[英]How to run something once when the app is launched?
我想在我的應用啟動時播放一部介紹性電影,但已經完全瘋了,我在代碼中做了很多測試,並嘗試使用它
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
NSLog(@"App started to launch");
[self.window makeKeyAndVisible];
[self.window addSubview:_intro.view];
return YES;
}
但這使我的視頻得以播放,即使我來自背景。
如果喜歡按中間按鈕,然后再按兩次中間按鈕並按應用程序圖標,我會再次播放電影。
我忘了提到這是我的ViewDidLoad
- (void)viewDidLoad
{
[super viewDidLoad];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
BOOL launchedBefore = [userDefaults boolForKey:@"hasRunBefore"];
NSLog(@"value of hasRunBefore is %d",launchedBefore);
if(!launchedBefore)
{
[userDefaults setBool:1 forKey:@"hasRunBefore"];
launchedBefore = [userDefaults boolForKey:@"hasRunBefore"];
NSLog(@"value of hasRunBefore is %d",launchedBefore);
[self playvideo];
}
}
在發送synchronize
消息之前, NSUserDefaults
不會將更改提交到磁盤。
嘗試添加這樣做:
[userDefaults setBool:YES forKey:@"hasRunBefore"];
[userDefaults synchronize];
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.