Is it possible to find the file extension of a UIImage ?

file-extension, image-file, ios, objective-c, uiimage

Solution

You can, change image to `NSData` by using `UIImageJPEGRepresentation(<#UIImage *image#>, <#CGFloat compressionQuality#>)` OR `UIImagePNGRepresentation(<#UIImage *image#>)` method. Call it in this way:

- (void) yourMethod{
    NSData *imageData = UIImagePNGRepresentation(yourImage);
    NSString *str = [self contentTypeForImageData:imageData];

}

- (NSString *)contentTypeForImageData:(NSData *)data {
    uint8_t c;
    [data getBytes:&c length:1];

    switch (c) {
        case 0xFF:
                return @"image/jpeg";
        case 0x89:
                return @"image/png";
        case 0x47:
                return @"image/gif";
        case 0x49:
            break;
        case 0x42:
            return @"image/bmp";
        case 0x4D:
            return @"image/tiff";
    }
    return nil;
}

Problem

Original source

Related problems

• Finding image type from NSData or UIImage