我正在使用一个聊天应用程序，其中有一个textview（不是textfield），当我单击它时，键盘应该会显示并且一切都应该向上移动。
到目前为止，我已经设法将表格视图和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的工作方式时，我的样子就像是骇客。Whatsapp的键盘和所有元素一起向上移动，而我的工作方式是这样的：首先显示键盘，向应用程序发送通知，接收到通知，代码计算键盘的高度，然后根据高度向上移动元素。
我搜索并找到了已实施的解决方案。
有人可以帮忙吗？
我在我的应用程序中经常使用此技巧。您想听UIKeyboardWillShowNotification和UIKeyboardWillHideNotification。我认为处理动画的最佳方法是使用自动布局。当您调用[self.view layoutIfNeeded]时；您的视图将随键盘动画一起移动。不需要动画块。
我已经建立了一个简单的项目，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];
}
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我来说两句