自动布局约束在生产中引发异常
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【中文标题】自动布局约束在生产中引发异常【英文标题】：Autolayout constraint throws exception in production 【发布时间】：2015-04-19 14:10:29 【问题描述】：我遇到了一个非常奇怪的问题，我似乎无法弄清楚如何开始工作。当我在我的设备或模拟器上调试我的应用程序时，我没有收到任何错误。当我为临时部署构建它时，该应用程序会引发异常并失败。我在日志中遇到的错误是
[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:]
对于我的所有视图，我的布局看起来都是这样的。
我的约束将视图扩展到屏幕的整个宽度，并且我在 BaseViewController 中的视图上创建了一个动态宽度约束，该约束被所有其他视图继承。我已经为我的每个子视图的 scrollView 和 contentView 创建了我的代表。
class BaseViewController: UIViewController, UITextFieldDelegate
var activeField:UITextField?
@IBOutlet weak var scrollView: UIScrollView?
@IBOutlet weak var contentView: UIView?
override func viewDidLoad()
if(self.scrollView != nil)
// Do any additional setup after loading the view.
let leftConstraint:NSLayoutConstraint = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Left, multiplier: 1.0, constant: 0)
self.view.addConstraint(leftConstraint)
let rightConstraint:NSLayoutConstraint = NSLayoutConstraint(item: self.contentView!, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Right, multiplier: 1.0, constant: 0)
self.view.addConstraint(rightConstraint)
super.viewDidLoad()
我非常乐意提供任何其他信息，请尽管询问，我会尽我所能。
编辑
这只发生在未连接到调试器的存档和运行时。如果我调试发布版本没有问题。
import UIKit
class BaseViewController: UIViewController, UITextFieldDelegate
var activeField:UITextField?
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad()
super.viewDidLoad()
override func didReceiveMemoryWarning()
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent)
self.view.endEditing(true);
func textFieldShouldReturn(field: UITextField) -> Bool
field.resignFirstResponder()
return true
func textFieldDidBeginEditing(sender: UITextField)
self.activeField = sender
func textFieldDidEndEditing(sender: UITextField)
self.activeField = nil
func keyboardDidShow(notification: NSNotification)
if(self.activeField != nil && self.scrollView != nil)
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()
let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
self.scrollView!.contentInset = contentInsets
self.scrollView!.scrollIndicatorInsets = contentInsets
var aRect = self.view.frame
aRect.size.height -= keyboardSize.size.height
if(!CGRectContainsPoint(aRect, self.activeField!.frame.origin))
self.scrollView!.scrollRectToVisible(self.activeField!.frame, animated: true)
func keyboardWillBeHidden(notification: NSNotification)
if(self.scrollView != nil)
let contentInsets:UIEdgeInsets = UIEdgeInsetsZero
self.scrollView!.contentInset = contentInsets
self.scrollView!.scrollIndicatorInsets = contentInsets
我的日志现在看起来像这样，我不确定我的问题是什么。
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_c.dylib 0x0000000193c19690 __sfvwrite + 0
1 libsystem_c.dylib 0x0000000193c20958 __vfprintf + 11352
2 libsystem_c.dylib 0x0000000193c3b67c __v2printf + 584
3 libsystem_c.dylib 0x0000000193bce208 _vsnprintf + 300
4 libsystem_c.dylib 0x0000000193bcec54 snprintf_l + 20
5 CoreFoundation 0x0000000181cc7018 __CFStringAppendFormatCore + 11580
6 CoreFoundation 0x0000000181cc42a0 _CFStringCreateWithFormatAndArgumentsAux2 + 244
7 Foundation 0x0000000182b0a444 -[NSPlaceholderString initWithFormat:locale:arguments:] + 168
8 Foundation 0x0000000182b0a304 +[NSString stringWithFormat:] + 72
9 yazda-ios 0x00000001000fcea0 +[NRMAThreadLocalStore currentThreadDictionary] (NRMAThreadLocalStore.m:238)
10 yazda-ios 0x00000001000fb678 +[NRMAThreadLocalStore threadLocalTrace] (NRMAThreadLocalStore.m:36)
11 yazda-ios 0x00000001000fc040 +[NRMAThreadLocalStore prepareSameThread:child:withParent:] (NRMAThreadLocalStore.m:126)
12 yazda-ios 0x00000001000fbac0 +[NRMAThreadLocalStore pushChild:forParent:] (NRMAThreadLocalStore.m:91)
13 yazda-ios 0x00000001000c92d4 +[NRMATraceController newTraceSetup:parentTrace:] (NRMATraceController.m:310)
14 yazda-ios 0x00000001000c97d8 +[NRMATraceController enterMethod:fromObject:parentTrace:traceCategory:withTimer:] (NRMATraceController.m:374)
15 yazda-ios 0x00000001000c95ac +[NRMATraceController enterMethod:fromObject:parentTrace:traceCategory:] (NRMATraceController.m:338)
16 yazda-ios 0x00000001000b4498 NRMA__beginMethod (NRMAMethodProfiler.m:1051)
17 yazda-ios 0x00000001000b406c NRMA__voidParamHandler (NRMAMethodProfiler.m:705)
18 yazda-ios 0x0000000100047f38 yazda_ios.BaseViewController.viewDidLoad (yazda_ios.BaseViewController)() -> () (BaseViewController.swift:32)
19 yazda-ios 0x00000001000b407c NRMA__voidParamHandler (NRMAMethodProfiler.m:707)
20 yazda-ios 0x0000000100047f38 yazda_ios.BaseViewController.viewDidLoad (yazda_ios.BaseViewController)() -> () (BaseViewController.swift:32)
【问题讨论】：
对于您以编程方式添加约束的视图，您是否将 translatesAutoresizingMaskToConstraints 设置为 NO？ 我目前不在。我需要在父视图、滚动视图还是我的内容视图上设置它？ 【参考方案1】：我发现了我的问题。出于某种原因，我遇到了依赖问题或构建问题，我的 ViewController 继承了我的 BaseViewController。
由于某种原因，其中一种方法没有像预期的那样返回，它把一切都搞砸了。
【讨论】：
【参考方案2】：两个约束相互矛盾，所以你可能会面临这样的情况
【讨论】：
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