具体看一下报错原因：
① String! 赋值给 String ，报错为：拆包时Optional的值为nil；
② String? 赋值给 String，编译器报错为 Optional未拆包;
③ 拆包后的 String? 赋值给 String，这时，报错为：拆包时Optional的值为nil；
String! 和 拆包后的 String? 进行传值时报的错相同，由此我们可以得出一个结论：编译器默认 Optional(!) 是确定有值的，所以不需要再对 nil 的情况进行处理。Optional(!) 的变量只是给予了自动拆包的权限，在实际使用它的过程中不需要再次使用 ‘!’ 进行拆包。在swift官方文档中称为：Implicitly Unwrapped Optional (隐式拆包)，也可以理解成“拆过包了”。
但是，只有在变量确认有值的情况下才能进行拆包。就像如上代码，optionalString 为nil，进行拆包就会引发崩溃。swift官方建议，Optional 使用 if + ! 结合的方式或者 if let 进行安全地拆包。简单的看下代码：
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535425
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535429
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535437
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535440
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535452
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535453
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535457
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535460
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535468
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535473
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535479
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535482
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535491
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535496
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535508
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535509
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535536
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535544
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535546
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535555
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535559
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535563
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=535631
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536016
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536022
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536116
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536143
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536168
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536183
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536189
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536194
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536197
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536199
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536209
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536212
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536217
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536222
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536227
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536233
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536241
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536243
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536247
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536250
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536254
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536257
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536263
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536551
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536559
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536563
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536568
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536569
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536572
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536575
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536578
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536580
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536584
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536590
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536594
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536610
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http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536617
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536623
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536625
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536628
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536633
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536636
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536641
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536644
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536650
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536652
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536656
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536660
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536663
http://pic.cnhubei.com/space.php?uid=3431&do=album&id=536669
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