Swift3.0——字符串与基本运算符中的变化

var string = "Hello-Swift" //获取某个下标后一个下标对应的字符 char="e" //swift2.2 //var char = string[startIndex.successor()] //swift3.0 var char = string[string.index(after: startIndex)] //获取某个下标前一个下标对应的字符 char2 = "

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