이미지 파일의 정보 가져오기

- (IBAction)touchedImageInfo:(id)sender {

    

    NSData *imagedata = [NSData dataWithContentsOfFile:_fileUrl];

    CGImageSourceRef source = CGImageSourceCreateWithData((CFMutableDataRef)imagedata, NULL);

    CFDictionaryRef dictRef = CGImageSourceCopyPropertiesAtIndex(source,0,NULL);

    NSDictionary* metadata = (__bridge NSDictionary *)dictRef;

    

    //NSLog(@"%@", metadata);

    CGFloat width = [metadata[@"PixelWidth"] floatValue];

    CGFloat height = [metadata[@"PixelHeight"] floatValue];

    

    NSMutableString *message = [[NSMutableString alloc] init];

    [message appendFormat:@"\n종류 : %@\n", [_fileUrl pathExtension]];

    [message appendFormat:@"크기 : %.01f KB\n", (float)imagedata.length/1024.f];

    [message appendFormat:@"해상도 : %d x %d\n", (int)width, (int)height];

    

    UIAlertController * alert = [UIAlertController

                                 alertControllerWithTitle:@"파일 정보"

                                 message:message

                                 preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* yesButton = [UIAlertAction

                                actionWithTitle:@"확인"

                                style:UIAlertActionStyleDefault

                                handler:^(UIAlertAction * action) {

                                }];

    [alert addAction:yesButton];

    [[Util topViewController] presentViewController:alert animated:YES completion:^{

        CFRelease(source);

        CFRelease(dictRef);

    }];

}