我正在使用storyboard和
Xcode 6来设计应用程序视图但我面临这个问题：我想为纵向和横向模式分配不同的子视图位置.例如：
从现在开始,我已经通过willRotateToInterfaceOrientation和状态栏以编程方式实现了这一目标,以获得ipad方向.
使用Xcode 6,用于纵向和横向的iPhone布局是不同的,但对于iPad(常规,常规)是相同的.有可能通过限制来实现这些位置吗？
是的,你可以通过约束来做到这一点.
首先,您需要为superview创建约束,而不是最近的视图.相邻视图将改变位置,因此我们不希望约束相对于其他视图.有关如何设置约束的示例,请参阅下面的屏幕截图.
接下来,将您要修改的约束链接到IBOutlets,以便我们可以以编程方式修改它们.对于您的示例,这些将是约束：
- @IBOutlet var greenViewTrailingConstraint: NSLayoutConstraint!
- @IBOutlet var greenViewBottomConstraint: NSLayoutConstraint!
- @IBOutlet var redViewTopConstraint: NSLayoutConstraint!
- @IBOutlet var redViewLeadingConstraint: NSLayoutConstraint!
- @IBOutlet var redViewBottomConstraint: NSLayoutConstraint!
- @IBOutlet var blueViewTrailingConstraint: NSLayoutConstraint!
- @IBOutlet var blueViewTopConstraint: NSLayoutConstraint!
- @IBOutlet var blueViewLeadingConstraint: NSLayoutConstraint!
最后,根据UIInterfaceOrientation更新约束常量.再次,使用您的示例,代码看起来像这样：
- override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation,duration: NSTimeInterval) {
- let padding: CGFloat = 16.0
- // since we're calling this before the rotation,the height and width are swapped
- let viewHeight = self.view.frame.size.width
- let viewWidth = self.view.frame.size.height
- // if landscape
- if UIInterfaceOrientationIsLandscape(toInterfaceOrientation) {
- greenViewTrailingConstraint.constant = (viewWidth/2.0) + (padding/2.0)
- greenViewBottomConstraint.constant = padding
- blueViewTopConstraint.constant = (viewHeight/2.0) + (padding/2.0)
- blueViewTrailingConstraint.constant = padding
- blueViewLeadingConstraint.constant = (viewWidth/2.0) + (padding/2.0)
- redViewTopConstraint.constant = padding
- redViewBottomConstraint.constant = (viewHeight/2.0) + (padding/2.0)
- redViewLeadingConstraint.constant = (viewWidth/2.0) + (padding/2.0)
- } else { // else portrait
- greenViewBottomConstraint.constant = (viewHeight/2.0) + (padding/2.0)
- greenViewTrailingConstraint.constant = padding
- blueViewTopConstraint.constant = (viewHeight/2.0) + (padding/2.0)
- blueViewTrailingConstraint.constant = (viewWidth/2.0) + (padding/2.0)
- blueViewLeadingConstraint.constant = padding
- redViewLeadingConstraint.constant = (viewWidth/2.0) + (padding/2.0)
- redViewBottomConstraint.constant = padding
- redViewTopConstraint.constant = (viewHeight/2.0) + (padding/2.0)
- }
- }
