Which method and function is called first when any iOS application start?

I suppose its

int main(int argc, char *argv[])

in main.m file

But for practical purposes I think you usually need to implement some of the UIApplicationDelegate's methods, depending on situation:

application:didFinishLaunchingWithOptions:
applicationDidBecomeActive:
applicationWillEnterForeground:

If A View starts up, then it's:

- (void)viewDidLoad {}

If an app starts up it's:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:

- (void)applicationWillEnterForeground:(UIApplication *)application {

I think you'l be better of using the ViewDidLoad Method.

I hope i helped!

actually:

- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}

comes before:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}

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