How do you send a message to a button from different views?

I have an app that has a main view that acts as a view controller. This main view has 3 buttons on it.开发者_StackOverflow社区 I have 3 subviews that I swap in and out of this main view, controlled by the 3 buttons. Each of the subviews has a button on it. When this button is pressed I want it to disable the 3 buttons on the main view until the button is pressed again. Is there a way to send a message between the views to disable the buttons?

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This sounds like a toggle to me. More like a setting. If you think about it, this should go in NSUserDefaults. And when you that particular view is coming on, probably in viewWillAppear: or viewDidAppear:, do this,

BOOL controlsEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:@"ControlsEnabledKey"];

button1.enabled = controlsEnabled;
button2.enabled = controlsEnabled;
button3.enabled = controlsEnabled;

To save the value on that button press,

BOOL controlsEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:@"ControlsEnabledKey"];

[[NSUserDefaults standardUserDefaults] setBool:!controlsEnabled forKey:@"ControlsEnabledKey"];
[[NSUserDefaults standardUserDefaults] synchronize];

note Since the boolForKey: will return NO if the key is not found, I suggest you set the value to YES when the application starts if you want the controls to be enabled at launch.

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Use NSNotifications to post a notification that the buttons were pressed.

 [[NSNotificationCenter defaultCenter] postNotificationName:@"Button1Pressed" object:self userInfo:info];

And then add observers such that they listen to these notifications.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(buttonPress:) name:@"Button1Pressed" object:nil];

Now implement buttonPress

Read HERE for the NSNotification manual and learn to use it .

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Set the main view/controller as the delegate of the inner views, define a protocol in which you define a method, say, toggleMainButtons, have the VC conform to that protocol and implement the message. On the buttons, addTarget:self.delegate action:@selector(toggleMainButtons) forControlEvents:UIControlEventTouchUpInside.