自动滚动scrollview

Question

我有个问题.我想在一个用户中显示一些内容UIScrollView.我想autoscroll在UIScrollView快速从底部到顶部(像苹果商店iPad).我试图使用DDAutoscrollview(如果有人知道),但它对我不起作用.不要让别人为我解决autoscroll一个UIScrollView？任何代码片段都会很好.

.H

@interface Interface1 : UIViewController {

    IBOutlet UIScrollView *scroller;
    IBOutlet UILabel *warnung;

}

@property (nonatomic, retain) IBOutlet UIScrollView* scrollView;

.M

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    CGPoint bottomOffset = CGPointMake(self.scrollView.contentOffset.x, 
                                       self.scrollView.contentSize.height - 
                                         self.scrollView.bounds.size.height);
    [self.scrollView setContentOffset:bottomOffset animated:NO];

    CGPoint newOffset = self.scrollView.contentOffset;
    newOffset.y = 0;
    [self.scrollView setContentOffset:newOffset animated:YES];
}

- (void)viewDidLoad {        
    [scroller setScrollEnabled:YES];
    [scroller setContentSize:CGSizeMake(320, 420)];    
    [super viewDidLoad];
}

谢谢.

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>为了TOBI给予的AWNSER大家!

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Answer 1

只是用 setContentOffset:animated:

UIScrollView *scrollView = ...;
CGPoint newOffset = scrollView.contentOffset;
newOffset.y = 0;
[scrollView setContentOffset:newOffset animated:YES];

编辑:

要像使用某种开始动画一样使用它,你可以在scrollView的视图控制器中执行此操作:

- (void)viewDidLoad
{
    [super viewDidLoad];

    // ...

    CGPoint bottomOffset = CGPointMake(self.scrollView.contentOffset.x, self.scrollView.contentSize.height - self.scrollView.bounds.size.height);
    [self.scrollView setContentOffset:bottomOffset animated:NO];
}
- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    CGPoint newOffset = self.scrollView.contentOffset;
    newOffset.y = 0;
    [self.scrollView setContentOffset:newOffset animated:YES];
}

编辑2/3:

要使滚动更慢,请使用:

- (void)viewDidLoad
{
    [super viewDidLoad];

    // ...

    CGPoint bottomOffset = CGPointMake(self.scrollView.contentOffset.x, self.scrollView.contentSize.height - self.scrollView.bounds.size.height);
    [self.scrollView setContentOffset:bottomOffset animated:NO];
}


- (void)viewDidAppear:(BOOL)animated
{    
    [super viewDidAppear:animated];

    float scrollDuration = 4.0;

    [UIView animateWithDuration:scrollDuration animations:^{
        self.scrollView.contentOffset = CGPointMake(self.scrollView.contentOffset.x, 0);
    }];
}