两个视图，一个在纵向上并排排列在横向上，使用布局约束

假设我有两个文本视图。 在肖像模式下，我想这些在另一个＆在横向模式下，我想这些是并排的

是否有可能使用自动布局在故事板中使用布局约束？ 如果是，那么如何？ 如果没有，那么实现这一目标的其他更好的解决scheme是什么？

ios6是我的目标版本

Answer 1

以下是你如何在代码中去解决这个问题。

基本上你需要：

a）在UIViewController updateViewConstraints中为给定方向configuration合适的NSLayoutConstraint 。

b）当界面旋转时调用[self.view setNeedsUpdateConstraints] 。

下面是一个ViewController的实现和UIView与辅助方法的类别。

 @interface ConstraintsViewController () @property (nonatomic, weak) IBOutlet UIView *upperOrLeftView, *lowerOrRightView; @end @implementation ConstraintsViewController -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration]; [self.view setNeedsUpdateConstraints]; } -(void)updateViewConstraints { [super updateViewConstraints]; [self.view removeConstraintsRelatingToItems:@[self.upperOrLeftView,self.lowerOrRightView]]; if(UIInterfaceOrientationIsPortrait(self.interfaceOrientation)) { [self.view constrainSubview:self.upperOrLeftView usingEdgeInsets:UIEdgeInsetsMake(0, 0, -1, 0)]; [self.view constrainSubview:self.lowerOrRightView usingEdgeInsets:UIEdgeInsetsMake(-1, 0, 0, 0)]; [self.view constrainSubviewsTopToBottom:@[self.upperOrLeftView, self.lowerOrRightView]]; } else { [self.view constrainSubview:self.upperOrLeftView usingEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -1)]; [self.view constrainSubview:self.lowerOrRightView usingEdgeInsets:UIEdgeInsetsMake(0, -1, 0, 0)]; [self.view constrainSubviewsLeftToRight:@[self.upperOrLeftView, self.lowerOrRightView]]; } } @end 

把它放在UIView + Constraints.h中

 @interface UIView (Constraints) -(void)removeConstraintsRelatingToItems:(NSArray*)items; -(void)constrainSubview:(UIView*)subview usingEdgeInsets:(UIEdgeInsets)insets; -(void)constrainSubviewsLeftToRight:(NSArray*)subviews; -(void)constrainSubviewsTopToBottom:(NSArray*)subviews; @end 

这是UIView + Constraints.m

 @implementation UIView (Constraints) -(void)removeConstraintsRelatingToItems:(NSArray *)items { for(NSLayoutConstraint *constraint in self.constraints) { if([items containsObject:constraint.firstItem] || [items containsObject:constraint.secondItem]) { [self removeConstraint:constraint]; } } } /** Set up constraints to flow the subviews from top to bottom and with equal heights */ -(void)constrainSubviewsTopToBottom:(NSArray*)subviews { if(subviews.count > 1) { UIView *anchorView = subviews[0]; for(int i = 1; i < subviews.count; i++) { UIView *view = subviews[i]; NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:anchorView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:view attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0.0]; NSLayoutConstraint *edgesConstraint = [NSLayoutConstraint constraintWithItem:anchorView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:view attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]; [self addConstraints:@[heightConstraint, edgesConstraint]]; anchorView = view; } } } /** Set up constraints to flow the subviews from left to right and with equal widths */ -(void)constrainSubviewsLeftToRight:(NSArray*)subviews { if(subviews.count > 1) { UIView *anchorView = subviews[0]; for(int i = 1; i < subviews.count; i++) { UIView *view = subviews[i]; NSLayoutConstraint *widthConstraint = [NSLayoutConstraint constraintWithItem:anchorView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:view attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0.0]; NSLayoutConstraint *edgesConstraint = [NSLayoutConstraint constraintWithItem:anchorView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:view attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0]; [self addConstraints:@[widthConstraint, edgesConstraint]]; anchorView = view; } } } /** Set up constraints to anchor the various edges of the subview to it's superview (this view) using the provided insets. Any inset set to < 0.0 means that edge is ignored; */ -(void)constrainSubview:(UIView*)subview usingEdgeInsets:(UIEdgeInsets)insets { if(insets.top >= 0.0) { [self addConstraint:[NSLayoutConstraint constraintWithItem:subview attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1.0 constant:insets.top]]; } if(insets.right >= 0.0) { [self addConstraint:[NSLayoutConstraint constraintWithItem:subview attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1.0 constant:-insets.right]]; } if(insets.bottom >= 0.0) { [self addConstraint:[NSLayoutConstraint constraintWithItem:subview attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1.0 constant:-insets.bottom]]; } if(insets.left >= 0.0) { [self addConstraint:[NSLayoutConstraint constraintWithItem:subview attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1.0 constant:insets.left]]; } } @end 

Answer 2

在我看来，以多个方向布置viewController视图的最佳方法是为每个方向创buildless量的视图。 在这里我find了这个：

“当你添加一个视图控制器到故事板时，它带有一个视图，调用这个容器视图，在容器视图中添加两个视图：纵向视图和横向视图，适当地设置纵向视图和横向视图的尺寸使用尺寸检查器，根据需要为应用程序添加button，更多视图，标签或其他内容，然后当方向改变时隐藏一个视图并显示另一个视图。

Answer 3

您只能通过使用Interface Builder来实现此类行为。 您需要设置一些不同优先级的约束。

在这里看到我更详细的答案。 还有一个截屏video和一个我创build的示例应用程序的链接。