I have a method to get contacts from the address book and doing some stuff with them ("getContactInformation").
This process is a bit long (a few seconds) and after this process I show a new ViewController. To make it friendly to the user I would like to use MBProgressHUD to show an activity indicator at the beginning of the process and hide it at the end.
Which is the best way to do it? I've test this:
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.labelText = #"Retrieving information...";
[self getContactInformation];
[MBProgressHUD hideHUDForView:self.view animated:YES];
[self presentViewController:newController animated:NO completion:nil];
But it doesn't work (It doesn't show the indicator). Anyone can help me?
Thank you in advance
Keep a separate method for [self presentViewController:newController animated:NO completion:nil];. And try calling that method after some particular delay. That should be solving the problem.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
[self getContactInformation];
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:self.mapView animated:YES];
});
});
This will spawn a thread to run getContactInformation and won't block the main thread which is required to do UI changes (such as displaying the HUD).
I'm guessing the main thread is getting locked up when you get contact info and doesn't have time to update to show the HUD. Once the method is complete, it gets the main thread again to update the UI (removing the HUD).
Related
MPProgressView won't display when I try to push a viewcontroller until seconds before the pushed VC is displayed. Should the viewController be placed in the same function as the MBProgressView is displayed? I've made sure that my MBProgressView is on the main thread, I've tried many solutions on SO and can't see anyone with the same issue. I am simply trying to display the MBProgressHUD while the viewController is loading and being pushed. Thanks!
I am using MBProgressView as follows:
- (IBAction)pushButton:(id)sender
{
self.HUD =[MBProgressHUD showHUDAddedTo:self.view animated:YES];
[self.view addSubview:self.HUD];
self.HUD.labelText = #"Doing stuff...";
self.HUD.detailsLabelText = #"Just relax";
self.HUD.delegate=self;
[self.view addSubview:self.HUD];
[self.HUD showWhileExecuting:#selector(loadCreate) onTarget:self withObject:nil animated:YES];
}
- (void)loadCreate {
[self performSelectorOnMainThread:#selector(dataLoadMethodMail) withObject:nil waitUntilDone:YES];
}
-(void)dataLoadMethodMail
{NSLog(#"data load method is displaying");
SelectViewController *mvc = [[SelectViewController alloc] init];
[self.navigationController pushViewController:mvc animated:YES];
}
You don't need to add self.HUD to self.view, showHUDAddedTo: does it for you.
[self.HUD showWhileExecuting:#selector(loadCreate) onTarget:self withObject:nil animated:YES];
Shows the hud until loadCreate returns.
[self performSelectorOnMainThread:#selector(dataLoadMethodMail) withObject:nil waitUntilDone:YES];
dispatches something on main thread and returns right after (before the actual end of dataLoadMethodMail). The HUD is shown but disappears right away.
To solve the issue try hiding manually the HUD when dataLoadMethodMail finishes it's work.
Just replace
[self.HUD showWhileExecuting:#selector(loadCreate) onTarget:self withObject:nil animated:YES];
with
[self loadCreate];
and add
dispatch_async(dispatch_get_main_queue(), ^{
[self.HUD hide:YES];
});
at the end of dataLoadMethodMail
PS : Loading data should not be done on main thread.
I have a ViewController called GetInfoViewController. Basically it takes the users input and then sends the input to a NSObject class, ServerConnection. ServerConnection makes a nsurlconnection request and when it is done I want the MBProgressHUD to hide.
GetInfoViewController
- (IBAction)go:(id)sender{
ServerConnection *serverConnection = [[ServerConnection alloc]init];
MBProgressHUD *HUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
HUD.labelText = #"Searching...";
// here the progressHUD shows normally, and the yelpConnectionMethod is successful in retrieving the result.
[serverConnection yelpConnectionMethod];
}
-(void)endProgressHUD{
NSLog(#"end called");
[MBProgressHUD hideHUDForView:self.view animated:YES];
}
ServerConnection.h
I am not going to put all the nsurlconnection code because I don't think it really applies.. but if you want it I can post it
The only line that matters is:
(this is called after all the connections are done.)
GetInfoViewController *getinfoVC = [[GetInfoViewController alloc]init];
[getinfoVC endProgressHUD];
I call the endProgressHUD method of the getInfoViewController successfully, as it logs "end called". however, the progress hud stays spinning and does not hide.
Any input would be helpful.
Try this method when showing the HUD.
- (void)showWhileExecuting:(SEL)method onTarget:(id)target withObject:(id)object animated:(BOOL)animated;
It is a method of MBProgressHUD - selector should be the yelpConnectionMethod and target the serverConnection, object = nil and animated depends on you :)
First time working with a HUD and I'm confused.
I setup the HUD like this in my viewDidLoad:
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
[[[WSXmppUserManager shared] xmppStreamManager] connect];
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:self.view animated:YES];
});
});
The HUD doesn't show. I think the reason is as follows. The xmpp connect method fires off a connection request to the xmpp server and then it's done. So there is no activity to wait for as is.
However, the connection isn't established until the server responds and the following delegate method is fired:
- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender
I want to wait for this and only then dismiss the HUD, but I'm at a loss as to how to do that. I'm missing something very simple.
You need to move this code
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:self.view animated:YES];
});
After your long running method has finished... that is, if this code is indeed returning immediately
[[WSXmppUserManager shared] xmppStreamManager] connect];
The hud is likely never going to display... as it gets told to display and then told to hide on the same run loop or perhaps one run loop right afterwards...
Why not put it at the end of this method if this indicates that a response has been received and the operation is completed?
- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender
HUD =[[MBProgressHUD alloc] initWithWindow:self.view];
[HUD setDelegate:self];
[self.view addSubview:HUD];
[HUD showWhileExecuting:#selector(connectToServer)
onTarget:self
withObject:nil
animated:YES];
In the connectToServer
-(void)connectToServer
{
[[[WSXmppUserManager shared] xmppStreamManager] connect];
}
As soon as the connectToServer method comepletes it task in the background , a delegate of MBProgressHUD called hudWasHidden: is automatically called
-(void)hudWasHidden:(MBProgressHUD *)hud
{
//Further work after the background task completed
}
I am trying to implement the SVProgressHUD progress activity indicator. I copied the class from the [demo].1
My app loads up but the activity indicator doesn't show up. This is my first time trying to use one of these, so any help would be appreciated.
Here is the code:
#import "SVProgressHUD.h"
#implementation QuotesAppDelegate
- (void)startLoading
{
//call this in your app delegate instead of setting window.rootViewController to your main view controller
//you can show a UIActivityIndiocatorView here or something if you like
[SVProgressHUD show];
[self performSelectorInBackground:#selector(loadInBackground) withObject:nil];
}
- (void)loadInBackground
{
//do your loading here
//this is in the background, so don't try to access any UI elements
[self populateFromDatabase];
[SVProgressHUD dismiss];
[self performSelectorOnMainThread:#selector(finishedLoading) withObject:nil waitUntilDone:NO];
}
- (void)finishedLoading
{
//back on the main thread now, it's safe to show your view controller
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
}
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[self copyDatabaseIfNeeded];
[self startLoading];
}
For anyone else having a similar problem, this can also happen because you have a long loop or a piece of code that takes a long time to execute. If this happens, your progress bar wont be shown until after the loop, which kind of defeats the purpose.
To solve this issue you need to you this:
- (void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg
Basically your code would look something like this:
- (IBAction)submitPost:(id)sender {
//now we show the loading bar and submit the comment
[SVProgressHUD showWithStatus:#"Submitting post" maskType:SVProgressHUDMaskTypeGradient];
SEL aSelector = #selector(submitDataOfPost);
[self performSelectorInBackground:aSelector withObject:sender];
}
This will basically load the progress bar, and in a background thread, the method you want to execute will be called. This makes sure that the UI is updated (shows the progress hud) at the same time that your code is executed.
First of all you were not adding your SVProgressHUD to the view.
If your class inherited from UIViewController then [self.view addSubview:]; or if your class is simple UIView then [self addSubView:];
I do not understand your requirement but as far as i can understand through your code that you are showing [SVProgressHUD show]; in your startLoading method and then you are calling loadInBackground method in that method where you are hiding your hud using [SVProgressHUD dismiss];
I will suggest you to trace it by using breakpoint and figure it out.
I had the same problem. When I changed a version of SVProgressHUD to the later one the problem disappeared. My current version supports ARC.
=>
(IBAction)fetchData:(id)sender
{
[SVProgressHUD showWithStatus:#"Loading..." maskType:SVProgressHUDMaskTypeGradient];
[self performSelectorOnMainThread:#selector(getDataFromSomeWhere) withObject:nil waitUntilDone:NO];
}
=>
(void)getDataFromSomeWhere
{
//Do your data populating here. and dismiss the ProgressHud.
[SVProgressHUD dismiss];
}
I want to show an MBProgressHUD in my iPhone app without spawning new threads.
I have a very complicated set of business logic which sometimes (but not always) needs to wait for user input, and running on multiple threads ends up asking for user input multiple times at once, leading to crazy errors. Thus I would prefer to avoid running anything off of the main thread. However, due to this constraint, MBProgressHUD is not showing because the main thread is being blocked! Normally I would create my MBProgressHUD with the following code:
[HUD showWhileExecuting:#selector(myWorkerMethod) onTarget:self withObject:nil animated:YES];
But I would like to use the following code without blocking the main thread:
HUD = [[MBProgressHUD alloc] initWithView:self.view];
[self.view addSubview:HUD];
HUD.delegate = self;
HUD.minShowTime = 0.0;
HUD.labelText = #"some text";
[HUD show:YES];
Any thoughts?
How about this?
MBProgressHUD *HUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
HUD.labelText = #"Foo";
// code to execute synchronously
[MBProgressHUD hideHUDForView:self.view animated:YES];
Better late than never. You can do this with some run loop tickery. See this answer for details.