show toast type alert (Android) in iPhone (iOS)

[self.navigationItem setPrompt:@"Add photos with faces to Googlyify them!"];

Whole code for method

- (void)showToast
{
    
    double delayInSeconds = 1.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC)); // 1
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ // 2
       [self.navigationItem setPrompt:@"Add photos with faces to Googlyify them!"];        
    });
}