ios - UIWebView screen taps in area cease to work after showing then hiding a UIView overlay -

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i have been working on app features full screen uiwebview contains html based application. features working qr code scan using native bridge between js , native obj-c code. tapping button launches uiview half size of overall display, overlay, inside see video feed , when qr code detected passes code , uiview closed. works treat.

however uiwebview suffers odd issue, elements have been underneath uiview become untappable. it's if there ghost of uiview still present.

any ideas why occurring?

- (void)handlecall:(nsstring*)functionname callbackid:(int)callbackid args:(nsarray*)args {     if ([functionname isequaltostring:@"setbackgroundcolor"]) {         ....... snip ........ } else if ([functionname isequaltostring:@"scanqrcode"]) {      _viewpreview = [[uiview alloc] initwithframe:cgrectmake(256, 192, 512, 384)];      [self addsubview:self.viewpreview];     [self bringsubviewtofront:_viewpreview];      _capturesession = nil;      if (!_isreading) {       if ([self startreading]) {         nslog(@"read barcode: %@", @"started");       }     }     else{       [self stopreading];        [_viewpreview removefromsuperview];       [_viewpreview release];       }      _isreading = !_isreading;   }   else   {     nslog(@"unimplemented method '%@'",functionname);    [unireader requestswipe];    [self returnresult:callbackid args:nil];     } }  - (bool)startreading {   nserror *error;    avcapturedevice *capturedevice = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo];    avcapturedeviceinput *input = [avcapturedeviceinput deviceinputwithdevice:capturedevice error:&error];    if (!input) {     nslog(@"%@", [error localizeddescription]);     return no;   }    _capturesession = [[avcapturesession alloc] init];   [_capturesession addinput:input];    avcapturemetadataoutput *capturemetadataoutput = [[avcapturemetadataoutput alloc] init];   [_capturesession addoutput:capturemetadataoutput];    dispatch_queue_t dispatchqueue;   dispatchqueue = dispatch_queue_create("myqueue", null);   [capturemetadataoutput setmetadataobjectsdelegate:self queue:dispatchqueue];   [capturemetadataoutput setmetadataobjecttypes:[nsarray arraywithobject:avmetadataobjecttypeqrcode]];    _videopreviewlayer = [[avcapturevideopreviewlayer alloc]    initwithsession:_capturesession];  [_videopreviewlayer setvideogravity:avlayervideogravityresizeaspectfill];  [_videopreviewlayer setframe:_viewpreview.layer.bounds];  [_viewpreview.layer addsublayer:_videopreviewlayer];  // since app landscape only, necessary rotate preview view match  [_videopreviewlayer.connection setvideoorientation:avcapturevideoorientationlandscapeleft];  // start video capture.  [_capturesession startrunning];   return yes;

}

 -(void)stopreading{  [_capturesession stoprunning];  _capturesession = nil;     nslog(@"read barcode: %@", @"stop scanning");   [_videopreviewlayer removefromsuperlayer];

}

   -(void)captureoutput:(avcaptureoutput *)captureoutput    didoutputmetadataobjects:(nsarray *)metadataobjects fromconnection:  (avcaptureconnection *)connection{   // check if metadataobjects array not nil , contains @ least 1 object.  if (metadataobjects != nil && [metadataobjects count] > 0) {  // metadata object.  avmetadatamachinereadablecodeobject *metadataobj = [metadataobjects objectatindex:0];  nsstring *barcodestring = metadataobj.stringvalue;  nslog(@"detected qr: %@", barcodestring);  nsstring *javascript = [nsstring stringwithformat:@"setqr('%@')", barcodestring];  if ([[metadataobj type] isequaltostring:avmetadataobjecttypeqrcode]) {   // if found metadata equal qr code metadata update status label's text,   // stop reading , change bar button item's title , flag's value.   // done on main thread.    [self performselectoronmainthread:@selector(stopreading) withobject:nil waituntildone:no];    _isreading = no;   [self performselectoronmainthread:@selector(stringbyevaluatingjavascriptfromstring:) withobject:javascript waituntildone:no]; }

} }

@end

is scanqrcode called twice: once add , once remove overlay? if add new overlay view @ start. stopreading remove running video superview (the original overlay) remove latest overlay screen. leave original overlay window no content issue?


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