使用自动布局使UIView全屏

Question

我开始使用自动布局，并且我的UIViewController的self.view不再占用iPhone 6或iPhone 6plus的整个屏幕。 UIView的大小是size =推断的。

我已经查看了我的VC的主视图的约束条件，并且约束编辑器不让我选择我想要的距离为0,0,0,0的顶部，左侧，右侧和底部窗口边缘的视图。

Answer 1

我做了一个函数来添加一个白色面具下一个UIView（如果你是子类的UIView）

func addBackgroundMask(){ 
    backgroundMask = UIView() 
    backgroundMask?.backgroundColor = UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 0.6) 
    backgroundMask?.setTranslatesAutoresizingMaskIntoConstraints(false) 

    let topConstraint = NSLayoutConstraint(item: backgroundMask!, attribute:NSLayoutAttribute.Top, relatedBy:NSLayoutRelation.Equal, toItem:superview, attribute:NSLayoutAttribute.Top, multiplier:1.0, constant:0.0) 

    let bottomConstraint = NSLayoutConstraint(item: backgroundMask!, attribute:NSLayoutAttribute.Bottom, relatedBy:NSLayoutRelation.Equal, toItem:superview, attribute:NSLayoutAttribute.Bottom, multiplier:1.0, constant:0.0) 

    let leftConstraint = NSLayoutConstraint(item: backgroundMask!, attribute:NSLayoutAttribute.Left, relatedBy:NSLayoutRelation.Equal, toItem:superview, attribute:NSLayoutAttribute.Left, multiplier:1.0, constant:0.0) 

    let rightConstraint = NSLayoutConstraint(item: backgroundMask!, attribute:NSLayoutAttribute.Right, relatedBy:NSLayoutRelation.Equal, toItem:superview, attribute:NSLayoutAttribute.Right, multiplier:1.0, constant:0.0) 

    superview?.insertSubview(backgroundMask!, belowSubview: self) 

    superview?.addConstraint(topConstraint) 
    superview?.addConstraint(bottomConstraint) 
    superview?.addConstraint(leftConstraint) 
    superview?.addConstraint(rightConstraint) 

}