2 lianlianbushell lianlianbushell 于 2012.11.07 10:10 提问

自动滚动scrollview的问题

我的问题是,我要展现给用户的内容放在scrollview中,让内容从上到底自动滚动,我最开始用的是DDAutoscrollview,没实现,哪位好心人帮帮忙吧。不胜感激。

.h文件

 @interface Interface1 : UIViewController {

    IBOutlet UIScrollView *scroller;
    IBOutlet UILabel *warnung;

}


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

.m文件

- (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];
}

thanks

1个回答

prettYYoyic
prettYYoyic   2012.11.07 11:01
已采纳

使用setContentOffset:animated:

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

如果你想要开场动画的效果,在scrollView的viewcontroller实现

- (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];
}

补充:

移动的慢点,用timer实现:

- (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 bottomOffset = CGPointMake(self.scrollView.contentOffset.x, self.scrollView.contentSize.height - self.scrollView.bounds.size.height);

    //设置延迟时间
    float scrollDurationInSeconds = 4.0;

    //计算timer间隔


    float totalScrollAmount = bottomOffset.y;
    float timerInterval = scrollDurationInSeconds / totalScrollAmount;

    [NSTimer scheduledTimerWithTimeInterval:timerInterval target:self selector:@selector(scrollScrollView:) userInfo:nil repeats:YES];
}

- (void)scrollScrollView:(NSTimer *)timer
{
    CGPoint newScrollViewContentOffset = self.scrollView.contentOffset;

    //向上移动 1px
    newScrollViewContentOffset.y -= 1;


    newScrollViewContentOffset.y = MAX(0, newScrollViewContentOffset.y);

    //如果到顶了,timer中止
    if (newScrollViewContentOffset.y == 0) {
        [timer invalidate];
    }

    //最后设置scollView's contentOffset
    self.scrollView.contentOffset = newScrollViewContentOffset;
}
lianlianbushell
lianlianbushell 再次感谢!!thank you so mucn~~~
接近 5 年之前 回复
prettYYoyic
prettYYoyic 不用谢,要用viewDidLoad 方法实现滚动到底部
接近 5 年之前 回复
lianlianbushell
lianlianbushell 太感谢你了~~~~~~~(>_<)~~~~
接近 5 年之前 回复
prettYYoyic
prettYYoyic 我补充上了,你看看
接近 5 年之前 回复
lianlianbushell
lianlianbushell 移动的慢点。。什么时候出现快慢无所谓
接近 5 年之前 回复
prettYYoyic
prettYYoyic 是要出现的慢点还是移动的慢点?
接近 5 年之前 回复
lianlianbushell
lianlianbushell 谢谢,不过还想问你知道怎么让它移动的慢一点么?移动的太快了~
接近 5 年之前 回复
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