显示 iPhone 键盘时调整 UIView 大小，如何操作？

Question

我将向您展示一个众所周知的 Whatsapp 的例子 当您触摸文本内部时，键盘会弹出，因此我必须向上移动或移动所有栏并将视图大小调整为一半，这样我仍然可以看到我正在输入的文本和发送按钮

第一阶段： http://www.appbank.net/wp-content /uploads/2010/10/WhatsAppMessenger-18.jpg

第 2 阶段： http://www.onetooneglobal.com/wp-content/uploads /2011/02/onetoone_whatsapp_2.png

实现这一目标的最佳方法是什么？

Answer 1

#define kOFFSET_FOR_KEYBOARD 280.0

- (void)keyboardWillHide:(NSNotification *)notif {
    [self setViewMoveUp:NO];
}


- (void)keyboardWillShow:(NSNotification *)notif{
    [self setViewMoveUp:YES];
}


- (void)textFieldDidBeginEditing:(UITextField *)textField {
    stayup = YES;
    [self setViewMoveUp:YES];
}


- (void)textFieldDidEndEditing:(UITextField *)textField {
    stayup = NO;
    [self setViewMoveUp:NO];
}

//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMoveUp:(BOOL)moveUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view
    [UIView setAnimationBeginsFromCurrentState:YES];

    CGRect rect = self.view.frame;
    if (moveUp)
    {
        // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
        // 2. increase the size of the view so that the area behind the keyboard is covered up.

        if (rect.origin.y == 0 ) {
            rect.origin.y -= kOFFSET_FOR_KEYBOARD;
            //rect.size.height += kOFFSET_FOR_KEYBOARD;
        }

    }
    else
    {
        if (stayup == NO) {
            rect.origin.y += kOFFSET_FOR_KEYBOARD;
            //rect.size.height -= kOFFSET_FOR_KEYBOARD;
        }
    }
    self.view.frame = rect; 
    [UIView commitAnimations];
}

试试这个方法。根据您的要求进行编辑。

Answer 2

您需要听UIKeyboardDidShowNotification 和 UIKeyboardDidHideNotification，并在与您提供的选择器相对应的方法中通知中心随意调整视图大小（通常通过更改 UIView.frame 属性）