nsdata

I'm trying to save a UIImage to NSData and then read the NSData back to a new UIImage in Swift. To convert the UIImage to NSData I'm using the following code: let imageData: NSData = UIImagePNGRepresentation(myImage) How do I convert imageData (i.e., NSData ) back to a new UIImage ? algal UIImage(data:imageData,scale:1.0) presuming the image's scale is 1. In swift 4.2, use below code for get Data(). image.pngData() Ivan Sinigaglia Thanks. Helped me a lot. Converted to Swift 3 and worked To save: let data = UIImagePNGRepresentation(image) To load: let image = UIImage(data: data) Use

I'm unable to create an NSData object from a UIColor (with a pattern) created with the factory method [UIColor colorWithPatternImage:image] works fine for standard UIColor objects. Wondering if there is another way to save a UIColor with a pattern into Core Data. I am using the following code to archive the UIColor (with a pattern)... - (id)transformedValue:(id)value { NSData *data = [NSKeyedArchiver archivedDataWithRootObject:value]; return data; } and these are the errors I'm receiving... -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding

fairly new iPhone developer here. Building an app to send RS232 commands to a device expecting them over a TCP/IP socket connection. I've got the comms part down, and can send ASCII commands fine. It's the hex code commands I'm having trouble with. So lets say I have the following hex data to send (in this format): \x1C\x02d\x00\x00\x00\xFF\x7F How do I convert this into an NSData object, which my send method expects? Obviously this does not work for this hex data (but does for standard ascii commands): NSString *commandascii; NSData *commandToSend; commandascii = @"\x1C\x02d\x00\x00\x00\xFF

I have downloaded a gif image into an NSData object (I've checked the contents of the NSData object and it's definitely populated). Now I want to load that image into my UIWebView. I've tried the following: [webView loadData:imageData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil]; but I get a blank UIWebView. Loading the image from the same URL directly works fine: NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:imageUrl]]; [imageView loadRequest:request]; Do I need to set the textEncodingName to something, or am I doing something else wrong? I want to load

I'm trying to send some NSData over Bluetooth through GameKit . While I've got GameKit set up and are able to send small messages across, I now would like to expand and send across whole files. I've been reading that you have to split large files up into packets before sending them across individually. So I decided to create a struct to make it easier to decode the packets when they're received at the other end: typedef struct { const char *fileName; NSData *contents; int fileType; int packetnumber; int totalpackets; } file_packet; However, for small files (8KB and less) I thought one packet