(ios) nsnotification總結

1  文本輸入，鍵盤顯示時，view向上，鍵盤隱藏時，view向下

1.1 註冊鍵盤顯示，關閉通知，並實現主界面上下變更

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}


-(void)keyboardWillShow:(NSNotification *)aNotification
{

    CGRect keyBoardRect=[[[aNotification userInfo]objectForKey:UIKeyboardFrameBeginUserInfoKey]CGRectValue];
    
    NSTimeInterval animalInterval=[[[aNotification userInfo]objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect frame=self.view.frame;
    frame.origin.y=-keyBoardRect.size.height;
    [UIView beginAnimations:@"keyboardshow" context:nil];
    [UIView setAnimationDuration:animalInterval];
    self.view.frame=frame;
    [UIView commitAnimations];


}

-(void)keyboardWillHide:(NSNotification *)aNotification
{

    NSTimeInterval animalInterval=[[[aNotification userInfo]objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect frame=self.view.frame;
    frame.origin.y=0;
    [UIView beginAnimations:@"keyboardhide" context:nil];
    [UIView setAnimationDuration:animalInterval];
    self.view.frame=frame;
    [UIView commitAnimations];
    
}

1.2 文本框初始化，並實現UITextViewDelegate委託

    self.textbox.returnKeyType=UIReturnKeyDone;
    self.textbox.delegate=self;
}

 - (BOOL)textFieldShouldReturn:(UITextView *)textView
{
 [textView resignFirstResponder];
    return YES;
}

 

2 自定義notification

 2.1 定義偵聽自定義notification觀察者

//註冊觀察者，偵聽自定義通知
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(selfNotificationDO:) name:@"CustomNotification" object:nil];

}

-(void)selfNotificationDO:(NSNotification *)aNotification
{
     //處理notification
    //........
}

2.2 生成一個自定義notification

//生成一個自定義Notification
    [[NSNotificationCenter defaultCenter] postNotificationName:@"CustomNotification" object:self];