i want to store the button in array - ios

Question

I am creating a nine button using for loop, i want to store the button in an array because i want to access all button at a time.
for(i = 0; i < 9; i++ )
{
num1 = [UIButton buttonWithType:UIButtonTypeCustom];
[num1 setExclusiveTouch:YES];
[num1 setTag:tag_start+i];
num1.tag = currentTag;
currentTag++;
[num1 setTitle:[NSString stringWithFormat:#"%d",currentTag] forState:UIControlStateNormal];
[num1 setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
[num1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[num1.titleLabel setFont:[UIFont fontWithName:#"Helvetica-Bold" size:35.0]];
//Store the button in array
[numBtnArray addObject:num1];
NSLog(#"%d", numBtnArray.count); //it show 0 nothing in that array
if(i >= 5) {
num1.frame = CGRectMake(430, i*60-160, 50, 50);
}
else {
num1.frame = CGRectMake(350, i*60+140, 50, 50);
}
[num1 addTarget:self action:#selector(buttonFunction:) forControlEvents:UIControlEventTouchUpInside];
[num1 setBackgroundImage:[UIImage imageNamed:#"greyBtn.png"] forState:UIControlStateNormal];
[num1 setBackgroundImage:[UIImage imageNamed:#"greyBtn.png"] forState:UIControlStateHighlighted];
[self.view addSubview:num1];
}

Answer 1

I don't understand what is the requirement but if you need to store them in an array simply do
NSMutableArray *btnArray = [NSMutableArray new];
for(i = 0; i < 9; i++ )
{
// ...
[btnArray addOjnect:num1];
[self.view addSubview:num1];
}

Answer 2

It's not clear exactly what you want, but I would encourage you not to store the buttons in an array at all, as the UIView already does that.
If you want to perform some sort of mass change to the buttons then you can, either:
Set a tag value in the button, so you can identify them later (with a minimum or maximum range).
Only target the buttons by testing their class.
So, if you want to change the background colour of the buttons in self.view, you simply:
for (id obj in self.view.subviews) {
if (![obj isKindOfClass:[UIButton class]])
continue;
UIButton *button = (UIButton *)obj;
button.backgroundColor = [UIColor blueColor];
}

Answer 3

Change the code as follows
numBtnArray = [[NSMutableArray alloc] init];
for(i = 0; i < 9; i++ ) {
UIButton *num1 = [UIButton buttonWithType:UIButtonTypeCustom];
//...
//Store the button in array
[numBtnArray addObject:num1];
NSLog(#"%d", numBtnArray.count);
//...
}