length (byte-wise) of a string in swift 2.2

Question

How do we find out the length (byte-wise) of a string [declared String type, not NSString] in Swift 2.2?

I know one way out is to use _bridgeToObejectiveC().length

Is there any other way out?

`someString.characters.count` returns the length of the String. I think I didn't get what you're asking really. — Onur Tuna, Aug 09 '16 at 06:29
character count and length are two different things. Swift uses unicode. In unicode, different characters take different number of bytes for storage. I wish to know 'how many bytes a string' is taking. — KawaiKx, Aug 09 '16 at 06:39

score 3 · Answer 1 · edited May 23 '17 at 12:00

3

let str: String = "Hello, World"
print(str.characters.count) // 12

let str1: String = "Hello, World"
print(str1.endIndex) // 12

let str2 = "Hello, World"
NSString(string: str2).length  //12

Refer String length in Swift 1.2 and Swift 2.0 and Get the length of a String

edited May 23 '17 at 12:00

Community

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answered Aug 09 '16 at 06:20

gurmandeep

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In case you need to do special unicode shenanigans also look into `str.utf8.count` and `str.utf16.count` – Gero Aug 09 '16 at 06:26
that is one answer – KawaiKx Aug 09 '16 at 07:15

score 3 · Answer 2 · answered Aug 09 '16 at 06:24

    let str: String = "Hello, World"
    print(str.characters.count) // 12
    let byteLength = str.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
    print("byte lenght: \(byteLength)")//12

    let str2: String = "你好"
    print(str2.characters.count) // 2
    let byteLength2 = str.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
    print("byte lenght: \(byteLength2)")//12

score 1 · Answer 3 · edited May 23 '17 at 12:00

1

Try this code:

Swift

    let test : String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    let bytes : NSInteger =   test.lengthOfBytesUsingEncoding(NSUTF8StringEncoding);
    NSLog("%i bytes", bytes);

Objective C

refer this link:

What is the length in bytes of a NSString?

edited May 23 '17 at 12:00

Community

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answered Aug 09 '16 at 06:25

Bhadresh Kathiriya

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This is pretty much what KawaiKx said they're *not* interested in: The `NSString` way... – Gero Aug 09 '16 at 06:27
you are also use String. This isn't imported string to find bytes imported. – Bhadresh Kathiriya Aug 09 '16 at 06:31
Okay, now you edited your answer. I agree that it doesn't really matter, I was just pointing it out. Also, I have no clue what your comment says, sorry. – Gero Aug 09 '16 at 06:35

score 1 · Accepted Answer · answered Aug 12 '16 at 01:59

1

I think type casting is another easier way to use the methods, properties of NSString class.

print((str as NSString).length)

answered Aug 12 '16 at 01:59

KawaiKx

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length (byte-wise) of a string in swift 2.2

4 Answers4