[아이폰] Download an Image and save it as PNG or JPEG in iphone

http://iphoneappsmaker.tistory.com/645

   NSLog(@"Downloading...");
        // Get an image from the URL below
        UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.objectgraph.com/images/og_logo.png"]]];
 
        NSLog(@"%f,%f",image.size.width,image.size.height);
 
        // 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(@"%@",docDir);
 
        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];




아래의 클래스를 이용하여 이미지를 저장!

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

Download Sample XCode Project from here