Question

我的通用应用程序（iOS 8）中有一个名为“vertical 1”的视图，在iPad（wAny hAny）中，它的高度为238，在iPhone纵向（wCompact，hRegular）中，其高度由其动态计算顶视图和底视图。 xib文件中的代码段如下所示，请注意约束（id：05F-Ed-Vem）在heightClass=regular-widthClass=compact变体中被排除。所有constaints在Interface Builder中都没有问题。

<view contentMode="scaleToFill" misplaced="YES" translatesAutoresizingMaskIntoConstraints="NO" id="BjW-gW-lfX" userLabel="vertical 1">
    <rect key="frame" x="501" y="20" width="1" height="238"/>
    <color key="backgroundColor" cocoaTouchSystemColor="groupTableViewBackgroundColor"/>
    <constraints>
        <constraint firstAttribute="height" constant="238" id="05F-Ed-Vem"/>
        <constraint firstAttribute="width" constant="1" id="ETL-HL-PI1"/>
        <constraint firstAttribute="width" constant="1" id="iNR-DD-mpQ"/>
    </constraints>
    <variation key="default">
        <mask key="constraints">
            <exclude reference="ETL-HL-PI1"/>
        </mask>
    </variation>
    <variation key="heightClass=regular-widthClass=compact">
        <mask key="constraints">
            <exclude reference="05F-Ed-Vem"/>
            <include reference="ETL-HL-PI1"/>
            <exclude reference="iNR-DD-mpQ"/>
        </mask>
    </variation>
</view>

但是当我在iPhone 5s模拟器中运行应用程序是wCompact hRegular size时，我得到了如下控制台警告

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:0x7fa6327ca1f0 V:[UIView:0x7fa6327c9e70(238)]>",
    "<NSLayoutConstraint:0x7fa6327d1510 V:[UIView:0x7fa6327d2ca0(250)]>",
    "<NSLayoutConstraint:0x7fa6327dcea0 V:[UIView:0x7fa6327d2ca0]-(16)-[UIView:0x7fa6327dc2e0]>",
    "<NSLayoutConstraint:0x7fa6327dddf0 V:[UIView:0x7fa6327c9e70]-(19)-[UIView:0x7fa6327dc2e0]>",
    "<NSLayoutConstraint:0x7fa6327dc760 V:[UIView:0x7fa6327cbb60]-(8)-[UIView:0x7fa6327d2ca0]>",
    "<NSLayoutConstraint:0x7fa6327dea90 V:[UIView:0x7fa6327cbb60]-(15)-[UIView:0x7fa6327c9e70]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fa6327d1510 V:[UIView:0x7fa6327d2ca0(250)]>

这非常非常奇怪，因为高度238不应该出现在iPhone布局中吗？有谁知道为什么？提前谢谢。

更新：
我试图清除wCompact中的所有约束，hRegular大小（换句话说，这个大小没有 ANY 约束），在iPhone模拟器中仍然有Unable to simultaneously satisfy constraints.警告。而这些限制在wAny中，hAny在iPad中完美运行。

发现post有类似问题。

更新：
我发现问题仅存在于自定义UITableViewCell中，即使只有两个简单的UIImageView和UIView，在wAny hAny中定义并在wCompact hRegular中卸载的约束将是在iPhone模拟器中显示，并发出警告。

Answer 1

好的，最后我使用了两个单独的xib个文件，一个用于手机，一个用于打击垫。

至少它有效。

：（

iOS 8自动布局约束在不同大小的类中搞砸了

1 个答案: