scrollToTop is not working on iPhone but it is working on iPad

Question

I have two view controller. One scrollview for page control and one for detail (scroll vertical).

When i click status bar on iPhone the scrollToTop not working, and in iPad the scrollToTop is working.

I am sure that the scrollView.scrollToTop is YES. because i already print it.

Anyone know what cause the iPhone scrollToTop not working?

Thank you

Edit: I try by calling the scrollView delegate. in iPad this delegate its called. - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

in iPhone it is not called. I already use both contentScrollView.delegate = self; But the iphone not working :(

Edit: Try subclassing UIWindow (not working)

Window.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface Window : UIWindow
@end

Window.m

 #import "Window.h"

 @implementation Window

 - (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if ([event type] == UIEventTypeTouches && point.y < 250) {
    //Send Your Notification Here
    NSLog(@"KAROOO");
}
NSLog(@"HELLOWW");
return [super hitTest:point withEvent:event];
}
@end

AppDelegate.h

@property (nonatomic, strong) IBOutlet Window *window;

AppDelegate.m

@synthesize window = _window;

Answer 1

From what I understand you have 2 UIScrollViews simultaneously on screen.

From what I have seen & experienced, On iOS 4 having 2 UIScrollViews side by side gives undefined behaviour. One of the scrollview may scroll, sometimes other, sometimes neither.

On iOS 5 if you have 2 UIScrollViews side by side then tapping on status bar "scrolls to top" the UIScrollView right "under your tap"

I don't know how this works, but this has been my observation. iOS 5 is smart !!

If your UIScrollViews are one above other then probably the behaviour is undefined. I haven't checked.

Hope this helps.

If you want to get it working anyways then here is a possible solution.

Subclass or Add a category on UIWindow and add a gesture recognizer / or implement hitTest that detects tap only for Y < 20 and so on and then have it send a notification and listen to this in your viewController and programmatically scroll the UIScrollView to top.

EDIT

Implement this in the UIWindow subclass (iPad)

- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if ([event type] == UIEventTypeTouches && point.y < 20 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait) {
        NSLog(@"Portrait");
    } else if ([event type] == UIEventTypeTouches && point.y > 1004 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown) {
        NSLog(@"PortraitUpsideDown");
    } else if ([event type] == UIEventTypeTouches && point.x < 20 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeLeft) {
        NSLog(@"LandscapeLeft");
    } else if ([event type] == UIEventTypeTouches && point.x > 748 && [[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationLandscapeRight) {
        NSLog(@"LandscapeRight");
    }
    return [super hitTest:point withEvent:event];
}