我没有尝试动画从代码中设置在IB中的视图.应用崩溃的原因如下：

The view hierarchy is not prepared for the constraint…

我在这里看到了一些类似的问题,原因始终是以编程方式创建的视图尚未添加到superview中.但我在IB中创建了所有观点！

控制台还说：

View not found in container hierarchy: (here goes it’s superview)

它对我没有任何意义,因为事实上它是适当的superview的子视图,xcode知道它 – 它立即打印视图层次结构,它适合.

可能是什么原因？
谢谢！

编辑：我使用的代码：

- (void)setEditingConstraintsForView:(UIView *)view
{
    // Pin given view to top,fix it height
    NSDictionary *givenView = @{@"view":view};
    view.translatesAutoresizingMaskIntoConstraints = NO;

    NSArray *horizontalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[view]|" options:0 metrics:nil views:givenView];
    NSArray *verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[view(height)]" options:0 metrics:@{@"height":@(viewHeight)} views:givenView];

    [self.animatedVIew addSubview:view];

    for (NSArray *constraints in @[horizontalConstraints,verticalConstraints]) {
        [view addConstraints:constraints];
    }
}

我还删除了在安装new之前在IB中设置的所有约束：

- (NSDictionary *)constraintsFromIB
{
    if (!_constraintsFromIB) {
        _constraintsFromIB = @{@"view1":self.view1.referencingConstraintsInSuperviews,@"view2":self.view2.referencingConstraintsInSuperviews,@"view3":self.view3.referencingConstraintsInSuperviews };
    }

    return _constraintsFromIB;
}

然后：

- (void)updateViewConstraints
{
    [super updateViewConstraints];

    // clear all constraints
    for (NSString *viewName in self.constraintsFromIB.allKeys) {
        for (NSLayoutConstraint *constraint in self.constraintsFromIB[viewName]) {
            [constraint remove];
           }

}
}

更新2：方法我使用调用更改：当用户触摸视图时,调用此视图：

- (void)animateConstraintsForState:(LDYEditingLabel)state
{
    self.editingLabel = state;        
    [UIView animateWithDuration:0.3 animations:^{
        [self updateViewConstraints];
        [self.view layoutIfNeeded];
    }];
}

稍后在updateViewConstraints中：有一个代码触发我的方法setEditingConstraintsForView：(UIView *)视图