Swift NSLayout不均匀对齐

Question

我试图在Swift中以编程方式使用autolayout。但是我有一个问题。我希望我的view1（红色框）与superview（H：| - [view1] - |）“有一个规则的间距对齐。这适用于右对齐而不是左边。我想要视图的左侧与右侧具有相同的间距。视图似乎想要与下面的按钮水平对齐。是否有人知道如何解决这个或我做错了什么？

   override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "yolo"
        let frame = UIScreen.mainScreen().bounds
        var b  = UIButton.buttonWithType(UIButtonType.System) as! UIButton
        b.frame = CGRectMake(frame.minX + 50, frame.minY + 100, frame.width * 0.8, frame.height * 0.2)
        b.backgroundColor = UIColor.purpleColor()
        b.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)

        b.layer.cornerRadius = 17
        b.setTitle("hello", forState: UIControlState.Normal)
        b.setTranslatesAutoresizingMaskIntoConstraints(false)


        // Do any additional setup after loading the view, typically from a nib.


        let view1 = UIView()
        view1.setTranslatesAutoresizingMaskIntoConstraints(false)
        view1.backgroundColor = UIColor.redColor()

        let view2 = UIView()
        view2.setTranslatesAutoresizingMaskIntoConstraints(false)
        view2.backgroundColor = UIColor.yellowColor()


        self.view.addSubview(b)
        self.view.addSubview(view1)
       // dictionary for views
        let viewsDictionary = ["view1":view1,"view2":view2, "b":b]


        let button_constraint_H:Array = NSLayoutConstraint.constraintsWithVisualFormat("H:[b(>=200)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
        let button_constraint_V:Array = NSLayoutConstraint.constraintsWithVisualFormat("V:[b(>=200)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)

        b.addConstraints(button_constraint_H as [AnyObject])
        b.addConstraints(button_constraint_V as [AnyObject])

        //view1
        let view1_constraint_H:Array = NSLayoutConstraint.constraintsWithVisualFormat("H:[view1(50)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
        let view1_constraint_V:Array = NSLayoutConstraint.constraintsWithVisualFormat("V:[view1(50)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)

        view1.addConstraints(view1_constraint_H as [AnyObject])
        view1.addConstraints(view1_constraint_V as [AnyObject])


        let view_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-[view1]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
        let view_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:|-90-[view1]-[b]-0-|", options: NSLayoutFormatOptions.AlignAllLeading, metrics: nil, views: viewsDictionary)
        let view_constraint_H2:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|[b]|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)

        view.addConstraints(view_constraint_H2 as [AnyObject])
        view.addConstraints(view_constraint_V as [AnyObject])
        view.addConstraints(view_constraint_H as [AnyObject])

}

Answer 1

问题是你的约束毫无意义。你这么说：

"H:[view1(50)]"
"H:|-[view1]-|"

一方面，您希望view1与其超级视图的边距对齐（这是-的意思），但另一方面，您希望view1成为(50)正好50个点（这就是(new UploadPhotoFragment()).show(getFragmentManager(), null); 的含义）。你不能同时拥有这两个！