I have a custom UIWebView written like this :
.h
#interface MiniWebViewController : UIViewController {
NSString* destinationURL;
UIWebView* webView;
UIActivityIndicatorView* activityIndicatorView;
}
#property (nonatomic, retain) NSString* destinationURL;
#property (nonatomic, retain) IBOutlet UIWebView* webView;
#property (nonatomic, retain) IBOutlet UIActivityIndicatorView* activityIndicatorView;
- (void) run;
#end
.m
#synthesize destinationURL;
#synthesize webView;
#synthesize activityIndicatorView;
- (id) initWithFrame:(CGRect)frame {
if (self = [super initWithNibName:#"MiniWebView" bundle:nil]) {
self.destinationURL = #"";
self.view.frame = frame;
self.activityIndicatorView.center = self.webView.center;
}
return self;
}
- (void) run {
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.destinationURL]]];
}
It is called an initied from another ViewController :
- (void) aFunction {
MiniWebViewController* oneViewController = [[MiniWebViewController alloc] initWithFrame:CGRectMake(/*Some Rect*/];
oneViewController.webView.tag = i;
oneViewController.destinationURL = /*SomeURL*/;
oneViewController.webView.delegate = self;
[self.view addSubview:oneViewController.view]; /* the Web view is inside this one */
[oneViewController run];
}
- (void) webViewDidFinishLoad:(UIWebView *)webView {
int webViewID = webView.tag;
MiniWebViewController* webViewController = [self.webViews objectAtIndex:webViewID];
[webViewController.activityIndicatorView stopAnimating];
}
- (void)webViewDidStartLoad:(UIWebView *)webView {
int webViewID = webView.tag;
MiniWebViewController* webViewController = [self.webViews objectAtIndex:webViewID];
[webViewController.activityIndicatorView startAnimating];
}
Into IB hidesWhenStopped is also checked. Everything is linked. The style of the indicator is set to "Large White" into IB.
When running, the indicator is not large, but small.
It is successfully started and stopped (delegate calls are triggered), but it doesn't hide when stopped.
What's the problem ? I don't see...
After a careful look in your code, you are modifying the UIActivityView in your init method. Change those so that they are in your viewDidLoad. At init, you view is not yet loaded, therefore, there is not an instance of those objects yet created in your controller.
These are the statement that need to be moved:
self.activityIndicatorView.hidesWhenStopped = YES;
self.view.frame = frame;
self.activityIndicatorView.center = self.webView.center;
This goes back to a fundamental of Objective-C: Sending a message to a nil object...returns nil. This is an annoying feature at times because there is no compile time warning, nor is there any runtime exception--a feature of the language.
Stupid I am, and XCode/cocoa really doesn't help.
I had loaded a wrong XIB name that DOES NOT exist.
So I ask to load something that does not exist, and the app stil works, even showing and using objects that does not exist. Untill one call does not work as expected. No crash...
It's nonsense.
Related
I need to view a subview with an activity indicator.
This is my code but the subview doesn't appear:
#interface ProgressViewController : UIViewController {
IBOutlet UIActivityIndicatorView *myActivityIndicator;
}
#property (nonatomic, retain) IBOutlet UIActivityIndicatorView *myActivityIndicator;
#end
#implementation ProgressViewController
#synthesize myActivityIndicator;
- (void)viewDidLoad {
[myActivityIndicator startAnimating];
[super viewDidLoad];
}
- (void)viewWillDisappear:(BOOL)animated {
[myActivityIndicator stopAnimating];
}
#end
#import "ProgressViewController.h"
#interface MyViewController : UIViewController {
ProgressViewController *progressViewController;
}
#property (nonatomic, retain) ProgressViewController *progressViewController;
#end
#implementation MyViewController
#synthesize progressViewController
- (void)viewDidLoad
{
progressViewController = [[ProgressViewController alloc] initWithNibName:#"ProgressViewController" bundle:nil];
[self.view addSubview:progressViewController.view];
sleep(4);
[progressViewController.view removeFromSuperview];
[super viewDidLoad];
}
#end
There could be several causes, and it's still a bit unclear from the code you sent, which one it is.
First, you shouldn't use sleep(4) in your code - it messes up the application engine iOS runs to support user input, screen refresh, etc.
Your code could easily be changed to:
[self performSelector:#selector(removeMyProgressView:) withObject:progressViewController.view afterDelay:4.0];
and have removeFromSuperview in your removeMyProgressView: function.
Also, this line of code is buggy:
progressViewController = [[ProgressViewController alloc] initWithNibName:#"ProgressViewController" bundle:nil];
It should be
self.progressViewController = [[ProgressViewController alloc] initWithNibName:#"ProgressViewController" bundle:nil];
Otherwise you don't call the setter function (#sythesized property), and the object isn't retained. It could be that it is released, and therefore you don't see it.
If this none of this is right, we'll keep pounding at it :)
Good luck!
Oded.
Everything in your -viewDidLoad method happens in one runloop. This means that you add and remove the activity indicator without giving the system a chance to actually draw it. The 4 seconds of sleep don't help. Those just make the runloop take longer to finish.
call [super viewDidLoad] before anything in - (void)viewDidLoad methods
I'm new to Objective C and I'm having trouble getting delegates to work in my code.
I have a class called cViewController and in this class has a UIWebView to fetch webpages and a button above it that calls a popover class called prodMenu. What I'm having trouble with is that the function to call webpages from the prodMenu class and display it on the parent UIWebView isn't working.
cViewController.h
#import <UIKit/UIKit.h>
#import "prodMenu.h"
#interface cViewController : UIViewController <prodMenuDelegate>{
UIPopoverController *cpopover;
IBOutlet UIWebView *webImageDisplay;
}
#property (nonatomic, retain) UIWebView *webImageDisplay;
#property (nonatomic, retain) UIPopoverController *cpopover;
- (IBAction)cPopoverTapped:(id)sender;
- (void) fetchWebsite:(NSString *)website; //This is the delegate method I'm trying to call in the popover class.
#end
cViewController.m
- (IBAction)cPopoverTapped:(id)sender {
prodMenu *tp = [[prodMenu alloc] init];
cpopover = [[UIPopoverController alloc] initWithContentViewController:tp];
[tp release];
CGRect rect = CGRectMake(40, 0, 50, 50);
cpopover.popoverContentSize = CGSizeMake(250, 225);
[cpopover presentPopoverFromRect:rect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
- (void)fetchWebsite:(NSString*)website{ //This function is called by prodMenu class
NSLog(#"address: %#", website);
NSString *urlAddress = website;
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webImageDisplay loadRequest:requestObj];
[webImageDisplay release];
}
- (void)viewDidLoad {
[self fetchWebsite:#"http://www.yahoo.com"];
[super viewDidLoad];
}
prodMenu.h
#import <UIKit/UIKit.h>
#protocol prodMenuDelegate;
#interface prodMenu : UIViewController{
<prodMenuDelegate> delegate;
}
- (IBAction)radBtn:(id)sender; //This is the IBAction that calls the fetchWebsite function
#property (nonatomic, assign) id <prodMenuDelegate> delegate;
#end
#protocol prodMenuDelegate
- (void)fetchWebsite:(NSString *)website;
#end
prodMenu.m
#import "prodMenu.h"
#import "cViewController.h"
#implementation prodMenu
#synthesize delegate;
- (IBAction)radBtn:(id)sender{
[delegate fetchWebsite:#"http://www.google.com"]; //Here is the call to the method
}
Am I missing something here to call the delegate method? There aren't any errors or warnings. All I want to do is when the user presses a button on the popover view, the parent class underneath changes the webpage. Thanks in advance.
Just a quick idea. Have you tried declaring the delegate protocol like this
#protocol prodMenuDelegate <NSObject>
...
#end
? I often ran into troubles when omitting the < NSObject >. Also I think there is an 'id' missing in
#interface prodMenu : UIViewController{
<prodMenuDelegate> delegate;
}
Edit: Also, in the code you posted I do not see where you actually assign the prodMenu's delegate.
I have three view controllers, one root controller, one login view controller and one customers view controller. I want to pass the entered username and password in login view controller to the customers view controller. My files and code is displayed below, could you please guide me, how can access to variables set in the login view controller? Or how can I pass variables to customers view controller?
I have these class files:
/classes/MySoftwareAppDelegate.h
/classes/MySoftwareAppDelegate.m
/classes/ViewController.h
/classes/ViewController.m
/classes/LoginController.h
/classes/LoginController.m
/classes/CustomersController.h
/classes/CustomersController.m
I have these views:
/resources/MainWindow.xib
/resources/Login.xib
/resources/Customers.xib
In the AppDelegate, I have successfully inserted the sub view "Login" and it's displayed whenever the app starts.
In the login view, I enter my username and password and then click the "Login" button. When this button is clicked, an IBAction is triggered. In this IBAction, I want to change the current subview with the Customers.
Here's the code I have used:
MySoftwareAppDelegate.h
#import <UIKit/UIKit.h>
#class ViewController;
#interface MySoftwareAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
ViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet ViewController *viewController;
#end
MySoftwareAppDelegate.m
#import "MySoftwareAppDelegate.h"
#import "ViewController.h"
#implementation MySoftwareAppDelegate
#synthesize window;
#synthesize viewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after application launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
ViewController.h
#import <UIKit/UIKit.h>
#class LoginController;
#interface ViewController : UIViewController {
LoginController *loginController;
}
#property (nonatomic, retain) LoginController *loginController;
#end
ViewController.m
#import "ViewController.h"
#import "LoginController.h"
#implementation ViewController
#synthesize loginController;
- (void)viewDidLoad {
LoginController *tmpViewController = [[LoginController alloc] initWithNibName:#"Login" bundle:nil];
self.loginController = tmpViewController;
[self.view insertSubview:loginController.view atIndex:0];
[tmpViewController release];
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
if (self.loginController.view.superview == nil) {
self.loginController = nil;
}
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[loginController release];
[super dealloc];
}
#end
LoginController.h
#import <UIKit/UIKit.h>
#class CustomersController;
#interface LoginController : UIViewController {
UIButton *loginButton;
UITextField *usernameTextField;
UITextField *passwordTextField;
NSMutableString *available_credits;
NSString *current_xml_element;
CustomersController *customersController;
}
#property (nonatomic, retain) IBOutlet UIButton *loginButton;
#property (nonatomic, retain) IBOutlet UITextField *usernameTextField;
#property (nonatomic, retain) IBOutlet UITextField *passwordTextField;
#property (nonatomic, retain) NSMutableString *available_credits;
#property (nonatomic, retain) NSString *current_xml_element;
#property (nonatomic, retain) CustomersController *customersController;
-(IBAction)textFieldDoneEditing:(id)sender;
-(IBAction)backgroundTap:(id)sender;
-(IBAction)loginToAccount:(id)sender;
#end
LoginController.m
#import "LoginController.h"
#import "CustomersController.h"
#implementation LoginController
#synthesize loginButton;
#synthesize usernameTextField;
#synthesize passwordTextField;
#synthesize customersController;
- (void)viewDidLoad {
UIImage *buttonImageNormal = [UIImage imageNamed:#"whiteButton.png"];
UIImage *stretchableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];
UIImage *buttonImagePressed = [UIImage imageNamed:#"blueButton.png"];
UIImage *stretchableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[loginButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal];
[loginButton setBackgroundImage:stretchableButtonImagePressed forState:UIControlStateHighlighted];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[usernameTextField release];
[passwordTextField release];
[super dealloc];
}
-(IBAction)textFieldDoneEditing:(id)sender {
[sender resignFirstResponder];
}
-(IBAction)backgroundTap:(id)sender {
[usernameTextField resignFirstResponder];
[passwordTextField resignFirstResponder];
}
-(IBAction)loginToAccount:(id)sender {
// bla bla bla... Login check process is done here
CustomersController *tmpViewController = [[CustomersController alloc] initWithNibName:#"Customers" bundle:nil];
self.customersController = tmpViewController;
[self presentModalViewController:tmpViewController animated:YES];
[self.view removeFromSuperview];
[tmpViewController release];
}
#end
As you can see above, in LoginController.m's loginToAccount method, I am checking the login info and then setting the new view controller for the "customers" sub-view.
Then I am removing the current "Login" subview from the super view but don't know how to add the new "Customers" sub view.
In MainWindow.xib, I have one view controller which is linked to ViewController class and it's the root contoller.
Any help is appreciated. Because I am new to Objective-C and iPhone programming, please do your best to explain considering a novice programmer :)
Thanks again.
Okay, let me answer my question. I just found the answer on StackOverFlow.com
In the view controller which is going to load the next view controller, just add these lines:
NextController *tmpViewController = [[NextController alloc] initWithNibName:#"NextView" bundle:nil];
tmpViewController.enteredUsername = usernameTextField.text;
tmpViewController.enteredPassword = passwordTextField.text;
I'd say that better way is to have separate class for storing globally needed data (and that would be compliant with MVC model).
For example you can store you login information in your MySoftwareAppDelegate, which is easily accessible with [[UIApplication sharedApplication] delegate] call from any part of your application.
It all depends on how serious the data you want to pass it. For a quick variable (maybe a settings change in a modal view controller) TamTam's solution makes the most sense. You alloc/init'ed it, you got the variable, why not access it properties? That same (modally presented) view controller might pass variables back via a delegate pattern.
If you're data needs to be system wide, you can use the singleton pattern. Using "[[UIApplication sharedApplication] delegate]" gets the application delegation (which is a singleton), and many people stuff their variables there for convenience. However, your app delegate wasn't designed for this, and so it's considered bad form. Create your own singleton if your apple isn't a quickie.
If you use a persistent data store like sql, plists or coredata, you can put your system wide data there.
I have an iPhone application that loads succesive views in a framework based on the one explained in this link (basically a main ViewController that loads/removes additional views with a displayView method). In my application I am using NIBs (the example link uses coded views) though so each of my ViewControllers has its accompanying nib.
Debugging in Instruments shows no leaks but if I enter/leave a section (ViewController with its View.xib), the nib remains in memory so after a few in/outs memory starts to accumulate.
I know the nib is not being unloaded because one is almost programmatically created (no stuff in IB) while another does have images and buttons created in IB. The large one is loaded first and the small one loads next. You would expect a reduction in allocation in Instruments.
How can I prevent this?
My structure is as follows, with a few comments below:
`MyAppDelegate.h`
#import <UIKit/UIKit.h>
#class RootViewController;
#interface MyAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
RootViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet RootViewController *viewController;
-(void) displayView:(int)intNewView;
#end
`MyAppDelegate.m`
#import "MyAppDelegate.h"
#import "RootViewController.h"
#implementation MyAppDelegate
#synthesize window;
#synthesize viewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[window addSubview:viewController.view];
[window makeKeyAndVisible];
return YES;
}
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {
}
-(void) displayView:(int)intNewView {
[viewController displayView:intNewView];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
This controller handles subview load/removes:
`RootViewController.h`
#import <UIKit/UIKit.h>
#interface RootViewController : UIViewController {
}
- (void) displayView:(int)intNewView;
#end
`RootViewController.m`
#import "RootViewController.h"
#import "ViewController.h"
#implementation RootViewController
UIViewController *currentView;
- (void) displayView:(int)intNewView {
NSLog(#"%i", intNewView);
[currentView.view removeFromSuperview];
[currentView release];
switch (intNewView) {
case 1:
currentView = [[ViewController alloc] initWithNibName:#"View" bundle:nil];
break;
}
[self.view addSubview:currentView.view];
}
- (void)viewDidLoad {
currentView = [[ViewController alloc]
initWithNibName:#"View" bundle:nil];
[self.view addSubview:currentView.view];
[super viewDidLoad];
}
- (void)dealloc {
[currentView release];
[super dealloc];
}
#end
There would be as many case as "detail" ViewControllers I have (right now I have 3 case but this will grow to 10 or more). The purpose of this structure is to easily move from one "section" of the application to another (NavBar controller or TabBar controller do not suit my specific needs).
`ViewController.h`
// Generic View Controller Example
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController {
UIImageView *_image1;
UIImageView *_image2;
NSTimer *_theTimer;
}
#property (nonatomic, retain) IBOutlet UIImageView *image1;
#property (nonatomic, retain) IBOutlet UIImageView *image2;
#property (nonatomic, retain) NSTimer *theTimer;
#end
`ViewController.m`
#import "ViewController.h"
#import "MyAppDelegate.h"
#synthesize image1 = _image1, image2 = _image2, theTimer = _theTimer;
- (void)loadMenu {
[self.theTimer invalidate];
self.theTimer = nil;
MyAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
[appDelegate displayView:2];
}
-(void)setView:(UIView*)aView {
if (!aView){
self.image1 = nil;
self.image2 = nil;
}
[super setView:aView];
}
- (void)viewDidLoad {
//some code
[super viewDidLoad];
}
- (void)viewDidUnload {
self.image1 = nil;
self.image2 = nil;
}
- (void)dealloc {
NSLog(#"dealloc called");
[self.theTimer invalidate];
[self.theTimer release];
[self.image1 release];
[self.image2 release];
[super dealloc];
}
Notice the NSLog in dealloc. This is being called (I can see it in the console) but the memory needed for the nib is not freed (Instruments shows an increase in memory allocation when leaving a section, because a new nib is loaded).
Any help will be greatly appreciated. I have tried a million different things and I cannot get the nibs to unload.
After a million different tries I finally ran into this forum.
It states:
Apparently images assigned in IB are loaded into image views using imageNamed. imageNamed caches the images in a way that makes them unloadable. You could load the images in viewDidLoad with initWithContentsOfFile and then assign them to the views.
Somewhere else I had read that imageNamed is the devil so I'd rather not have my images load that way.
(BTW this is iPhone OS 3.1 I'm using)
What I ended up is leaving the UIImageView intact in IB but with an empty .image value. The modified code is something like:
- (void)viewDidLoad {
NSString *path = [NSString stringWithFormat:#"%#/%#", [[NSBundle mainBundle] resourcePath], #"myImageThatBeforeWasAValueinIB.jpg"];
UIImage *image = [UIImage imageWithContentsOfFile:path];
outlet.image = image;
// do the rest of my stuff as it was
[super viewDidLoad];
}
- (void)dealloc {
outlet.image = nil;
[outlet release], outlet = nil;
[super dealloc];
}
And now everything works like a charm! Memory is recovered when I unload a nib and when I get memory warnings.
So pretty much if you have IBOutlets for UIImageViews and memory is a concern (it always is I guess), you can design all you want in IB and when the time comes to connect them to outlets, remove the image reference in IB and create it from code. IB is really good for laying out your app. It would suck to have to do all that thing by code, but I also found this nice utility that converts nibs to objective c code although I haven't tested it yet.
Did you try setting your outlet variables to nil in dealloc?
You are correctly implementing the setView method, but you are setting your outlet variables to nil in the viewDidUnload method instead of dealloc. As discussed here, you should implement dealloc as follows:
- (void)setView:(UIView *)aView {
if (!aView) { // view is being set to nil
// set outlets to nil, e.g.
self.anOutlet = nil;
}
// Invoke super's implementation last
[super setView:aView];
}
- (void)dealloc {
// release outlets and set outlet variables to nil
[anOutlet release], anOutlet = nil;
[super dealloc];
}
EDIT: if the outlets are UIImageViews, then it may be the case that you need to do
anOutlet.image = nil;
because setting the UIImage’s instance image property should increase the retain count of the UIImage’s instance by 1.
When the app is in one view controller, I want to add a view to simulate that data is being loaded when I click my tab bar controller to open another view controller.
Example: When I the app is in the recorder-view, I want it to show a loading view (a view with a activity indicator) when I change to the list of recorded files (which can take some time to load). I've tried manipulate this with the viewWillDisappear-event, but I can't get it to work - the view is not being added before after the viewDidAppear-event occurs.
Anyone have any thoughts regarding this?
Thanks
Thank you for your reply. I tried doing like tou suggested, but I still can't get it to show when I want. I try to set hidden = NO in my viewWillDisappear-event, but it does not show before that view controller disappears and the next one appears
Right now it sounds like you have a UITabBarController That takes up the whole screen. What I would do is put the loading view above the TabBarController and hide it when not necessary. I would create a subclass of loadingViewController in the same xib your tab bar controller came from (or programatically if you desire) and set it to an IBOutlet of the App Delegate.
Something like this:
//In your App Delegate
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:tabBarController.view];
loadingView.hidden = YES;
[window insertSubview:loadingViewController.view aboveSubview:abBarController.view];
[window makeKeyAndVisible];
}
//In your loading View Controller
- (void) setLoadingViewHidden:(BOOL)hidden {
self.view.hidden = hidden;
self.activityIndicator.animating = hidden;
}
The way I've done this in the past is to have a content view which houses either an activity view or the view proper.
In the view controller's nib, instead of adding subviews to the main view, leave it empty and create a new view (such as a table view in the example below) for the view proper.
Also create an activity view (with a threaded progress indicator or somesuch) and a "no results" view.
Then derive your controller class from the something like the following:
//
// ContainerViewController.h
//
#import <UIKit/UIKit.h>
#interface ContainerViewController : UIViewController
{
UIView *myContainerView;
UITableView *myTableView;
UIView *mySearchActivityView;
UIView *myZeroResultsView;
UIView *myCurrentlyShowingView;
}
#property (retain, nonatomic) IBOutlet UIView *containerView;
#property (retain, nonatomic) IBOutlet UITableView *tableView;
#property (retain, nonatomic) IBOutlet UIView *searchActivityView;
#property (retain, nonatomic) IBOutlet UIView *zeroResultsView;
#property (assign) UIView *currentlyShowingView;
#end
//
// ContainerViewController.m
//
#import "ContainerViewController.h"
#implementation ContainerViewController
#synthesize containerView = myContainerView;
#synthesize tableView = myTableView;
#synthesize searchActivityView = mySearchActivityView;
#synthesize zeroResultsView = myZeroResultsView;
- (void)dealloc
{
[myContainerView release], myContainerView = nil;
[myTableView release], myTableView = nil;
[mySearchActivityView release], mySearchActivityView = nil;
[myZeroResultsView release], myZeroResultsView = nil;
myCurrentlyShowingView = nil;
[super dealloc];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.currentlyShowingView = mySearchActivityView;
mySearchActivityView.backgroundColor = [UIColor clearColor];
myZeroResultsView.backgroundColor = [UIColor clearColor];
}
- (void)setCurrentlyShowingView:(UIView *)view
{
[myCurrentlyShowingView removeFromSuperview];
CGRect frame = view.frame;
frame.size = myContainerView.frame.size;
view.frame = frame;
[myContainerView addSubview:view];
myCurrentlyShowingView = view;
if (view == myTableView)
[myTableView reloadData];
}
- (UIView *)currentlyShowingView
{
return myCurrentlyShowingView;
}
#end
And in the -viewDidLoad method of the derived class, set off the (asynchronous) query:
- (void)viewDidLoad
{
[super viewDidLoad];
myQueryLoader = [[QueryLoader alloc] initWithQuery:#"whatever" delegate:self];
self.currentlyShowingView = mySearchActivityView;
}
and in the delegate callback:
- (void)queryLoader:(QueryLoader *)queryLoader didEndWithResults:(id)results error:(NSError *)error
{
myItems = [results retain];
if (myItems)
self.currentlyShowingView = myTableView;
else
self.currentlyShowingView = myZeroResultsView;
}
Hope this helps!