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iOS 键盘显示事件处理

转载 作者:塔克拉玛干 更新时间:2023-11-02 09:40:35 27 4
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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。

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。

- (void)keyboardWasShown:(NSNotification *)notification {

NSDictionary* info = [notification userInfo];

keyboardSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] 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([self.tableView numberOfRowsInSection:0]!=0)
{
NSIndexPath* ip = [NSIndexPath indexPathForRow:[self.tableView numberOfRowsInSection:0]-1 inSection:0];
[self.tableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionBottom animated:UITableViewRowAnimationLeft];
}


}

}

- (void)keyboardWillBeHidden:(NSNotification *)notification {

self.contentView.frame = originalContentView;
self.tableView.frame = originalTable;
}


- (void)registerForKeyboardNotifications {

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification
object:nil];

}

- (void)deregisterFromKeyboardNotifications {

[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardDidHideNotification
object:nil];

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

}

但是当我看到 whatsapp 是如何做到这一点时,我的看起来就像一个 hack。 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,向应用程序发送通知,收到通知,代码计算键盘的高度并根据高度向上移动元素。

我已经搜索并找到了我已经实现的解决方案。

有人可以帮忙吗??

最佳答案

我在我的应用程序中经常使用这个技巧。您想收听 UIKeyboardWillShowNotificationUIKeyboardWillHideNotification。在我看来,处理动画的最佳方式是使用自动布局。当你调用 [self.view layoutIfNeeded];您的 View 将随着键盘动画一起移动。不需要动画 block 。

我设置了一个简单的 project任何人都可以尝试看看它是如何工作的!

- (void)addKeyboardNotificationsObserver {

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleKeyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleKeyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

}

- (void)handleKeyboardWillShow:(NSNotification *)paramNotification

{

NSDictionary* info = [paramNotification userInfo];

//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 = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

// size of the keyb that is about to appear
CGSize kbSizeNew = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

//make adjustments to constraints here...

//and here where's magick happen!

[self.view layoutIfNeeded];

}

- (void)handleKeyboardWillHide:(NSNotification *)paramNotification

{
//adjust constraints

[self.view layoutIfNeeded];

}

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: https://stackoverflow.com/questions/30664160/

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