I'm trying to resize a text view according to content & also it's sibling and parent container.
Below code is working fine in iOS 6
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];
}
Tried to follow iOS 7 solution from: How do I size a UITextView to its content on iOS 7?
but not working.
Any pointers?
Working code solution from @NSBouzouki
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;
It seems UITextView's
contentSize
property is not correctly set in iOS 7 till viewDidAppear:
. This is probably because NSLayoutManager
lays out the text lazily and the entire text must be laid out for contentSize
to be correct. The ensureLayoutForTextContainer:
method forces layout of the provided text container after which usedRectForTextContainer:
can be used for getting the bounds. In order to get total width and height correctly, textContainerInset
property must be taken into account. The following method worked for me.
- (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, 0, width, height);
}
Additionally, it seems UITextView's
setContentSize:
method is called from layoutSubviews
. So, calling layoutIfNeeded
on a textView
(which itself calls layoutSubviews
) after calling ensureLayoutForTextContainer:
on its layoutManager
, should make the textView's
contentSize
correct.
[someTextView.layoutManager ensureLayoutForTextContainer:someTextView.textContainer];
[someTextView layoutIfNeeded];
// someTextView.contentSize should now have correct value
GrowingTextViewHandler is an NSObject subclass which resizes text view as user types text. Here is how you can use it.
@interface ViewController ()<UITextViewDelegate>
@property (weak, nonatomic) IBOutlet UITextView *textView;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *heightConstraint;
@property (strong, nonatomic) GrowingTextViewHandler *handler;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.handler = [[GrowingTextViewHandler alloc]initWithTextView:self.textView withHeightConstraint:self.heightConstraint];
[self.handler updateMinimumNumberOfLines:3 andMaximumNumberOfLine:8];
}
- (void)textViewDidChange:(UITextView *)textView {
[self.handler resizeTextViewWithAnimation:YES];
}
@end
来源:https://stackoverflow.com/questions/19837178/resize-uitextview-according-to-its-content-in-ios7