iOS7 UITextView contentsize.height alternative

Question

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.

Solution 1

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

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

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

Use this little function

-(CGSize) getContentSize:(UITextView*) myTextView{
    return [myTextView sizeThatFits:CGSizeMake(myTextView.frame.size.width, FLT_MAX)];
}

Solution 5

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);
}

View more solutions

Comments

[Zoltan Varadi]

i can only give it to you after 24 hours. be patient, it's yours :)

[andrew-caulfield]

Maybe you should link to the answers you took them from? stackoverflow.com/questions/18368567/…

[Valerii Pavlov]

It seems like your solition doesnt work. When textview goto second line usedRectForTextContainer method returns same height.

[HotJard]

Oh, may be, I'v just use it for displaying text

[LiangWang]

@Jordan Montel, for another question, if i have fixed width and height , how can i find the best font size for an assigned string? i have the similar issue on iOS7 (on iOS6, i can do that)

[Cœur]

@Jacky : trial and error; increase or decrease the size by 1 until its calculated height is too big. Or make it size 1000 and auto-resize to fit.

[Mani]

Hi, Yes its woking for me… I am used "txtviewHeight.frame.size.height" instead of "txtviewHeight.contentSize.height"

[Paul Brady]

Works in iOS6 and iOS7 for me. Thanks!

[vietstone]

Your answer is not fit the question, but fit my problem. So I vote up :)

[Hexark]

why am i getting property height not found on object of type "UITextView" ?

[user]

@Hexark textView.bounds.size.height

[user2159978]

this answer is ALREADY INCORRECT. Try to input a lot of text inside such text field. Suddenly incorrect size? At least NSStringDrawingUsesFontLeading is extra

[samthui7]

(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) helps me a lot.

[Dvole]

This does not fix content size for me. Scrolling is disabled.

[Code Farmer]

This piece of code solved my problem, but what does generation-causing method mean on you comment?