我需要在即将进行的项目中添加聊天功能。
与此同时，我一直在尝试实现我期望的简单事情，即在屏幕底部有一个 UIView，里面有一个 UITextView，当用户点击 UITextView 时，它会随键盘一起动画.
我有它的工作，但不幸的是，键盘的动画稍微落后于它上面的 View 。到目前为止，这是我的实现:
注册键盘通知:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
键盘通知方式:
- (void)keyboardWillShow:(NSNotification*)notification
{
CGFloat duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
NSInteger curve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
[UIView animateWithDuration:duration delay:0 options:curve animations:^{
CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
_chatViewBottomConstraint.constant = keyboardFrame.size.height;
[self.view layoutIfNeeded];
} completion:nil];
}
有没有其他人做过类似的，并且能够为我提供更好的解决方案？
这对我有用:
- (void)keyboardWillShow:(id)keyboardDidShow
{
[UIView beginAnimations:nil context:NULL];
NSDictionary *userInfo = [keyboardDidShow userInfo];
[UIView setAnimationDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
[self.view layoutIfNeeded];
[UIView commitAnimations];
}
- (void)keyboardWillHide:(id)keyboardDidHide
{
[UIView beginAnimations:nil context:NULL];
NSDictionary *userInfo = [keyboardDidHide userInfo];
[UIView setAnimationDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
[self.view layoutIfNeeded];
[UIView commitAnimations];
}
更新:
或者你可以对 block 做同样的事情:
- (void)keyboardWillShow:(id)keyboardDidShow
{
NSDictionary *userInfo = [keyboardDidShow userInfo];
[UIView animateWithDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]
delay:0.f
options:[[keyboardDidShow userInfo][UIKeyboardAnimationCurveUserInfoKey] intValue] << 16
animations:^{
...
} completion:^(BOOL finished) {
...
}];
}
- (void)keyboardWillHide:(id)keyboardDidHide
{
NSDictionary *userInfo = [keyboardDidHide userInfo];
[UIView animateWithDuration:[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]
delay:0.f
options:[[keyboardDidHide userInfo][UIKeyboardAnimationCurveUserInfoKey] intValue] << 16
animations:^{
...
} completion:^(BOOL finished) {
...
}];
}