I am doing one project of handling task of the day like taking notes.
So I assign daily task to do and when task is done I want one line strike through the task name.
If you use another simple idea its work fine and also very easy....
just add another lable above your lable and lable code is
UILabel *canceledlable = [[UILabel alloc] initWithFrame:yourmainlableframe];
canceledlable.opaque = YES;
canceledlable.backgroundColor = [UIColor clearColor];
canceledlable.text = @"------------------------------------------------";
canceledlable.lineBreakMode = UILineBreakModeClip;
[self.view addSubview: canceledlable];
here which lable want you strikethrough font just give its frame to here and add this lable when your task is done Hope,this help you...... :)