iOS 键盘显示事件处理
<p><p>我正在开发一个聊天应用程序，其中我有一个 TextView (不是文本字段)，当我点击它时，键盘应该显示并且所有内容都应该向上移动。</p>
<p>到目前为止，我已经设法将表格 View 和 TextView 的框架向上移动并使用以下代码显示键盘。</p>
<pre><code>- (void)keyboardWasShown:(NSNotification *)notification {
NSDictionary* info = ;
keyboardSize = [ CGRectValue].size;
CGPoint contentViewOrigin = self.contentView.frame.origin;
CGFloat contentViewHeight = self.contentView.frame.size.height;
CGRect visibleRect = self.view.frame;
visibleRect.size.height -= keyboardSize.height;
BOOL up = CGRectContainsPoint(visibleRect, contentViewOrigin);
if (!up){
self.tableView.frame = CGRectMake(self.tableView.frame.origin.x,self.tableView.frame.origin.y,self.tableView.frame.size.width,280.0f);
self.contentView.frame = CGRectOffset(self.contentView.frame, 0, 0 - keyboardSize.height);
if(!=0)
{
NSIndexPath* ip = -1 inSection:0];
;
}
}
}
- (void)keyboardWillBeHidden:(NSNotification *)notification {
self.contentView.frame = originalContentView;
self.tableView.frame = originalTable;
}
- (void)registerForKeyboardNotifications {
[ addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
[ addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)deregisterFromKeyboardNotifications {
[ removeObserver:self
name:UIKeyboardDidHideNotification
object:nil];
[ removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
</code></pre>
<p>但是当我看到 whatsapp 是如何做到的时，我的看起来就像一个黑客。 Whatsapp 的键盘与所有元素一起向上移动，而我的工作方式如下:首先显示键盘，向应用发送通知，收到通知，代码计算键盘高度并根据高度向上移动元素。 </p>
<p>我已经搜索并找到了我实现的解决方案。 </p>
<p>有人可以帮忙吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我在我的应用程序中经常使用这个技巧。你想听 <code>UIKeyboardWillShowNotification</code> 和 <code>UIKeyboardWillHideNotification</code>。
在我看来，处理动画的最佳方式是使用自动布局。当你调用 ;您的 View 将与键盘动画一起移动。不需要动画 block 。 </p>
<p>我设置了一个简单的 <a href="https://github.com/NKorotkov/KeyboardNotificationsFun" rel="noreferrer noopener nofollow">project</a>任何人都可以尝试看看它是如何工作的!</p>
<pre><code>- (void)addKeyboardNotificationsObserver {
[ addObserver:self
selector:@selector(handleKeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[ addObserver:self
selector:@selector(handleKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)handleKeyboardWillShow:(NSNotification *)paramNotification
{
NSDictionary* info = ;
//when switching languages keyboard might change its height (emoji keyboard is higher than most keyboards).
//You can get both sizes of the previous keyboard and the new one from info dictionary.
// size of the keyb that is about to disappear
CGSize kbSize = [ CGRectValue].size;
// size of the keyb that is about to appear
CGSize kbSizeNew = [ CGRectValue].size;
//make adjustments to constraints here...
//and here where's magick happen!
;
}
- (void)handleKeyboardWillHide:(NSNotification *)paramNotification
{
//adjust constraints
;
}
</code></pre></p>
<p style="font-size: 20px;">关于iOS 键盘显示事件处理，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/30664160/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/30664160/
</a>
</p>
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