我将scrollView设置为titleView的{{1}}。 navigationBar的{{1}}中有4个按钮，所有按钮都是动态布局的。这些按钮需要通过拖动和滚动来取消，因此我在contentView时将它们分类到scrollView。
当我尝试滚动scrollView时，只要我越过superview的边界（即传递bottom或top bounds navigationBar），scrollview'跳过'8或11像素，这取决于它是否是顶部或按钮。它与setEnabled:NO有关，因为当我使用touchesMoved时问题不会持续存在。
相关代码：
Scrollview初始化：
UIButtons按钮初始化（-layoutMenu）：
UILabels跳过时，按钮上没有调用任何事件， menuWidth = 196;
rowHeight = 40;
rowMargin = self.frame.size.height - rowHeight;
//drop down menu stuff
self.scrollView = [[UIScrollView alloc] initWithFrame:self.frame];
scrollView.backgroundColor = [UIColor clearColor];
scrollView.contentSize = CGSizeMake(self.frame.size.width, (self.frame.size.height)*choices.count);
scrollView.pagingEnabled = YES;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.clipsToBounds = YES;
scrollView.canCancelContentTouches = YES;
scrollView.delaysContentTouches = YES;
scrollView.delegate = self;
[self layoutMenu];
[self addSubview:scrollView];
[scrollView release];
只发生正常看似SKScrollableButton *tempButton;
NSString *text;
for (int i = 0; i < choices.count; i++) {
text = (NSString*)[choices objectAtIndex:i];
if (i == 0) {
text = [text stringByAppendingString:downArrow];
}
CGRect labelRect = CGRectMake(0, i*(rowHeight + rowMargin), menuWidth, rowHeight - 7);
tempButton = [[SKScrollableButton alloc] initWithFrame:labelRect];
[tempButton setTitle:text forState:UIControlStateNormal];
[tempButton addTarget:self action:@selector(buttonDown:) forControlEvents:UIControlEventTouchDown];
[tempButton addTarget:self action:@selector(buttonUpInside:) forControlEvents:UIControlEventTouchUpInside];
[self.scrollView addSubview:tempButton];
[tempButton release];
}
委托调用。
我已经测试过了，并且在传递superview的边界时肯定会跳过，而不是scrollViewDidScroll本身的边界。