不完整的实现xcode按钮禁用按钮

I am new to Objective C and Xcode so please be patient with me!! I have written a program that controls 5 buttons and 1 reset button. If any of the 5 buttons are pressed, they should all be disabled (greyed out) until the reset button is pressed. Here is my attempt:I am new to Objective C and Xcode so please be