转自http://blog.csdn.net/justinjing0612/article/details/7306836?reload
在didFinishLaunchingWithOptions方法中加入如下代码:
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]){ [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"]; NSLog(@"第一次启动"); }else{ NSLog(@"已经不是第一次启动了"); }
现在的APP中流行在程序第一次启动时显示一些新手引导页面,下面的代码可用于判断此APP是否第一次启动,或升级后的第一次启动。
#define LAST_RUN_VERSION_KEY @"last_run_version_of_application" - (BOOL) isFirstLoad{ NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"]; NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString *lastRunVersion = [defaults objectForKey:LAST_RUN_VERSION_KEY]; if (!lastRunVersion) { [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY]; return YES; // App is being run for first time } else if (![lastRunVersion isEqualToString:currentVersion]) { [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY]; return YES; // App has been updated since last run } return NO; }
参考:
Check for first use
app 新手引导设计
Top 6 Help Design Patterns for iPhone Apps