var str = "#ffffff"var unichar = (str as Nsstring).characteratIndex(0)var unicharString = // Perform magicvar containsHash = unicharString == "#" // Should return `true`
谢谢
var str:String = "#ffffff"var unichar = str[str.startIndex]var unicharString = "\(unichar)"var containsHash = unicharString == "#"总结
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