I created a playground in Xcode 6.3 (6D570) and input these following code:I created a playground in Xcode 6.3 (6D570) and
阅读背景：
找不到类型'String'的初始值设定项，它接受类型'的参数列表（格式：字符串，参数：UInt32
来源：互联网
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