swift method swizzle

swizzle

    public override class func initialize() {
        
        struct Static {
            static var token: dispatch_once_t = 0
        }

        if self !== RCChatListViewController.self {
            return
        }
        
        dispatch_once(&Static.token, { () -> Void in
            
            self.swizze("onSelectedTableRow:", targetFunc: "xxx_onSelectedTableRow:")
        })
        
    }
    
    class func swizze(srcFunc:String, targetFunc:String) {
        let originalSelector = Selector(srcFunc)
        let swizzledSelector = Selector(targetFunc)
        
        
        let originalMethod = class_getInstanceMethod(self, originalSelector)
        let swizzledMethod = class_getInstanceMethod(self, swizzledSelector)
        
        let didAddMethod = class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))
        
        if didAddMethod {
            class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod)
        }
    }