iOS how to tell when webViewDidFinishLoad has completed? - ios

Question

I have some code inside the webViewDidFinishLoad delegate method, and I need some way to tell that this code has finished executing from within another method in a completely different part of my code. Is this possible? Basically what I want to do is something like this:
-(void) myMethod
{
// do stuff that causes webViewDidFinishLoad to be called
if (webViewDidFinishLoad has finished executing)
{
// do stuff with outputString
}
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
outputString = [webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:#"myJSFunction('%#')",jsInputString]];
}
I looked at this answer already and it made no sense to me.
I should add that inside myMethod, I can be sure that webViewDidFinishLoad will only be called once.

Answer 1

You can always set a boolean to indicate whether the webview has finished loading.
And the value of the boolean will be changed in the webview delegate method:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
loadFinished = YES;
}
Then in your own method, check "loadFinished" will do the task.
You have to set <UIWebViewDelegate> for interface to use this delegate method

Answer 2

Try to avoid waiting for delegates and notifications in other methods - do the work that depends on them when they call back to your class. Don't call myMethod until you get the delegate message. If myMethod is called from user input, disable the associated controls until after the web view loads.

Answer 3

You could use UIWebView's iVar loading
You could use your own shared boolean flag as iVar and set it in webViewDidFinishLoad.
However, maybe you could reconsider your design and do in webViewDidFinishLoad what to do after loading is finished.

Answer 4

Why not try GCD?
dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// WebView load content here
dispatch_async( dispatch_get_main_queue(), ^{
// load myMethod
});
});

Answer 5

use a Boolean and set its value to YES in the last line of webViewDidFinishLoad.
then check in your myMethod like this:
-(void) myMethod
{
// do stuff that causes webViewDidFinishLoad to be called
if (yourBoolean == YES)
{
// do more stuff
}
}
that should do your work.

Answer 6

In webViewDidFinishLoad, you post a notification to your "myMethod" code part.
Something like this:
in UIWebView:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
[[NSNotificationCenter defaultCenter] postNotificationName:#"webview_finished" object:self userInfo:nil];
}
in your "myMethod" code part:
- (void)viewDidLoad
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(myMethod) name:#"webview_finished" object:nil];
}