ios - 出现键盘时缩小 UIWebView

Question

在我的 iPhone 应用程序上，我有一个 UIWebView，上面和下面都有工具栏。底部的工具栏包含一个文本框，供用户输入一些文本。但是当我点击文本框时，键盘会覆盖屏幕的下半部分。

如何使工具栏保持在 webview 的上方和下方，但 webview 的高度会缩小以显示键盘？

感谢任何关于此的指导。

提前致谢。

Answer 1

要缩小 webView，您需要以下内容:

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

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

- (void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}


- (void)keyboardWillShow:(NSNotification *)notification
{    
    CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    keyboardFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    NSTimeInterval keyboardAnimationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationOptions keyboardAnimationCurve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue] << 16;

    CGFloat keyboardHeight = keyboardFrame.size.height;

    [UIView animateWithDuration:keyboardAnimationDuration delay:0 options:keyboardAnimationCurve 
    animations:^{
            _webView.contentInset = UIEdgeInsetsMake(0, 0, keyboardHeight, 0)
    }
    completion:NULL];
}


- (void)keyboardWillHide:(NSNotification *)notification
{    
    NSTimeInterval keyboardAnimationDuration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    UIViewAnimationOptions keyboardAnimationCurve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue] << 16;

    [UIView animateWithDuration:keyboardAnimationDuration delay:0 options:keyboardAnimationCurve 
    animations:^{
            _webView.contentInset = UIEdgeInsetsZero;
    }
    completion:NULL];
}

如果有其他 subview ，您应该稍微更改此代码(添加其他 subview 的框架更改)