I am working on Instagram integration in IOS.Every thing goes well.I am geting the feeds of the user and displaying them on tableview and also in scroll view.Here the user is allowed to refresh the page.While refreshing the method is not getting called and its getting crashed because of zero objects in array.I had used the following code to call the method.
-(IBAction)loginAction:(id)sender
{
AppDelegate* appDelegate_new = (AppDelegate*)[UIApplication sharedApplication].delegate;
[appDelegate_new.instagram authorize:[NSArray arrayWithObjects:#"comments", #"likes", nil]];
if ([appDelegate.instagram isSessionValid]) {
// NSLog(#"ViewDidLoad Session Valid");
loginView.hidden=YES;
crossButton.hidden=YES;
settingsButton.hidden=NO;
noticeView.hidden=YES;
[self.view addSubview:feedsView];
// [self.logOutView removeFromSuperview];
self.feedsView.frame=CGRectMake(0, 0, 240, 300);
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:#"users/self/feed", #"method", nil];
[appDelegate.instagram requestWithParams:params
delegate:self];
}
}
The called method was like this
- (void)request:(IGRequest *)request didLoad:(id)result
{
[self performSelector:#selector(startspinner) withObject:nil afterDelay:0.1];
self.data = (NSMutableArray *)[result objectForKey:#"data"];
// NSLog(#"Data Count is %#",[self.data description]);
createdArray=[[NSMutableArray alloc]init];
//*****Here I am performing Json Parsing******//
}
I am calling the above request method again while refreshing
- (void)dropViewDidBeginRefreshing:(ODRefreshControl *)refreshControl
{
[createdArray removeAllObjects];
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:#"users/self/feed", #"method", nil];
[appDelegate.instagram requestWithParams:params
delegate:self];
[self performSelector:#selector(refreshData) withObject:nil afterDelay:5.0];
}
Please tell me where I am going wrong.Correction appreciated.Thanks in advance.
Try it....
[NSTimer scheduledTimerWithTimeInterval:0.5f
target:self
selector:#selector(showTime)
userInfo:NULL
repeats:YES];
- (void)showTime
{
NSLog(#"Method called");
}
Use NSTimer for call method frequently.
Hope i helped.
Related
I have an app that updates the interface depending on the result of a NSURL request. I have set it up so that the request is fired when my app comes into the foreground, and only if the current view controller is called "ProfileViewController".
My problem is that the interface locks up for a few seconds every time I bring the app back from the background. I am trying to fully understand main/background threads, but am not sure what I can do to make the app remain responsive while the NSURL check is being performed. Any assistance would be great! Thanks!
In my View Did Load Method:
-(void)viewDidLoad {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(appReturnsActive) name:UIApplicationDidBecomeActiveNotification
object:nil];
//additional code
}
Then in my App Returns Active Method:
- (void)appReturnsActive {
[myTimer invalidate];
myTimer = nil;
//ONLY WANT TO PERFORM THE UPDATE IF VIEWING THE PROFILE VIEW CONTROLLER
UIViewController *currentVC = self.navigationController.visibleViewController;
NSString * name = NSStringFromClass([currentVC class]);
if ([name isEqualToString:#"ProfileViewController"]) {
[activityIndicator startAnimating];
[activityIndicatorTwo startAnimating];
locationManagerProfile.delegate = self;
locationManagerProfile.desiredAccuracy = kCLLocationAccuracyBest;
[locationManagerProfile startUpdatingLocation];
}
}
Finally, in my Did Update Location Method, I get the distance between the user and the location. If the result is equal to 1, then I update the Interface to show different buttons. This is where the interface freezes up:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation
*)newLocation fromLocation:(CLLocation *)oldLocation {
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
[self performSelectorOnMainThread:#selector(buttonUpdate:)
withObject:NULL waitUntilDone:NO];
}
}
New Method:
-(void)buttonUpdate {
NSString *userLongitude =[NSString stringWithFormat:#"%.8f",
currentLocation.coordinate.longitude];
NSString *userLatitude = [NSString stringWithFormat:#"%.8f",
currentLocation.coordinate.latitude];
[locationManagerProfile stopUpdatingLocation];
NSString *placeLatitude = [[NSUserDefaults standardUserDefaults]
stringForKey:#"savedLatitude"];
NSString *placeLongitude = [[NSUserDefaults standardUserDefaults]
stringForKey:#"savedLongitude"];
NSString *distanceURL = [NSString
stringWithFormat:#"http://www.website.com/page.php?
lat1=%#&lon1=%#&lat2=%#&lon2=%#",userLatitude, userLongitude, placeLatitude,
placeLongitude];
NSData *distanceURLResult = [NSData dataWithContentsOfURL:[NSURL
URLWithString:distanceURL]];
NSString *distanceInFeet = [[NSString alloc] initWithData:distanceURLResult
encoding:NSUTF8StringEncoding];
if ([distanceInFeet isEqualToString:#"1"])
{
UIBarButtonItem *btnGo = [[UIBarButtonItem alloc] initWithTitle:#"Button 1"
style:UIBarButtonItemStyleBordered target:self
action:#selector(actionTwo)];
self.navigationItem.rightBarButtonItem = btnGo;
UIBarButtonItem *btnGoTwo = [[UIBarButtonItem alloc] initWithTitle:#"Button
Two" style:UIBarButtonItemStyleBordered target:self
action:#selector(actionOne)];
self.navigationItem.rightBarButtonItem = btnGoTwo;
self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects:btnGo,
btnGoTwo, nil];
}
}
Your CoreLocation delegate methods (e.g. "didUpdateToLocation", etc.) are all happening in the background, on secondary threads, while everything UI-related needs to happen on the main thread.
To fix your problem, you should modify your UI on the main thread. One of the handy foundation API's you can use is:
performSelectorOnMainThread:withObject:waitUntilDone:
To fix your problem, move your button-creating code into a separate method and call that new method via "performSelectorOnMainThread" from the old (being called on a separate thread via the CoreLocation delegate protocol) and you should be good to go.
NSData *distanceURLResult = [NSData dataWithContentsOfURL:[NSURL
URLWithString:distanceURL]];
is a synchronous call. It means your code will wait for the result of the network call to continue. You should make an Asynchronous request, with NSURLConnection (http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html) or AFNetworking.
I'm developing an app to help me understand OBJECTIVE-X/OSX.
The app simply connects to Facebook and sends a notification using NSUserNotification.
It is working fine, but now I want to add some UI to the mix.
To make the example simpler, I want to update a label (NSTextField) to show the status of the Facebook connection.
Connecting…
Connected
Failed
I have the following code in one File FacebookRequest.m
- (void) connectFacebook{
if(self.account == nil){
self.account = [[ACAccountStore alloc]init];
}
ACAccountType *facebookAccount = [self.account
accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
NSDictionary *options = #{
ACFacebookAppIdKey: #"MY_CODE",
ACFacebookPermissionsKey: #[#"email",
#"user_about_me",
#"user_likes",
#"manage_notifications",
#"user_activities"],
ACFacebookAudienceKey: ACFacebookAudienceFriends
};
[self.account requestAccessToAccountsWithType:facebookAccount
options:options
completion:^(BOOL success, NSError *error){
if(success){
NSArray *accounts = [self.account accountsWithAccountType:facebookAccount];
self.account = [accounts lastObject];
}
else{
NSLog(#"Erro %#", [error description]);
}
}];
}
and the following one in my AppDelegate.m
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
[self.statusFacebook setStringValue:#"Connecting…"];
FacebookRequest *request = [[FacebookRequest alloc]init];
[request connectFacebook];
}
What is the best way to update the UI after the request is complete and I have an account?
I'm having troubles since the request is asynchronous and I can't return any value inside the requestAccessToAccountsWithType block. Another point is that if I put some "ifs" to check if my account is nil after it, it will be executed before the block has finished executing, so the account would still be nil.
Thanks!
PS.: Sorry for the English if it is not clear enough.
You may use NSNotificationCenter for this purpose:
[self.account requestAccessToAccountsWithType:facebookAccount
options:options
completion:^(BOOL success, NSError *error){
if(success){
NSArray *accounts = [self.account accountsWithAccountType:facebookAccount];
self.account = [accounts lastObject];
// You post a notification that the UI should update here
[[NSNotificationCenter defaultCenter] postNotificationName:#"UpdateUI" object:nil];
}
else{
NSLog(#"Erro %#", [error description]);
}
}];
Then, you add your viewController that should update its UI as an observer of this notification:
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(updateUI) name:#"UpdateUI" object:nil];
}
- (void)updateUI {
// Here you actually update your UI
}
p.s. if you are not using arc you also remove the observer in dealloc:
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
in iOS 5.0 i was opening Twitter setting from my app by
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:#"prefs:root=TWITTER"]];
but , this features is removed in iOS 5.1 , hence i can not able to open twitter setting .
Now i am using
+ (void)makeRequestsWithURL: (NSURL *)url {
// Create an account store object.
ACAccountStore *accountStore = [[ACAccountStore alloc] init];
// Create an account type that ensures Twitter accounts are retrieved.
ACAccountType *accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];
[self canTweetStatus];
// Request access from the user to use their Twitter accounts.
[accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) {
if(granted) {
// Get the list of Twitter accounts.
NSArray *accountsArray = [accountStore accountsWithAccountType:accountType];
// For the sake of brevity, we'll assume there is only one Twitter account present.
// You would ideally ask the user which account they want to tweet from, if there is more than one Twitter account present.
if ([accountsArray count] > 0) {
// Grab the initial Twitter account to tweet from.
ACAccount *twitterAccount = [accountsArray objectAtIndex:0];
// Create a request, which in this example, posts a tweet to the user's timeline.
// This example uses version 1 of the Twitter API.
// This may need to be changed to whichever version is currently appropriate.
TWRequest *postRequest = [[TWRequest alloc] initWithURL:url parameters:nil requestMethod:TWRequestMethodPOST];
// Set the account used to post the tweet.
[postRequest setAccount:twitterAccount];
// Perform the request created above and create a handler block to handle the response.
[postRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
NSString *output = [NSString stringWithFormat:#"HTTP response status: %i", [urlResponse statusCode]];
iOS5Twitter *twitter5 = [[iOS5Twitter alloc] init];
[twitter5 performSelectorOnMainThread:#selector(displayText:) withObject:output waitUntilDone:NO];
[twitter5 release]; }];
}
}
}];
}
for making request, i am able to check wether i am loged in or not by the
if ([TWTweetComposeViewController canSendTweet])
but now i want : if i am not loged in it would be show an alert like shown in image and want to move to the twitter setting . is it possible ? or i have to manually go ti twitter setting ?
It is little tricky , i get by the removing the subviews in *TWTWeetComposeViewController*, so it shows only alert when user is not loged in and by the clicking on setting button , we can open Setting page in my app.
+ (void)setAlertForSettingPage :(id)delegate
{
// Set up the built-in twitter composition view controller.
TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];
// Create the completion handler block.
[tweetViewController setCompletionHandler:^(TWTweetComposeViewControllerResult result) {
[delegate dismissModalViewControllerAnimated:YES];
}];
// Present the tweet composition view controller modally.
[delegate presentModalViewController:tweetViewController animated:YES];
//tweetViewController.view.hidden = YES;
for (UIView *view in tweetViewController.view.subviews){
[view removeFromSuperview];
}
}
here , deleate is your viewcontroller , if you are using this method inside your viewcontroller just use self instead of delegate.
iOS 6 uses SLComposeViewController instead of TWTweetComposeViewController, so now you have to do this if you want it to work on iOS 6 and iOS 5:
UIViewController *tweetComposer;
if([SLComposeViewController class] != nil)
{
tweetComposer = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
[(SLComposeViewController *)tweetComposer setCompletionHandler:^(SLComposeViewControllerResult result)
{
// do whatever you want
}];
}
else
{
tweetComposer = [[TWTweetComposeViewController alloc] init];
[(TWTweetComposeViewController *)tweetComposer setCompletionHandler:^(TWTweetComposeViewControllerResult result)
{
// do whatever you want
}];
}
for (UIView *view in [[tweetComposer view] subviews])
[view removeFromSuperview];
[self presentViewController:tweetComposer animated:NO completion:nil];
Building upon Senior's and PJR's answers above, this is what worked for me.
Same as Senior's, except with a dimissViewController in the completion handler. For me this got around the problem that the empty view controller would stick around after I returned to the app from the settings. It would overlay my view controller and make it useless.
Brilliant solution, thanks Senior and PJR.
UIViewController *tweetComposer;
if([SLComposeViewController class] != nil)
{
tweetComposer = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
[(SLComposeViewController *)tweetComposer setCompletionHandler:^(SLComposeViewControllerResult result)
{
[self dismissViewControllerAnimated:NO completion:nil];
}];
}
else
{
tweetComposer = [[TWTweetComposeViewController alloc] init];
[(TWTweetComposeViewController *)tweetComposer setCompletionHandler:^(TWTweetComposeViewControllerResult result)
{
[self dismissViewControllerAnimated:NO completion:nil];
}];
}
for (UIView *view in [[tweetComposer view] subviews])
[view removeFromSuperview];
[self presentViewController:tweetComposer animated:NO completion:nil];
To remove the post view,
instead using this code:
for (UIView *view in [[tweetComposer view] subviews])
[view removeFromSuperview];
use this:
tweetComposer.view.alpha = 0;
works both for twitter and facebook.
In my app, i have Used UiimagepickerController for taking Video.in bettween my programm received any web service Which belongs to my app,
i have to stop Video Capture and save video.
i have Used StopVideoCapture to do above thing ,but it doesn't call delegate - `
(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
How to force call above delegate ??.or How to handle interruption Handling inUIImagePickerController`.. any idea?
The idea with delegate methods is not that you call those methods - "They call you".
So I would not consider calling the delegate method yourself a good practise. However, if you present the UIImagePickerViewController with a modal dialogue (which I guess is common for such a picker) then you can close it like this outside of your delegate method:
[[yourPicker parentViewController] dismissModalViewControllerAnimated:YES];
Source
Update: You can use the ALAssetsLibrary for accessing the stored data in your iPhone media library. I recently had to do a similar project where I had to list all images on the iPhone. The Github project ELCImagePickerController.git was very useful since it shows how the items in your library can be accessed. So you'll do something like this:
#import <AssetsLibrary/AssetsLibrary.h>
// ....
-(void)fetchPhotoAlbums{
if(!self.assetsGroups){
self.assetsGroups = [NSMutableDictionary dictionary];
}
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
NSMutableArray *returnArray = [[NSMutableArray alloc] init];
#autoreleasepool {
void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop){
if (group == nil){
// Completed
[self.delegate pictureService:self fetchedAlbums:returnArray];
return;
}
Album *currentAlbum = [self albumForAssetsGroup:group];
// Store the Group for later retrieving the pictures for the album
[self.assetsGroups setObject:group forKey:currentAlbum.identifier];
[returnArray addObject:currentAlbum];
[self.delegate pictureService:self fetchedAlbums:returnArray];
};
void (^assetGroupEnumberatorFailure)(NSError *) = ^(NSError *error) {
NSLog(#"A problem occured %#", [error description]);
};
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:assetGroupEnumerator
failureBlock:assetGroupEnumberatorFailure];
}
}
-(void)fetchPhotosForAlbum:(Album *)album{
ALAssetsGroup *currentGroup = [self.assetsGroups objectForKey:album.identifier];
NSMutableArray *photos = [NSMutableArray array];
[currentGroup enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop){
if(asset == nil){
[self.delegate pictureService:self fetchedPictures:photos forAlbum:album];
return;
}
[photos addObject:[self pictureForAsset:asset]];
}];
}
Additionally I use two mapper methods to convert the AL-classes into my own model classes.
- (Album *)albumForAssetsGroup:(ALAssetsGroup *)assetsGroup{
Album *album = [[Album alloc] init];
album.title = [assetsGroup valueForProperty:ALAssetsGroupPropertyName];
album.identifier = [assetsGroup valueForProperty: ALAssetsGroupPropertyPersistentID];
album.assetsCount = assetsGroup.numberOfAssets;
album.thumbnail = [UIImage imageWithCGImage:assetsGroup.posterImage];
return album;
}
- (Picture *)pictureForAsset:(ALAsset *)asset{
Picture *picture = [[Picture alloc]init];
picture.identifier = [((NSArray *)[asset valueForProperty: ALAssetPropertyRepresentations]) objectAtIndex:0];
picture.thumbnail = [UIImage imageWithCGImage:asset.thumbnail];
return picture;
}
See the AssetsLibrary Documentation
I am doing my functionality in a secondary thread and once I get the result, I call the function that pops my ViewController in the main thread. But I get the following error:
void WebThreadLockFromAnyThread(), 0x5c6dec0: Obtaining the web lock from a thread other than the main thread or the web thread. UIKit should not be called from a secondary thread..
I am using the code below:
-(IBAction)done{
if([self validateRegistrationDetails]){
[NSThread detachNewThreadSelector:#selector(invokeWebService) toTarget:self withObject:nil];
}
}
-(void) invokeWebService{
NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];
NSString *url = [NSString stringWithFormat:#"%#%#action=1&userName=%#&eMail=%#&firstName=%#&lastName=%#&mobileNo=%#",kBaseURL,kRegisterFunction,userName.text,eMail.text,firstName.text,lastName.text,mobileNo.text];
[ADCUtilities performSelectorOnMainThread:#selector(updateText:) withObject:#"Registering... "waitUntilDone:NO];
[ADCUtilities performSelectorOnMainThread:#selector(showIndicator:) withObject:self.view waitUntilDone:NO];
NSDictionary *tempDict = [webService makeAPICall:url];
[NSThread sleepForTimeInterval:3];
if(tempDict!=nil){
NSString *tempLoginSuccess = [tempDict valueForKey:kLoginStatus] ;
if([tempLoginSuccess isEqual:#"LoginSuccess"]){
[ADCUtilities displayAlertView:NSLocalizedString(#"REG_SUCCESS",#"")];
[self performSelectorOnMainThread:#selector(popViewController) withObject:nil waitUntilDone:NO];
} else {
[ADCUtilities performSelectorOnMainThread:#selector( dismissIndicator) withObject:nil waitUntilDone:NO];
[ADCUtilities displayAlertView:NSLocalizedString(#"REG_FAILED",#"")];
}
} else {
[ADCUtilities performSelectorOnMainThread:#selector( dismissIndicator) withObject:nil waitUntilDone:NO];
[ADCUtilities displayAlertView:NSLocalizedString(#"REG_FAILED",#"")];
}
[pool release];
}
-(void)popViewController{
[self.navigationController popViewControllerAnimated:YES];
}
I think your problem is actually [ADCUtilities displayAlertView:NSLocalizedString(#"REG_SUCCESS",#"")], which I assume displays some sort of UIAlertView. You should never access any UIKit classes except from the main thread.