.h文件 [plain]    @interface Interface1 : UIViewController {          IBOutlet UIScrollView *scroller;       IBOutlet UILabel *warnung;      }         @property (nonatomic, retain) IBOutlet UIScrollView* scrollView;     .m文件 [plain]   - (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];   }     使用setContentOffset:animated: [plain]   UIScrollView *scrollView = ...;   CGPoint newOffset = scrollView.contentOffset;   newOffset.y = 0;   [scrollView setContentOffset:newOffset animated:YES];     如果需要開場動畫的效果，在scrollView的viewcontroller實現 [plain]   - (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];   }     移動的慢點，用timer實現： [plain]   - (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);          //設置延遲時間       float scrollDurationInSeconds = 4.0;          //計算timer間隔             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;          //向上移動 1px       newScrollViewContentOffset.y -= 1;             newScrollViewContentOffset.y = MAX(0, newScrollViewContentOffset.y);          //如果到頂了，timer中止       if (newScrollViewContentOffset.y == 0) {           [timer invalidate];       }          //最後設置scollView's contentOffset       self.scrollView.contentOffset = newScrollViewContentOffset;   }