iOS开发 - 控制在生命周期内只运行一次

代码实现

#define UD [NSUserDefaults standardUserDefaults]

if (![UD boolForKey:@"everLaunched"]) {
[UD setBool:YES forKey:@"everLaunched"];
[UD setBool:YES forKey:@"firstLaunch"];
}
else{
[UD setBool:NO forKey:@"firstLaunch"];
}

if ([UD boolForKey:@"firstLaunch"]) {
//第一次运行,以游客登录
do........
}