constraints problem

[leancmscn]

Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint: 0x15df97b0> (null) ((null), (null))",
"<NSAutoresizingMaskLayoutConstraint: 0x15df97e0> H:[GSKStretchyHeaderContentView:0x15eebf10(375)](%28null%29, %28null%29)",
"<NSAutoresizingMaskLayoutConstraint: 0x15df34b0> H:[GSKStretchyHeaderView:0x15d55520(320)](%28null%29, %28null%29)",
"<NSLayoutConstraint: 0x15ee9630> H:[UIView:0x15d5bff0]-(0)-| ((null), (null))",
"<NSLayoutConstraint: 0x15eebba0> (null) ((null), (null))"
)

[leancmscn]

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        print("currentFactor when viewWillAppear:\(stretchyHeader.stretchFactor)")
        ....

currentFactor when viewWillAppear:0.64

not default = 1.0

[leancmscn]

fixed after add this.
tableView.sectionFooterHeight = 0

I use group style table