User defined iOS interface - objective-c

Question

Introduction
I am writing an app where the interface on a screen can vary depending on user input on the previous screen. What I'm trying to do right now is load up x amount of sliders, where I get x from the previous screen. The real issue I'm having is won't each slider I use have to be named and defined? I've thought of a way to do this but I'm not entirely sure how to implement if you could advise me it would really be appreciated
Pseudo Code
-(void) loadInterface {
// Set up a frame
CGRect myFrame = CGRectMake(10.0f, 100.0f, 250.0f, 25.0f);
for (int i = 0; i < x; i++) {
[self newSlider]
// Retrieve info here about the slider and pass it to newSlider
}
}
-(void) newSlider (info about slider) {
// Here I need the code to load a slider
// If I use something like this:
// UISlider *slider1 = [[UISlider alloc] initWithFrame:myFrame];
// The next time this method is loaded the slider will be overwritten right?
}

Answer 1

You could use an NSMutableDictionary to keep track of all your sliders, although maybe you do not need that at all.
In newSlider you create a slider and you should add it to some view (I assume self) through
[self addSubview:slider];
All sliders thus created will appear at the position where you created them and will not disappear unless you remove them from the view.
You could take this snippet as an example of how you can create a slider:
CGRect frame = CGRectMake(0.0, 0.0, 200.0, 10.0);
UISlider *slider = [[UISlider alloc] initWithFrame:frame];
[slider addTarget:self action:#selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
If you define correctly frame, you can make all of your sliders align nicely in your UI.
When a slider action is carried through by the user, the sliderAction: method is called, which has an argument referring to the slider:
- (void)sliderAction:(UISlider* slider) {
...
}
so you know exactly which slider was actioned and this is generally enough to handle the action.
In any case, as I said, if you want to keep track of all the sliders, add them to a NSDictionary at the moment of creation:
[self.sliderDict setObject:newSlider forKey:#"nth-slider-name"];

Answer 2

You don't need new variables for each slider, because the scope of the UISlider instance you use in your newSlider method is limited to that method. Meaning the variable will be free for use once the program exits the method.
You should also pass which slider it is to that method, this can then be used to position it and to give the view a tag for later use:
-(void) loadInterface {
// Set up a frame
CGRect myFrame = CGRectMake(10.0f, 100.0f, 250.0f, 25.0f);
for (int i = 0; i < x; i++) {
[self newSlider:i]
// Retrieve info here about the slider and pass it to newSlider
}
}
-(void) newSlider:(int)sliderNumber {
UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(0, sliderNumber * 100, 320, 50)];
slider.tag = sliderNumber;
[self.view addSubview:slider];
}