问题
I need to work with a subclassed UIToolbar in the UINavigationController. I know this can be done via Interface Builder but I need it to be done programatically.
The docs state that the UINavigationController toolbar property is readonly so I'm at a bit of a loss as to how I proceed.
Related:
- Custom UINavigationController UIToolbar Background Image
回答1:
A new init* method has been available since iOS 5
- (instancetype)initWithNavigationBarClass:(Class)navigationBarClass
toolbarClass:(Class)toolbarClass
Also don't forget
... you are responsible for adding a root view controller before presenting the navigation controller onscreen.
来源：https://stackoverflow.com/questions/15767217/custom-uinavigationcontroller-uitoolbar-subclass