Tried to obtain the web lock from a thread other than the main thread or the web thread. Crashing now

Question

bool _WebTryThreadLock(bool), 0x8053ce0: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UI

Answer 1

I had a similar issue and used

performSelectorOnMainThread:withObject:waitUntilDone:

to solve it. Hope that helps.

Answer 2

I too faced this issue while i was calling a method by

[self performSelector:@selector(myMethod) withObject:nil afterDelay:.01];

Now it has solved by performing it on main thread

[self performSelectorOnMainThread:@selector(myMethod) withObject:nil waitUntilDone:NO];

Answer 3

if you are going to do any UI operation it has to be done on main thread..

simply paste the coding inside the following syntax

dispatch_sync(dispatch_get_main_queue(), ^{

//Your code goes here

});

or you can call your method using the following syntax

[self performSelectorOnMainThread:@selector(yourmethod:)withObject:obj waitUntilDone:YES]

Hope this helps

Answer 4

Durai answer in Swift 3:

DispatchQueue.main.async {
  //Your code goes here
}

Answer 5

//The easiest way is to call the function using main thread for that.

dispatch_async(dispatch_get_main_queue(), ^{ [self doSomething]; });

Answer 6

This may be a result of calling to UIKit from a secondary thread. Crashing now...

...and as far as I can see that's just what you're doing. You're calling [alertProgress dismissWithClickedButtonIndex:0 animated:YES];, a UIKit method, from a thread other than your main thread(s), which is not allowed.

For a very straight forward way to call back to the main thread if you can't use GCD, take a look at DDFoundation.

Your code would in that case only change to do;

[[alertProgress dd_invokeOnMainThread] dismissWithClickedButtonIndex:0 
                                       animated:YES];