ios - Highlight attributedtext UITextView using NSRanges to an array value? -

haven't had luck in searching, hoping make story text animate (change colour)in sync audio clip quite stuck how (i'm quite new @ coding)

i'm stuck how find correct range, word gets coloured , how update string in sync .caf; how connect , colour correct ranges im guessing run action duration (using audiointervals array timing)

//    int wordcount = 0; int wordcount = 0; int indexcount = 0; //for (nsstring *word in wordsinarray)     (nsmutableattributedstring *word in wordsinarray)   //*wordsinarray = componentsseparatedby whitespace {      if (wordcount < [audiointervals count])     //wordcount less audiointervals     {       nsstring *orange = @"orange\n\n";//change text orange       // action duration here on       //original mutable string block/duration/delay audiointerval       //how range***********the bit i'm stuck on**********      [attstring addattributes:colour01 range:nsmakerange(0,???)];      [attstring addattributes:colour02 range:nsmakerange(???,???)];      [attstring addattributes:colour01 range:nsmakerange(???,???)];      //*************************************************************      mytext.attributedtext = attstring; 

i'm confused how range works - how can use interval times range? correct word picked coloured or returned original colour) }

    ...more code      wordcount++;     nslog(@"time  %@, %i, index %@\n\n",word,wordcount,[audiointervals objectatindex:indexcount]);     indexcount++;     rangestart = rangeend +1; 

} }

log shows audiointerval duration, time text colour, colour + word count how right range on uitextfield?? on stuck!

//which shows plists , word count  //and colourswap logic working  duration 0.176387 @colour orange time 0.176387 @colour black this, 1, duration 0.274997 @colour orange time 0.274997 @colour black is, 2, duration 0.345829 @colour orange time 0.345829 @colour black the, 3, duration 0.612493 @colour orange time 0.612493 @colour black text, 4, duration 0.9763770000000001 @colour or time 0.9763770000000001 @colour black for, 5, 

//in simple tests can colour few words in sentence how can use update coloured word sound timing see "boldtextinrangewithcolour" test,

//my small test of applying style text in uitextview //its result photo see 

-(void)boldtextinrangewithcolour { nsstring *infostring =content;

    //nsmutableattributedstring alows bold styling     nsmutableattributedstring *attstring=     [[nsmutableattributedstring alloc] initwithstring:infostring];      //styling     uifont *font_regular=     [uifont fontwithname:@"avenir-light" size:30.0f];     uifont *font_bold=     [uifont fontwithname:@"avenirnext-bold" size:30.0f];     uicolor* textcolorblack =      [uicolor blackcolor];     uicolor* textcolorred =      [uicolor redcolor];      nsdictionary *colour01      = @{ nsforegroundcolorattributename : textcolorblack,     nsfontattributename : font_regular,     };      nsdictionary *colour02      = @{ nsforegroundcolorattributename : textcolorred,     nsfontattributename : font_regular,     };      /*attstring nsmutableattributedstring      paragraph of story text*/      [attstring addattributes:colour01      range:nsmakerange(0, 4)]; //black     //how ranges work can use audiointervals or wordcount     //to find correct word colour      [attstring addattributes:colour02      range:nsmakerange(5, 15)]; //orange      [attstring addattributes:colour01      range:nsmakerange(16, infostring.length - 15 - 1)];//black      mytext.attributedtext = attstring; } 

if use avaudioplayer play sounds, can use avaudioplayerdelegate method, audioplayerdidfinishplaying:successfully: know when sound has stopped playing, , move next word.

this more robust relying on timing, , if audio or changes, don't need update timing data.

edit

before play story, use enumeratesubstringsinrange:options:usingblock: find range of each word , store in array. use option nsstringenumerationbywords enumerate each word. block give range each word finds , can store in array.

when story plays, after each nstimer expiration (created array of word timings), highlight next word.

you use dispatch_after() instead of nstimer.