Automatic Preferred Max Layout Width is not available on iOS versions prior to 8 0

Question

I opened an existing iOS project with Xcode6 beta6  and Xcode lists the following warning for both Storyboard and Xib files      Automatic Preferred Max Layout Width is not available on iOS versions   prior to 8 0   I tried addressing the warning by setting the width as explicit like below     Yet this didn t resolve the warnings  How can they be removed

User · Answer

To Find the problem label s  in a large storyboard  follow my steps below    In xCode s Issue Navigator right click on the error and select  Reveal In Log    Note   Sam suggests below  look in xCode s report navigator  Also  Rivera notes in the comments that  As of Xcode 6 1 1  clicking on the warning will automatically open and highlight the conflicting label   I haven t tested this         This will show the error with a code at the end of your storyboard file  Copy the value after  storyboard      Next  reveal your storyboard as source file    Search  You should be able to tell what label it is from here quite easily by looking at the content     Once you find the label the solution that worked for me was to set the  preferred width  to 0     BTW  you can always quickly get the id of an interface item by selecting the item and looking under the identify inspector  Very handy

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Update 3  This warning can also be triggered by labels that have numberOfLines set to anything but 1 if your deployment target is set to 7 1  This is completely reproducible with new single-view project   Steps to Reproduce    Create a new single-view  objective-c project  Set the Deployment Target to 7 1 Open the project s storyboard Drop a label onto the provided view controller Set the numberOfLines for that label to 2  Compile   I ve filed the following radar  rdar   problem 18700567  Update 2  Unfortunately  this is a thing again in the release version of Xcode 6  Note that you can  for the most part  manually edit your storyboard xib to fix the problem  Per Charles A  in the comments below      It s worth mentioning that you can pretty easily accidentally   introduce this warning  and the warning itself doesn t help in finding   the label that is the culprit  This is unfortunate in a complex   storyboard  You can open the storyboard as a source file and search   with the regex  lt label     preferredMaxLayoutWidth  to find labels that   omit a preferredMaxLayoutWidth attribute value  If you add in   preferredMaxLayoutWidth  0  on such lines  it is the same as marking   explicit and setting the value 0    Update 1   This bug has now been fixed in Xcode 6 GM   Original Answer This is a bug in Xcode6-Beta6 and XCode6-Beta7 and can be safely ignored for now   An Apple engineer in the Apple Developer forums had this to say about the bug      Preferred max layout width is an auto layout property on UILabel that   allows it to automatically grow vertically to fit its content    Versions of Xcode prior to 6 0 would set preferredMaxLayoutWidth for   multiline labels to the current bounds size at design time  You would   need to manually update preferredMaxLayoutWidth at runtime if your   horizontal layout changed       iOS 8 added support for automatically computing   preferredMaxLayoutWidth at runtime  which makes creating multiline   labels even easier  This setting is not backwards compatible with iOS   7  To support both iOS 7 and iOS 8  Xcode 6 allows you to pick either  Automatic  or  Explicit  for preferredMaxLayoutWidth in the size   inspector  You should       Pick  Automatic  if targeting iOS 8 for the best experience  Pick    Explicit  if targeting  lt  iOS 8  You can then enter the value of   preferredMaxLayoutWidth you would like set  Enabling  Explicit    defaults to the current bounds size at the time you checked the box       The warning will appear if  1  you re using auto layout   2     Automatic  is set for a multiline label  you can check this in the   size inspector for the label   and  3  your deployment target  lt  iOS 8       It seems the bug is that this warning appears for non-autolayout   documents  If you are seeing this warning and not using auto layout   you can ignore the warning    Alternately  you can work around the issue by using the file inspector on the storyboard or xib in question and change  Builds for  to  Builds for iOS 8 0 and Later

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Now my Xcode version is 6 1  But I got this warning too  it annoys me a lot   after search again and again I found the solution   Reason You must have set your UILabel Lines   1 in your Storyboard    Solution  set your UILabel Lines attribute to 1 in Storyboard  restart your Xcode  It works for me  hope it can help more people   If you really need to show your words more than 1 line  you should do it in the code     the words will show in UILabel NSString  testString     Today I wanna set the line to multiple lines  bla bla         Today I wanna set the line to multiple lines  bla bla          self UserNameLabel setNumberOfLines 0   self UserNameLabel lineBreakMode   NSLineBreakByWordWrapping  UIFont  font    UIFont systemFontOfSize 12     Here I set the Label max width to 200  height to 60 CGSize size   CGSizeMake 200  60   CGRect labelRect    testString boundingRectWithSize size options NSStringDrawingUsesLineFragmentOrigin attributes  NSDictionary dictionaryWithObject font forKey NSFontAttributeName  context nil   self UserNameLabel frame   CGRectMake self UserNameLabel frame origin x  self UserNameLabel frame origin y  labelRect size width  labelRect size height   self UserNameLabel text   testString

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Since I don t have a 50 reputation Stackoverflow wont let me comment on the second best answer  Found another trick for finding the culprit label in the Storyboard   So once you know the id of the label  open your storyboard in a seperate tab with view controllers displayed and just do command F and command V and will take you straight to that label

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I got it working by selecting the original layout I had in the W   H selection  Storyboard is working as expected and the error is gone   Be also sure that you are developing for iOS 8 0  Check that from the project s general settings   This is where you should press

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To summarize  for me following the two instructions above to change any instances where numberOfLines   0 to 1 or greater  and manually adding preferredMaxLayoutWidth  0  to each instance of a label inside the storyboard source fixed all of my warnings

User · Answer

For some reason  even if changing the iOS Deployment Target to 8 0 or higher  the Xib files don t adopt that change and remain with the previous settings in the File inspector    Therefore  you should change it manually for each Xib   Once done  the warning will disappear  -

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Solution it s quite simple  Just enable Builds for iOS 8 and Later

User · Answer

I had this issue and was able to fix it by adding constraints to determine the max with for a label   When dropping a multiline label in there is not constraint set to enforce the width inside the parent view  This is where the new PreferredMaxWidth comes into play  On iOS 7 and earlier you have to define the max width yourself  I simply added a 10px constraint to the left and right hand side of the label   You can also add a  lt   width constraint which also fixes the issue   So this is not actually a bug  you simply have to define the max width yourself  The explicit option mention in other answer will also work as you are setting this width value however you will have to modify this value if you want the max width to change based on the parent width  as you have explicitly set the width     My above solution ensures the width is always maintained no matter how big the parent view is

User · Answer

You can fix this issue without opening the storyboard as a source  This warning is triggered by UILabels if numberOfLines   1 and deployment target is  lt  8 0  HOW TO FIND IT    Go to Issue Navigator  CMD 8  and Select latest built with the warning  Locate the warning s   search for  Automatic Preferred Max Layout   and press expand button on the right  Find the Object ID of the UILabel  Open the Storyboard and SEARCH  CMD f  for the object  It will SELECT AND HIGHLIGHT the UILabel  Set Preferred Width   0  Explicit  as others suggested

[ios] Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0

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