问题
I have a UIButton which I've added in IB, however the view behind this button changes color and I need to switch the button's type between InfoDark and InfoLight. Bizarrely though, buttonType property is read only. So how can i switch between light and dark info buttons?
回答1:
There's no way to change the .buttonType once it's set.
You can prepare two buttons, and hide one of them depending on the background color.
回答2:
You can't set buttonType readonly property, use below may help:
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
来源：https://stackoverflow.com/questions/3080011/set-uibuttons-buttontype-programmatically