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我得到了一个unichar从NSString实例方法返回的类型characterAtIndex(Int),我想将它与Swift类型进行比较String.是否有捷径可寻？

var str = "#ffffff"
var unichar = (str as NSString).characterAtIndex(0)
var unicharString = // Perform magic
var containsHash = unicharString == "#" // Should return `true`

谢谢