object_c函数多个返回值

- (void)readStr1:(NSString**)str1 andStr2:(NSString**)str2
{
    NSString *s1 = @"1";
    NSString *S2 = @"2";
    *str1 = [s1 copy];
    *str2 = [S2 copy];
}
//下面是调用方法：
NSString *s1 = nil;
    NSString *s2 = nil;
    [self readStr1:&s1 andStr2:&s2];

//下面是打印日志
NSLog(@"s1 %@ s2 %@",s1,s2);
//下面是输出结果：
s1 1 s2 2