如何才能在首次发布时显示视图？ [英] How can I show a view on the first launch only?

问题描述

我使用Xcode 4.5和故事板构建了一个应用程序。应用程序第一次启动时，我希望初始视图控制器显示必须接受的条款和条件才能继续。之后，我希望应用程序启动并跳过第一个视图控制器并转到第二个。

I built an application using Xcode 4.5 with storyboards. The first time the app launches I want the initial view controller to appear with terms and conditions that must be accepted to proceed. After that, I want the app to launch and skip over the first view controller and go to the second one.

我知道我必须使用NSUserDefaults类和其他东西效果：
if（[[NSUserDefaults standard ...] boolForKey：@iHaveAcceptedTheTerms]）

I know I have to use the NSUserDefaults class and something to the effect of: if ([[NSUserDefaults standard...] boolForKey:@"iHaveAcceptedTheTerms"])

但我之前从未使用过这个类不知道如何实现此代码。有人可以分享如何做到这一点的具体细节吗？

But I have never used this class before and have no idea how to implement this code. Can someone share the specifics of how to do this?

推荐答案

你输入你的AppDelegate：

You put in in your AppDelegate:

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

//first-time ever defaults check and set
if([[NSUserDefaults standardUserDefaults] boolForKey:@"TermsAccepted"]!=YES)
{
    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"TermsAccepted"];
}

然后在rootViewController中实现条款和条件以及接受它的方法。
您必须检查条款是否被接受，例如：

Then you implement in your rootViewController the terms and conditions and a way to accept it. You will have to check if the terms are accepted, for example like this:

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"TermsAccepted"]){
    //proceed with app normally
}
else{
//show terms
}

接受后，以下代码将更改默认设置：

When accepted, the following code will change the default settings:

 if(termsaccepted){
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"TermsAccepted"];
}

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