1、was built for newer iOS version (7.1) than being linked (7.0)

解决 在 other Linker flag 添加 -w  我其实也不知道为什么

2、automatic preferred max layout width before ios 8.0 in xcode 7

This is a warning related to label's Width property. We need to check "Explicit" for label's width.

3、Attribute Unavailable: First baseline layout attribute on iOS versions prior to 8.0

查看约束  把含有baseline的条件换掉即可

谈谈OC的警告

http://www.tuicool.com/articles/MbuIj2

让编译器 对一些 警告 闭嘴

http://blog.csdn.net/mamong/article/details/24542107