iOS每次版本升级后启动APP需要跳转到登录页

你们有没有这样的需求，每次升级APP后启动需要跳转到登录页。

实现代码如下：

#define APP_VERSION (NSString *)[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"]

- (BOOL)isFirstLoad {
     NSString *currentVersion = APP_VERSION;
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     NSString *lastRunVersion = [defaults objectForKey:LAST_RUN_VERSION_KEY];
     if  (!lastRunVersion) {
         [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];
         [defaults synchronize];
         return  YES;
         // App is being run for first time
     } else  if  (![lastRunVersion isEqualToString:currentVersion]) {
         [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];
         [defaults synchronize];
         return  YES;
         // App has been updated since last run
     }
     return  NO;
}