Unity 双击Esc或者返回退出游戏,有文字提示

1 usingUnityEngine;
2 usingSystem.Collections;
3 usingUnityEngine.UI;
7 public classExitGame : MonoBehaviour
8 {
9     [Tooltip("ExitMessage拖进来")]
10 Text ExitMessageObj;
11     float fadingSpeed = 1;
12     boolfading;
13     floatstartFadingTimep;
14 Color originalColor;
15 Color transparentColor;
16     stringsss;
17 
18     voidStart()
19 {
20         ExitMessageObj = this.GetComponent<Text>();
21         originalColor =ExitMessageObj.color;
22         transparentColor =originalColor;
23         transparentColor.a = 0;
24         ExitMessageObj.text = "再次按下返回键退出游戏";
25         ExitMessageObj.color =transparentColor;
26 }
27 
28     voidUpdate()
29 {
30         if(Input.GetKeyDown(KeyCode.Escape))
31 {
32             if (startFadingTimep == 0)
33 {
34                 ExitMessageObj.color =originalColor;
35                 startFadingTimep =Time.time;
36                 fading = true;
37 }
38             else
39 {               44                 Application.Quit();//退出游戏
45 }
46 }
47         if(fading)
48 {
49             ExitMessageObj.color = Color.Lerp(originalColor, transparentColor, (Time.time - startFadingTimep) *fadingSpeed);
50             if (ExitMessageObj.color.a < 2.0 / 255)
51 {
52                 ExitMessageObj.color =transparentColor;
53                 startFadingTimep = 0;
54                 fading = false;
55 }
56 }
57 }
58 }