Programowo przewijaj UIScrollView

Jeśli chcesz kontrolować czas trwania i styl animacji, możesz to zrobić:

[UIView animateWithDuration:2.0f delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
    scrollView.contentOffset = CGPointMake(x, y);
} completion:NULL];

Dostosuj czas trwania (2.0f) i opcje (UIViewAnimationOptionCurveLinear) do smaku!

Innym sposobem jest

scrollView.contentOffset = CGPointMake(x,y);

Z animacją w języku Swift

scrollView.setContentOffset(CGPointMake(x, y), animated: true)

Swift 3

   let point = CGPoint(x: 0, y: 200) // 200 or any value you like.
    scrollView.contentOffset = point

scrollView.setContentOffset(CGPoint(x: y, y: x), animated: true)

[Scrollview setContentOffset:CGPointMake(x, y) animated:YES];

- (void)viewDidLoad
{
    [super viewDidLoad];
    board=[[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.height, 80)];
    board.backgroundColor=[UIColor greenColor];
    [self.view addSubview:board];
    // Do any additional setup after loading the view.
}


-(void)viewDidLayoutSubviews
{


    NSString *str=@"ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    index=1;
    for (int i=0; i<20; i++)
    {
        UILabel *lbl=[[UILabel alloc]initWithFrame:CGRectMake(-50, 15, 50, 50)];
        lbl.tag=i+1;
        lbl.text=[NSString stringWithFormat:@"%c",[str characterAtIndex:arc4random()%str.length]];
        lbl.textColor=[UIColor darkGrayColor];
        lbl.textAlignment=NSTextAlignmentCenter;
        lbl.font=[UIFont systemFontOfSize:40];
        lbl.layer.borderWidth=1;
        lbl.layer.borderColor=[UIColor blackColor].CGColor;
        [board addSubview:lbl];
    }

    [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(CallAnimation) userInfo:nil repeats:YES];

    NSLog(@"%d",[board subviews].count);
}


-(void)CallAnimation
{

    if (index>20) {
        index=1;
    }
    UIView *aView=[board viewWithTag:index];
    [self doAnimation:aView];
    index++;
    NSLog(@"%d",index);
}

-(void)doAnimation:(UIView*)aView
{
    [UIView animateWithDuration:10 delay:0 options:UIViewAnimationOptionCurveLinear  animations:^{
        aView.frame=CGRectMake(self.view.frame.size.height, 15, 50, 50);
    }
                     completion:^(BOOL isDone)
     {
         if (isDone) {
             //do Somthing
                        aView.frame=CGRectMake(-50, 15, 50, 50);
         }
     }];
}

Pokazuję, jak stworzyć prosty widok przewijania za pomocą dwóch UIView i dodać pewne ograniczenia układu automatycznego, aby przewijał się płynnie.

Zakładam, że masz pusty kontroler widoku w main.storyboard.

1.Dodaj UIView .

let view = UIView()
    view.backgroundColor = UIColor.green
    self.view.addSubview(view)
    view.translatesAutoresizingMaskIntoConstraints = false
    top = view.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0)
    left = view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 0)
    right = view.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0)
    bottom = view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0)
    height = view.heightAnchor.constraint(equalToConstant: self.view.frame.height)
    NSLayoutConstraint.activate([top, right, left, height, bottom])

2.Dodaj ScrollView.

let scroll = UIScrollView()
    scroll.backgroundColor = UIColor.red
    view.addSubview(scroll)
    scroll.translatesAutoresizingMaskIntoConstraints = false
    top = scroll.topAnchor.constraint(equalTo: view.topAnchor, constant: 10)
    left = scroll.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0)
    right = scroll.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0)
    bottom = scroll.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -10)
    NSLayoutConstraint.activate([top, right, left, bottom])

3.Dodaj pierwszy UILabel .

 let l2 = UILabel()
        l2.text = "Label1"
        l2.textColor = UIColor.black
        l2.backgroundColor = UIColor.blue
        scroll.addSubview(l2)
        l2.translatesAutoresizingMaskIntoConstraints = false
        top = l2.topAnchor.constraint(equalTo: scroll.topAnchor, constant: 10)
        left = l2.leadingAnchor.constraint(equalTo: scroll.leadingAnchor, constant: 10)
        height = l2.heightAnchor.constraint(equalToConstant: 100)
        right = l2.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -10)
        NSLayoutConstraint.activate([top, left, right, height])

4.Dodaj Drugi UILabel .

let l1 = UILabel()
    l1.text = "Label2"
    l1.textColor = UIColor.black
    l1.backgroundColor = UIColor.blue
    scroll.addSubview(l1)
    l1.translatesAutoresizingMaskIntoConstraints = false
    top = l1.topAnchor.constraint(equalTo: scroll.topAnchor, constant: 1000)
    left = l1.leadingAnchor.constraint(equalTo: scroll.leadingAnchor, constant: 10)
    bottom = l1.bottomAnchor.constraint(equalTo: scroll.bottomAnchor, constant: -10)
    height = l1.heightAnchor.constraint(equalToConstant: 100)
    right = l1.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -10)
    NSLayoutConstraint.activate([left, bottom, right, height, top])