ios - ios自动布局中的VFL，如何完全填充 super View

Question

我现在正在学习autolayout的VFL。我通过执行

将 View ( aview) 添加到 super View ( bview) 中

bview.addSubView(aview)

我希望我的aview填充整个bview，所以我的代码是:

    bview.addSubview(aview);
    aview.setTranslatesAutoresizingMaskIntoConstraints(false)
    bview.setTranslatesAutoresizingMaskIntoConstraints(false)
    var lays = NSLayoutConstraint.constraintsWithVisualFormat("|-0-[aview]-0-|", options:NSLayoutFormatOptions.allZeros , metrics: nil, views: ["aview":aview] as NSDictionary)
    bview.addConstraints(lays);
    lays = NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[aview]-0-|", options:NSLayoutFormatOptions.allZeros , metrics: nil, views: ["aview":aview] as NSDictionary)

但是这段代码不能正确运行。我错过了什么吗？

Answer 1

您不需要-0-。只是简单地一无所有。例如:

bview.addSubview(aview);
aview.setTranslatesAutoresizingMaskIntoConstraints(false)
var lays = NSLayoutConstraint.constraintsWithVisualFormat("|[aview]|", options:NSLayoutFormatOptions.allZeros , metrics: nil, views: ["aview":aview] as NSDictionary)
bview.addConstraints(lays);
lays = NSLayoutConstraint.constraintsWithVisualFormat("V:|[aview]|", options:NSLayoutFormatOptions.allZeros , metrics: nil, views: ["aview":aview] as NSDictionary)