Update
I swapped out completely different code for pushViewController, and it is still crashing... seems like pushViewController is not the culprit. Here is what I added instead:
NSString *videoURL = [[NSString alloc] initWithFormat:#"http://www.vimeo.com/m/#/%#", videoID];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:videoURL]];
It opens up the URL in Safari, and then crashes.. wtf?
PushViewController crashes with no error in the console, but I do get an EXC_BAD_ACCESS error in Xcode. The crash doesn't happen until after the view controller has been pushed... but the view its pushing is empty... no code to mess up.
My code is below:
MainViewController.m
PlayVimeo *playTest = [[PlayVimeo alloc] initWithNibName:#"PlayVimeo" bundle:nil];
//playTest.videoID = videoID;
[self.navigationController pushViewController:playTest animated:YES];
[playTest release];
PlayVimeo.m
#import "PlayVimeo.h"
#import "SVProgressHUD.h"
#implementation PlayVimeo
#synthesize videoID, wView;
-(void)viewDidLoad {
[super viewDidLoad];
//Show loading alert
[SVProgressHUD showInView:self.view status:#"Loading Video..."];
}
-(void)viewWillAppear:(BOOL)animated {
NSLog(#"Play View Loaded!");
[self vimeoVideo];
}
-(void)vimeoVideo {
NSLog(#"Video ID: %#", videoID);
NSString *html = [NSString stringWithFormat:#"<html>"
#"<head>"
#"<meta name = \"viewport\" content =\"initial-scale = 1.0, user-scalable = no, width = 460\"/></head>"
#"<frameset border=\"0\">"
#"<frame src=\"http://player.vimeo.com/video/%#?title=0&byline=0&portrait=1&autoplay=1\" width=\"460\" height=\"320\" frameborder=\"0\"></frame>"
#"</frameset>"
#"</html>",
videoID];
NSLog(#"HTML String: %#", html);
[wView loadHTMLString:html baseURL:[NSURL URLWithString:#""]];
//Dismiss loading alert
[SVProgressHUD dismissWithSuccess:#"Playing..."];
}
- (void)viewDidUnload {
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
-(void)dealloc {
[super dealloc];
}
Navigation Controller Code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
[Appirater appLaunched];
return YES;
}
Console on crash:
sharedlibrary apply-load-rules all
Current language: auto; currently objective-c
(gdb)
It's likely that the culprit is
[playTest release];
Without seeing the rest of your code, I would still say that you likely need to release this after you're done with the video.
The code can not be fixed, it seems. With the UIWebView class reference, there is an example program TransWeb. Take this as base, it has a window and a navigation controller with a webview in it (in the xib). In MyViewController it reads a html-file and displays it. What you need to do is to change the main view to landscape and replace the html-code with yours. Avoid the frame-stuff.
Related
This question is very similar to an existing question asked here UIImagePickerControllerCameraDeviceFront only works every other time I tried the solution presented but it didn't work for me
I have a simplest of a project with two view controllers. In the blue one I am displaying a small UIView with a UIImagePickerController in it. NOTE: I am displaying front facing camera when app is launched.
I hit the next button and go to orange view controller and when I hit the back button and come back to blue view controller the UIImagePickerController flips from Front to rear. I guess the reason is that it thinks its busy and moves to the rear cam. If I keep moving back and forth between the view controllers the camera keeps flipping front, back, front, back, front, back...
Here is my code and screenshots, what am I doing wrong?
In my *.h
#import <UIKit/UIKit.h>
#interface v1ViewController : UIViewController <UIImagePickerControllerDelegate>
{
UIImagePickerController *picpicker;
UIView *controllerView;
}
#property (nonatomic, retain) UIImagePickerController *picpicker;
#property (nonatomic, retain) UIView *controllerView;
#end
In my *.m file (This code is only used when blue colored view controller is displayed)
#import "v1ViewController.h"
#import <MobileCoreServices/UTCoreTypes.h>
#implementation v1ViewController
#synthesize picpicker;
#synthesize controllerView;
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
picpicker = [[UIImagePickerController alloc] init];
picpicker.delegate = self;
picpicker.mediaTypes = [NSArray arrayWithObjects:(NSString *)kUTTypeImage, nil];
picpicker.sourceType = UIImagePickerControllerSourceTypeCamera;
picpicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
picpicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
picpicker.showsCameraControls = NO;
picpicker.navigationBarHidden = NO;
picpicker.wantsFullScreenLayout = NO;
controllerView = picpicker.view;
[controllerView setFrame:CGRectMake(35, 31, 250, 250)];
controllerView.alpha = 0.0;
controllerView.transform = CGAffineTransformMakeScale(1.0, 1.0);
[self.view addSubview:controllerView];
[UIView animateWithDuration:0.3
delay:0.0
options:UIViewAnimationOptionCurveLinear
animations:^{
controllerView.alpha = 1.0;
}
completion:nil
];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[picpicker dismissModalViewControllerAnimated:YES];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[picpicker dismissModalViewControllerAnimated:YES];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
#end
You are dismissing the controller in both the viewDidDisappear and viewWillDisappear methods.
That could be the cause of your problem.
Although I do not have a device with a camera available right now to verify this, it seems that you're not dismissing the pickerview controller correctly. The documentation states that you should call dismissModalViewControllerAnimated: on the parent controller in order to dismiss the picker (though, calls to presented controllers will propagate to presenters - so this is not the problem), but in your case you're not displaying the controller modally in the first place so it will not work.
What I would try in this case is to release the picker instead (if not under ARC) and set it to nil (instead of calling [picpicker dismissModalViewControllerAnimated:YES];).
PS. In fact, it seems that there is a bigger problem with your design. Since each button is set to present the other party modally you are not dismissing any of the controllers ever. The controllers just keep stacking on each other. You should either consider to embed them in a navigation controller and have it handle the hierarchy or just set dismissModalViewControllerAnimated: (dismissViewControllerAnimated:completion: on iOS5+) as the action of the second controller's button instead of a modal segue.
This is a very simple issue. I don't know why this happens exactly, but it seems that UIImagePickerController was designed to recreated each time it's needed instead of keeping any reference to it, which seems logical if you think about it. Basically, you need to recreate and reconfigure your picker each time. Below I've pasted some code to give an image of what I mean.
Simple solution:
- (UIImagePickerController *)loadImagePicker {
UIImagePickerController *picpicker = [[UIImagePickerController alloc] init];
picpicker.delegate = self;
picpicker.mediaTypes = [NSArray arrayWithObjects:(NSString *)kUTTypeImage, nil];
picpicker.sourceType = UIImagePickerControllerSourceTypeCamera;
picpicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
picpicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
picpicker.showsCameraControls = NO;
picpicker.navigationBarHidden = NO;
picpicker.wantsFullScreenLayout = NO;
return picpicker;
}
and in:
-(void)viewWillAppear:(BOOL)animated{
if(!self.picpicker){
self.picpicker = [self loadImagePicker];
[self.view addSubview: self.picpicker];
}
}
-(void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.picpicker removeFromSuperview];
self.picpicker = nil;
}
Recently I have come across a problem, where my app goes into background during initial launch, but this only happens on iPhone 4S with iOS6. I have tested on:
simulator, with different hardware/software configurations
iPhone 5 (iOS 6)
iPhone 4S (iOS 5.1)
iPad2 (iOS 6)
and it is working on all of them, but on the iPhone 4S with iOS6 the launch of the app takes about 20s before going into background, if you "re-launch" the app after a couple of seconds you see that it is still running and works without any problem.
Is there any know issue with iPhone4S (iOS6) that causes this or there is something special about this model? [I already tested it on different iPhone4s (iOS6) and it is happening on all of them]
EDIT
I noticed something weird will doing some more testing, iPhone 4s (iOS6) is the only one that doesn't show the loading screen (first view controller), it only shows the launch image.. anyway, here is the code for the AppDelegate and the first view controller:
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
// Optional: automatically track uncaught exceptions with Google Analytics.
[GAI sharedInstance].trackUncaughtExceptions = YES;
// Optional: set Google Analytics dispatch interval to e.g. 20 seconds.
[GAI sharedInstance].dispatchInterval = 20;
// Optional: set debug to YES for extra debugging information.
[GAI sharedInstance].debug = NO;
// Create tracker instance.
__unused id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingId:#"UA-APP-ID"];
return YES;
}
EcraPrincipalViewController.m
#import "EcraPrincipalViewController.h"
#import "ListaPercursosTableViewController.h"
#import "GlobalVars.h"
#import "AppDelegate.h"
#interface EcraPrincipalViewController ()
#end
#implementation EcraPrincipalViewController
{
int progresso;
int sizePercursos;
}
#synthesize lbl_versao;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.trackedViewName = #"iPhone - EcrãPrincipal";
// Do any additional setup after loading the view.
NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]];
UIStoryboard *story = [UIStoryboard storyboardWithName:#"WalkMeStoryBoard" bundle:nil];
ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:#"view_lista"];
[views replaceObjectAtIndex:0 withObject:listaV];
[self.navigationController setViewControllers:views];
lbl_info.text = NSLocalizedString(#"downloading", NULL);
lbl_versao.text = NSLocalizedString(#"walkme_versao", NULL);
dispatch_queue_t queue = dispatch_queue_create("com.WalkMe.downloadPercursos", NULL);
dispatch_async(queue, ^{
[[GlobalVars Instance] getLevadas:self];
});
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (BOOL)shouldAutorotate
{
return [[GlobalVars Instance] podeRodar];
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)novaAtualizacao
{
NSLog(#"Atualização encontrada");
lbl_info.text = NSLocalizedString(#"atualizacao_encontrada", NULL);
}
-(void)atualizarPercursosInternos
{
NSLog(#"VERIFICAÇAO Interna");
lbl_info.text = NSLocalizedString(#"a_atualizar_percursos", NULL);
}
-(void)setNewDownload:(NSNumber*)size
{
NSLog(#"Iniciou VERIFICAÇAO");
progresso = 0;
sizePercursos = [size intValue];
lbl_info.text = [NSString stringWithFormat:#"%# 0/%d", NSLocalizedString(#"novos_percursos", NULL), sizePercursos];
}
-(void)setProgress
{
NSLog(#"Progresso");
progresso++;
lbl_info.text = [NSString stringWithFormat:#"%# %d/%d", NSLocalizedString(#"novos_percursos", NULL), progresso, sizePercursos];
}
-(void)goToLista
{
NSLog(#"ACABOU VERIFICAÇAO");
UIStoryboard *story = [UIStoryboard storyboardWithName:#"WalkMeStoryBoard" bundle:nil];
[[GlobalVars Instance] getLevadas];
[self.navigationController pushViewController:[story instantiateViewControllerWithIdentifier:#"view_lista"] animated:NO];
}
- (void)viewDidUnload {
[self setLbl_versao:nil];
[super viewDidUnload];
}
#end
Thank you very much for your attention and help :)
While trying to figure out what was happening, the suggestions made in the comments to the question made me realize that for some reason the app was calling the same method twice and for some reason that cause the app to go to the background.
To solve the problem, simply remove this lines from viewDidLoad
NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]];
UIStoryboard *story = [UIStoryboard storyboardWithName:#"WalkMeStoryBoard" bundle:nil];
ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:#"view_lista"];
[views replaceObjectAtIndex:0 withObject:listaV];
[self.navigationController setViewControllers:views];
and add them to goToLista (this is called after the initial loading is complete).
I ended up with:
- (void)viewDidLoad
{
[super viewDidLoad];
self.trackedViewName = #"iPhone - EcrãPrincipal";
// Do any additional setup after loading the view.
lbl_info.text = NSLocalizedString(#"downloading", NULL);
lbl_versao.text = NSLocalizedString(#"walkme_versao", NULL);
dispatch_queue_t queue = dispatch_queue_create("com.WalkMe.downloadPercursos", NULL);
dispatch_async(queue, ^{
[[GlobalVars Instance] getLevadas:self];
});
}
-(void)goToLista
{
NSLog(#"ACABOU VERIFICAÇAO");
[[GlobalVars Instance] getLevadas];
NSMutableArray *views = [[NSMutableArray alloc] initWithArray:[self.navigationController viewControllers]];
UIStoryboard *story = [UIStoryboard storyboardWithName:#"WalkMeStoryBoard" bundle:nil];
ListaPercursosTableViewController *listaV = [story instantiateViewControllerWithIdentifier:#"view_lista"];
[views replaceObjectAtIndex:0 withObject:listaV];
[self.navigationController setViewControllers:views];
[self.navigationController pushViewController:[story instantiateViewControllerWithIdentifier:#"view_lista"] animated:NO];
}
This solves the problem, but I don't know why. If anyone knows please do tell, because I really would like to know.
Thank you :)
I've created an ARC Application that run's perfect. It's got a UINavigationController that I use to push through the views and everything runs fine.
I'm converting the Application to iPad and i've decided to show one of the views as a popover. (I don't like UIPopoverController so i've created my own basic popup). It's added to the view as follows..
MyViewController *hotelinf = [[MyViewController alloc]
initWithNibName:#"MyViewController_iPad" bundle:nil];
[self.view addSubview:hotelinf.view];
The view is added as a subview fine. The view i'm adding contains a UIWebView that has the usual delegate methods in it, but when the view tries to access one of the delegates it simply crashes.
*** -[MyViewController respondsToSelector:]: message sent to deallocated instance 0x7917b90
Specifically, it crashes on this line..
[self.webView loadHTMLString:stringResponse baseURL:nil];
I've displayed views (and UINavigationControllers) as subViews many of times without any issues, although none of them included a UIWebView delegate. I'm guessing I have to set the delegate of my UIViewController istance but i'm not sure how. It's also worth noting that if I push the view in my existing UINavigationController it calls and loads the HTML fine, which surely means it has nothing to do with the code of the view itself.
Any help would be greatly appreciated! Here is the code (in addition to above that shows the controller)..
.h
#interface MyViewController : UIViewController <UIWebViewDelegate, UIActionSheetDelegate> {
//Unrelated IBOutlets
}
#property (nonatomic, strong) UIWebView *webView;
#end
.m
#implementation MyViewController
#synthesize webView;
- (void)viewDidLoad
{
[super viewDidLoad];
self.webView = [[UIWebView alloc]initWithFrame:CGRectMake(317,283,393,354)];
self.webView.delegate = self;
[self.view addSubview:self.webView];
[NSThread detachNewThreadSelector:#selector(getHTMLString) toTarget:self withObject:nil];
}
-(void)getHTMLString {
#autoreleasepool {
//Download a valid HTML String
[self performSelectorOnMainThread:#selector(loadHTML) withObject:nil waitUntilDone:NO];
}
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
self.webView = nil;
}
-(void)loadHTML {
self.webView.opaque = NO;
self.webView.backgroundColor = [UIColor clearColor];
if ([stringResponse isEqualToString:#""]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Could not connect to XXXXX.com. Please verify you are connected to a working 3G/WIFI Network." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
} else {
//it crashes here only when loaded as a subview - the first access to the delegate
[self.webView loadHTMLString:stringResponse baseURL:nil];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
[self stopIndicator];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
if (error.code == NSURLErrorCancelled) return; // this is Error -999
[self stopIndicator];
// report the error inside the webview
NSString* errorString = [NSString stringWithFormat:
#"<html><center><font size=+10 color='black' face='Helvetica'>An error occurred:<br>%#</font></center></html>",
error.localizedDescription];
[self.webView loadHTMLString:errorString baseURL:nil];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Cannot load URL."
message:#"You have a connection failure. Please verify you are connected to a WIFI or 3G enabled Network."
delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
}
#end
The issue has nothing to do with the UIWebView, rather with your controller class. Indeed,
MyViewController *hotelinf = [[MyViewController alloc]
initWithNibName:#"MyViewController_iPad" bundle:nil];
[self.view addSubview:hotelinf.view];
You are allocating the controller and assigning it to a local variable; then you add the controller's view as subview to your current view. Doing that, that view is retained, but what happens to the controller object itself? Are you releasing it? Or it leaks (since it is assigned to a local variable)?
This possibly explains why when later the respondsToSelector method is called, the controller has already been deallocated...
A way to fix this is creating a new property or an ivar in your main controller class and store MyViewController in there. Don't forget to release it in dealloc.
I would also suggest another thing. In:
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
self.webView = nil;
}
set the webView delegate to nil before releasing the view:
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
self.webView.delegate = nil;
self.webView = nil;
}
And I would also possibly review the reason why you release the webView in viewDidDisappear. On the other hand you allocate it in viewDidLoad. This asymmetry is dangerous, since whenever the main view disappears (for any reason) the webView will be removed and when the view reappears, it is not there anymore.
Better add all the delegate methods. You havent added the first two. Most probably, your code is crashing when message webViewDidStartLoad is sent
– webView:shouldStartLoadWithRequest:navigationType:
– webViewDidStartLoad:
– webViewDidFinishLoad:
– webView:didFailLoadWithError:
I have intercepted URL opening by doing the following:
- (BOOL)openURL:(NSURL *)url{
URLViewController * web = [[URLViewController alloc] init];
web.url = url;
UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:web];
[nav.navigationBar setTintColor:[UIColor blackColor]];
[nav setModalPresentationStyle:UIModalPresentationFormSheet];
[self.detailViewController presentModalViewController:nav animated:NO];
[web release];
[nav release];
return YES;
}
I have a UITextView in which detects URL and when clicking on the URL it opens up the link in a ModalViewController. Full detail on what's going on can be seen here. Now the issue is, what if I want to open a URL in safari, is it still possible?
You should add an override flag indicating whether you want to exercise control or not.
#interface MyApplication : UIApplication {
}
-(BOOL)openURL:(NSURL *)url withOverride:(BOOL)override;
#end
#implementation MyApplication
-(BOOL)openURL:(NSURL *)url withOverride:(BOOL)override {
if ( !override ) {
return [super openURL:url];
}
if ([self.delegate openURL:url]) {
return YES;
} else {
return [super openURL:url];
}
}
-(BOOL)openURL:(NSURL *)url{
return [self openURL:url withOverride:YES];
}
#end
So now all calls that you want to bypass can be sent like this.
[[MyApplication sharedApplication] openURL:url withOverride:NO];
Original Answer
This is what you should do. Put it before the return YES; statement.
if ( [super canOpenURL:aURL] ) {
return [super openURL:aURL];
}
I have a UITabbBarController with a UITableView. Under certain circumstances the TabBarControllers dataset requires updating when a user arrives from another view,
e.g. the initial load when the TabBarController is called the first time, or when the settings are changed.
This dataset update takes about 2 seconds and I want to show an UIActivityIndicatorView.
Trouble is that when I enter from another view I don't know which view to attach it to, since the loading of the tabbarController is carried out in the viewWillAppear method.
Any clues how I can go about this?
I've done this sort of thing in the viewDidAppear method. My code kicks off a background task to load the data from a url. It also hands the background task a selector of a method to call on the controller when it is done. That way the controller is notified that the data has been downloaded and can refresh.
I don't know if this is the best way to do this, but so far it's working fine for me :-)
To give some more details, in addition to the selector of the method to call when the background task has loaded the data, I also and it a selector of a method on the controller which does the loading. That way the background task manages whats going on, but the view controller provides the data specific code.
Here's there viewDidAppear code:
- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if (reloadData) {
BackgroundTask *task = [[BackgroundTask alloc] initWithMethod:#selector(loadData) onObject:self];
task.superView = self.view.superview;
task.notifyWhenFinishedMethod = #selector(loadFinished);
[task start];
[task release];
}
}
The background task has an optional superView because it will add a new UIView to it containing an activity indicator.
BackgroundTask.m looks like this:
#implementation BackgroundTask
#synthesize superView;
#synthesize longRunningMethod;
#synthesize notifyWhenFinishedMethod;
#synthesize obj;
- (BackgroundTask *) initWithMethod:(SEL)aLongRunningMethod onObject:(id)aObj {
self = [super init];
if (self != nil) {
self.longRunningMethod = aLongRunningMethod;
self.obj = aObj;
}
return self;
}
- (void) start {
// Fire into the background.
NSThread *thread = [[NSThread alloc] initWithTarget:self selector:#selector(execute:)object:nil];
thread.name = #"BackgroundTask thread";
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(taskFinished:) name:NSThreadWillExitNotification object:thread];
[thread start];
[thread release];
}
- (void) execute:(id)anObject {
// New thread = new pool.
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
if (self.superView != nil) {
busyIndicatorView = [[BusyIndicator alloc] initWithSuperview:self.superView];
[busyIndicatorView performSelectorOnMainThread:#selector(addToSuperView)withObject:nil waitUntilDone:YES];
}
// Do the work on this thread.
[self.obj performSelector:self.longRunningMethod];
if (self.superView != nil) {
[busyIndicatorView performSelectorOnMainThread:#selector(removeFromSuperView)withObject:nil waitUntilDone:YES];
}
[pool release];
}
- (void) taskFinished:(NSNotification *)notification {
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSThreadWillExitNotification object:notification.object];
[self performSelectorOnMainThread:#selector(notifyObject)withObject:nil waitUntilDone:NO];
}
- (void) notifyObject {
// Tell the main thread we are done.
if (self.notifyWhenFinishedMethod != nil) {
[self.obj performSelectorOnMainThread:self.notifyWhenFinishedMethod withObject:nil waitUntilDone:NO];
}
}
- (void) dealloc {
self.notifyWhenFinishedMethod = nil;
self.superView = nil;
self.longRunningMethod = nil;
self.obj = nil;
[super dealloc];
}
#end
Finally as I said I put up a activity indicator. I have a xib which contains a 50% transparent blue background with an activity indicator in the middle. There is a controller for it which has this code:
#implementation BusyIndicator
#synthesize superView;
#synthesize busy;
- (BusyIndicator *) initWithSuperview:(UIView *)aSuperView {
self = [super initWithNibName:#"BusyIndicator" bundle:nil];
if (self != nil) {
self.superView = aSuperView;
}
return self;
}
- (void) addToSuperView {
// Adjust view size to match the superview.
[self.superView addSubview:self.view];
self.view.frame = CGRectMake(0,0, self.superView.frame.size.width, self.superView.frame.size.height);
//Set position of the indicator to the middle of the screen.
int top = (int)(self.view.frame.size.height - self.busy.frame.size.height) / 2;
self.busy.frame = CGRectMake(self.busy.frame.origin.x, top, self.busy.frame.size.width, self.busy.frame.size.height);
[self.busy startAnimating];
}
- (void) removeFromSuperView {
[self.busy stopAnimating];
[self.view removeFromSuperview];
}
- (void) dealloc {
self.superView = nil;
[super dealloc];
}
#end
Hoep this helps.