Method swizzling in Swift

Question

There is a little problem with UINavigationBar which I\'m trying to overcome. When you hide the status bar using prefersStatusBarHidden() method in

Answer 1

The first problem I faced was Swift extension can't have stored properties.

First of all, categories in Objective-C also cannot have stored properties (called synthesized properties). The Objective-C code you linked to uses a computed property (it provides explicit getters and setters).

Anyway, getting back to your problem, you cannot assign to your property because you defined it as a read-only property. To define a read-write computed property, you would need to provide a getter and setter like this:

var fixedHeightWhenStatusBarHidden: Bool {
    get {
        return objc_getAssociatedObject(self, "FixedNavigationBarSize").boolValue
    }
    set(newValue) {
        objc_setAssociatedObject(self, "FixedNavigationBarSize", NSNumber(bool: newValue), UInt(OBJC_ASSOCIATION_RETAIN))
    }
}