判斷第一次使用App (NSUserDefaults)

專案 appdelegate.m 中“application:didFinishLaunchingWithOptions:” 方法

if (![[NSUserDefaults standardUserDefaults] boolForKey:@"everLaunched"]) {

    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"everLaunched"];

    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];

}

else{

    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"firstLaunch"];

}







在程式需要判斷的部分加入以下代碼：

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) { 

    // 這裡判斷是否第一次 

    UIAlertView * alert =[[UIAlertView alloc] initWithTitle:@"第一次"  

                                                  message:@"進入App" 

                                                 delegate:self  

                                        cancelButtonTitle:@"我知道了"  

                                        otherButtonTitles:nil]; 

    [alert show]; 

    [alert release]; 

       

}