获取 image 的名字

-(void)change
{
int randNum = rand() % (4 - 0) + 0;
[_imgView setImage:[UIImage imageNamed:[imgArray objectAtIndex:randNum]]];
[_imgView.image setAccessibilityIdentifier:[imgArray objectAtIndex:randNum]];
}

- (IBAction)currentImgName:(id)sender {
NSLog(@"image name is %@", [_imgView.image accessibilityIdentifier]);