UIScrollView subclass and custom delegate: detect scroll events on the subclass and on the delegate

Question

I'm creating an UIScrollView subclass. On this subclass, I need to detect the scroll events, but I also want to enable the detection of scroll events on a delegate. Also, this UIScrollView subclass needs a custom delegate.

// CustomScrollView.h
#import <UIKit/UIKit.h>
#import "CustomScrollViewDelegate.h"

@interface CustomScrollView : UIScrollView <UIScrollViewDelegate> {
    ...
}

@property (nonatomic, assign) id <DAGridViewDelegate> delegate;

...

@end

// CustomScrollView.m
#import "DAGridView.h"

@implementation DAGridView

@synthesize delegate;

- (id)init {
    self = [super init];
    if (self) {
        ...
    }
    return self;
}

...

@end

// CustomScrollViewDelegate.h

@class CustomScrollViewDelegate

@protocol CustomScrollViewDelegate <NSObject, CustomScrollViewDelegate>

...

@end

Thanks for helping!!

If you need some more information, comment!!

score 0 · Accepted Answer · answered May 27 '12 at 13:13

well, you can simply state in the init

self.delegate = self; // to have your custom scroll view as its own delegate

and rename your custom delegate of the new protocol you are implementing as CustomDelegate to avoid problem

then you must ovveride each method the scroll view calls and in each method add something like

[customDelegate ovveriddenScrollviewDelegateMethod];

The you implement in your class which will be the customDelgate,

<UIScrollViewDelegate, CustomScrollViewDelegate>

and implement enverything.

UIScrollView subclass and custom delegate: detect scroll events on the subclass and on the delegate

1 Answers1