阻止一些数字键盘的数字，使其适应用户输入。

My app asks the user for a precise number of minutes which she/he inserts using a number pad keyboard. I'd like to block the keyboard's numbers >5 for the first number the user types (so that they can't type a number of minutes > 59). For the second number, I'd like it to unblock the previously blocked numbers so that the minutes can be precisely inserted (e.g. 18 or 59). Is there a way to do this? If so, how?My app asks the user for a precise number of mi