UIButton touch is delayed when in UIScrollView

Question

I\'m running into a small issue in my app.

I essentially have a series of UIButtons added as subviews in a UIScrollView which is part of a

Answer 1

Swift 3 :

scrollView.delaysContentTouches = false

Answer 2

In Swift 3:

import UIKit

class ScrollViewWithButtons: UIScrollView {

    override init(frame: CGRect) {
        super.init(frame: frame)
        myInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        myInit()
    }

    private func myInit() {
        self.delaysContentTouches = false
    }

    override func touchesShouldCancel(in view: UIView) -> Bool {
        if view is UIButton {
            return true
        }
        return super.touchesShouldCancel(in: view)
    }
}

You can then use this ScrollViewWithButtons in IB or in code.

Answer 3

Ok I've solved this by subclassing UIScrollView and overriding touchesShouldCancelInContentView

Now my UIButton that was tagged as 99 highlights properly and my scrollview is scrolling!

myCustomScrollView.h:

@interface myCustomScrollView : UIScrollView  {

}

@end

and myCustomScrollView.m:

@implementation myCustomScrollView

    - (BOOL)touchesShouldCancelInContentView:(UIView *)view
    {
        NSLog(@"touchesShouldCancelInContentView");

        if (view.tag == 99)
            return NO;
        else 
            return YES;
    }

Answer 4

None of the existing solutions worked for me. Maybe my situation is more unique.

I have many UIButtons within a UIScrollView. When a UIButton is pressed a new UIViewController is presented to the user. If a button is pressed and held long enough, the button will show its depressed state. My client was complaining that if you tap too quickly, no depressed state is shown.

My solution: Inside the UIButtons' tap method, where I load the new UIViewController and present it on screen, I use

[self performSelector:@selector(loadNextScreenWithOptions:) 
           withObject:options 
           afterDelay:0.]

This schedules the loading of the next UIViewController on the next event loop. Allowing time for the UIButton to redraw. The UIButton now shows its depressed state before loading the next UIViewController.

Answer 5

Try to set UIScrollView delaysContentTouches property to NO.

Answer 6

Jeff's solution wasn't quite working for me, but this similar one does: http://charlesharley.com/2013/programming/uibutton-in-uitableviewcell-has-no-highlight-state

In addition to overriding touchesShouldCancelInContentView in your scroll view subclass, you still need to set delaysContentTouches to false. Lastly, you need to return true rather than false for your buttons. Here's a modified example from the above link. As commenters suggested, it checks for any subclass of UIControl rather than UIButton specifically so that this behavior applies to any type of control.

Objective-C:

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.delaysContentTouches = false;
    }

    return self;
}

- (BOOL)touchesShouldCancelInContentView:(UIView *)view {
    if ([view isKindOfClass:UIControl.class]) {
        return true;
    }

    return [super touchesShouldCancelInContentView:view];
}

Swift 4:

override func touchesShouldCancel(in view: UIView) -> Bool {
    if view is UIControl {
        return true
    }
    return super.touchesShouldCancel(in: view)
}