object_c中字符的内存计数器

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        NSString *str1=@"aa";
        NSLog(@"%zi",[str1 retainCount]);//结果 -1;
        
        NSString *str2=[[NSString alloc] initWithString:@"aa"];
        NSLog(@"%zi",[str2 retainCount]);//结果 -1;
 
        NSString *str3=[NSString stringWithString:@"aa"];
        NSLog(@"%zi",[str3 retainCount]);//结果 -1;       
        
       
   
        NSString *str4=[[NSString alloc] initWithFormat:@"AGE IS %i",12];
        NSLog(@"%zi",[str4 retainCount]);//结果 1;
        

        
    }
    return 0;
}
原文地址:https://www.cnblogs.com/gcb999/p/3041122.html