CODEWITHSUNDEEP
iosobjective-ccocoa-touch
shoujs
shoujs

Reputation: 1143

iOS: How to intercept touch event before UI element handle the event

In an iOS app, I press a button, then a popup menu shows. I want the popup menu being closed if I touch anywhere(a UITableView, other UIButton) in the screen outside of the menu. How can I intercept the touch event before the UI element(like UITableView, UIButton) on the screen handle the event, so I can close the menu programmatically?

I have tried -(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event in UIViewController, but it does not work. The UI element I touched will handle the event so I cannot intercept the event.

Upvotes: 0

Views: 1155

Answers (3)

Sulthan
Sulthan

Reputation: 130092

Add a transparent UIView covering your whole screen under the menu. Then handle only the taps to this view.

Upvotes: 3

Adam
Adam

Reputation: 51

You can add a UIGestureRecognizer to the main window and intercept the touch. If all you want is a tap then UITapGestureRecognizer should do the job.

If you are looking for any kind of touch then I would recommend using a custom GestureRecognizer which implements touchesBegan.

Upvotes: 0

Nirav Bhatt
Nirav Bhatt

Reputation: 6969

Set userInterActionEnabled Property of all views to NO while the menu is visible. Once discarded, set it to YES again.

- (void) enableOrDisableControlsExceptMenu : (UIView *) parentView :(bool) bEnabled
{
    for (UIView * view in parentView.subviews)
    {
       if (![view isKindOfClass:[YourMenu class])   //YourMenu is the menu view class
           view.userInterActionEnabled = bEnabled;
       [self enableOrDisableControlsExceptMenu : view :bEnabled];
    }
}

When the menu is visible, call the above method like:

[self enableOrDisableControlsExceptMenu:self.view :NO];

When the menu is discarded (invisible), call it like:

[self enableOrDisableControlsExceptMenu:self.view :YES];

Upvotes: 0

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