9.39.1. Brief introduction ¶
GameKit is a commonly used framework in iOS SDK. It has three core functions:
Interactive game platform Game Center
P2P device communication function
In-Game Voice .
9.39.2. Instance step ¶
1.在链接 iTunes 时请确保拥有一个唯一的 App ID（ unique App ID），App ID在我们应用程序更新 bundle ID时及在Xcode代码签名与相应的配置文件需要使用到。
2.创建新的应用程序和更新应用程序信息。在添加新的应用程序文档可以了解更多有关信息。
3.打开你申请的application,点击Manage Game Center选项。进入后点击Enable Game Center使你的Game Center生效。接下来设置自己的Leaderboard和Achievements。
4.下一步涉及处理代码，并为我们的应用程序创建用户界面。
5.创建一个single view application，并输入 bundle identifier 。
6.更新 ViewController.xib，如下所示
7.选择项目文件，然后选择目标，然后添加GameKit.framework
8.为已添加的按钮创建IBActions
9.更新ViewController.h文件，如下所示
#import <UIKit/UIKit.h>
#import <GameKit/GameKit.h>
@interface ViewController : UIViewController
<GKLeaderboardViewControllerDelegate>
-(IBAction)updateScore:(id)sender;
-(IBAction)showLeaderBoard:(id)sender;
@end
10.更新ViewController.m ，如下所示
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
if([GKLocalPlayer localPlayer].authenticated == NO)
{
[[GKLocalPlayer localPlayer]
authenticateWithCompletionHandler:^(NSError *error)
{
NSLog(@"Error%@",error);
}];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void) updateScore: (int64_t) score
forLeaderboardID: (NSString*) category
{
GKScore *scoreObj = [[GKScore alloc]
initWithCategory:category];
scoreObj.value = score;
scoreObj.context = 0;
[scoreObj reportScoreWithCompletionHandler:^(NSError *error) {
// Completion code can be added here
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:nil message:@"Score Updated Succesfully"
delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}];
}
-(IBAction)updateScore:(id)sender{
[self updateScore:200 forLeaderboardID:@"runoob"];
}
-(IBAction)showLeaderBoard:(id)sender{
GKLeaderboardViewController *leaderboardViewController =
[[GKLeaderboardViewController alloc] init];
leaderboardViewController.leaderboardDelegate = self;
[self presentModalViewController:
leaderboardViewController animated:YES];
}
#pragma mark - Gamekit delegates
- (void)leaderboardViewControllerDidFinish:
(GKLeaderboardViewController *)viewController{
[self dismissModalViewControllerAnimated:YES];
}
@end
9.39.3. Output ¶
Run the application, and the output is as follows
When we click to display the rankings, the screen displays as follows:
When we click to update the score, the score will be updated to our ranking, and we will get a message, as shown in the following figure
