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Showing posts from May, 2017

Semaphore | Delay splash screen in iOS + Objective C

How to wait for an asynchronously dispatched block to finish? How to integrate semaphore in iOS? How to delay splash screen for longer time, so that developer can prefetch or execute something before start of iOS App. The answer of all the above questions is SEMAPHORE.   A  semaphore  is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multiprogramming operating system.  Suppose you want to perform some task before root view controller is shown to user.  Goto AppDelegate's method  didFinishLaunchingWithOptions , create a method as below:-  - ( BOOL )application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     [ self performTaskToDelaySplash]; } -( void ) performTaskToDelaySplash {          dispatch_semaphore_t semaphore = dispatch_semaphore_create( 0 ); //1. Create semaphore      //Perform your task he