const 定义警告 Sending 'const NSString *__strong' to parameter of type 'NSString * _Nullable'...
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const NSString * STOP_PRINT = @"停止打印";
在使用的地方出现警告
[barItem setTitle:STOP_PRINT];
Sending 'const NSString *__strong' to parameter of type'NSString * _Nullable' discards qualifiers
讲const的位置放在*后面即可
NSString * const STOP_PRINT = @"停止打印";
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