Keeping a UIButton selected after a touch

Question

After my user clicks a button, I\'d like that button to stay pushed during the time that I perform a network operation. When the network operation is complete, I want the bu

Answer 1

"Everything gets better when you turn power on"

    button.selected = !button.selected;

works perfectly... after I connected the outlet to the button in the Interface Builder.

You do not need to setBackgroundImage:forState:, the builder allows you to specify the background (gets resized if necessary) or/and foreground (not resizing) images.

Answer 2

In swift I'm doing it like the following.

I create a Subclass of UIButton and implemented a custom property state

class ActiveButton: UIButton {

    private var _active = false
    var active:Bool {
        set{
            _active = newValue
            updateState()
        }
        get{
            return _active
        }
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.addTarget(self, action: #selector(ActiveButton.touchUpInside(_:)), forControlEvents: .TouchUpInside)
    }

    func touchUpInside(sender:UIButton) {
        active = !active
    }

    private func updateState() {
        NSOperationQueue.mainQueue().addOperationWithBlock {
            self.highlighted = self.active
        }
    }

}

Works perfectly for me.

Answer 3

I have an easier way. Just use "performSelector" with 0 delay to perform [button setHighlighted:YES] . This will perform re-highlighting after the current runloop ends.

- (IBAction)buttonSelected:(UIButton*)sender {
    NSLog(@"selected %@",sender.titleLabel.text);
    [self performSelector:@selector(doHighlight:) withObject:sender afterDelay:0];
}

- (void)doHighlight:(UIButton*)b {
    [b setHighlighted:YES];
}