void) pageIsReady: (UIViewController *) page {
// this method should replace the dummy that is spinning there
UINavigationController * thisNavController = self.waitingController.navigationController;
// remove the Dummy and set the new page instead
NSMutableArray * newControllers = [NSMutableArray arrayWithArray: thisNavController.viewControllers];
[newControllers replaceObjectAtIndex: ([thisNavController.viewControllers count] - 1) withObject: page];
thisNavController.viewControllers = [NSArray arrayWithArray: newControllers];
thisNavController.delegate = self.oldNavigationControllerDelegate; // restore the original delegate
// clean up
self.isAnimating = NO;
self.readyPage = nil;
self.waitingController = nil;
self.oldNavigationControllerDelegate = nil;
}
This makes everybody happy :P
I have read the Apple docs - http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/TabBarControllers/TabBarControllers.html#//apple_ref/doc/uid/TP40007457-CH102-SW1 about creating TabBar programmatically. I want to detect the TabBar selection so I have used following delegate methods. I am not sure why but these methods don't get fired when I change the Tabs on my iPhone. Could anyone please provide some thought on what's going wrong here. It would be really helpful. Thanks.
- (BOOL)tabBarController:(UITabBarController *)tbController shouldSelectViewController:(UIViewController *)viewController
{
if (viewController == [tbController.viewControllers objectAtIndex:3] )
{
// Enable all but the last tab.
return NO;
}
return YES;
}
- (void)tabBarController:(UITabBarController *)tbController didSelectViewController:(UIViewController *)viewController {
if (viewController == [tbController.viewControllers objectAtIndex:self.appTabs.count] )
{
//do some action
}
}
Did you forget to set the delegate when you created the UITabBarController?
someTabBarController.delegate = self;