IOS AutoLayout在旋转时更改位置

我想把一个容器放在另一个容器下面的肖像上并排放在横向上。 只有自动布局才有可能吗？ 我知道我可以通过编程方式进行，只是想知道是否可以从布局中进行。

喜欢这个：

Answer 1

那么， 对于使用iOS 8做这些事情， didRotateFromInterfaceOrientation不是首选方法。我建议你看一下traitCollection并查看与之关联的控制器方法。 这里的技巧是在UIViewController方法viewWillTransitionToSize：withTransitionCoordinator ：trigger时安装水平约束或垂直约束。

这是我做的方式，

@interface ViewController () @property (nonatomic, weak) UIView *aContainerView; @property (nonatomic, weak) UIView *bContainerView; @property (nonatomic, strong) NSArray *horizontalOrientationConstraints; @property (nonatomic, strong) NSArray *verticalOrientationConstraints; @end @implementation ViewController #pragma mark - Getters - (NSArray *)horizontalOrientationConstraints { if (!_horizontalOrientationConstraints) { NSLayoutConstraint *equalWidthConstraints = [NSLayoutConstraint constraintWithItem:self.aContainerView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.bContainerView attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0]; NSArray *vConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[aContainerView][bContainerView]|" options:NSLayoutFormatAlignAllTop | NSLayoutFormatAlignAllBottom metrics:nil views:@{@"aContainerView": self.aContainerView, @"bContainerView": self.bContainerView}]; NSArray *hConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[aContainerView]|" options:0 metrics:nil views:@{@"aContainerView": self.aContainerView}]; NSArray *constraints = [vConstraints arrayByAddingObjectsFromArray:hConstraints]; _horizontalOrientationConstraints = [constraints arrayByAddingObject:equalWidthConstraints]; } return _horizontalOrientationConstraints; } - (NSArray *)verticalOrientationConstraints { if (!_verticalOrientationConstraints) { NSLayoutConstraint *equalHeightConstraints = [NSLayoutConstraint constraintWithItem:self.aContainerView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self.bContainerView attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0]; NSArray *vConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[aContainerView][bContainerView]|" options:NSLayoutFormatAlignAllLeft | NSLayoutFormatAlignAllRight metrics:nil views:@{@"aContainerView": self.aContainerView, @"bContainerView": self.bContainerView}]; NSArray *hConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[aContainerView]|" options:0 metrics:nil views:@{@"aContainerView": self.aContainerView}]; NSArray *constraints = [vConstraints arrayByAddingObjectsFromArray:hConstraints]; _verticalOrientationConstraints = [constraints arrayByAddingObject:equalHeightConstraints]; } return _verticalOrientationConstraints; } #pragma mark - - (void)viewDidLoad { [super viewDidLoad]; UIView *aContainerView = [self viewWithLabelText:@"A" andBackgroundColor:[UIColor yellowColor]]; UIView *bContainerView = [self viewWithLabelText:@"B" andBackgroundColor:[UIColor greenColor]]; [self.view addSubview:aContainerView]; [self.view addSubview:bContainerView]; self.aContainerView = aContainerView; self.bContainerView = bContainerView; CGSize viewSize = self.view.bounds.size; if (viewSize.width > viewSize.height) { [NSLayoutConstraint activateConstraints:self.horizontalOrientationConstraints]; } else { [NSLayoutConstraint activateConstraints:self.verticalOrientationConstraints]; } } - (UIView *)viewWithLabelText:(NSString *)text andBackgroundColor:(UIColor *)color { UIView *aContainerView = [[UIView alloc] init]; aContainerView.backgroundColor = [UIColor blackColor]; aContainerView.translatesAutoresizingMaskIntoConstraints = NO; UIView *aView = [[UIView alloc] init]; aView.translatesAutoresizingMaskIntoConstraints = NO; aView.backgroundColor = color; UILabel *aLabel = [[UILabel alloc] init]; aLabel.translatesAutoresizingMaskIntoConstraints = NO; aLabel.text = text; aLabel.font = [UIFont systemFontOfSize:80]; [aView addSubview:aLabel]; [aContainerView addSubview:aView]; NSLayoutConstraint *centerXConstraints = [NSLayoutConstraint constraintWithItem:aView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:aLabel attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]; NSLayoutConstraint *centerYConstraints = [NSLayoutConstraint constraintWithItem:aView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:aLabel attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0]; [aContainerView addConstraints:@[centerXConstraints, centerYConstraints]]; NSString *hConstraintsFormat = @"V:|-10-[view]-10-|"; NSString *vConstraintsFormat = @"H:|-10-[view]-10-|"; [aContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:hConstraintsFormat options:0 metrics:nil views:@{@"view": aView}]]; [aContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:vConstraintsFormat options:0 metrics:nil views:@{@"view": aView}]]; return aContainerView; } - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator { NSArray *constraintsToDeactivate; NSArray *constraintsToActivate; if (size.width > size.height) { constraintsToActivate = self.horizontalOrientationConstraints; constraintsToDeactivate = self.verticalOrientationConstraints; } else { constraintsToActivate = self.verticalOrientationConstraints; constraintsToDeactivate = self.horizontalOrientationConstraints; } [NSLayoutConstraint deactivateConstraints:constraintsToDeactivate]; [NSLayoutConstraint activateConstraints:constraintsToActivate]; [self.view layoutIfNeeded]; } @end 

这是它如何寻找两个方向，

对于iOS7，你基本上做同样的事情。 而不是重写viewWillTransitionToSize：你应该覆盖willAnimateRotationToInterfaceOrientation：duration：。 然后在方法内添加或删除约束，

 @interface ViewController () @property (nonatomic, weak) UIView *aContainerView; @property (nonatomic, weak) UIView *bContainerView; @property (nonatomic, assign) BOOL touchExited; @property (nonatomic, assign) NSUInteger count; @property (nonatomic, weak) NSTimer *countChangeTimer; @property (nonatomic, weak) UIButton *theCountButton; @property (nonatomic, strong) NSArray *horizontalOrientationConstraints; @property (nonatomic, strong) NSArray *verticalOrientationConstraints; @end @implementation ViewController #pragma mark - Getters - (NSArray *)horizontalOrientationConstraints { if (!_horizontalOrientationConstraints) { NSLayoutConstraint *equalWidthConstraints = [NSLayoutConstraint constraintWithItem:self.aContainerView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.bContainerView attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0]; NSArray *vConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[aContainerView][bContainerView]|" options:NSLayoutFormatAlignAllTop | NSLayoutFormatAlignAllBottom metrics:nil views:@{@"aContainerView": self.aContainerView, @"bContainerView": self.bContainerView}]; NSArray *hConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[aContainerView]|" options:0 metrics:nil views:@{@"aContainerView": self.aContainerView}]; NSArray *constraints = [vConstraints arrayByAddingObjectsFromArray:hConstraints]; _horizontalOrientationConstraints = [constraints arrayByAddingObject:equalWidthConstraints]; } return _horizontalOrientationConstraints; } - (NSArray *)verticalOrientationConstraints { if (!_verticalOrientationConstraints) { NSLayoutConstraint *equalHeightConstraints = [NSLayoutConstraint constraintWithItem:self.aContainerView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self.bContainerView attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0]; NSArray *vConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[aContainerView][bContainerView]|" options:NSLayoutFormatAlignAllLeft | NSLayoutFormatAlignAllRight metrics:nil views:@{@"aContainerView": self.aContainerView, @"bContainerView": self.bContainerView}]; NSArray *hConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[aContainerView]|" options:0 metrics:nil views:@{@"aContainerView": self.aContainerView}]; NSArray *constraints = [vConstraints arrayByAddingObjectsFromArray:hConstraints]; _verticalOrientationConstraints = [constraints arrayByAddingObject:equalHeightConstraints]; } return _verticalOrientationConstraints; } #pragma mark - - (void)invalidateTimer { if (self.countChangeTimer) { [self.countChangeTimer invalidate]; } } - (void)viewDidLoad { [super viewDidLoad]; UIView *aContainerView = [self viewWithLabelText:@"A" andBackgroundColor:[UIColor yellowColor]]; UIView *bContainerView = [self viewWithLabelText:@"B" andBackgroundColor:[UIColor greenColor]]; [self.view addSubview:aContainerView]; [self.view addSubview:bContainerView]; self.aContainerView = aContainerView; self.bContainerView = bContainerView; CGSize viewSize = self.view.bounds.size; if (viewSize.width > viewSize.height) { [self.view addConstraints:self.horizontalOrientationConstraints]; } else { [self.view addConstraints:self.verticalOrientationConstraints]; } } - (UIView *)viewWithLabelText:(NSString *)text andBackgroundColor:(UIColor *)color { UIView *aContainerView = [[UIView alloc] init]; aContainerView.backgroundColor = [UIColor blackColor]; aContainerView.translatesAutoresizingMaskIntoConstraints = NO; UIView *aView = [[UIView alloc] init]; aView.translatesAutoresizingMaskIntoConstraints = NO; aView.backgroundColor = color; UILabel *aLabel = [[UILabel alloc] init]; aLabel.translatesAutoresizingMaskIntoConstraints = NO; aLabel.text = text; aLabel.font = [UIFont systemFontOfSize:80]; [aView addSubview:aLabel]; [aContainerView addSubview:aView]; NSLayoutConstraint *centerXConstraints = [NSLayoutConstraint constraintWithItem:aView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:aLabel attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]; NSLayoutConstraint *centerYConstraints = [NSLayoutConstraint constraintWithItem:aView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:aLabel attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0]; [aContainerView addConstraints:@[centerXConstraints, centerYConstraints]]; NSString *hConstraintsFormat = @"V:|-10-[view]-10-|"; NSString *vConstraintsFormat = @"H:|-10-[view]-10-|"; [aContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:hConstraintsFormat options:0 metrics:nil views:@{@"view": aView}]]; [aContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:vConstraintsFormat options:0 metrics:nil views:@{@"view": aView}]]; return aContainerView; } - (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{ NSArray *constraintsToDeactivate; NSArray *constraintsToActivate; if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) { constraintsToActivate = self.horizontalOrientationConstraints; constraintsToDeactivate = self.verticalOrientationConstraints; } else { constraintsToActivate = self.verticalOrientationConstraints; constraintsToDeactivate = self.horizontalOrientationConstraints; } [self.view removeConstraints:constraintsToDeactivate]; [self.view addConstraints:constraintsToActivate]; } @end 

Answer 2

是的，我认为会有一些代码。 所以我相信这里涉及的2个约束是水平间距和垂直间距（编辑器 – >引脚 – >水平/垂直）。

在纵向布局中排列A和B，选择这两个元素，并添加这两个约束。 在头文件中为这两个约束创建IBOutlets（就像你对标签，按钮等一样）

然后，您可以在“didRotateFromInterfaceOrientation”委托方法（constraint_variable_name.constant = 0;）中更改这些约束的值。 如果有任何不清楚之处，请告诉我，或者您需要我详细说明其中的任何部分。