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我有一个水平分页UIScrollView设置有两个页面。在scrollview中有一个“内容视图”，其中设置了约束条件，使其成为scrollview的“内容大小”。内容视图包含两个子视图，第一页和第二页。这工作正常，我可以在两页之间水平页面。没有垂直的“反弹”，因为页面正好填满了内容大小。UITextView里面的UIScrollView
我还没有添加任何东西到第一页，但是我在第二页添加了一个UITextView。此文本视图具有约束设置，以便它在第二页居中，并适合第二页。意图是，这只会显示短暂的blurb，因此scrollEnabled在文本视图中设置为NO。文字应该很容易地放在空间内而不会被切断。
我在文本视图中放置了一些虚拟文本，一切正常。然后，我稍微增加了字体。尽管文本仍然很容易放入允许的空间内，但我现在会在滚动视图上收到一个垂直“反弹” - 就好像内容大小现在垂直较大（或者插入已更改）。我已经检查过这些，并且它们与字体更改之前的字体完全一样。文本视图的内在内容大小稍大（因为字体大小增加），但同样在限制范围内。什么导致了垂直反弹？
这里是代码建立的意见和约束。请注意，这是在表视图单元格（c）内。 setInfoPager是水平分页滚动视图，并且是单元格contentView的子视图。
UIView *contentView = [[UIView alloc] init];
contentView.translatesAutoresizingMaskIntoConstraints = NO;
[c.setInfoPager addSubview:contentView];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeRight
multiplier:1.f
constant:0.f]];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeLeft
multiplier:1.f
constant:0.f]];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeTop
multiplier:1.f
constant:0.f]];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeBottom
multiplier:1.f
constant:0.f]];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeWidth
multiplier:2.0
constant:0.f]];
[c.setInfoPager addConstraint:[NSLayoutConstraint constraintWithItem:contentView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:c.setInfoPager
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0.f]];
UIView *pageOne = [[UIView alloc] init];
pageOne.translatesAutoresizingMaskIntoConstraints = NO;
[contentView addSubview:pageOne];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageOne
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeHeight
multiplier:1.f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageOne
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeWidth
multiplier:0.5f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageOne
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeLeft
multiplier:1.f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageOne
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.f
constant:0.f]];
UIView *pageTwo = [[UIView alloc] init];
pageTwo.translatesAutoresizingMaskIntoConstraints = NO;
pageTwo.backgroundColor = [UIColor greenColor];
[contentView addSubview:pageTwo];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageTwo
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeHeight
multiplier:1.f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageTwo
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeWidth
multiplier:0.5f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageTwo
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeRight
multiplier:1.f
constant:0.f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:pageTwo
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.f
constant:0.f]];
UITextView *cardSetBlurb = [[UITextView alloc] init];
cardSetBlurb.scrollEnabled = NO;
cardSetBlurb.translatesAutoresizingMaskIntoConstraints = NO;
[pageTwo addSubview:cardSetBlurb];
cardSetBlurb.backgroundColor = [UIColor blackColor];
cardSetBlurb.textColor = [UIColor whiteColor];
cardSetBlurb.userInteractionEnabled = NO;
cardSetBlurb.font = [UIFont fontWithName:@"AvenirNext-Regular" size:12.f];
cardSetBlurb.text = @"blah blah blah sdfasdf dsfasdf asdfasdf asdfasdf asdfasdf asdfasdf asdfasdf something wicked this way comes";
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationGreaterThanOrEqual
toItem:pageTwo
attribute:NSLayoutAttributeLeft
multiplier:1.f
constant:0.f]];
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationGreaterThanOrEqual
toItem:pageTwo
attribute:NSLayoutAttributeTop
multiplier:1.f
constant:0.f]];
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationLessThanOrEqual
toItem:pageTwo
attribute:NSLayoutAttributeRight
multiplier:1.f
constant:0.f]];
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationLessThanOrEqual
toItem:pageTwo
attribute:NSLayoutAttributeBottom
multiplier:1.f
constant:0.f]];
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:pageTwo
attribute:NSLayoutAttributeCenterX
multiplier:1.f
constant:0.f]];
[pageTwo addConstraint:[NSLayoutConstraint constraintWithItem:cardSetBlurb
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:pageTwo
attribute:NSLayoutAttributeCenterY
multiplier:1.f
constant:0.f]];