欢迎界面仅首次打开时出现，即数据持久化的应用

来源：互联网发布：mac air 使用教程编辑：程序博客网时间：2024/06/06 02:04

NSString *path = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES).lastObjectstringByAppendingPathComponent:@"hasEntered.plist"];

if ([NSStringstringWithContentsOfFile:pathencoding:NSUTF8StringEncodingerror:nil] ==nil)

{

[@"no"writeToFile:pathatomically:YESencoding:NSUTF8StringEncodingerror:nil];

}

if ([[NSStringstringWithContentsOfFile:pathencoding:NSUTF8StringEncodingerror:nil]isEqualToString:@"yes"])

{

self.window.rootViewController = [[UINavigationControlleralloc]initWithRootViewController:[[LoginViewControlleralloc]init]];

}

else

{

[@"yes"writeToFile:pathatomically:YESencoding:NSUTF8StringEncodingerror:nil];

self.window.rootViewController = [[WelcomeViewController alloc]init];

}

hasEntered.plist 来存数据，然后打开APP时读取该文件，如果文件中含有YES，则说明APP非首次打开，进而直接跳转到登录界面。

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