CODEWITHSUNDEEP
iosuitableviewautolayoutbreakpointslldb
Robert Atkins
Robert Atkins

Reputation: 24668

"This NSLayoutConstraint is being configured with a constant that exceeds internal limits"

While trying to debug an AutoLayout problem (a table cell which should be growing according to the size of its content isn't, in some circumstances), I set a breakpoint on the last line of my tableView:heightForRow: method, and trying to print the value of systemLayoutSizeFittingSize: I get this:

(lldb) p ((CGSize)[cachedCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize]).height
2014-10-14 11:15:49.492 AppName[72132:10302054] This NSLayoutConstraint is being configured with a constant that exceeds internal limits.  A smaller value will be substituted, but this problem should be fixed. Break on void _NSLayoutConstraintNumberExceedsLimit() to debug.  This will be logged only once.  This may break in the future.
(CGFloat) $0 = 57

Well ok, that's interesting. But I try and do what it says and set a breakpoint on that function:

Grab of breakpoint definition on _NSLayoutConstraintNumberExceedsLimit()

... and this breakpoint doesn't get hit.

(Annoyingly, it seems to work in some cases but not in others and I can't see a difference in the setup.)

Upvotes: 13

Views: 12093

Answers (1)

Jason Molenda
Jason Molenda

Reputation: 15395

Omit the () from the symbol name. It's a little clearer what is happening if you use the debugger console window to set this breakpoint with the breakpoint set --name command:

(lldb) br s -n _NSLayoutConstraintNumberExceedsLimit()
Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) br s -n _NSLayoutConstraintNumberExceedsLimit
Breakpoint 2: where = Foundation`_NSLayoutConstraintNumberExceedsLimit, address = 0x00007fff9168e6f5
(lldb)

If you had used the breakpoint list (br l) command in your Xcode debug session, you would have seen that the _NSLayoutConstraintNumberExceedsLimit() breakpoint didn't get set in any locations.

Upvotes: 21

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