xcode – 布局中的奇怪异常

尝试调用这个方法：

avatarIconImageView.setContentHuggingPriority(UILayoutPriorityDefaultLow,forAxis: UILayoutConstraintAxis.Horizontal)

并捕获此异常：

Undefined symbols for architecture armv7:
“_UILayoutPriorityDefaultLow”,referenced from:
__TFC13TCProject_iOS36TCAvatarWithCounterUniversalCellView22configureBodyCellViewsfS0_FT_T_
in TCAvatarUniversalCellView.o ld: symbol(s) not found for
architecture armv7 clang: error: linker command failed with exit code
1 (use -v to see invocation)

这是什么意思？

解决方法

这看起来像iOS 8 SDK中的错误.您可以通过传递原始值来解决此问题.

> UILayoutPriorityDefaultRequired = 1000
> UILayoutPriorityDefaultHigh = 750
> UILayoutPriorityDefaultLow = 250

在你的情况下

avatarIconImageView.setContentHuggingPriority(250,forAxis: UILayoutConstraintAxis.Horizontal)