Ios UITextView';s NSTextContainer在文本视图高度NSLayoutConstraint更改上的位置错误
我将Ios UITextView';s NSTextContainer在文本视图高度NSLayoutConstraint更改上的位置错误,ios,iphone,uitextview,nstextcontainer,Ios,Iphone,Uitextview,Nstextcontainer,我将UITextView子类化,使其返回如下固有内容大小: - (void) layoutSubviews { [super layoutSubviews]; if (!CGSizeEqualToSize(self.bounds.size, [self intrinsicContentSize])) { [self invalidateIntrinsicContentSize]; } } - (CGSize)intrinsicContentSize {
UITextView
子类化,使其返回如下固有内容大小:
- (void) layoutSubviews
{
[super layoutSubviews];
if (!CGSizeEqualToSize(self.bounds.size, [self intrinsicContentSize])) {
[self invalidateIntrinsicContentSize];
}
}
- (CGSize)intrinsicContentSize
{
/*
Intrinsic content size of a textview is UIViewNoIntrinsicMetric
We have to build what we want here: contentSize + textContainerInset should do the trick
*/
CGSize intrinsicContentSize = self.contentSize;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0f) {
intrinsicContentSize.width += (self.textContainerInset.left + self.textContainerInset.right ) / 2.0f;
intrinsicContentSize.height += (self.textContainerInset.top + self.textContainerInset.bottom) / 2.0f;
}
return intrinsicContentSize;
}
我在UITextViewTextDidChangeNotification
中添加了一个观察者,当文本视图内容更改时,我会更新其高度,使其随文本高度增长:
- (void)textViewTextDidChangeNotification:(NSNotification *)notification
{
UITextView *textView = (UITextView *)notification.object;
[self.view layoutIfNeeded];
void (^animationBlock)() = ^
{
self.messageInputViewHeightConstraint.constant = MAX(0, self.messageInputView.intrinsicContentSize.height);
[self.view layoutIfNeeded];
};
[UIView animateWithDuration:0.3
delay:0
options:UIViewAnimationOptionCurveEaseInOut
animations:animationBlock
completion:nil];
}
但是,当它们的行数足以填充文本视图高度时,有一半的时间在添加新行时,UITextView的NSTextContainer没有像图中所示的那样放置良好
(NSTextContainer以红色勾勒,UITextView以蓝色勾勒)在添加新行的另一半时间内,NSTextContainer被正确替换 我没有发现如何解决这种奇怪的行为。
我希望你们中的一个人能找到解决办法
谢谢你你解决这个问题了吗?如果是的话,你是如何修复的?