Easier way to change all the buttons?
b1.backgroundColor = [UIColor redColor];
b2.backgroundColor = [UIColor redColor];
b3.backgroundColor = [UIColor redColor];
b4.backgroundColor = [UIColor redColor];
b5.backgroundColor = [UIColor redColor];
b6.backgroundColor = [UIColor redColor];
b7.backgroundColor = [UIColor redColor];
b8.backgroundColor = [UIColor redColor];
b9.backgroundColor = [UIColor redColor];
b10.backgroundColor = [UIColor redColor];

//Make an array of the buttons:
NSArray* buttons=[[NSArray alloc] initWithObjects:b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,nil];
//Loop through them
for(UIButton* b in buttons)
{
  b.backgroundColor = [UIColor redColor];
}

NSArray* buttonArray=[[NSArray alloc] initWithObjects:b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,nil];

[buttonArray makeObjectsPerformSelector:@selector(setBackgroundColor:) withObject:[UIColor redColor]];