Close Child View from Parent

For some reason when I close my child view it causes an error with my webvi开发者_如何转开发ew (in the parent view). The call I am using to close the child view: (I don't know if this is the right way to do it)

[normalSplashScreen_vc closeNormalSplashScreen];

Gives me the following error:

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 UIKit from a secondary thread. Crashing now...

I can't figure out why closing a child view effects the underlying webview?

(I think by calling the closeNormalSplashScreen function I am closing the main view even though it is called in the child view - if this is the case how do I remedy this problem?)

Main View

@interface turfplusViewController : UIViewController {
    IBOutlet splashScreen *FirstRunsplashScreen_vc;
    IBOutlet NormalSplashScreen *normalSplashScreen_vc;
    IBOutlet UIWebView *Webview;
}

@property(nonatomic, retain) splashScreen *FirstRunsplashScreen_vc;
@property(nonatomic, retain) NormalSplashScreen *normalSplashScreen_vc;

// Obviously these functions are declared correctly but for the sake of space

 - (void) displayFirstRunSplashScreen { 
    [self presentModalViewController:FirstRunsplashScreen_vc animated:NO];
}

- (void) displayNormalSplashScreen {
    [self presentModalViewController:normalSplashScreen_vc animated:NO];
}

SplashScreen

The Two splash screens are essentially the same (with the firstRun one having a progress bar).

@interface NormalSplashScreen : UIViewController {
    IBOutlet UIActivityIndicatorView *NormalActivityIndicator;
}

@property(nonatomic, retain) UIActivityIndicatorView *NormalActivityIndicator;

// Obviously these functions are declared correctly but for the sake of space

- (void) closeNormalSplashScreen {
    [self dismissModalViewControllerAnimated:YES];
}

Relates to this and this question. (The second one doesn't answer the question... is it possible?)

This error usually shows up when you do a UI operation from a thread which is not the main thread.

Where are you calling the method closeNormalSplashScreen from? Is it being called from a different thread than the main thread?

Try doing this and see if the error still comes up

[normalSplashScreen_vc performSelectorOnMainThread:@selector(closeNormalSplashScreen) withObject:nil waitUntilDone:YES]; //last argument will change depending on your requirement