1.Xcode 9.0 新建工程报错
Safe Area Layout Guide Before IOS 9.0
![](https://img.haomeiwen.com/i2058540/7b9161958e792256.png)
![](https://img.haomeiwen.com/i2058540/23de98e809dd9987.png)
2.解决Http请求不能访问设置
1.添加字段
![](https://img.haomeiwen.com/i2058540/2f8dbb0300dead12.png)
3.No known instance method for selector 'respondsToSelector:
解决办法:声明的协议protocol没有从NSObject继承.
4.解决使用cocoaPods,import导入第三方库头文件没有提示问题的解决办法
1.选择target(就是左边你的工程target)—— BuildSettings —— search Paths 下的 User Header Search Paths
![](https://img.haomeiwen.com/i2058540/8053304d0f9afe68.png)
2.出现下面的图,并且点击“+”号添加一项:并且输入:“$(PODS_ROOT)”(没有引号),选择:recursive(会在相应的目录递归搜索文件):
![](https://img.haomeiwen.com/i2058540/11e882d9ad3f8609.png)
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