Delay introduced while presenting UIViewController - ios

Question

I am developing application in which I am presenting new UIViewController from another using [self performSegueWithIdentifier:#"newViewSegue" sender:self];
In new UIViewController I am initialising my view elements and adding UITableView programmatically to it.
But when I call this performSegueWithIdentifier new UIViewController is displayed after some delay, I tried to put log in viewDidLoad of new UIViewController and before [self performSegueWithIdentifier:#"newViewSegue" sender:self]; statement both statements are executed immediately but view is displayed after some interval.
My ViewDidLoad method is as follow:
-(void)viewDidLoad{
sharedObject=[SingleToneClass sharedManager];
selectedButtonTag=-1;
initFlag=0;
NSLog(#"End %#",[NSDate date]);
backgroundView.backgroundColor=[self hexToUiColor:#"E7E7E7"];
[mondayDateButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
//set colour for all 7days buttons
[mondayDateButton.titleLabel setFont:[UIFont boldSystemFontOfSize:14]];
//Set font for all days button
[mondayButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
//set title colour
[mondayButton.titleLabel setFont:[UIFont systemFontOfSize:12]];
//set font
//Changing image Color
//Home Button
[homeButton.titleLabel setFont:[UIFont fontWithName:kFontAwesomeFamilyName size:40]];
[homeButton setTitleColor:[self hexToUiColor:sharedObject.secondaryHexColorCode] forState:UIControlStateNormal];
[homeButton setTitle:[NSString fontAwesomeIconStringForIconIdentifier:#"fa-home"] forState:UIControlStateNormal];
//Back Button
[backButton.titleLabel setFont:[UIFont fontWithName:kFontAwesomeFamilyName size:27]];
[backButton setTitleColor:[self hexToUiColor:sharedObject.secondaryHexColorCode] forState:UIControlStateNormal];
[backButton setTitle:[NSString fontAwesomeIconStringForIconIdentifier:#"fa-chevron-left"] forState:UIControlStateNormal];
//Next Week Button
[nextWeek.titleLabel setFont:[UIFont fontWithName:kFontAwesomeFamilyName size:20]];
[nextWeek setTitleColor:[self hexToUiColor:sharedObject.secondaryHexColorCode] forState:UIControlStateNormal];
[nextWeek setTitle:[NSString fontAwesomeIconStringForIconIdentifier:#"fa-chevron-right"] forState:UIControlStateNormal];
//Previous Week Button
[previousWeek.titleLabel setFont:[UIFont fontWithName:kFontAwesomeFamilyName size:20]];
[previousWeek setTitleColor:[self hexToUiColor:sharedObject.secondaryHexColorCode] forState:UIControlStateNormal];
[previousWeek setTitle:[NSString fontAwesomeIconStringForIconIdentifier:#"fa-chevron-left"] forState:UIControlStateNormal];
[separatorLineView setBackgroundColor:[self hexToUiColor:#"6D6D6D"]];
[selectLabel setTextColor:[self hexToUiColor:#"6D6D6D"]];
[selectLabel setFont:[UIFont boldSystemFontOfSize:13]];
selectLabel.text=[NSString stringWithFormat:#"%#",selectedTitle];
sharedObject.bookADateTitle=selectedTitle;
//make Buttons Rounded
mondayDateButton.clipsToBounds = YES;
mondayDateButton.layer.cornerRadius = mondayDateButton.frame.size.height/2;
NSDate *currentDate;
if (sharedObject.bookDateViewDate.length>0) {
NSDateFormatter *dateFormat1 = [[NSDateFormatter alloc] init];
[dateFormat1 setDateFormat:#"yyyy-MM-dd"];
currentDate=[dateFormat1 dateFromString:sharedObject.bookDateViewDate];
}
else{
currentDate=[NSDate date];
}
[self setDate:currentDate];
[self setDateToLabel:currentDate]; //set formatted date
//create and initialise UITableView
static NSString *cellIdentifier=#"CustomHiddenViewCell";
CustomHiddenViewCell *cell = (CustomHiddenViewCell *)[slotsTableView dequeueReusableCellWithIdentifier:cellIdentifier];
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"CustomHiddenViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
double heightOfTable=(self.view.frame.size.height-backgroundView.frame.size.height);
//creating tableview1
slotsTableView=[[UITableView alloc]initWithFrame:CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y+backgroundView.frame.size.height,self.view.frame.size.width,heightOfTable)];
slotsTableView.scrollEnabled=YES;
slotsTableView.delegate=self;
[slotsTableView flashScrollIndicators];
slotsTableView.dataSource=self;
slotsTableView.bounces=NO;
slotsTableView.showsVerticalScrollIndicator=YES;
slotsTableView.separatorStyle=UITableViewCellSeparatorStyleNone;
[self.view addSubview:slotsTableView];
//add swipe gesture
UISwipeGestureRecognizer *leftSwipRecognizer;
leftSwipRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(SwipeRecognizer:)];
[leftSwipRecognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
[slotsTableView addGestureRecognizer:leftSwipRecognizer];
UISwipeGestureRecognizer *rightSwipRecognizer;
rightSwipRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(SwipeRecognizer:)];
[rightSwipRecognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
[slotsTableView addGestureRecognizer:rightSwipRecognizer];
[leftWeekRecognizer addTarget:self action:#selector(WeekSwipeRecognizer:)];
[leftWeekRecognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
[rightWeekRecognizer addTarget:self action:#selector(WeekSwipeRecognizer:)];
[rightWeekRecognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
}
Can anyone tell me why this delay is introduced?

Answer 1

May be your code is executing in other then main thread, move your code in main thread or use GCD like
dispatch_async(dispatch_get_main_queue(), ^(void){
//Run UI Updates
});