iphone - NSUserDefaults 仅在首次启动时显示窗口

Question

我试图在第一次启动时显示一个窗口(它成功地做到了)，该窗口上有一个按钮(用于测试目的)，用于设置 bool firstLaunch = NO。由于某种原因，按下按钮后， View 不会消失。

应用程序委托(delegate)

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"]);
}

已修复:

- (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;
}

Answer 1

也许我是盲目的，但你的按钮操作中没有一行代码来告诉它关闭 View ？它不是通灵的——除非你告诉它，它怎么知道要消除 View !

PS 您还会遇到逻辑问题来确定这是否是第一次运行 - 我敢打赌每次都会显示 View :)