iOS 判断App是否第一次启动

方法一、在didFinishLaunchingWithOptions方法中加入如下代码：

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]){  
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];  
//第一次启动  
}else{  
//不是第一次启动了  
}  

此处测试可以通过

[[NSUserDefaults standardUserDefaults] removeObjectForKey:key];

方法二、判断app是否第一次启动或者更新后第一次启动

#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;  
}  
else if (![lastRunVersion isEqualToString:currentVersion]) {  
[defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];  
return YES;  
}  
return NO;  
}  

此处测试可以通过

改变bundle version