const
2020-05-17 本文已影响0人
自律_自强_通达
NSString *const 和 const NSString * 的区别
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NSString *const
变量存储的指针可变，变量存储的值不可变//A modifiable pointer to a constantNSString (its value can't be modified) const NSString * str = @"11"; str = @"22"; -
const NSString *
变量存储的值可变，变量存储的指针不可变//A constant pointer (not modifiable) to an NSString (its value can be modified) NSString *const str1 = @"33"; str1 = @"44"; //会报错
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