[英]View doesn't update after changing constraints programmatically
I want to change the relation of a constraint programmatically that is why I create a new one and replace the old one with it. 我想以编程方式更改约束的关系,这就是为什么我创建一个新约束并将其替换为旧约束的原因。 I have an IBOutlet of my constraint which I want to change.
我有一个要更改的约束的IBOutlet。 As because I am using multi-os-engine my code for updating the constraint looks a little bit different to normal objectiv-c or swift.
因为我使用的是multi-os-engine,所以我更新约束的代码看起来与普通的objectiv-c或swift有点不同。
setBasketTopConstraint(
NSLayoutConstraint.constraintWithItemAttributeRelatedByToItemAttributeMultiplierConstant(
basketTopConstraint().firstItem(),
basketTopConstraint().firstAttribute(),
NSLayoutRelation.LessThanOrEqual,
basketTopConstraint().secondItem(),
basketTopConstraint().secondAttribute(),
basketTopConstraint().multiplier(),
basketTopConstraint().constant()
)
);
My problem is, that I can't see any effect from changing the constraint. 我的问题是,更改约束后看不到任何影响。 It seems like I need to refresh my view somehow.
似乎我需要以某种方式刷新自己的观点。 I called
view().setNeedsLayout()
and view().layoutIfNeeded()
but with no success. 我调用了
view().setNeedsLayout()
和view().layoutIfNeeded()
但没有成功。
Any advice? 有什么建议吗?
You need to ensure that you: 您需要确保自己:
layoutIfNeeded()
layoutIfNeeded()
您是否尝试添加代码以更改视图将布局子视图的约束?
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