Add effect for buttons - ios

Question

I have an app like Hangman, the difference is that in my app the letters chosen are in order, not on the right space .
-(void)MatchedWordClick:(id)sender{
UIButton *bt = (UIButton*)sender;
[bt setTitle:#"" forState:UIControlStateNormal];
((UIButton*)[PuzzleView viewWithTag:[[[lstWordToMatch objectAtIndex:nCurrentWord]objectAtIndex:bt.tag-200] integerValue]+100]).hidden = FALSE;
[[lstWordToMatch objectAtIndex:nCurrentWord]replaceObjectAtIndex:bt.tag-200 withObject:[NSString stringWithFormat:#"%d",-1]];
}
-(void)PuzzleWordClick:(id)sender{
//AudioServicesPlaySystemSound(sound1);
UIButton *bt = (UIButton*)sender;
int nIndex = -1;
for (int i = 0; i< [[lst_word objectAtIndex:nCurrentWord]length]; i++) {
UIButton *bt1 = (UIButton*)[self.view viewWithTag:200+i];
if ([bt1.currentTitle isEqualToString:#""]||bt1.currentTitle == nil) {
nIndex = i;
break;
}
}
if (nIndex == -1) {
NSLog(#"You Macthed Already");
}else{
bt.hidden = TRUE;
[[lstWordToMatch objectAtIndex:nCurrentWord]replaceObjectAtIndex:nIndex withObject:[NSString stringWithFormat:#"%d",bt.tag-100]];
[((UIButton*)[self.view viewWithTag:200+nIndex])setTitle:bt.titleLabel.text forState:UIControlStateNormal];
}
int nCount = 0;
for (int i = 0; i< [[lst_word objectAtIndex:nCurrentWord]length]; i++) {
UIButton *bt1 = (UIButton*)[self.view viewWithTag:200+i];
if ([bt1.currentTitle isEqualToString:#""]||bt1.currentTitle == nil) {
nCount++;
}
}
if (nCount == 0) {
NSString *strWord = #"";
for (int i = 0; i<[[lst_word objectAtIndex:nCurrentWord]length]; i++) {
UIButton *bt1 = (UIButton*)[self.view viewWithTag:200+i];
strWord = [NSString stringWithFormat:#"%#%#",strWord,bt1.currentTitle];
}
if (![strWord isEqualToString:[lst_word objectAtIndex:nCurrentWord]]) {
MatchView.userInteractionEnabled = FALSE;
PuzzleView.userInteractionEnabled = FALSE;
ErrorAlertView.hidden = FALSE;
// AudioServicesPlaySystemSound(sound3);
}else{
if (nCurrentWord == 0) {
//// Change Points Value
if ([[lst_word objectAtIndex:nCurrentWord] length] == 3) {
[lblPts setText:[NSString stringWithFormat:#"%d", nPoint+5]];//point value
}else if ([[lst_word objectAtIndex:nCurrentWord] length] == 4) {
[lblPts setText:[NSString stringWithFormat:#"%d", nPoint+10]];
}else if ([[lst_word objectAtIndex:nCurrentWord] length] >= 5) {
[lblPts setText:[NSString stringWithFormat:#"%d", nPoint+15]];
}
[self drawSuccessView];
}else{
nCurrentWord++;
[self drawPuzzle:nCurrentWord];
}
}
}
}
This code is working to select a letter and complete the word, it also works if I want to erase the letter and put it back .
I want that when I select a letter (from puzzle or from word) to add an effect like fly when a letter is put back or in the word.
I want something like this effect but I don't know how to do it in this case.
int z=40 + random() % 9;
int w=40+ random() % 9;
[UIView animateWithDuration:0.5 animations:^{
self.label13.frame = CGRectMake(-z,-200, 25, 25);
NSLog(#"aaa");
}];