I'm calling the following code fragment to swap a view.(on top of screen, there's a UISegmentedControl to switch views)
SomeViewController* vc = [[SomeViewController alloc] init];
self.view = vc.view;
When user can switch back to original view by clicking the first button on the UISegmentedControl.
How should I recreate the view?
just for an example and for one idea if you use this bellow logic then its very easy to fullfil your requirement..
add as a subview of your self.view in viewDidLoad: method and hide it...
- (IBAction)segmentedControlChangedValue:(id)sender{
if (segmentedControl.selectedIndex == 0) {
vc.hidden = YES;
}
else if (segmentedControl.selectedIndex == 1) {
vc.hidden = NO;
[self.view bringSubviewToFront:vc];
}
}
Related
I am coding in xCode 4.3
This is my first application.
I have a UIViewController, company logo on top, then search bar and then UITableView in the middle (with product names) and bottom footer image. Now I want that once an item is clicked on UITableView, only TableView is replace with a view showing product details.
Right now I can replace the entire view with following code:
if (!self.prodDetailViewController_)
{
self.prodDetailViewController_ = [[PCS1ProdDetailViewController alloc] initWithNibName:#"PCS1ProdDetailViewController" bundle:[NSBundle mainBundle]];
}
[self presentModalViewController:prodDetailViewController_ animated:YES];
But it just increases my work, because I will have to redo the top bar and bottom bar (which remains same in entire application) in all my views.
Is there a way that I just change the element of my main UIViewController to UITableView.
Thanking you in anticipation.
I'm going to assume you're able to use iOS 5 features here. What you can do is implement a container view controller - much like UINavigationController, but with your own view layout so you can keep logo, search bar, etc. all in place and only transition between views in a part of your view.
I created a new container view controller named ViewController. It has a UIView outlet containerView which is set up in the .xib file, along with a top bar, search bar, and bottom bar (corresponding to the other views you describe in your application). It also has properties tableViewController and detailViewController. In its viewDidLoad implementation, it adds a TableViewController instance as a child view controller. When the table view is tapped, the view controller adds a DetailViewController instance as a child view controller and transitions to it. Tapping a button on the detail view transitions back to the table view, and removes the detail view controller as a child.
Here's my viewDidLoad method:
- (void)viewDidLoad
{
[super viewDidLoad];
self.tableViewController = [[TableViewController alloc] init];
self.tableViewController.delegate = self; // I implement a protocol TableViewControllerDelegate to know when row is tapped
// Fix for origin being 20 by default.
CGRect frame = self.tableViewController.view.frame;
frame.origin.y = 0.0f;
self.tableViewController.view.frame = frame;
[self addChildViewController:self.tableViewController];
[self.containerView addSubview:self.tableViewController.view];
[self.tableViewController didMoveToParentViewController:self];
}
I have a delegate method so that the container knows when a table row is tapped, and does the transition between the table view and the detail view. Its implementation follows:
- (void)tableViewController:(TableViewController *)tvc didSelectIndex:(NSInteger)index
{
self.detailViewController = [[DetailViewController alloc] init];
self.detailViewController.backButtonBlock = [self backButtonBlock]; // This block handles the transiton from detail back to table
CGRect detailStartingFrame = self.detailViewController.view.frame;
detailStartingFrame.origin.x = self.containerView.frame.size.width;
self.detailViewController.view.frame = detailStartingFrame;
[self addChildViewController:self.detailViewController];
[self transitionFromViewController:self.tableViewController
toViewController:self.detailViewController
duration:0.5
options:0
animations:^{
CGRect newTableFrame = self.tableViewController.view.frame;
newTableFrame.origin.x = (-1.0f * newTableFrame.size.width);
self.tableViewController.view.frame = newTableFrame;
[self.containerView addSubview:self.detailViewController.view];
CGRect newDetailFrame = self.detailViewController.view.frame;
newDetailFrame.origin.x = 0.0f;
self.detailViewController.view.frame = newDetailFrame;
} completion:^(BOOL finished) {
[self.detailViewController didMoveToParentViewController:self];
}];
}
As mentioned above, the detail view executes a block when tapping on a back button. I create this block in ViewController here:
- (GoBackButtonBlock)backButtonBlock
{
GoBackButtonBlock block = ^ {
[self.detailViewController willMoveToParentViewController:nil];
[self transitionFromViewController:self.detailViewController toViewController:self.tableViewController duration:0.5 options:0 animations:^{
CGRect newDetailFrame = self.detailViewController.view.frame;
newDetailFrame.origin.x = self.containerView.frame.size.width;
self.detailViewController.view.frame = newDetailFrame;
CGRect newTableFrame = self.tableViewController.view.frame;
newTableFrame.origin.x = 0.0f;
self.tableViewController.view.frame = newTableFrame;
} completion:^(BOOL finished) {
[self.detailViewController removeFromParentViewController];
[self.detailViewController.view removeFromSuperview];
}];
};
return [block copy];
}
That's about all there is to it. Be sure to read the "Implementing a Container View Controller" section of the UIViewController class reference for more details. Hope this helps!
Prepare all of your detail in a View, then add this view to the current screen. That's that.
in your "tableViewDidSelectRowAtIndex" method,On selection of row,just show the particular custom view (which contains details of selected row),and at that same time hide the table view,so u can have the view that u want. And make a back button on that custom view,and on that button action,hide your current view and show the tableview again.
i like to create a second starting screen in my app.
My Idea is to use the default.png and load an UIView with an fullscreen UIImageView inside.
In viewDidLoad i thought about placing a sleep option and after this load the real app screen.
But also when my function is called in viewDidLoad, nothing happens.
Seems my superview is empty...
Here is a piece of code:
if (self._pdfview == nil)
{
pdfview *videc = [[pdfview alloc]
initWithNibName:#"pdfview" bundle:nil];
self._pdfview = videc;
[pdfview release];
}
// get the view that's currently showing
UIView *currentView = self.view;
// get the the underlying UIWindow, or the view containing the current view
UIView *theWindow = [currentView superview];
theWindow is empty after this line so that might be the reason why the other view is not loaded.
So my question, how do i create a second starting screen ?
Or three starting screens, like in games when i like to mention another company.
If I understand correctly, your point is that when your function above is executed from viewDidLoad of some controller, theWindow is nil, so your new view (startscreen) is not added to it.
A few observations:
if theWindow is nil, then self.view is the topmost UIView; you can try and replace it, or simply add your view to it:
UIView *currentView = self.view;
// get the the underlying UIWindow, or the view containing the current view
UIView *theWindow = [currentView superview];
UIView *newView = _pdfview.view;
if (theWindow) {
[currentView removeFromSuperview];
[theWindow addSubview:newView];
} else {
self.view = newView; //-- or: [self.view addSubview:newView];
}
if you want to get the UIWindow of your app (which seems what you are trying to do), you can do:
[UIApplication sharedApplication].keyWindow;
and from there you can either set the rootViewController (from iOS 4.0)
[UIApplication sharedApplication].keyWindow.rootViewController = ...;
or add newView as a subview to it:
[[UIApplication sharedApplication].keyWindow addSubview:newView];
in the second case, you should possibly remove all subviews previously added to the UIWindow. (Iterate on keyWindow.subviews and call removeFromSuperview).
OLD ANSWER:
I think that you should try and add your pdfview as a subview to the current view:
[currentView addSubview:videc];
or to what you call theWindow:
[theWindow addSubview:pvidec];
and, please, move the release statement after the `addSubview, otherwise the view will be deallocated immediately.
I'm looking through an example in the iPhone Beginning programming book and they have code to switch between two views when a button is pressed. Here's the first snippet from their example code:
if (self.yellowViewController.view.superview == nil)
{
if (self.yellowViewController == nil)
{
YellowViewController *yellowController =
[[YellowViewController alloc] initWithNibName:#"YellowView"
bundle:nil];
self.yellowViewController = yellowController;
[yellowController release];
}
[blueViewController.view removeFromSuperview];
[self.view insertSubview:yellowViewController.view atIndex:0];
}
else
{
if (self.blueViewController == nil)
{
BlueViewController *blueController =
[[BlueViewController alloc] initWithNibName:#"BlueView"
bundle:nil];
self.blueViewController = blueController;
[blueController release];
}
[yellowViewController.view removeFromSuperview];
[self.view insertSubview:blueViewController.view atIndex:0];
}
It does make sense to me, but the question I have is, how would you do this with a UISegmentControl that has four views. I know you can check for the selectedSegment and create that view when needed. But how would I know what the last view was in order to remove it from the superview beforing adding my new view as a subview? Thanks!
while creating each view either code or IB set tag value to segmentIndex.so u can get them later by that tag value.this is tricky and simple.
You could check to see which view is allocated or not nil and then remove.
if (yellowController) {
[yellowController.view removeFromSuperView];
[yellowController release];
}
You could go through your four views to determine which one is loaded and then remove the view.
For any UIView the frontmost subview is [[myView subviews] lastObject].
hours ago I post a question on organizing portrait and landscape mode in iPhone and now I think I know how to do it using willRotateToInterfaceOrientation:duration.
The first screen is 'Map View' with one button that leads to 'Setting View'. The Map View does not support rotate but for the Setting View I made separate view for portrait and landscape and they swap accordingly when rotated.
, ,
As you can see when Setting button pressed SettingView is added on the view stack as usual. So basically I use three view controllers; Setting, SettingLandscape and SettingPortrait.
I still found problem in rotating view in iPhone when I use navigationViewController. Segmented control is not working. it crashes without error message. It used to working fine without rotation.- when I'm not using multiple view for rotation-.
rotateViewController.m
This is root view controller.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
-(IBAction) buttonPressed{
Setting *settingViewController = [[Setting alloc] initWithNibName:#"Setting" bundle:[NSBundle mainBundle]];
UINavigationController *navController1 = [[UINavigationController alloc] initWithRootViewController: settingViewController];
[self.navigationController presentModalViewController:navController1 animated:YES];
[settingViewController release];
[navController1 release];
}
Setting.m
This view controller does nothing but swap views when rotate and shows appropriate view between portrait and landscape.
In Setting.m, I swap view as follow;
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation==UIInterfaceOrientationLandscapeRight) {
NSLog(#"to Right");
SettingLandscape *setting_landscape = [[SettingLandscape alloc] initWithNibName:#"SettingLandscape" bundle:[NSBundle mainBundle]];
self.view = setting_landscape.view;
[setting_landscape release];
}
if (toInterfaceOrientation==UIInterfaceOrientationLandscapeLeft) {
NSLog(#"to Left");
SettingLandscape *setting_landscape = [[SettingLandscape alloc] initWithNibName:#"SettingLandscape" bundle:[NSBundle mainBundle]];
self.view = setting_landscape.view;
[setting_landscape release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortrait) {
NSLog(#"to Portrait");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
NSLog(#"to PortraitUpsideDown");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
}
In viewWillAppear, Setting view controller also has ;
self.title = #"Shell ";
self.navigationController.navigationBarHidden = NO;
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStylePlain target:self action:#selector(Done)] autorelease];
and Done is
- (void) Done{
[self dismissModalViewControllerAnimated:YES];
}
SettingLandscape.m
This view stacked on when the view is rotated. This view controller has it's navigation bar.
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.title = #"Setting Landscape";
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
in viewDidLoad;
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(#"landscape:viewDidLoad");
//self.title = #"SettingLandscape";//not working!!
//self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Done1" style:UIBarButtonItemStylePlain target:self action:#selector(Done)] autorelease];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
stringflag4MapType = [[NSString alloc] initWithString:#"blah"];
stringflag4MapType = [defaults stringForKey:#"flag4MapType"];
if (![stringflag4MapType isEqualToString:#"Hybrid"] && ![stringflag4MapType isEqualToString:#"Standard"] && ![stringflag4MapType isEqualToString:#"Satellite"]) {
segmentedControl4MapType.selectedSegmentIndex = 0;
}else if ([self.stringflag4MapType isEqualToString:#"Standard"]) {
segmentedControl4MapType.selectedSegmentIndex = 0;
}else if ([self.stringflag4MapType isEqualToString:#"Satellite"]) {
segmentedControl4MapType.selectedSegmentIndex = 1;
}else if ([self.stringflag4MapType isEqualToString:#"Hybrid"]) {
segmentedControl4MapType.selectedSegmentIndex = 2;
}
and following call does not get invoked. strange. doesn't matter rotation works anyway.
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation==UIInterfaceOrientationPortrait) {
NSLog(#"to Portrait");// does not print out.
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
NSLog(#"to PortraitUpsideDown");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
}
ok now, as you can see from those snap shots there are two navigation bar and each has its bar button, Done and Item. The Done button came from Setting and the Item button from SettingPortrait or SettingLandscape. All button's selector is same, that leads back to map view. The button Done works fine, but the button Item crashes. I need a button on navigation bar after rotation that acts like back button . I guess once I did 'self.view = settingportrait.view;' the problem starts.
The reason why I need the Item button work is that the segmented control started crashing once I add code to support rotation. If I found reason how to make the Item button-that is inside rotation view- work I think I can make the segmented control work as well.
You can download the whole code at https://github.com/downloads/bicbac/rotation-test/rotate-1.zip
https://github.com/downloads/bicbac/rotation-test/rotate-1.zip
this sample code is amazing for me. It solve my problem of rotating view just by simple delegate method
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
my best attempt to answer question without looking at code (don't have time tonight :( )
When you present setting viewcontroller modally, your top viewcontroller is setting.
When rotation happens, you load setting_landscape or setting_portrait viewcontroller, but only retain the view inside setting_landscape|portrait. Thus, setting_landscape/portrait viewcontrollers are released. When device is rotated, it's probably "setting" viewcontroller receiving rotation message, not the "setting_landscape/portrait" viewcontroller because they are not pushed on to the viewcontroller stack.
So, when you click on item or segment control, it will call delegate, which is probably set to setting_landscape|portrait which is released already.
What is the message in console you get with crash?
My recommendation would be to build setting viewcontroller with segmented control, then use "willAnimateRotationToInterfaceOrientation:duration:" function to reposition the segmented control to the right position and frame. Just by returning YES to all orientation, rotation should be supported, doesn't it?
What was the reason for using two separate viewcontroller for landscape/portrait? (I do this sometimes, but rarely)
Edit* you need to use "willAnimateRotationToInterfaceOrientation" callback to animate the changes, not "willRotate..."
I have a root view controller which has few buttons. On click of these button, I shown up a tab bar controller with each controller showing the table view controller. I have achieved this. So basically, for each table view controller I have a dedicated class. To go ahead, I replaced the tab bar controller, and added the segmented controller to the navigation title view.
The question is how can I set the view based on the selected index. I am able to set the navigation title to be segmented control but on select I am unable to set the view.
Below is what i have achieved so far.
Note: What matters is a running code, I would do that code optimization later on. I dont want to hidde views. I want to call different view controller class.
RootViewController class (on click of the button, i call the first view controller. So that I can set the segment controller:
-(IBAction) pushSegmentController: (id) sender
{
NSLog(#"My Location Button being clicked/touched") ;
FirstViewController *firstViewController = [[FirstViewController alloc] init] ;
[self.navigationController pushViewController:firstViewController animated:YES];
// Releae the view controllers
[firstViewController release];
}
IN FirstViewController class:
-(void)viewDidLoad {
[super viewDidLoad];
NSArray *viewControllers = [self segmentViewControllers];
self.segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:#"Table1", #"Table2"]];
self.navigationItem.titleView = segmentedControl;
[self.segmentedControl addTarget:self
action:#selector(indexDidChangeForSegmentedControl:)
forControlEvents:UIControlEventValueChanged];
self.segmentedControl.selectedSegmentIndex = 0;
}
-(void)indexDidChangeForSegmentedControl:(UISegmentedControl *)aSegmentedControl {
NSUInteger index = aSegmentedControl.selectedSegmentIndex;
if(index ==0) {
UIViewController *table1Controller = [[AustraliaViewController alloc] initWithStyle:UITableViewStylePlain];
**???? HOW SHOULD I SET THE VIEW OVER HERE... AS ITS A PART OF THE NAVIGATION CONTROLLER**
}
else { }
}
Note: I have tried using this option:
[navigationController setViewControllers:theViewControllers animated:NO];
But this option doesnt give me the right result. How should I go ahead with the same as I want to call a view controller class and set its view based on the selected index.
You probably don't want to have one view controller with different views depending on the button index, especially since you already have view controllers for your different screens.
If you want the table view controller to be pushed onto your navigation controller, so it will have a back button that gets you back to FirstViewController, use
-(void)indexDidChangeForSegmentedControl:(UISegmentedControl *)aSegmentedControl {
NSUInteger index = aSegmentedControl.selectedSegmentIndex;
UIViewController *newViewController = nil;
if(index ==0) {
newViewController = [[AustraliaViewController alloc] initWithStyle:UITableViewStylePlain];
} else {
newViewController = [[YourOtherViewController alloc] initWithStyle:UITableViewStylePlain];
}
[self.navigationController pushViewController:newViewController animated:YES];
}
If you'd rather have it slide in from the bottom and you want to handle setting up all necessary user interface (e.g. a dismiss button), replace that last line with
[self presentModalViewController:newViewController animated:YES];
What about?
self.view = table1Controller;
or
[self.view addSubview:table1Controller];
I just saw one more mistake you have done. You are allocating a UIViewController, but initializing it like a tableViewController(with initWithStyle).
If it's a subclass of UITableViewController, alloc it with that, not UIViewController.