iOS7 UISwitch its Event ValueChanged: Calling continuously is this Bug or what..?

Please see the following code:

-(void)viewDidLoad{    [super viewDidLoad];        UISwitch *mySwitch = [[UISwitch alloc] initWithFrame:CGRectMake(130, 235, 0, 0)];        [mySwitch addTarget:self action:@selector(changeSwitch:) forControlEvents:UIControlEventValueChanged];    [self.view addSubview:mySwitch];}- (void)changeSwitch:(id)sender{    if([sender isOn]){        NSLog(@"Switch is ON");    } else{        NSLog(@"Switch is OFF");    }}

Same bug here. I think I've found a simple workaround. We just have to use a new BOOL that stores the previous state of the UISwitch and an if statement in our IBAction (Value Changed fired) to check that the value of the switch has actually changed.

previousValue = FALSE;[...]-(IBAction)mySwitchIBAction {    if(mySwitch.on == previousValue)        return;    // resetting the new switch value to the flag    previousValue = mySwitch.on; }

No more weird behaviors. Hope it helps.

You can use the UISwitch's .selected property to make sure your code only executes once when the value actual changes. I think this is a great solution because it avoids having to subclass or add new properties.

 //Add action for `ValueChanged` [toggleSwitch addTarget:self action:@selector(switchTwisted:) forControlEvents:UIControlEventValueChanged]; //Handle action- (void)switchTwisted:(UISwitch *)twistedSwitch{    if ([twistedSwitch isOn] && (![twistedSwitch isSelected]))    {        [twistedSwitch setSelected:YES];        //Write code for SwitchON Action    }    else if ((![twistedSwitch isOn]) && [twistedSwitch isSelected])    {        [twistedSwitch setSelected:NO];        //Write code for SwitchOFF Action    }}

And here it is in Swift:

func doToggle(switch: UISwitch) {    if switch.on && !switch.selected {        switch.selected = true        // SWITCH ACTUALLY CHANGED -- DO SOMETHING HERE    } else {        switch.selected = false    }}