ios - Cannot determine when UIImageView frames are equal

Question

I have two layers. The bottom layer consists of hidden UIImageViews, the upper layer consists of visible UIImageViews. When all the frames of the bottom layer UIImageViews are equal to the frames of the upper layer UIImageViews, you have to see that in a NSLog.

The problem is that the boolean method which is called by a NSTimer always returns true immediately, so I see the NSLog. I only want to see the NSLog when all corresponding frames are equal to each other.

This is my code:

- (void)checkTheFrames {
    BOOL allEquals = [self isEqualFrames];
    if (allEquals) {
        NSLog(@"ALL THE FRAMES ARE EQUAL");
        [AllPosCorrectTimer invalidate];
    }
}

-(BOOL)isEqualFrames {
    for(int i = 0; i < arrayImg.count; i++ ){
        UIImageView *ImageView1 = arrayImg[i];
        UIImageView *ImageView2 = HiddenFieldView[i];
        if (!CGRectEqualToRect(ImageView1.frame, ImageView2.frame)) {
            return NO;
        }
    }
    return YES;
}

Is there a way to solve this issue?