iOS7 UITextView contentsize.height alternative
IosUitextviewIos7Ios Problem Overview
I'm porting one of apps from iOS 6.1 to iOS 7. I'm using a layout where there's a UITextView
that has a fix width, but it's height is based on its contentsize. For iOS 6.1 checking the contentsize.height and setting it as the textview's frame height was enough, but it doesn't work on iOS 7.
How can I then create a UITextView
with a fixed width, but dynamic height based on the text it's showing?
NOTE: I'm creating these views from code, not with Interface Builder.
Ios Solutions
Solution 1 - Ios
With this following code, you can change the height of your UITextView depending of a fixed width (it's working on iOS 7 and previous version) :
- (CGFloat)textViewHeightForAttributedText:(NSAttributedString *)text andWidth:(CGFloat)width
{
UITextView *textView = [[UITextView alloc] init];
[textView setAttributedText:text];
CGSize size = [textView sizeThatFits:CGSizeMake(width, FLT_MAX)];
return size.height;
}
With this function, you will take a NSAttributedString and a fixed width to return the height needed.
If you want to calculate the frame from a text with a specific font you, need to use the following code :
- (CGSize)text:(NSString *)text sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size
{
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0"))
{
CGRect frame = [text boundingRectWithSize:size
options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading)
attributes:@{NSFontAttributeName:font}
context:nil];
return frame.size;
}
else
{
return [text sizeWithFont:font constrainedToSize:size];
}
}
You can add that SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO
on your prefix.pch file in your project as:
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
You can also replace the previous test SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)
by :
if ([text respondsToSelector:@selector(boundingRectWithSize:options:attributes:context:)])
Solution 2 - Ios
This worked for me for iOS6 and 7:
CGSize textViewSize = [self.myTextView sizeThatFits:CGSizeMake(self.myTextView.frame.size.width, FLT_MAX)];
self.myTextView.height = textViewSize.height;
Solution 3 - Ios
In iOS7, UITextView
uses NSLayoutManager
to layout text:
// If YES, then the layout manager may perform glyph generation and layout for a given portion of the text, without having glyphs or layout for preceding portions. The default is NO. Turning this setting on will significantly alter which portions of the text will have glyph generation or layout performed when a given generation-causing method is invoked. It also gives significant performance benefits, especially for large documents.
@property(NS_NONATOMIC_IOSONLY) BOOL allowsNonContiguousLayout;
disable allowsNonContiguousLayout
to fix contentSize
:
textView.layoutManager.allowsNonContiguousLayout = NO;
Solution 4 - Ios
Use this little function
-(CGSize) getContentSize:(UITextView*) myTextView{
return [myTextView sizeThatFits:CGSizeMake(myTextView.frame.size.width, FLT_MAX)];
}
Solution 5 - Ios
My final solution is based on HotJard's but includes both top and bottom insets of text container instead of using 2*fabs(textView.contentInset.top) :
- (CGFloat)textViewHeight:(UITextView *)textView
{
return ceilf([textView.layoutManager usedRectForTextContainer:textView.textContainer].size.height +
textView.textContainerInset.top +
textView.textContainerInset.bottom);
}
Solution 6 - Ios
There are simplier solution, using this method:
+(void)adjustTextViewHeightToContent:(UITextView *)textView;
{
if([[UIDevice currentDevice].systemVersion floatValue] >= 7.0f){
textView.height = [textView.layoutManager usedRectForTextContainer:textView.textContainer].size.height+2*fabs(textView.contentInset.top);
}else{
textView.height = textView.contentSize.height;
}
}
UPD: working just for displaying text (isEditable = NO)
Solution 7 - Ios
_textView.textContainerInset = UIEdgeInsetsZero;
_textView.textContainer.lineFragmentPadding = 0;
Just don't forget the lineFragmentPadding
Solution 8 - Ios
simple solution - textView.isScrollEnabled = false
works perfect when inside another scroll view, or tableView cell with UITableViewAutomaticDimension
Solution 9 - Ios
@Ana's, @Blake Hamilton's solution in swift.
var contentHeight: CGFloat = textView.sizeThatFits(textView.frame.size).height
The good thing for me was that this also returns the correct contentSize
, when isScrollEnable
is set to false. Setting to false returned the text view's frame size instead of the content size.