iOS 自动布局问题 : Unable to simultaneously satisfy constraints

标签 ios objective-c iphone autolayout

脚步:

  • 我在一个页面中有两个 tableview，但一次显示一个 tableView；
  • 我为 tableview 的标题 View 创建了一个 View (将其称为
    标题查看 );
  • 我设置了标题查看 对于当前 tableView(A) 为
    tableHeaderView，并将另一个 tableView(B) 设置为 nil
    tableHeaderView(显示 A);
  • 我单击一个按钮以显示 tableView(B)，所以我将 nil 设置为
    tableView(A) 的 tableHeaderView，设置 标题查看 作为
    tableView(B) 的 tableHeaderView；

    • 当我为 tableView(N) 设置 headerView 时，错误来了，详细请看下面的日志。
    控制台错误日志如下:
        2015-12-04 10:15:18.777 XXXApp[1223:360705] 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:0x7f8f7bdd74b0 H:|-(10)-[UIView:0x7f8f7bdbbe00]   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
    "<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
    "<NSLayoutConstraint:0x7f8f7bdd8fa0 H:|-(0)-[MarketGoodsDetail:0x7f8f7bdb92d0]   (Names: '|':UIView:0x7f8f7bdd8b70 )>",
    "<NSLayoutConstraint:0x7f8f7bdd8ff0 H:[MarketGoodsDetail:0x7f8f7bdb92d0]-(0)-|   (Names: '|':UIView:0x7f8f7bdd8b70 )>",
    "<NSLayoutConstraint:0x7f8f7bddac40 H:[UIView:0x7f8f7bdd8b70]-(0)-|   (Names: '|':UIView:0x7f8f7bdda860 )>",
    "<NSLayoutConstraint:0x7f8f7bddace0 H:|-(0)-[UIView:0x7f8f7bdd8b70]   (Names: '|':UIView:0x7f8f7bdda860 )>",
    "<NSLayoutConstraint:0x7f8f7e0c6d90 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7f8f7bdda860(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>

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.

    如杰森·贾勒特 的博客 http://staxmanade.com/2015/06/debugging-ios-autolayout-issues/我打印了 View 的自动布局信息，我认为它导致了以下问题:
    po [0x7f8f7bdb92d0 recursiveDescription]
<MarketGoodsDetail: 0x7f8f7bdb92d0; frame = (0 0; 375 127); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7f8f7bdb9760>>
   | <UILabel: 0x7f8f7bdb9b80; frame = (10 8.5; 37.5 12); text = '(广贵所)'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9780>>
   |    | <_UILabelContentLayer: 0x7f8f7bfc4090> (layer)
   | <UILabel: 0x7f8f7bdba820; frame = (10 22.5; 121.5 36); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9f10>>
   | <UILabel: 0x7f8f7bdbb460; frame = (237.5 35; 52.5 20.5); text = '-13.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbb660>>
   | <UILabel: 0x7f8f7bdbb9c0; frame = (307 35; 58 20.5); text = '-0.45%'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbbbc0>>
   | <UIView: 0x7f8f7bdbbe00; frame = (10 63.5; 355 0.5); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbbf70>>
   | <UILabel: 0x7f8f7bdbc0b0; frame = (10 76; 26 16); text = '今开'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbc2b0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c2a90> (layer)
   | <UILabel: 0x7f8f7bdbcd70; frame = (42 76; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbcf70>>
   | <UILabel: 0x7f8f7bdbd180; frame = (10 102; 26 16); text = '昨收'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd380>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c1640> (layer)
   | <UILabel: 0x7f8f7bdbd590; frame = (42 102; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd790>>
   | <UILabel: 0x7f8f7bdbd9a0; frame = (281.5 76; 26 16); text = '最高'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdba0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c1ea0> (layer)
   | <UILabel: 0x7f8f7bdbddb0; frame = (313.5 76; 51.5 16); text = '2909.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdfb0>>
   | <UILabel: 0x7f8f7bdbe1c0; frame = (281.5 102; 26 16); text = '最低'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe3c0>>
   |    | <_UILabelContentLayer: 0x7f8f7e0c4e60> (layer)
   | <UILabel: 0x7f8f7bdbe5d0; frame = (313.5 102; 51.5 16); text = '2889.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe7d0>>
   | <UIView: 0x7f8f7bdbe9e0; frame = (146 76; 83.5 42); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbeb50>>
   |    | <UILabel: 0x7f8f7bdbeb70; frame = (0 0; 26 16); text = '买进'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbed70>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e90> (layer)
   |    | <UILabel: 0x7f8f7bdbef80; frame = (0 26; 26 16); text = '卖出'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5990>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4b70> (layer)
   |    | <UILabel: 0x7f8f7bdd5b80; frame = (32 0; 51.5 16); text = '2898.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5d80>>
   |    | <UILabel: 0x7f8f7bdd5f90; frame = (32 26; 51.5 16); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd6190>>

    它是 super View 自动布局:
    po [[0x7f8f7bdb92d0 superview] recursiveDescription]
<UIView: 0x7f8f7bdd8b70; frame = (0 0; 375 127); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdd8ce0>>
   | <MarketGoodsDetail: 0x7f8f7bdb92d0; frame = (0 0; 375 127); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7f8f7bdb9760>>
   |    | <UILabel: 0x7f8f7bdb9b80; frame = (10 8.5; 37.5 12); text = '(广贵所)'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9780>>
   |    |    | <_UILabelContentLayer: 0x7f8f7bfc4090> (layer)
   |    | <UILabel: 0x7f8f7bdba820; frame = (10 22.5; 121.5 36); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdb9f10>>
   |    | <UILabel: 0x7f8f7bdbb460; frame = (237.5 35; 52.5 20.5); text = '-13.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbb660>>
   |    | <UILabel: 0x7f8f7bdbb9c0; frame = (307 35; 58 20.5); text = '-0.45%'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbbbc0>>
   |    | <UIView: 0x7f8f7bdbbe00; frame = (10 63.5; 355 0.5); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbbf70>>
   |    | <UILabel: 0x7f8f7bdbc0b0; frame = (10 76; 26 16); text = '今开'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbc2b0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c2a90> (layer)
   |    | <UILabel: 0x7f8f7bdbcd70; frame = (42 76; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbcf70>>
   |    | <UILabel: 0x7f8f7bdbd180; frame = (10 102; 26 16); text = '昨收'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd380>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c1640> (layer)
   |    | <UILabel: 0x7f8f7bdbd590; frame = (42 102; 51.5 16); text = '2905.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbd790>>
   |    | <UILabel: 0x7f8f7bdbd9a0; frame = (281.5 76; 26 16); text = '最高'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdba0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c1ea0> (layer)
   |    | <UILabel: 0x7f8f7bdbddb0; frame = (313.5 76; 51.5 16); text = '2909.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbdfb0>>
   |    | <UILabel: 0x7f8f7bdbe1c0; frame = (281.5 102; 26 16); text = '最低'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe3c0>>
   |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e60> (layer)
   |    | <UILabel: 0x7f8f7bdbe5d0; frame = (313.5 102; 51.5 16); text = '2889.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbe7d0>>
   |    | <UIView: 0x7f8f7bdbe9e0; frame = (146 76; 83.5 42); autoresize = RM+BM; layer = <CALayer: 0x7f8f7bdbeb50>>
   |    |    | <UILabel: 0x7f8f7bdbeb70; frame = (0 0; 26 16); text = '买进'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdbed70>>
   |    |    |    | <_UILabelContentLayer: 0x7f8f7e0c4e90> (layer)
   |    |    | <UILabel: 0x7f8f7bdbef80; frame = (0 26; 26 16); text = '卖出'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5990>>
   |    |    |    | <_UILabelContentLayer: 0x7f8f7e0c4b70> (layer)
   |    |    | <UILabel: 0x7f8f7bdd5b80; frame = (32 0; 51.5 16); text = '2898.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd5d80>>
   |    |    | <UILabel: 0x7f8f7bdd5f90; frame = (32 26; 51.5 16); text = '2892.00'; opaque = NO; autoresize = RM+BM; userInteractionEnabled = NO; layer = <_UILabelLayer: 0x7f8f7bdd6190>>

    谁能告诉我是哪个约束导致了这个问题？感谢您的帮助!

    最佳答案

    我认为您想将这些约束的优先级设置为 999:

    "<NSLayoutConstraint:0x7f8f7bdd74b0 H:|-(10)-[UIView:0x7f8f7bdbbe00]   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>",
"<NSLayoutConstraint:0x7f8f7bdd7500 H:[UIView:0x7f8f7bdbbe00]-(10)-|   (Names: '|':MarketGoodsDetail:0x7f8f7bdb92d0 )>"

    我认为这些与以下内容相冲突:
    "<NSLayoutConstraint:0x7f8f7e0c6d90 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7f8f7bdda860(0)]>"

    它指定您的容器 View 的宽度将为 0 点。所以它不能添加 10 点边距(上面的两个约束要求)。将它们设置为 999 应该可以优雅地覆盖它们。

    见 What is a 'UIView-Encapsulated-Layout-Width' constraint?了解更多信息。

    关于iOS 自动布局问题 : Unable to simultaneously satisfy constraints，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34080090/

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