iOS11 UIToolBar Contentview

To solve the problem for iOS11 (compatible with lower versions) you only needto make layoutSubview right after UIToolBar was added as a subview to UI hierarchy.

In this case _UIToolbarContentView lowers to the first subview of UIToolBar, and you canadd all your subviews higher as before.

For example in ObjC,

    UIToolbar *toolbar = [UIToolbar new];    [self addSubview: toolbar];    [toolbar layoutIfNeeded];    <here one can add all subviews needed>

The same problem happens with slacktextviewcontroller

I have solved this problem in my case. I rewrite the layoutSubviews method in subclass of UIToobar and change the userInteractionEnable of _UIToolbarContentView into NO.

- (void)layoutSubviews {    [super layoutSubviews];    NSArray *subViewArray = [self subviews];    for (id view in subViewArray) {        if ([view isKindOfClass:(NSClassFromString(@"_UIToolbarContentView"))]) {            UIView *testView = view;            testView.userInteractionEnabled = NO;         }     }}

You can just use the hitTest(_:with:) method.

1. First, create a property contentView in UIToolbar:

   open private(set) var contentView: UIView = UIView()

2. Then, make the contentView's frame the same as the UIToolbar's. For example:

   contentView.frame = boundscontentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]addSubview(contentView)

3. Finally, override the hitTest(_:with:) method:

   open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {    if self.point(inside: point, with: event) {        if let hitTestView = contentView.hitTest(point, with: event) {            return hitTestView        } else {            return self        }    } else {        return nil    }}

In this situation, if you want to customize a toolbar by simply adding additional views, you should add them to the contentView so they will be positioned appropriately.