NSUserDefaults只在首次启动时显示窗口 [英] NSUserDefaults to present window only on first launch

问题描述

我试图获得一个窗口显示（它成功做到了）首次启动，在该窗口上有一个按钮（为测试目的），设置bool firstLaunch = NO。

i am trying to get a window to show (which it successfully does) on first launch, there is a button on that window (for testing purposes) that sets the bool firstLaunch = NO. for some reason, after pressing the button, the view is not dismissed.

应用程式代表

userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:firstLaunch forKey:@"firstLaunch"];
newViewController = [[NewView alloc]init];
newViewController.appDelegateOutlet = self;
[userDefaults synchronize];
if ([userDefaults boolForKey:@"firstLaunch"]) {
    NSLog(@"first launch");
   [_window addSubview:newViewController.view];
    [userDefaults synchronize];
}
if (![userDefaults boolForKey:@"firstLaunch"]) {

    [userDefaults synchronize];
    NSLog(@"not first launch");

按钮

-(IBAction)dismissFirstLaunch:(id)sender{
NSLog(@"%@",appDelegateOutlet);
appDelegateOutlet.firstLaunch = NO;
[appDelegateOutlet.userDefaults setBool:appDelegateOutlet.firstLaunch forKey:@"firstLaunch"];
[appDelegateOutlet.userDefaults synchronize];
NSLog(@"%@",[appDelegateOutlet.userDefaults objectForKey:@"firstLaunch"]);
}

固定：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{  

userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:firstLaunch forKey:@"firstLaunch"];
newViewController = [[NewView alloc]init];
newViewController.appDelegateOutlet = self;
[userDefaults synchronize];
if ([userDefaults boolForKey:@"firstLaunch"]) {
    NSLog(@"YE BOY!!");
   [_window addSubview:newViewController.view];
    [userDefaults synchronize];

}
else 

    [self continueLaunch];

return YES;
}

推荐答案

但是没有一行代码在你的按钮的动作，以告诉它关闭视图？这不是psychic - 它会知道如何解除视图，除非你告诉它！

Maybe I'm being blind but there's not a line of code in your button's action to tell it to dismiss the view? It's not psychic - how would it know to dismiss the view unless you tell it to!

PS你也将遇到问题的逻辑，以确定它是否第一次 - 我敢打赌，视图每次都显示：）

PS You're also going to run into problems with your logic to determine if it's the first run - I bet the view is being shown every time :)

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