The string of Swift notes _swift

String

Brief introduction

Strings in string are value types, and when passed, the values are copied, and NSString string passes are references. We can iterate through the string with for:

Copy Code code as follows:

var a:string = "a"
For C in "Hello" {
println (c)
}

You can calculate the number of characters for a string by countelements:

Copy Code code as follows:

Countelements ("1234567")//7

Note, however, that the length of countelements and nsstring is not always exactly the same value, because length takes advantage of the value of the UTF-16 type, not the Unicode character. For example, after emoji expression added, the result of UTF-16 calculation is 2, and the result of Unicode is 1. You can look at the following example:

Copy Code code as follows:

var a = "Hello

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