WEBVTT 00:00.080 --> 00:00.620 Hello guys. 00:00.620 --> 00:01.490 Welcome to the video. 00:01.490 --> 00:06.590 We had quite a good amount of practice with the character, with a rigid body, with the velocity controls, 00:06.590 --> 00:09.920 animator, coroutine and a couple of other things. 00:09.920 --> 00:14.990 Now in this video I want to teach you some other important things we need to learn, and they are especially 00:14.990 --> 00:17.450 helpful for such game as a platformer. 00:17.450 --> 00:21.380 And we're going to start by talking about Singleton, what is it, how to use it. 00:21.380 --> 00:25.370 And also, I think it's a very good time for this because we need to make a game manager and we're going 00:25.370 --> 00:26.870 to use it in the future a lot. 00:26.870 --> 00:30.320 So let's click right button, create C sharp script. 00:30.320 --> 00:33.020 And we're going to type Game Manager. 00:33.020 --> 00:37.070 And because it has this Game manager name it's going to get this cool icon. 00:43.260 --> 00:43.770 Yeah. 00:43.770 --> 00:44.700 Very cool. 00:44.730 --> 00:50.100 Now let's make an empty object and let's name it as Game Manager. 00:50.100 --> 00:55.470 And to make it more recognizable, I'm going to put three stars at the start and three stars in the 00:55.470 --> 00:57.900 end, so it's easy to find in the hierarchy. 00:58.320 --> 01:02.430 Now let's drag this game manager on the game manager and let's do reset. 01:02.670 --> 01:04.980 So this game object will be empty. 01:04.980 --> 01:07.500 Most of the time it's only going to have this script. 01:07.500 --> 01:09.750 Game manager and game manager can be used for. 01:09.750 --> 01:13.440 So many things can be used for getting reference of the player. 01:13.440 --> 01:15.690 Can be used for respawning the player. 01:15.690 --> 01:21.120 Uh, keeping score of the fruits you collected or coins, restarting the game, saving the game. 01:21.120 --> 01:22.860 So many things can be done here. 01:22.860 --> 01:25.620 In this script we're going to start with simple. 01:26.600 --> 01:29.810 We're going to make it accessible to any script in the game. 01:29.810 --> 01:34.730 So any script in the game in the future can just say, game manager, give me this. 01:34.850 --> 01:38.060 To do that, we need to turn this into a singleton. 01:38.060 --> 01:39.350 It is very easy to do. 01:39.380 --> 01:47.090 We just need to type public static game manager instance, and then we need to open a week. 01:47.090 --> 01:51.440 And in the awake we need to type instance equals to this. 01:51.710 --> 01:53.030 Let's save this. 01:53.030 --> 01:53.990 Let's. 01:54.850 --> 02:01.030 Give unity time to recompile everything, and now even the player does not have direct connection to 02:01.030 --> 02:01.960 the game manager. 02:01.960 --> 02:05.500 Player can use game manager for whatever it needs. 02:05.500 --> 02:09.190 I'm just going to give you an example on how it's going to work, and we're going to use this a lot 02:09.190 --> 02:15.070 in the future so we can do this game manager dot instance, and then we can do anything we need from 02:15.070 --> 02:16.000 a game manager. 02:16.000 --> 02:18.520 As an example, let's make a public method. 02:19.940 --> 02:20.930 Public void. 02:20.930 --> 02:23.630 Let's say, uh, score. 02:23.630 --> 02:24.740 I'm just going to name it a score. 02:24.740 --> 02:26.450 It's going to give me debug log. 02:27.110 --> 02:29.180 You have five points. 02:31.230 --> 02:31.920 Simple as that. 02:31.920 --> 02:33.270 So it is a public method. 02:33.270 --> 02:34.680 It is in the game manager. 02:35.610 --> 02:39.000 And again, player is not connected to game manager in any way. 02:39.000 --> 02:40.020 We don't have a reference. 02:40.020 --> 02:45.240 We have nothing and we can do something like this Game Manager instance score. 02:45.240 --> 02:47.280 We can call the method from a game manager. 02:48.080 --> 02:50.150 And it will work just like that. 02:53.400 --> 02:54.690 You can see a message. 02:54.690 --> 02:56.010 You have five points. 02:56.010 --> 02:58.440 And this method directs us to game Manager. 02:58.440 --> 03:00.450 We're going to use this couple of times in the future. 03:00.450 --> 03:05.340 We're going to use this as a main point where we can connect everything that we need to be connected. 03:05.340 --> 03:09.270 Now let's remove this method and let's do something else here. 03:09.270 --> 03:13.950 In the future, we're going to need a reference to the player, and we can get reference to the player 03:13.950 --> 03:15.330 in many different ways. 03:15.330 --> 03:22.020 One of them is to make a public player script player, just going to call it like that. 03:22.020 --> 03:25.200 And then on the game manager over here. 03:25.990 --> 03:27.910 We can assign player. 03:28.240 --> 03:29.020 What is it? 03:29.470 --> 03:30.580 Oh, I remove the method. 03:30.580 --> 03:31.210 Okay. 03:32.000 --> 03:33.980 Let's erase it and save it. 03:37.010 --> 03:40.850 So on the game manager over here, we can assign a player just like that. 03:40.850 --> 03:47.270 And now, whenever we need reference to the player, we can type game manager, dot instance, dot player. 03:47.300 --> 03:48.800 Let's do a quick example. 03:48.800 --> 03:52.130 Why not let's make empty object and let's do new script. 03:52.520 --> 03:54.950 I'm just going to call it new object. 03:55.830 --> 03:57.780 Just an example that we're going to delete later. 03:57.780 --> 03:59.460 So let's do this at the start. 03:59.460 --> 04:05.310 Let's do debug log game manager instance player transform position. 04:05.730 --> 04:07.320 Now we have a third script. 04:07.320 --> 04:13.380 And this script will get position of the player because we have player information saved on the game 04:13.380 --> 04:14.820 manager over here. 04:14.820 --> 04:21.270 And because this game manager is a public static instance which makes it a singleton, we can get position 04:21.270 --> 04:22.080 of the player. 04:22.080 --> 04:23.730 Let's go and try this. 04:28.010 --> 04:28.460 Yeah. 04:28.460 --> 04:31.310 We see a message -14 minus six zero zero. 04:31.310 --> 04:35.120 If we select the player, we can see same numbers over here. 04:35.420 --> 04:36.500 Very cool. 04:36.500 --> 04:38.030 Now let's delete this. 04:38.030 --> 04:41.210 Uh, an object that was just to show you the example. 04:41.210 --> 04:42.830 Let's delete this script. 04:42.950 --> 04:49.130 And we need to go to game manager and make sure that we only have one instance of a game manager in 04:49.130 --> 04:49.820 the game. 04:49.820 --> 04:52.550 To do that, we're going to do a simple check in their wake. 04:52.550 --> 04:59.420 If instance equals to null means we don't have any instance yet, then we can do instance equals to 04:59.420 --> 05:00.380 this. 05:00.380 --> 05:04.850 Then we can do else destroy game object. 05:06.420 --> 05:10.260 Now we're going to save it and we're going to go to unity and try this out. 05:10.290 --> 05:13.890 I'm going to select my game manager and I'm going to click duplicate. 05:13.890 --> 05:15.390 So we have two of them. 05:15.390 --> 05:18.780 Then when we go to play mode you're going to see what is going to happen. 05:19.350 --> 05:19.740 Boom. 05:19.740 --> 05:21.090 One of them was deleted. 05:21.090 --> 05:21.870 Just what we need. 05:21.870 --> 05:26.280 So we only have one game manager in the game at all times. 05:26.280 --> 05:27.300 Very nice. 05:27.300 --> 05:28.530 That's all what we need to do. 05:28.530 --> 05:29.970 Let's delete this extra. 05:29.970 --> 05:33.150 Let's save the project and let's go to the next video.