使用NSLayoutConstraints调整当前视图的大小 [英] Resize current view using NSLayoutConstraints

问题描述

我正在尝试使用NSLayoutConstraint s设置视图的布局.

I'm trying to set the layout of a view using NSLayoutConstraints.

我可以在视图中正确设置内容，但是如果约束需要，我还需要能够调整当前视图的大小(我正在为其设置约束的视图).换句话说，我想通过一个灵活的窗口来设置固定的内容大小，而不是相反.

I can set things up within the view correctly, but I also need to be able to resize the current view (the one that I'm setting the constraints for) if the constraints require it. In other words, I want to set a fixed content size with a flexible window, rather than the reverse.

所以基本上，我有:

NSDictionary *views = [NSDictionary dictionaryWithObjectsAndKeys:self.v1, @"v1",
                       self.v2, @"v2",
                       nil];
// Set horizontal constraints
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-[v1]-|"
                                                             options:0
                                                             metrics:nil
                                                               views:views]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-[v2]-|"
                                                             options:0
                                                             metrics:nil
                                                               views:views]];
// Set vertical constraints
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[v1]-[v2]-|"
                                                             options:0
                                                             metrics:nil
                                                               views:views]];
// Initialise height constraint for v1
self.v1Height = [NSLayoutConstraint constraintWithItem:self.v1
                                                attribute:NSLayoutAttributeHeight
                                                relatedBy:NSLayoutRelationEqual
                                                   toItem:nil
                                                attribute:NSLayoutAttributeNotAnAttribute
                                               multiplier:1
                                                 constant:50];

如果以后要更改self.v1Height(通过删除，重新创建然后读取)，我希望self的框架扩展(或收缩)以适应更改后的高度.

If I later change self.v1Height (by removing it, recreating it, and then readding it), I would like the frame of self to expand (or contract) to accommodate the changed height.

我不确定它是否相关(因为我比OS X对iOS更熟悉)，但这是NSPopover的内容视图.

I'm not sure if it's relevant (as I'm more familiar with iOS than OS X), but this is the content view of a NSPopover.

我需要添加哪些约束来实现这一目标?

What constraint do I need to add to achieve this?

推荐答案

事实证明，NSPopoverController是规则的例外，并且translatesAutoresizingMaskIntoConstraints必须为YES才能使自动布局正常工作.

As it turns out, NSPopoverController is an exception to the rule, and translatesAutoresizingMaskIntoConstraints must be YES for autolayout to work correctly.

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