constraint error

[zhuli8com]

2018-05-28 20:04:20.696946+0800 DownloadButton_Example[22493:1707307] +[CATransaction synchronize] called within transaction
2018-05-28 20:04:21.066380+0800 DownloadButton_Example[22493:1707307] [LayoutConstraints] 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.
(
"<NSLayoutConstraint:0x60400028d4d0 PKCircleView:0x7fe842d1c7a0.width == 0 (active)>",
"<NSLayoutConstraint:0x60400028d750 H:|-(0)-[PKCircleView:0x7fe842d1c7a0] (active, names: '|':PKStopDownloadButton:0x7fe842d1b980 )>",
"<NSLayoutConstraint:0x60400028d7a0 H:[PKCircleView:0x7fe842d1c7a0]-(0)-| (active, names: '|':PKStopDownloadButton:0x7fe842d1b980 )>",
"<NSLayoutConstraint:0x60000028a5f0 PKDownloadButton:0x7fe842c0d800.width == 93 (active)>",
"<NSLayoutConstraint:0x60000028a730 H:|-(0)-[PKStopDownloadButton:0x7fe842d1b980] (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>",
"<NSLayoutConstraint:0x60000028a780 H:[PKStopDownloadButton:0x7fe842d1b980]-(0)-| (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400028d4d0 PKCircleView:0x7fe842d1c7a0.width == 0 (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-05-28 20:04:21.070967+0800 DownloadButton_Example[22493:1707307] [LayoutConstraints] 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.
(
"<NSLayoutConstraint:0x60400028d520 PKCircleView:0x7fe842d1c7a0.height == 0 (active)>",
"<NSLayoutConstraint:0x60400028d7f0 V:|-(0)-[PKCircleView:0x7fe842d1c7a0] (active, names: '|':PKStopDownloadButton:0x7fe842d1b980 )>",
"<NSLayoutConstraint:0x60400028d840 V:[PKCircleView:0x7fe842d1c7a0]-(0)-| (active, names: '|':PKStopDownloadButton:0x7fe842d1b980 )>",
"<NSLayoutConstraint:0x60000028a460 PKDownloadButton:0x7fe842c0d800.height == 30 (active)>",
"<NSLayoutConstraint:0x60000028a7d0 V:|-(0)-[PKStopDownloadButton:0x7fe842d1b980] (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>",
"<NSLayoutConstraint:0x60000028a820 V:[PKStopDownloadButton:0x7fe842d1b980]-(0)-| (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400028d520 PKCircleView:0x7fe842d1c7a0.height == 0 (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-05-28 20:04:21.072207+0800 DownloadButton_Example[22493:1707307] [LayoutConstraints] 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.
(
"<NSLayoutConstraint:0x60400028de30 PKCircleView:0x7fe842d20e40.width == 26 (active)>",
"<NSLayoutConstraint:0x60400028de80 H:|-(0)-[PKCircleView:0x7fe842d20e40] (active, names: '|':PKPendingView:0x7fe842d202e0 )>",
"<NSLayoutConstraint:0x600000289f60 H:[PKCircleView:0x7fe842d20e40]-(0)-| (active, names: '|':PKPendingView:0x7fe842d202e0 )>",
"<NSLayoutConstraint:0x60000028a5f0 PKDownloadButton:0x7fe842c0d800.width == 93 (active)>",
"<NSLayoutConstraint:0x60000028a9b0 H:|-(0)-[PKPendingView:0x7fe842d202e0] (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>",
"<NSLayoutConstraint:0x60000028aa00 H:[PKPendingView:0x7fe842d202e0]-(0)-| (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400028de30 PKCircleView:0x7fe842d20e40.width == 26 (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-05-28 20:04:21.073154+0800 DownloadButton_Example[22493:1707307] [LayoutConstraints] 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.
(
"<NSLayoutConstraint:0x60400028dde0 PKCircleView:0x7fe842d20e40.height == 26 (active)>",
"<NSLayoutConstraint:0x600000283a70 V:|-(0)-[PKCircleView:0x7fe842d20e40] (active, names: '|':PKPendingView:0x7fe842d202e0 )>",
"<NSLayoutConstraint:0x600000289a10 V:[PKCircleView:0x7fe842d20e40]-(0)-| (active, names: '|':PKPendingView:0x7fe842d202e0 )>",
"<NSLayoutConstraint:0x60000028a460 PKDownloadButton:0x7fe842c0d800.height == 30 (active)>",
"<NSLayoutConstraint:0x60000028aa50 V:|-(0)-[PKPendingView:0x7fe842d202e0] (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>",
"<NSLayoutConstraint:0x60000028aaa0 V:[PKPendingView:0x7fe842d202e0]-(0)-| (active, names: '|':PKDownloadButton:0x7fe842c0d800 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60400028dde0 PKCircleView:0x7fe842d20e40.height == 26 (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.