Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0
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在Xcode6下开发时，使用autolayout的xib出现警告：Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0
原因：xcode6下默认开启自动设置UILabel的preferredMaxLayoutWidth 的属性，而自动的特性只支持iOS8，故导致这个警告，如果想兼容iOS7则需要消除。
解决方法：设置固定的preferredMaxLayoutWidth （勾选Explicit（其中如果label不是多行就不用勾选了，因为无效）如果只想支持iOS8就不要勾选了，动态的更加方便），如下图，并在代码中实时修改此属性（注：此属性只对多行的UILabel有效，即lines不为1，如果是1行的不需要修改）。
参考：http://stackoverflow.com/questions/25398312/automatic-preferred-max-layout-width-is-not-available-on-ios-versions-prior-to-8
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