Question

我在项目中添加了MTCircularSlider pod。我的viewController如下所示：

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;

ENTITY ccalctb IS
END ccalctb;

ARCHITECTURE behavior OF ccalctb IS 

    -- Component Declaration for the Unit Under Test (UUT)

    COMPONENT dcalc
    PORT(
         k : IN  std_logic_vector(7 downto 0);
         o : IN  std_logic_vector(7 downto 0);
         e : IN  std_logic_vector(7 downto 0);
         d : OUT  std_logic_vector(7 downto 0);
         clk : IN  std_logic
        );
    END COMPONENT;


   --Inputs
   signal k : std_logic_vector(7 downto 0) := (others => '0');
   signal o : std_logic_vector(7 downto 0) := (others => '0');
   signal e : std_logic_vector(7 downto 0) := (others => '0');
   signal clk : std_logic := '0';

    --Outputs
   signal d : std_logic_vector(7 downto 0);

   -- Clock period definitions
   constant clk_period : time := 10 ns;

BEGIN

    -- Instantiate the Unit Under Test (UUT)
   uut: dcalc PORT MAP (
          k => k,
          o => o,
          e => e,
          d => d,
          clk => clk
        );

   -- Clock process definitions
   clk_process :process
   begin
        clk <= '0';
        wait for clk_period/2;
        clk <= '1';
        wait for clk_period/2;
   end process;


   -- Stimulus process
   stim_proc: process
   begin        
      -- hold reset state for 100 ns.
      wait for 100 ns;  
k<=x"07";
o<=x"08";
e<=x"07";
      wait for clk_period*10;

      -- insert stimulus here 

      wait;
   end process;

END;

我的用户界面如下：

我的rootView如下：

我正在使用以下代码在TabBar上加载此viewController：

class ViewController: UIViewController {

    @IBOutlet var slider: MTCircularSlider!

    @IBOutlet var sliderLabel: UILabel!

    let temperatureArray = ["7.5","8.0","8.5","9.0","9.5","10.0","10.5","11.0","11.5","12.0","12.5","13.0","13.5","14.0","14.5","15.0","15.5","16.0","16.5","17.0","17.5","18.0","18.5","19.0","19.5","20.0","20.5","21.0","21.5","22.0","22.5","23.0","23.5","24.0","24.5","25.0","25.5","26.0","26.5","27.0","27.5","28.0","28.5"]

    override func viewDidLoad() {
        super.viewDidLoad()
        self.slider.addTarget(self, action: #selector(valueChange), for: .valueChanged)

    }

    @objc func valueChange() {
        //Slider value change
        let value = Float(slider.value)
        let numberString = String(value)
        let numberComponent = numberString.components(separatedBy :".")
        let integerNumber = Int(numberComponent [0])!
        let fractionalString = numberComponent[1].prefix(1)

        var fractionalNumber:Int = Int(fractionalString)!

        if fractionalNumber >= 5 {
            fractionalNumber = 5
        }
        else {
            fractionalNumber = 0
        }

        let temperature = String(integerNumber) + "." + String(fractionalNumber)
        if temperature == "7.5" {
            sliderLabel.text = NSLocalizedString("min", comment: "")
        }
        else if temperature == "28.5" {
            sliderLabel.text = NSLocalizedString("max", comment: "")
        }
        else {
            sliderLabel.text = temperature + " °C"
        }

        if temperatureArray.contains(temperature) {
            let index = temperatureArray.firstIndex(of: temperature)

            print(index!)
        }
    }
}

当我加载viewController时，通常意味着按下此View时它可以正常工作。但是，当我在选项卡上单击添加时，则不会调用我的函数valueChange（）。请给我任何解决方案。

Answer 1

尝试

slider.addTarget(self, action: #selector(ViewController.handle(_:)), for: . valueChanged)

    // Handle Action

        @objc func handle(_ sender: AnyObject) {


    }

Answer 2

如GitHub - MTCircularSlider参考中给出的，ValueChange方法具有一个参数。可能是发送方参数。请在下面查看其代码。

self.slider?.addTarget(self, action: Selector("valueChange:"), forControlEvents: .ValueChanged)

但是您的代码似乎丢失了它。你可以尝试这样的事情吗？

@objc
func valueChange(sender: AnyObject) {

}

请让我知道这会有所帮助。

为什么addTarget不调用函数？

2 个答案: