How to get a UIView object to communicate with a ViewController object - ios

Question

I'm working on an iPhone app in StoryBoard. It has a UIScrollView in it. Inside of this, it has a SliderView, which is a custom subclass that I wrote that derives from UIView.
Inside SliderView I'm executing this method:
// Inside SliderView.m
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// whenever someone touches inside of SliderView, this method fires
}
Here's my problem. In my StoryBoard, I would like to disable the bouncy vertical scrolling of the UIScrollView.
Normally, that would be easy. Assuming I had connected the UIScrollView as an IBOutlet in the app's main ViewController, I could paste this into that file:
// Inside ViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
self.scrollView.bounces = NO;
}
Unfortunately, this isn't so easy because I want this disabling to occur only when touchesBegan is fired.
So here's where I'm completely stumped: how can I get the SliderView.m file to communicate with the ViewController.m file?

Answer 1

Use delegate for this:
SliderView.h
// SliderView.h
#protocol SliderViewDelegate <NSObject>
#optional
- (void) isScrollViewToBounce:(BOOL)isBounce;
#end
#interface SliderView : UIView
#property (nonatomic, weak) id <SliderViewDelegate> sliderViewDelegate;
#end
SliderView.m
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.sliderViewDelegate isScrollViewToBounce:NO];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self.sliderViewDelegate isScrollViewToBounce:YES];
}
ViewController.m
#import "SliderView.h"
#interface ViewController () <SliderViewDelegate>
#end
viewDidLoad() method
- (void)viewDidLoad {
[super viewDidLoad];
self.sliderView setSlideViewDelegate:self];
}
Create Delegate method in your ViewController:
- (void) isScrollViewToBounce:(BOOL)isBounce {
self.scrollView.bounces = isBounce;
}
Also do not forget to remove delegation
#pragma mark Memory management methods
//---------------------------------------------------------------
- (void)dealloc {
// Release resources here.
[self.scrollView setSliderViewDelegate:nil]
}