AutoLayout约束不影响childViewController

Question

在我的viewController应用程序中，当我将一个childViewController添加到另一个iOS应用程序时，autolayout约束并不影响视图。

有任何方法可以获得ChildViewController约束并将它们添加到supperView中吗？

Answer 1

我找到了一个解决办法：

view.addSubview(svc.view)

let vd: [NSObject:AnyObject] = ["svc": svc.view]
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-0-[svc]-0-|", options: NSLayoutFormatOptions.allZeros, metrics: nil, views: vd))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[svc]-0-|", options: NSLayoutFormatOptions.allZeros, metrics: nil, views: vd))

svc.didMoveToParentViewController(self)

来自：https://gist.github.com/radianttap/4455176

Answer 2

我相信您需要像这样手动添加约束到您的childViewController；

UIViewController *newVC = [UIViewController new];
[self addChildViewController:newVC];
[self.view addSubview:newVC.view];

newVC.view.translatesAutoresizingMaskIntoConstraints = NO;

NSLayoutConstraint *bottomContstraint =[NSLayoutConstraint
                                        constraintWithItem:newVC.view
                                        attribute:NSLayoutAttributeBottom
                                        relatedBy:NSLayoutRelationEqual
                                        toItem:self.view
                                        attribute:NSLayoutAttributeBottom
                                        multiplier:1.0
                                        constant:0];

NSLayoutConstraint *topConstraint =[NSLayoutConstraint
                                    constraintWithItem:newVC.view
                                    attribute:NSLayoutAttributeTop
                                    relatedBy:NSLayoutRelationEqual
                                    toItem:self.view
                                    attribute:NSLayoutAttributeTop
                                    multiplier:1.0
                                    constant:0];

NSLayoutConstraint *leftConstraint =[NSLayoutConstraint
                                     constraintWithItem:newVC.view
                                     attribute:NSLayoutAttributeLeft
                                     relatedBy:NSLayoutRelationEqual
                                     toItem:self.view
                                     attribute:NSLayoutAttributeLeft
                                     multiplier:1.0
                                     constant:0];

NSLayoutConstraint *rightConstraint =[NSLayoutConstraint
                                      constraintWithItem:newVC.view
                                      attribute:NSLayoutAttributeRight
                                      relatedBy:NSLayoutRelationEqual
                                      toItem:self.view
                                      attribute:NSLayoutAttributeRight
                                      multiplier:1.0
                                      constant:0];

[self.view addConstraint:bottomContstraint];
[self.view addConstraint:topConstraint];
[self.view addConstraint:leftConstraint];
[self.view addConstraint:rightConstraint];

我自己也用过这个，它看起来很管用，但是一个更有经验的开发人员可能会给你一些不同的东西，但我希望这会有所帮助！