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UISwitch - end animation detection

I have UISwitch

one that is inside UITableViewCell

. I have a target action assigned to toggle:

[switch addTarget:self action:@selector(changeSwitchColor:) forControlEvents:UIControlEventValueChanged];

- (void)changeSwitchColor:(id)sender
{
    ...
}

The problem is what changeSwitchColor:

is called before the animation finishes, but I want to detect when the animation is finished, so I can set the property thumbTintColor

without breaking the animation.

My attempt at detecting animation using the method UIView

setAnimationDidStopSelector:

:

[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
    ...
}

But this method is not called when UISwitch

the animation ends (I'm not even sure how the animation is done internally).

How to determine the completion status UISwitch

?

Thank!

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1 answer


You can use CATransaction.setCompletionBlock(_:)

.

addTarget(self, action: #selector(valueChanged(sender:)), for: [.valueChanged])

@objc private func valueChanged(sender: UISwitch) {
    CATransaction.setCompletionBlock { [onChange] in
        onChange?(sender.isOn)
    }
}


The documentation says that the block is guaranteed to be called even if there is no animation or the animation has been removed. This makes it very safe to use.

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