let searchBar = UISearchBar(frame: CGRectMake(0, 64, view.frame.size.width, 40))
        searchBar.barStyle = .Default
        searchBar.placeholder = "请输入一些内容"
        searchBar.showsCancelButton = true
        searchBar.showsSearchResultsButton = true
        searchBar.tintColor = UIColor.orangeColor()
        searchBar.showsScopeBar = true
        searchBar.scopeButtonTitles = ["分组1", "分组2"]
        searchBar.selectedScopeButtonIndex = 1
        searchBar.delegate = self
        
        view.addSubview(searchBar)

    // 是否应该开始编辑
    func searchBarShouldBeginEditing(searchBar: UISearchBar) -> Bool {
        return true
    }
    
    // 搜索栏开始编辑的回调
    func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
        print("begin editing")
    }
    
    // 是否应该结束编辑
    func searchBarShouldEndEditing(searchBar: UISearchBar) -> Bool {
        return true
    }
    
    // 搜索栏结束编辑的回调
    func searchBarTextDidEndEditing(searchBar: UISearchBar) {
        print("end editing")
    }
    
    // 当搜索栏内的文字发生变化时调用，返回是否允许改变。
    func searchBar(searchBar: UISearchBar, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
        print("\(range), \(text)")
        return true
    }
    
    // 取消按钮点击事件
    func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        print("cancel button click")
        searchBar.text = nil
        searchBar.resignFirstResponder()
    }
    
    // 点击了搜索按钮的回调
    func searchBarSearchButtonClicked(searchBar: UISearchBar) {
        print("search button click")
        searchBar.resignFirstResponder()
    }
    
    // 搜索结果列表按钮被点击
    func searchBarResultsListButtonClicked(searchBar: UISearchBar) {
        print("results list click")
    }
    
    // 当搜索栏的内容已经发生变化时调用
    func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
        print(searchText)
    }
    
    // 点击了附加视图按钮后调用
    func searchBar(searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
        print(selectedScope)
    }