解决 sending 'const NSString *' to parameter of type 'NSString *' discards qualifiers
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比如，写了 const NSString* firstString = @"xxx";NSString* secondString = @"yyy";[secondString isEqualToString:firstString];会出现 sending 'const NSString *' to parameter of type 'NSString *' discards qualifiers 警告。解决办法：把 const NSString* firstString = @"xxx";改成 NSString* const firstString = @"xxx";解释：前者相当于指针本身不可修改，后者表示指针指向的内容不可修改，两者的作用都是使firstString只可读不可写。- 解决 sending 'const NSString *' to parameter of type 'NSString *' discards qualifiers
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