Base encodings use a specific, reduced alphabet to encode binary data. Just want to point out that withunsafebytes is a throwing function and actually needs a try in front of it just fyi, its actually a rethrow function, which means that it throws if the block you pass it throws. In the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. In fact, thats why it was base64encoded in the first place, because it was complex. Rfc 4648 the base16, base32, and base64 data encodings. Converting between image and base64 string in ios github. Alright, so today i wanna talk to you a little bit about parsing and working with binary data in swift. The swift overlay to the foundation framework provides the data structure, which bridges to the nsdata class and its mutable subclass nsmutable data. Display base64 string into webview as pdf stack overflow. Fill out the form below and instructions to reset your password will be emailed to you. The swift string class is documented in the swift standard library reference, although that doesnt cover rangeofstring because thats part of the foundation overlay for swift. Encoding and decoding a string using nsdata base64.
In this post ill do the opposite, putting the conversion into the context how to print an nsdata object to the debugging console. Encode uiimage nsdata nsstring base64encodedstring decode nsstring base64encodedstring nsdata uiimage but i get an issue when decoding a base64encodedstring to an nsdata by using the following code the following code some times converts in to a wrong nsdata, so which leads to a big issue in my project. For more information about value types, see working with cocoa frameworks in using swift with cocoa and objectivec swift 4. I recently found an objectivec extension on nsdata that encodes and decodes data with aes128. Data in swift 3 parsing a doom wad file appventure. Jan 24, 2014 on line 2 we create the nsdata to encode. Base64 is a encoding scheme which convert 8 bit binary into in this article we are going to cover how base64 encoding and decoding is done within swift. I wrote base64 encode and decode routines for objectivec in the recent past. Convert string to nsdata and nsdata to string swift. Its a common question among ios developers, how do i convert an nsstring object to an nsdata object. Nov 07, 2016 with the latest version of the swift 3. Below is a first pass i used the same test string from the original objectivec version to verify the results are as expected.
Base64 encode and decode in swift ios developer tips. Writes the data objects bytes to the file specified by a given path. In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. How can we decode base64 string and convert it into pdf file and view it in ios nsdata data. Swift 2 example to base64 encode and decode a string.
Base64 encoding and decoding in swift encode string. Cannot convert value of type string to type nsdata in coercion. Could someone please guide me to do this in xcode 6. Mar 12, 20 in the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. Does anyone know how to convert a uiimage to a base64 string, and then reverse it i have the below code. Base64 encode and decode nsdata and nsstring objects.
Jul 15, 2016 swift 3 replaces nsdata with the data value type. I found same answer in several places but it does not work anymore in swift. How can we decode base64 string and convert it into pdf file and view it in ios. Thats the documentation for nsstring, not swifts string class. You cant just convert that pdf binary data to a string. I hope you found this blog helpful while working with ios file management using swift. Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0.
Swift knowledge base free example code you can take and reuse in your own projects. Convert a base64 string in a blob according to the data and contenttype. In latest release of swift, now the idea is to omitting the needless words to make it clear and significant. To go back the other way, from a base64 encoded nsstring object to an nsdata object is as easy as calling the method initwithbase64encodedstring, passing in the base64 encoded nsstring lines 1415.
This is the swift knowledge base, a free, searchable collection of solutions for common ios questions, all written for swift 5. With that in mind, lets look at how to directly encode an nsdata object to base64 as well as how to decode an nsdata object from base64. I found answers in several places, but it does not work anymore in swift. When swift originally launched, nsstring older ios strings and native swift strings were completely interchangeable, as were nsarray and swift arrays, plus nsdictionary and swift dictionaries. Browse other questions tagged ios objectivec swift ios7 ios8 or ask your own question. Convert a base64 string into a binary uint8 array github. How to convert nsdata to nsstring or vice versa in objective. Demonstrates how to encode a pdf file to base64, and then decode.
How to use data withunsafemutablebytes in swift 3 apple. Jun 18, 2014 i wrote base64 encode and decode routines for objectivec in the recent past. I believe the answer might be work in previous xcode versions and not xcode 6. How to encode string to base64 in swift exceptionshub. Swift 34 pdf file encoding to base64 chilkat examples.
Base64encoding options string creates a base64 encoded string from the string using the given options. I believe the answer might be work in previous xcode not xcode 6. Just want to point out that withunsafebytes is a throwing function and actually needs a try in front of it just fyi, its actually a rethrow function, which means that. How to convert a string to an nsstring free swift 5. This is the swift knowledge base, a free, searchable collection of solutions.
Swift create image instance with image name from bundle var image. Line 6 encodes the data and returns an nsstring object. Decode base64 string to pdf ios nativescript community forum. Let me know if you have any questions or concerns regarding ios, please put a comment here and we will get back to you asap. How to save a pdf from a base64 string on the device with cordova. This means you do need to know which format is used to store the string, but utf8 is usually the best to go with. Theres a good chance the nsstring conversions above may be more about debugging than a daytoday need to base64 encoded strings. To go back the other way, from a base64 encoded nsstring object to an nsdata object is as easy as calling the method initwithbase64encodedstring, passing in.
Yes, you have to convert it to data and then save it to the documents directory on the device. Sep 16, 2014 swift create image instance with image name from bundle var image. Nonalphabet characters could exist within baseencoded data, caused by data. Objectivec language encoding and decoding a string using. What is difference between nsdata and data in swift. Working with ios file management using swift tutorial. Im trying to convert this objectivec code originally found in this stack overflow question which turns an nsstring into nsdata to swift. Creates a base64, utf8 encoded data object from the string using the given options. This is the documentation im looking at am i looking at the right documentation set. I kinda just stumbled into this, its not really something that i needed to do for work or anything like that. But while i was at it i also tried to pick the scariest most halloweenlike theme that i could find in deckset.
1240 247 1628 1102 152 1594 251 1273 49 133 247 993 118 1562 1419 1286 111 274 1182 1427 1415 1607 129 1519 78 54 629 909 889 448 994 1161 799 579 1488 653 975 1402