'file'에 해당되는 글 1건

  1. 2010.10.23 [아이폰 앱 개발] save it as a file after downloading image
아이폰어플개발정보2010. 10. 23. 03:40
[아이폰 앱 개발] save it as a file after downloading image

Download an Image and Save it as PNG or JPEG in iPhone SDK

Here is a quick example to save an image as JPEG or PNG. In this tutorial, I’m getting the image from the Internet then I’m saving it as JPEG and PNG.

Key points:

  • NSData to retrieve the image from the URL
  • NSDocumentDirectory to find Document folder’s Path
  • UIImagePNGRepresentation to save it as PNG
  • UIImageJPEGRepresentation to save it as JPEG

        // Get an image from the URL below
        UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.objectgraph.com/images/og_logo.png"]]];
        // Let's save the file into Document folder.
        // You can also change this to your desktop for testing. (e.g. /Users/kiichi/Desktop/)
        // NSString *deskTopDir = @"/Users/kiichi/Desktop";
        NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        // If you go to the folder below, you will find those pictures
        NSLog(@"saving png");
        NSString *pngFilePath = [NSString stringWithFormat:@"%@/test.png",docDir];
        NSData *data1 = [NSData dataWithData:UIImagePNGRepresentation(image)];
        [data1 writeToFile:pngFilePath atomically:YES];
        NSLog(@"saving jpeg");
        NSString *jpegFilePath = [NSString stringWithFormat:@"%@/test.jpeg",docDir];
        NSData *data2 = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0f)];//1.0f = 100% quality
        [data2 writeToFile:jpegFilePath atomically:YES];
        NSLog(@"saving image done");
        [image release];

Download Sample XCode Project from here


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