スクロールボタンで作成したいのでUIScrollView
、ユーザーが左矢印ボタンを押すと、スクロールが適切にスクロールする必要があります。
問題は、ボタンを3回すばやくクリックすると、スクロールが正しくスクロールできないことです( の呼び出しが多いためscrollRectToVisible
)。次のアニメーションの前に現在のアニメーションを停止できますか?
PS[self scrollScrollViewToIndex:index animated:NO]
すべてが正常に機能するように設定すると、アニメーションが必要になります
これが私のコードです:
- (void)scrollScrollViewToIndex:(int)index animated:(BOOL)animated
{
NSLog(@"scrolled to index: %d", index);
CGFloat offsetX = CGRectGetWidth(_scrollMain.frame) * index;
CGRect scrollRect = CGRectMake(offsetX, 0, CGRectGetWidth(_scrollMain.frame), CGRectGetHeight(_scrollMain.frame));
[_scrollMain scrollRectToVisible:scrollRect animated:animated];
// [self.scrollMain setContentOffset:CGPointMake(offsetX, 0) animated:animated];
}
- (IBAction)leftArrowPressed:(id)sender
{
int indexOfVoucher = [_arrayVouchers indexOfObject:_voucher];
indexOfVoucher--;
self.voucher = [_arrayVouchers objectAtIndex:indexOfVoucher];
[self updateViewWithVoucherWithScrolling:YES];
}
- (IBAction)rightArrowPressed:(id)sender
{
int indexOfVoucher = [_arrayVouchers indexOfObject:_voucher];
indexOfVoucher++;
self.voucher = [_arrayVouchers objectAtIndex:indexOfVoucher];
[self updateViewWithVoucherWithScrolling:YES];
}
- (void)updateViewWithVoucherWithScrolling:(BOOL)withScrolling
{
int indexOfVoucher = [_arrayVouchers indexOfObject:_voucher];
_leftArrowButton.hidden = _rightArrowButton.hidden = NO;
if (indexOfVoucher == 0)
{
_leftArrowButton.hidden = YES;
}
else if (indexOfVoucher == [_arrayVouchers count] - 1)
{
self.rightArrowButton.hidden = YES;
}
if (withScrolling)
{
[self scrollScrollViewToIndex:indexOfVoucher animated:YES];
}
}
更新: Mar0ux のアドバイスによる作業コード
- (void)scrollScrollViewToIndex:(int)index animated:(BOOL)animated
{
NSLog(@"scrolled to index: %d", index);
CGFloat offsetX = CGRectGetWidth(_scrollMain.frame) * index;
if (animated)
{
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationCurveEaseInOut | UIViewAnimationOptionBeginFromCurrentState //Multiple options
animations:^ {
// [self.scrollMain setContentOffset:CGPointMake(offsetX, 0) animated:NO];
CGRect scrollRect = CGRectMake(offsetX, 0, CGRectGetWidth(_scrollMain.frame), CGRectGetHeight(_scrollMain.frame));
[_scrollMain scrollRectToVisible:scrollRect animated:NO];
}
completion:^ (BOOL finished) {
}];
}
else
{
CGRect scrollRect = CGRectMake(offsetX, 0, CGRectGetWidth(_scrollMain.frame), CGRectGetHeight(_scrollMain.frame));
[_scrollMain scrollRectToVisible:scrollRect animated:NO];
}
}