I am using a UIView item on my view controller that contains a picker view and a button, which needs to appear on the screen only when the show button is clicked.
I created a outlet for my UIView with name *pickerView
The default position of this view (on the right properties bar of Xcode) is (0,200,320,261) for (x,y, height and width) which basically makes it appear at the base of the ViewController.
What I did for this view to hide initially when the view controller loads is, in the ViewDidLoad method I put this code:
pickerView.frame=CGRectMake(0,450,320,261);
For the action of show button,
pickerView.frame=CGRectMake(0,200,320,261);
I have a hide button inside this UIView, in its action i have
pickerView.frame=CGRectMake(0,450,320,261);
SO, from what I expect when I run the application, the UIView pickerView should initially hide because of code in viewDidLoad, and show button should bring it on the screen.
My problem is show and hide button works fine, but every time I load this ViewController the View appears on screen by default. Help me hide this UIView when I load the viewController.
Simpley don't set the frame for picker view
i am posting a sample code it makes picker view hide and appear when tapping the button
i am using the property "hide"
hear is the sample code
- (void)viewDidLoad
{
[super viewDidLoad // Do any additional setup after loading the view, typically from a nib.
//as simple dont set frame.
// i am using xib from there i wired up picker view
self.myPickerView.hidden = YES; //just hide it whenever you dont use it.
}
- (IBAction)whenShowHideButtonTapped:(id)sender
{
//when button pressed just show it
if(self.myPickerView.hidden)
{
self.myPickerView.hidden = NO;
}
else
{
self.myPickerView.hidden = YES;
}
}
hope this helps .. :)
You could call the hide code in 'viewWillAppear:' like this:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self hidePicker];
}
Related
Please help! It seems to simple, but, sorry, I 'have' to ask, as it's not working. I have a main view with a UITableView. On swiping, am adding a subview which has a picker and a button. It works fine: I swipe & the subview appears in front of the main view, but when I click the picker or the button, nothing really happens in the subview; instead the components in the main view (which is beneath the subview) get called! Am saying this for sure, because, in the main view, I have a picture beneath the added-subview (tapping the picture opens a new view). Now, when I tap the picker in the subview (the picture is beneath it in the main view), the picture gets tapped & the new view opens up! How is this possible?
This is the subview (in Interface Builder)
Here's my code snippet:
In my MainViewController.m (viewCtrlrFilter is the subview added when the user swipes in the main view)):
....
self.viewCtrlrFilter = (ViewController_Filter *) [myStoryboard instantiateViewControllerWithIdentifier:kNameViewCtrlrFilter];
...
// This is called when the user pans/swipes
// This does work fine; the subview gets added & is visible
[self.viewCtrlrFilter initializeView];
[self.viewCtrlr.view setFrame:CGRectMake(310.0, 220.0, 243.0, 208.0)];
[self.view addSubview:self.viewCtrlrFilter.view];
...
From ViewController_Filter.h :
...
// This implements the Picker Delegate & DataSource
// which I have wired to the picker in IB
#interface ViewController_FilterPhotographers : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>
...
// This is called when the button in the subview
// (screenshot above) is pressed
// It's wired through the IB
-(IBAction) buttonPressed:(id) sender;
...
From ViewController_Filter.m :
-(void) initializeView {
self.myPicker.delegate = self;
self.myPicker.dataSource = self;
self.myPicker.showsSelectionIndicator = YES;
CGRect rect = self.myPicker.frame;
rect.origin = CGPointMake(0.0, 0.0);
self.myPicker.frame = rect;
self.myPicker.transform = CGAffineTransformMakeScale(0.625,0.625);
[self.myPicker becomeFirstResponder];
}
...
-(IBAction) buttonPressed:(id) sender {
NSLog(#"hi");
}
...
- (void)viewDidLoad
{
[super viewDidLoad];
[self initializeView];
}
...
When the user swipes, the subview does get added (the picker & button are seen), but when I click the button, the IBAction method isn't getting called. Instead, funnily, the component in the main view (beneath the subview) is getting called!
It works now! Looks like setting the datasource & delegate for the picker view from both the code & IB was a problem. I set it from IB & removed it from code. It works fine now!
viewWillAppear is called both when going to the view and when coming back to the view from other views.
I want to select(highlight) and fade-out a cell only when coming back from other views.
Is there a delegate method to do this?
I'm using UINavigationViewController.
If you're on iOS 5, you can use these new properties:
These four methods can be used in a view controller's appearance
callbacks to determine if it is being presented, dismissed, or added
or removed as a child view controller. For example, a view controller
can check if it is disappearing because it was dismissed or popped
by asking itself in its viewWillDisappear: method by checking the
expression ([self isDismissing] || [self
isMovingFromParentViewController]).
- (BOOL)isBeingPresented __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (BOOL)isBeingDismissed __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (BOOL)isMovingToParentViewController __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
- (BOOL)isMovingFromParentViewController __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
In your code:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
if (!(self.isMovingToParentViewController || self.isBeingPresented))
{
// animate
}
}
EDIT:
If you're using a UITableViewController, setting the property -clearsSelectionOnViewWillAppear to YES will do this for you. You only have to do it manually if you're using a regular UIViewController with a UITableView subview.
If you are targeting iOS 5, you can use [self isBeingPresented] and [self isBeingDismissed] to determine if the view controller is being added or removed from the nav controller.
I'm also suspecting that you could improve the logic of when you select/deselect the cell in your table view such that it doesn't matter whether the view controller is coming or going.
The usual way to do it is this: when someone selects a row in the table view in view controller A, it gets selected/highlighted and you push a new view controller B. When view controller B is dismissed, you animate the deselection of the table view row in viewDidAppear (so the user can see it fading out) in view controller A. You wouldn't worry about whether view controller A has just appeared or is re-appearing, because there would only be a selected table view cell in the appropriate case.
viewWillAppear is getting called when the view appears
after the viewDidLoad
after you dismiss or pull a view controller
You could change the viewWillAppear to the following
- (void) viewWillAppear:(BOOL)animated
{
static BOOL firstTime = YES;
if (!firstTime)
{
//Do your alpha animation
}
firstTime = NO;
}
In your UINav Controller you could create a "lastView" property and have each of your view controllers (that are controlled by your UINav Controller) set this property on "viewWillAppear"... in your target view... the one you want to do the highlighting and fading you could check this property of the UINav Controller and see if it's NIL or not.
That's just one way to do it. This wouldn't work if you pop up a modal or the like.
In my Main Window IB file I have a TabBarController and the first controller is a Navigation Controller. When I push my detail view (after pressing a cell in a table view) I want to push my detail view and display a tool bar instead of the tab bar. The problem is that when I try
tabBar.hidden = visible;
in my detail view controller (viewDidLoad) the tabbar dissapears before the animation between the first view and the detail view is done.
What i want to achieve can be seen in the native photo app when pressing on one of the images from a gallery. There the tabbar moves out with the animation of the first view.
How do I achieve this?
Thanks in advance
check out the 'hidesBottomBarWhenPushed' property on your detail's page subclass of UIViewController
either override this method
- (BOOL)hidesBottomBarWhenPushed
{
return YES;
}
or i'm guessing this would work the same:
self.hidesBottomBarWhenPushed = YES;
as far as showing the toolbar try:
- (void)viewWillAppear:(BOOL)animated
{
[self.navigationController setToolbarHidden:NO animated:YES];
}
and on the way out
- (void)viewWillDisappear:(BOOL)animated
{
[self.navigationController setToolbarHidden:YES animated:YES];
}
So I have a modal view displaying in my app that has a little info for the user to fill out. The problem is that when the device is rotated, some animation occurs, but only in the frame. The form itself does not rotate. All the autorotate options are set to YES. I am displaying it when the user clicks on a field in a popover. This makes me suspect it has something to do with that but I am not sure. It is bizzare because if the device is in either view and then the modal window is displayed, it is fine. It only happens when the device is rotated in the modal view. Does anyone have any idea what may be causing this behavior when the device is rotated? Thanks!
Here is a snippet that is handled in the popover view controller:
if (currentLevel == 1 && businessOrLocation == 0){
if(tbsViewController == nil)
tbsViewController = [[BusinessFilteredViewController alloc] initWithNibName:#"BusinessFilteredView" bundle:[NSBundle mainBundle]];
NSMutableArray *tempBusiness = [[NSMutableArray alloc] init];
for (id theKey in appDelegate.groupedBusiness) {
NSMutableArray *tempArr = [appDelegate.groupedBusiness objectForKey:theKey];
[tempBusiness addObject:tempArr];
}
tbsViewController.businessOrLocation = businessOrLocation;
tbsViewController.modalPresentationStyle = UIModalPresentationFullScreen;
tbsViewController.modalTransitionStyle = UIModalPresentationFullScreen;
[self presentModalViewController:tbsViewController animated:YES];
}
I ran into this problem as well. The fundamental problem is that popover controllers cannot present modal views—it seems that case wasn’t properly considered or designed for. In my situation, it was easy enough to work around. I just extended the delegate protocol for my popover-hosted view controller. The main view sets itself up as the delegate to the popover view, and takes responsibility for displaying and dismissing the modal views the user requests from within the popover.
Since I already had a delegate protocol to cleanly dismiss the popover view when the user clicks “done” it was only a small stretch to get autorotation working the way I wanted it to. Here are some snippets:
#protocol InfoViewControllerDelegate <NSObject>
#optional
// Implement this to close the info view once the user clicks done.
- (void)infoViewDidFinish:(InfoViewController *)view;
// Implement this method if the delegate launched us as a popup view and must therefore
// take responsibility for diplaying help.
- (void)infoViewDidRequestHelp:(InfoViewController *)view;
#end
And in my main iPad view which presents this popup view:
#pragma mark - InfoViewControllerDelegate methods
- (void)infoViewDidFinish:(InfoViewController *)view {
[self hideInfo:self];
}
- (void)infoViewDidRequestHelp:(InfoViewController *)view {
[self hideInfo:self]; // Close the info view first
HelpViewController *help = [[HelpViewController alloc] init];
help.delegate = self;
[self presentModalViewController:help animated:YES];
[help release];
}
To make life simple for cases where I am launching the info view outside of a popup view (for example, on the iPhone, it is a simple modal view), it checks to see if the delegate handles the modal subviews, and if not, handles them itself. That way I didn’t need to change the iPhone base controller at all, since autorotation already worked fine there. Here’s the “Help” button action in the info view controller, showing how I did that:
- (IBAction)help:(id)sender {
if ([delegate respondsToSelector:#selector(infoViewDidRequestHelp:)]) {
[delegate infoViewDidRequestHelp:self];
} else {
HelpViewController *help = [[HelpViewController alloc] init];
help.delegate = self;
[self presentModalViewController:help animated:YES];
[help release];
}
}
With this code in place, my entire interface autorotates smoothly on both devices, whether or not popup views were involved.
Just so i understand correctly... You are displaying a popover and inside that popover if the user taps a certain element then you are displaying a full screen modal view controller? Vie never tried that before and it seems odd for two reasons.
First it seems jarring to the user in my opinion. The popover gives you a nice, integrated UI and the modal takes you away.
More importantly though, your popover view controller doesn't really have authority over the whole screen so presenting a full screen modal from a popover just seems inherently wrong.
I would suggest you display a nav controller in the popover controller and instead of presenting the new view controller modally over the whole screen just push it on to the nav controller in the popover and keep the user inside the popover.
If that doesn't really work for you, then I would suggest reviewing your UI needs and redesigning the layout.
I am guessing that you implemented - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation in BusinessFilteredViewController and returns YES
Could you check that you add more than 1 subviews to application window . If so, try to create container UIViewController for all viewControllers that you want to add to window.
I have seen the post for How to switch views by buttons on iPhone? but this doesn't answer how to switch back and forth between views with buttons. The person that asked the question settled on the answer that they could switch between views with uinavigationcontroller.
I put the following code in an ibaction that kicks off when a button is pressed in the primary view.
PhoneNumberViewController *phoneNumberViewController1 = [[PhoneNumberViewController alloc] initWithNibName:#"PhoneNumberView2" bundle:nil];
self.phoneNumberViewController = phoneNumberViewController1;
[self.view removeFromSuperview];
[self.view insertSubview: phoneNumberViewController1.view atIndex:0];
When this code executes the whole view just goes blank. If I omit the removefromsuperview portion then the view disappears behind my button but the button still remains. I'm not sure if this is the right way to switch between buttons but if anyone knows how to do this please help. Also if anyone knows about any example projects that switch between views with buttons let me know.
Thanks a million!
You removed the view controller's view from it's superview and then added a subview to it. The view hierarchy is broken at the view controller's superview (likely your window). That is why you are getting a blank screen.
You'd likely want to keep a reference around to the original view and then swap it out to the new view by setting the view controller's view to the new view.
// origView is an instance variable/IBOutlet to your original view.
- (IBAction)switchToPhoneView:(id)sender {
if (origView == nil)
origView = self.view;
self.view = phoneViewController.view;
}
- (IBAction)switchToOriginalView:(id)sender {
self.view = origView;
}
The technique I usually use involves creating a superview class which contains a toolbar at the bottom, and a content view UIView class filling the rest of the screen.
I then add subviews to the content view to change the views based on button clicks. This approach makes it so the toolbar on the same is constant across all views. I start by defining a helper function like this:
-(void) clearContentView {
//helper to clear content view
for (UIView *view in [self.contentView subviews]){
[view removeFromSuperview];
}
}
My IBAction then looks like this:
-(IBAction) buttonClicked{
self.title = #"Images"; //change title of view
[self clearContentView]; //clear content view
[self.contentView addSubview:self.imagesViewController.view]; //add new view
[self.imagesViewController viewWillAppear:YES]; //make sure new view is updated
[self enableButtons]; //enable all other buttons on toolbar
self.imagesButton.enabled = NO; //disable currently selected button
}