a UIView category for calculateDynamicHeight

UIView+ZDCalculateDynamicHeight

- (CGFloat)calculateDynamicHeightWithMaxWidth:(CGFloat)maxWidth {
    self.translatesAutoresizingMaskIntoConstraints = NO;
    CGFloat viewMaxWidth = maxWidth ? : CGRectGetWidth([UIScreen mainScreen].bounds);
    NSLayoutConstraint *widthConstraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:viewMaxWidth];
    
    [self addConstraint:widthConstraint];
    CGSize fittingSize = [self systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    [self removeConstraint:widthConstraint];
    
    return fittingSize.height;
}