convert UIImage to NSData

Question

I am using this code in my app which will help me to send a image   However  I have an image view with an image  I have no file in appbundle but have the image in my side  How can I change the below code   Can anyone tell me how can I convert myimage to NSData       Attach an image to the email NSString  path     NSBundle mainBundle  pathForResource   rainy  ofType   jpg    NSData  myData    NSData dataWithContentsOfFile path    picker addAttachmentData myData mimeType   image jpeg  fileName   rainy

User · Answer

Solution in Swift 4  extension UIImage       var data   Data          return cgImage  dataProvider  data as Data

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Create the reference of image      UIImage  rainyImage    UIImage imageNamed   rainy jpg      displaying  image in image view    imagedisplay is reference of imageview   imagedisplay image   rainyImage    convert it into NSData by passing UIImage reference and provide compression quality in float values   NSData  imgData   UIImageJPEGRepresentation rainyImage  0 9

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-  void  imageConvert        UIImage  snapshot   self myImageView image        self encodeImageToBase64String snapshot           call this method for image convert in base 64      - NSString   encodeImageToBase64String  UIImage   image               return  UIImagePNGRepresentation image  base64EncodedStringWithOptions NSDataBase64Encoding64CharacterLineLength

User · Answer

Try one of the following  depending on your image format      UIImageJPEGRepresentation      Returns the data for the specified image in JPEG format    NSData   UIImageJPEGRepresentation      UIImage  image     CGFloat compressionQuality         UIImagePNGRepresentation      Returns the data for the specified image in PNG format   NSData   UIImagePNGRepresentation      UIImage  image      Here the docs   EDIT   if you want to access the raw bytes that make up the UIImage  you could use this approach   CGDataProviderRef provider   CGImageGetDataProvider image CGImage   NSData  data    id CFBridgingRelease CGDataProviderCopyData provider    const uint8 t  bytes    data bytes     This will give you the low-level representation of the image RGB pixels   Omit the CFBridgingRelease bit if you are not using ARC

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NSData  imageData   UIImagePNGRepresentation myImage image

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If you have an image inside a UIImageView   e g   myImageView   you can do the following   Convert your image using UIImageJPEGRepresentation   or UIImagePNGRepresentation   like this   NSData  data   UIImagePNGRepresentation myImageView image     or NSData  data   UIImageJPEGRepresentation myImageView image  0 8     The float param  0 8 in this example  is the compression quality    expressed as a value from 0 0 to 1 0  where 1 0 represents    the least compression  or best quality     You can also put this code inside a GCD block and execute in another thread  showing an UIActivityIndicatorView during the process         code to show a loading view here   dispatch queue t myQueue   dispatch queue create  com my queue   DISPATCH QUEUE SERIAL    dispatch async myQueue           NSData  data   UIImagePNGRepresentation myImageView image         some code          dispatch async  dispatch get main queue                  code to hide the loading view here

User · Answer

Use if-let block with Data to prevent app crash  amp  safe execution of code  as function UIImagePNGRepresentation returns an optional value    if let img   UIImage named   TestImage png         if let data Data   UIImagePNGRepresentation img              Handle operations with data here                          Note  Data is Swift 3 class  Use Data instead of NSData with   Swift 3   Generic image operations  like png  amp  jpg both    if let img   UIImage named   TestImage png        UIImage named   TestImage jpg           if let data Data   UIImagePNGRepresentation img                   handleOperationWithData data  data                 else if let data Data   UIImageJPEGRepresentation img  1 0                   handleOperationWithData data  data                            func handleOperationWithData data  Data            Handle operations with data here         if let image   UIImage data  data               Use image               By using extension   extension UIImage        var pngRepresentationData  Data            return UIImagePNGRepresentation img             var jpegRepresentationData  Data            return UIImageJPEGRepresentation self  1 0                   if let img   UIImage named   TestImage png        UIImage named   TestImage jpg         if let data   img pngRepresentationData                 handleOperationWithData data  data               else if let data   img jpegRepresentationData                 handleOperationWithData data  data                         func handleOperationWithData data  Data            Handle operations with data here         if let image   UIImage data  data               Use image

[objective-c] convert UIImage to NSData

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