问UIButton高度随屏幕大小变化

EN

- (void)configureScrollViewHierarchyAndApplyConstraint
{
    CGFloat mainScreenHeight = [[UIScreen mainScreen] bounds].size.height;

    // here baseScreenHeight is default screen height size for which we are implementing.
    CGFloat baseScreenHeight = 667; // here default iPhone 6 height

    // Note: try by changing baseScreenHeight via any iPhone screen height(480, 568, 667, 736) and see the changes in button height & space

    // here fixed space and height are fixed size with respect to iPhone 6 height.
    CGFloat fixedSpace = 28;
    CGFloat fixedHeight = 150;

    // ratio is responsible to increase or decrease button height depends on iPhone device size.
    CGFloat ratio = mainScreenHeight/baseScreenHeight;

    CGFloat baseSpace = fixedSpace * ratio;
    CGFloat baseHeight = fixedHeight * ratio;

    // prepare scrollView for autolayout
    UIScrollView *scrollView = [UIScrollView prepareNewViewForAutoLayout];
    scrollView.backgroundColor = [UIColor brownColor];
    [self.view addSubview:scrollView];

    // prepare containerView for autolayout
    UIView *containerView = [UIView prepareNewViewForAutoLayout];
    containerView.backgroundColor = [UIColor colorWithWhite:1 alpha:0.95];
    [scrollView addSubview:containerView];

    // To add Leading and Trailing constraint
    [scrollView applyLeadingAndTrailingPinConstraintToSuperviewWithPadding:baseSpace];
    // To add Top and Bottom constraint
    [scrollView applyTopAndBottomPinConstraintToSuperviewWithPadding:baseSpace];

    // To add Top and Bottom constraint of containerView
    [containerView applyTopAndBottomPinConstraintToSuperviewWithPadding:0];

    // To Define the containerView X Position by adding HorizontalCenter constraint
    [containerView applyConstraintForHorizontallyCenterInSuperview];

    // Here To Define the width 
    [containerView applyEqualWidthPinConstrainToSuperview]; // Or
    //[containerView applyLeadingPinConstraintToSuperviewWithPadding:10];

    NSInteger count  = 20;
    UIButton *previousContentButton = nil;

    for (NSInteger i = 0; i < count; i++)
    {
        UIButton *contentButton = [UIButton prepareNewViewForAutoLayout];
        if (i&1) {
            [contentButton setBackgroundColor:[UIColor greenColor]];
        }else{
            [contentButton setBackgroundColor:[UIColor redColor]];
        }

        [contentButton setTag:i];
        [containerView addSubview:contentButton];

        // Define the contentButton Size
        [contentButton applyLeadingAndTrailingPinConstraintToSuperviewWithPadding:baseSpace];
        [contentButton applyHeightConstraint:baseHeight];

        if (i == 0) // for first
        {
            // To add top constraint
            [contentButton applyTopPinConstraintToSuperviewWithPadding:baseSpace];
        }
        else if (i == count-1) // for last
        {
            // To add vertical constraint between two buttons
            [previousContentButton applyConstraintFromSiblingViewAttribute:NSLayoutAttributeBottom toAttribute:NSLayoutAttributeTop ofView:contentButton spacing:baseSpace];

            // To add bottom constraint
            [contentButton applyBottomPinConstraintToSuperviewWithPadding:baseSpace];
        }
        else
        {
            // To add vertical constraint between two buttons
            [previousContentButton applyConstraintFromSiblingViewAttribute:NSLayoutAttributeBottom toAttribute:NSLayoutAttributeTop ofView:contentButton spacing:baseSpace];
        }

        previousContentButton = contentButton;
    }

    [containerView updateModifyConstraints];

}