方法完成后执行代码

Question

I need to execute some code after I know the keyboard is hidden.

Ive been looking in to blocks but I'm just not understanding how they work enough to do this...

All I want to do is run [self hidekeyboard] then when that is complete (and the keyboard fully hidden) then I want to call a delegate.

What is the best way to handle this and how?

Answer 1

You want to use the UIKeyboardDidHide notification and run your code in there. Here is the link in the docs...

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html

Answer 2

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(onKeyboardDidHide:) name: UIKeyboardDidHideNotification object:nil];

And the onKeyboardDidHide :

-(void)onKeyboardDidHide:(NSNotification *)notification
{
     // execute what you want.
}

Answer 3

Register a listener for the UIKeyboardDidHideNotification using the NSNotificationCenter class.

[[NSNotificationCenter defaultCenter]
    addObserver:self
       selector:@selector(keyboardHidden:)
           name:UIKeyboardDidHideNorification
         object:nil];

- (void)keyboardHidden:(NSNotification *)notif
{
     // do stuff
}

(Don't forget to remove the observer in - dealloc so that no messages will erroneously be sent to deallocated objects.)

Answer 4

You probably want to register to receive notifications of UIKeyboardDidHideNotification.

http://developer.apple.com/library/ios/#documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html