为什么ActivityViewController在控制台中显示自动约束错误?

问题描述

限时删除！！

我试图在我的应用程序中实现一个共享按钮，所以自然而然地，我转向了UIActivityViewController.由于某种原因，每当我按下共享按钮并弹出时，我的日志中都会显示以下消息:

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}

调用它时我并没有做任何花哨的事情，只是最低要求:

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)

这可能是Xcode beta 7/iOS 9中的错误吗?还是我错过了什么?我应该为此担心吗?

Could this be an error from Xcode beta 7/iOS 9? Or am I missing something? Should I be worried about it?

推荐答案

任一:

1. 这是Apple的错误-将其作为以下内容报告给 https://feedbackassistant.apple.com/只要它仍处于测试阶段
2. 您从一个过大的视图控制器中展示了模态(框架中有错误吗?)，然后约束V:[UIView:0x7c0a2fa0(<=528)破了

1. This is an Apple bug - report it to https://feedbackassistant.apple.com/ as long as it's still in beta
2. You present the modal from a oversized view controller (bug in frames?) and then the constraint V:[UIView:0x7c0a2fa0(<=528) breaks

您会担心吗?

1. 这不会导致崩溃，但是仍然表明日志存在，这是程序员错误的标志.理想情况下，如果您有意打破约束，则可以为约束提供优先级

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