Below is a first pass i used the same test string from the original objectivec version to verify the results are as expected. Yes, you have to convert it to data and then save it to the documents directory on the device. Encoding and decoding a string using nsdata base64. 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. This is the swift knowledge base, a free, searchable collection of solutions for common ios questions, all written for swift 5. Demonstrates how to encode a pdf file to base64, and then decode. Convert a base64 string in a blob according to the data and contenttype. 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.
This is the swift knowledge base, a free, searchable collection of solutions. Creates a base64, utf8 encoded data object from the string using the given options. In this post ill do the opposite, putting the conversion into the context how to print an nsdata object to the debugging console. Does anyone know how to convert a uiimage to a base64 string, and then reverse it i have the below code. Nov 07, 2016 with the latest version of the swift 3. I found answers in several places, but it does not work anymore in swift. Swift knowledge base free example code you can take and reuse in your own projects. Browse other questions tagged ios objectivec swift ios7 ios8 or ask your own question. I found same answer in several places but it does not work anymore in swift. Jun 18, 2014 i wrote base64 encode and decode routines for objectivec in the recent past.
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. Objectivec language encoding and decoding a string using. 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. 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. How can we decode base64 string and convert it into pdf file and view it in ios nsdata data. I believe the answer might be work in previous xcode versions and not xcode 6. Jul 15, 2016 swift 3 replaces nsdata with the data value type.
What is difference between nsdata and data in swift. Swift create image instance with image name from bundle var image. How to save a pdf from a base64 string on the device with cordova. For more information about value types, see working with cocoa frameworks in using swift with cocoa and objectivec swift 4.
In fact, thats why it was base64encoded in the first place, because it was complex. Base64encoding options string creates a base64 encoded string from the string using the given options. Nonalphabet characters could exist within baseencoded data, caused by data. In latest release of swift, now the idea is to omitting the needless words to make it clear and significant. 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. In the previous post i wrote a few lines of code to convert an nsstring object to an nsdata object. Convert string to nsdata and nsdata to string swift. How to convert a string to an nsstring free swift 5. Convert a base64 string into a binary uint8 array github.
Converting between image and base64 string in ios github. 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. How to convert base64 data and nsdata into string stack overflow. 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. In files where you want to use base64 encodingdecoding, simply include the header file and use one of the provided nsdata or nsstring additions. Rfc 4648 the base16, base32, and base64 data encodings. Display base64 string into webview as pdf stack overflow. Data in swift 3 parsing a doom wad file appventure. Sep 16, 2014 swift create image instance with image name from bundle var image. This means you do need to know which format is used to store the string, but utf8 is usually the best to go with. Im trying to convert this objectivec code originally found in this stack overflow question which turns an nsstring into nsdata to swift.
Jan 24, 2014 on line 2 we create the nsdata to encode. This is the documentation im looking at am i looking at the right documentation set. I recently found an objectivec extension on nsdata that encodes and decodes data with aes128. 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. Swift 34 pdf file encoding to base64 chilkat examples. 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. Base encodings use a specific, reduced alphabet to encode binary data. Working with ios file management using swift tutorial.
Line 6 encodes the data and returns an nsstring object. I hope you found this blog helpful while working with ios file management using swift. How to use data withunsafemutablebytes in swift 3 apple. 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. Writes the data objects bytes to the file specified by a given path. I wrote base64 encode and decode routines for objectivec in the recent past. Decode base64 string to pdf ios nativescript community forum. Extends string class import foundation extension string func base64encoded string let plaindata datausingencodingnsutf8stringencoding let base64string plaindatabase64encodedstringwithoptionsomraw0. Hi all,in coding we have secure some information while we are sending it to server and vice versa,in this case we use encoding and decoding. How to encode string to base64 in swift exceptionshub. Theres a good chance the nsstring conversions above may be more about debugging than a daytoday need to base64 encoded strings. Fill out the form below and instructions to reset your password will be emailed to you. 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.
I believe the answer might be work in previous xcode not xcode 6. Cannot convert value of type string to type nsdata in coercion. Alright, so today i wanna talk to you a little bit about parsing and working with binary data in swift. Base64 encode and decode in swift ios developer tips. I kinda just stumbled into this, its not really something that i needed to do for work or anything like that. Swift 2 example to base64 encode and decode a string.
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