我正在根据内容&也是兄弟姐妹和父母容器.
以下代码在iOS 6中正常工作
if (/* less than ios 7 */) {
CGRect frame = _textView.frame;
CGSize conSize = _textView.contentSize;
CGFloat difference = conSize.height - frame.size.height;
frame.size.height += difference;
_textView.frame = frame;
UIScrollView *parentView = (UIScrollView *)_textView.superview;
// adjust views residing below this text view.
// sibling view
UIView *belowView = // access it somehow
CGRect frame1 = belowView.frame;
frame1.origin.y += difference;
belowView.frame = frame1;
// adjust parent scroll view,increase height.
CGSize frame3 = parentView.contentSize;
frame3.height += difference;
parentView.contentSize = frame3;
} else {
// tried
[_textView sizeToFit];
[_textView layoutIfNeeded];
[parentView sizeToFit];
[parentView layoutIfNeeded];
}
试图遵循iOS 7解决方案：
How do I size a UITextView to its content on iOS 7?
但不工作.
任何指针？
if (/* ios 7 */) {
[_textView.layoutManager ensureLayoutForTextContainer:_textView.textContainer];
[_textView layoutIfNeeded];
}
CGRect frame = _textView.frame;
CGSize conSize = _textView.contentSize;
CGFloat difference = conSize.height - frame.size.height;
frame.size.height += difference;
_textView.frame = frame;
UIScrollView *parentView = (UIScrollView *)_textView.superview;
// adjust views residing below this text view.
// sibling view
UIView *belowView = // access it somehow
CGRect frame1 = belowView.frame;
frame1.origin.y += difference;
belowView.frame = frame1;
// adjust parent scroll view,increase height.
CGSize frame3 = parentView.contentSize;
frame3.height += difference;
parentView.contentSize = frame3;
解决方法
看来UITextView的contentSize属性在iOS 7中未正确设置,直到viewDidAppear：.这可能是因为NSLayoutManager懒惰地放置文本,并且必须布置整个文本,以使contentSize正确. ensureLayoutForTextContainer：方法强制提供的文本容器的布局,之后usedRectForTextContainer：可用于获取边界.为了正确获取总宽度和高度,必须考虑textContainerInset属性.以下方法对我有用.
- (CGRect)contentSizeRectForTextView:(UITextView *)textView
{
[textView.layoutManager ensureLayoutForTextContainer:textView.textContainer];
CGRect textBounds = [textView.layoutManager usedRectForTextContainer:textView.textContainer];
CGFloat width = (CGFloat)ceil(textBounds.size.width + textView.textContainerInset.left + textView.textContainerInset.right);
CGFloat height = (CGFloat)ceil(textBounds.size.height + textView.textContainerInset.top + textView.textContainerInset.bottom);
return CGRectMake(0,width,height);
}
此外,似乎UITextView的setContentSize：方法是从layoutSubviews调用的.所以,在调用ensureLayoutForTextContainer之后,在一个textView(它本身调用layoutSubviews)上调用layoutIfNeeded：在其layoutManager中,应该使textView的contentSize正确.
[someTextView.layoutManager ensureLayoutForTextContainer:someTextView.textContainer]; [someTextView layoutIfNeeded]; // someTextView.contentSize should now have correct value
