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  • NSString 属性为啥用copy 不用strong

     copy不能修改,strong可以修改,防止字符串被意外修改.demo:
    ——————————————————code 你要的 demo——————————————————
    @property (nonatomic, copy) NSString * copystring;
    @property (nonatomic, strong) NSString *strongString;
     
        NSMutableString *string = [NSMutableString stringWithString:@"a"];
       
        self.copystring = string;
        self.strongString = string;
       
        [string appendString: @"b"];
       
        NSLog(@"copyString:%@--StrongString:%@",self.copystring, self.strongString); // opyString:a--StrongString:ab
    --------------------------------------------------------------------------------------------------------------------------------------------
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  • 原文地址:https://www.cnblogs.com/tufei7/p/6263073.html
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