如何使用SWIFT以編程方式添加約束從上周開始，我一直在努力解決這個問題，但沒有更進一步。好吧，所以我需要申請一些約束 以編程方式在……里面斯威夫特轉(zhuǎn)到UIView使用此代碼：var new_view:UIView! = UIView(frame: CGRectMake(0, 0, 100, 100));new_view.backgroundColor = UIColor.redColor();view.addSubview(new_view);var constX:NSLayoutConstraint = NSLayoutConstraint(item: new_view, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0);self.view.addConstraint(constX);var constY:NSLayoutConstraint = NSLayoutConstraint(item: new_view, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0);self.view.addConstraint(constY);var constW:NSLayoutConstraint = NSLayoutConstraint(item: new_view, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: new_view, attribute: NSLayoutAttribute.Width, multiplier: 1, constant: 0);self.view.addConstraint(constW);var constH:NSLayoutConstraint = NSLayoutConstraint(item: new_view, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: new_view, attribute: NSLayoutAttribute.Height, multiplier: 1, constant: 0);self.view.addConstraint(constH);
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慕姐8265434
TA貢獻1813條經(jīng)驗 獲得超2個贊
view.translatesAutoresizingMaskIntoConstraints = false
let attributes: [NSLayoutAttribute] = [.top, .bottom, .right, .left]
NSLayoutConstraint.activate(attributes.map {
NSLayoutConstraint(item: view, attribute: $0, relatedBy: .equal, toItem: view.superview, attribute: $0, multiplier: 1, constant: 0)
})view.translatesAutoresizingMaskIntoConstraints = false view.topAnchor.constraint(equalTo: view.superview!.topAnchor).isActive = true view.bottomAnchor.constraint(equalTo: view.superview!.bottomAnchor).isActive = true view.leadingAnchor.constraint(equalTo: view.superview!.leadingAnchor, constant: 10).isActive = true view.trailingAnchor.constraint(equalTo: view.superview!.trailingAnchor, constant: 10).isActive = true
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