How to disable multitouch?

- (void)viewDidLoad {
    [super viewDidLoad];

    for(UIView* v in self.view.subviews)
    {
        if([v isKindOfClass:[UIButton class]])
        {
            UIButton* btn = (UIButton*)v;
            [btn setExclusiveTouch:YES];
        }
    }
}

If you want only one button to respond to touches at a time, you need to set exclusiveTouch for that button, rather than for the parent view. Alternatively, you could disable the other buttons when a button gets the "Touch Down" event.

---

Here's an example of the latter, which worked better in my testing. Setting exclusiveTouch for the buttons kind-of worked, but led to some interesting problems when you moved your finger off the edge of a button, rather than just clicking it.

You need to have outlets in your controller hooked up to each button, and have the "Touch Down", "Touch Up Inside", and "Touch Up Outside" events hooked to the proper methods in your controller.

#import "multibuttonsViewController.h"

@implementation multibuttonsViewController

// hook this up to "Touch Down" for each button
- (IBAction) pressed: (id) sender
{
    if (sender == one)
    {
        two.enabled = false;
        three.enabled = false;
        [label setText: @"One"]; // or whatever you want to do
    }
    else if (sender == two)
    {
        one.enabled = false;
        three.enabled = false;
        [label setText: @"Two"];  // or whatever you want to do
    }
    else
    {
        one.enabled = false;
        two.enabled = false;
        [label setText: @"Three"];  // or whatever you want to do
    }
}

// hook this up to "Touch Up Inside" and "Touch Up Outside"
- (IBAction) released: (id) sender
{
    one.enabled = true;
    two.enabled = true;
    three.enabled = true;
}

@end

- (void)viewDidLoad {
    [super viewDidLoad];

    for(UIView* v in self.view.subviews)
    {
        if([v isKindOfClass:[UIButton class]])
        {
            UIButton* btn = (UIButton*)v;
            [btn setExclusiveTouch:YES];
        }
    }
}

This code is tested and working perfectly for me.there is no app crash when pressing more than one button at a time.

Your app crashes for a reason. Investigate further, use the debugger, see what's wrong instead of trying to hide the bug.

Edit:

OK, ok, I have to admit I was a bit harsh. You have to set the exclusiveTouch property on each button. That's all. The multipleTouchEnabled property is irrelevant.