Implementation of ScrollView Auto-scrolling in iOS

http://bbs.csdn.net/topics/390347330

The original problem is, I want to show the user's content in the ScrollView, so that the content from the end of the automatic scrolling, I started with the Ddautoscrollview, but can not be achieved.

One solution see below, more solutions see: http://ask.csdn.net/questions/374

. h file

Objective C Code?

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@interfaceInterface1 : UIViewController{     IBOutletUIScrollView*scroller;    IBOutletUILabel*warnung;}@property(nonatomic, retain) IBOutletUIScrollView* scrollView;

. m file

Objective C Code?

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- (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)];        [superviewDidLoad];}

Using setcontentoffset:animated:

Objective C Code?

1234	UIScrollView*scrollView = ...;CGPoint newOffset = scrollView.contentOffset;newOffset.y = 0;[scrollView setContentOffset:newOffset animated:YES];

If you need the effect of an opening animation, the Viewcontroller implementation in ScrollView

Objective C Code?

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- (void)viewDidLoad{    [superviewDidLoad];    // ...    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{    [superviewDidAppear:animated];    CGPoint newOffset = self.scrollView.contentOffset;    newOffset.y = 0;    [self.scrollView setContentOffset:newOffset animated:YES];}

Move slowly, using the timer to achieve:

Objective C Code?

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- (void)viewDidLoad{    [superviewDidLoad];    // ...    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{        [superviewDidAppear:animated];    CGPoint bottomOffset = CGPointMake(self.scrollView.contentOffset.x, self.scrollView.contentSize.height - self.scrollView.bounds.size.height);    //设置延迟时间    floatscrollDurationInSeconds = 4.0;    //计算timer间隔    floattotalScrollAmount = bottomOffset.y;    floattimerInterval = scrollDurationInSeconds / totalScrollAmount;    [NSTimerscheduledTimerWithTimeInterval:timerInterval target:selfselector:@selector(scrollScrollView:) userInfo:nilrepeats: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;}

Implementation of ScrollView Auto-scrolling in iOS