Creating NSData objects
suggest changeUsing a file
Swift
let data = NSData(contentsOfFile: filePath) //assuming filePath is a valid path
Objective-C
NSData *data = [NSData dataWithContentsOfFile:filePath]; //assuming filePath is a valid path
Using a String object
Swift
let data = (string as NSString).dataUsingEncoding(NSUTF8StringEncoding) //assuming string is a String object
Objective-C
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding]; //assuming string is a String object
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