swift报错:value of type 'string' has no member 'generator'

错误：value of type 'string' has no member 'generator'

解释：这个是oc中的写法。

比如，像下面这样遍历字符

for i in "swift".Charactor
{print(i);
}

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swift报错:value of type 'string' has no member 'generator'

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