AXStateButton is a simple UIButton subclass that offers state-based button customization akin to that of Apple's. The idea is nothing fancy, but can be used as the building blocks to create something a bit more complex. All it takes to get started is:

AXStateButton *button = [AXStateButton button];

// some arbitrary customizations
[button setCornerRadius:0.0f forState:UIControlStateNormal];
[button setCornerRadius:6.0f forState:UIControlStateSelected];
[button setCornerRadius:6.0f forState:UIControlStateHighlighted | UIControlStateSelected];

[button setTransformRotationZ:0 forState:UIControlStateNormal];
[button setTransformRotationZ:M_PI_4 forState:UIControlStateSelected];

// customize the rest of your button...

[self.view addSubview:button];

• Tint color
• Background color
• Alpha
• Title alpha
• Image alpha
• Corner radius
• Border color
• Border width
• Transform rotation (x, y, z)
• Transform scale
• Shadow color
• Shadow opacity
• Shadow offset
• Shadow radius
• Shadow path

• Custom view for state

You can also adjust the animation duration of your state transitions:

button.controlStateAnimationDuration = 0.1;

On top of that, you can change the timing function used when animating control state changes:

button.controlStateAnimationTimingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

Or, you can disable animations all together:

button.animateControlStateChanges = NO;

For convenience, it's possible to access your set values:

CGFloat cornerRadius = [button cornerRadiusForState:UIControlStateHighlighted | UIControlStateSelected];
// great success!

If you see a bug, you are welcome to open a Github issue and I will attempt to get to it as soon as I can. Of course, you are also welcome to fork the repo and create a pull request with your changes. I'd be happy to look them over!