问题
I'm trying to implement a share button in my application and so naturally, I turned to UIActivityViewController
. For some reason, any time I press the share button and it pops up, I get the following message in my log:
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)
(
"<NSLayoutConstraint:0x7c0a65d0 V:[UIView:0x7c0a2fa0(<=528)]>",
"<NSLayoutConstraint:0x7c0a6540 UIView:0x7c0a2fa0.height == UIView:0x7c0a2e60.height>",
"<NSLayoutConstraint:0x7c0a7100 _UIAlertControllerView:0x7c0a27f0.height == UIView:0x7c0a2e60.height>",
"<NSLayoutConstraint:0x7c0b1660 V:[_UIAlertControllerView:0x7c0a27f0(568)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7c0a65d0 V:[UIView:0x7c0a2fa0(<=528)]>
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.
2015-06-20 15:32:43.885 App[19268:300248] 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)
(
"<NSLayoutConstraint:0x78fc3e70 V:[UIView:0x78ff1eb0(<=528)]>",
"<NSLayoutConstraint:0x78fc3de0 UIView:0x78ff1eb0.height == UIView:0x78fb9670.height>",
"<NSLayoutConstraint:0x78fc5aa0 _UIAlertControllerView:0x78ff69f0.height == UIView:0x78fb9670.height>",
"<NSLayoutConstraint:0x78f58860 V:[_UIAlertControllerView:0x78ff69f0(568)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x78fc3e70 V:[UIView:0x78ff1eb0(<=528)]>
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.
2015-06-20 15:32:48.691 App[19268:300248] viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "The operation couldn’t be completed. (_UIViewServiceInterfaceErrorDomain error 3.)" UserInfo=0x79982700 {Message=Service Connection Interrupted}
I am not doing anything fancy when calling it, just the bare minimum:
let someText:String = "Hello"
let activityViewController = UIActivityViewController(activityItems: [someText], applicationActivities: nil)
activityViewController.excludedActivityTypes = [
UIActivityTypePostToWeibo,
UIActivityTypePrint,
UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact,
UIActivityTypeSaveToCameraRoll,
UIActivityTypeAddToReadingList,
UIActivityTypePostToFlickr,
UIActivityTypePostToVimeo,
UIActivityTypePostToTencentWeibo
] self.navigationController!.presentViewController(activityViewController,
animated: true,
completion: nil)
Could this be an error from Xcode beta 7/iOS 9? Or am I missing something? Should I be worried about it?
回答1:
Either:
- This is an Apple bug - report it to https://feedbackassistant.apple.com/ as long as it's still in beta
- You present the modal from a oversized view controller (bug in frames?) and then the constraint
V:[UIView:0x7c0a2fa0(<=528)
breaks
Should you be worried?
- It won't cause crashes, but still it's a sign of a programmer error that the log is there, ideally you would provide priorities to constraints if you intentionally want to break them
来源:https://stackoverflow.com/questions/30954171/why-is-activityviewcontroller-displaying-auto-constraint-errors-in-console