Xcode運行出現 xxx can only be used with ARC問題解決
當使用xcode運行項目時遇到xxx can only be used with ARC的問題，截圖如下： 解決辦法：只需要在target的build phases中，將compile sources中出現報錯的.m文件，雙擊，然後輸入-fobjc-arc，再enter即可；如下截圖所示：
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- 2. @Field parameters can only be used with form encoding
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