Ios 呈现UIViewController时引入的延迟

我正在开发一个应用程序，在该应用程序中，我使用

[self-performsguewithidentifier:@“newViewSegue”发送方：self]从另一个应用程序演示新的
UIViewController

在new
UIViewController
中，我正在初始化我的视图元素，并以编程方式向其中添加
UITableView

但是，当我调用此
performsguewithidentifier
new
UIViewController
时，我尝试在新
UIViewController
的
viewDidLoad
和
[self-performsguewithidentifier:@“newViewSegue”发送方：self]之前登录语句两个语句都立即执行，但视图在一段时间间隔后显示

我的
ViewDidLoad
方法如下：

-(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)];
}

有人能告诉我为什么会出现这种延迟吗？
可能是您的代码在主线程之外的其他线程中执行，请将代码移动到主线程中，或者像这样使用GCD

dispatch_async(dispatch_get_main_queue(), ^(void){
    //Run UI Updates
});

你的意思是我应该将我的初始化代码从
viewDidLoad
添加到
dispatch\u async（dispatch\u get\u main\u queue（），^（void）{//Run UI Updates}）如
-（void）{dispatch_async（dispatch_get_main_queue（），^（void）{//initialization}}}
是的，您可以这样做，也可以使用标识符方法执行操作！我试图使用您的解决方案，但它仍然引入了延迟显示您的did加载方法，您的代码正在生成视图程序。我已使用
viewDidLoad
方法更新了我的问题，请检查