not available in automatic reference counting mode
release' is unavailable: not available in automatic reference counting mode..
解决办法：
You need to turn off Automatic Reference Counting. You do this by clicking on your project in the navigator (the top item in the finder-like thing on the left), then click on your target, select "Build Settings" and turn off the option "Objective-C Automatic Reference Counting" (you can use the search field on the upper right to search it).
补充：由于参数非常多，可以在搜索框中输入关键词，如：refer，就比较方便的看到了。：）
参考图：
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/12231606/viewspace-1075723/ ，如需转载，请注明出处，否则将追究法律责任。
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