如何激活“已安装”编程？ [英] How to activate "Installed" programmatically?

问题描述

这是 UIView ，我想激活它（带有约束等），当我想要时，该怎么做？我不想 removefromsuperview 等。只是想学习这个已安装的函数完全等同于代码。

This is an UIView and I want to activate it (with its constraints etc.), when I want, how to do that? I don't want removefromsuperview etc. Just want to learn this Installed function exact equivalent in terms of code.

推荐答案

那里有两种选择1）隐藏 2） removefromSuperview 。

There are two options 1) hide 2) removefromSuperview.

如果您安装或从 storyboard 中卸载视图，相当于添加/删除视图。

请参阅苹果文档它说，

仍然创建了卸载视图的运行时对象。但是，视图和任何相关约束不会添加到视图层次结构中，并且视图的superview属性为nil。这与隐藏不同。隐藏视图在视图层次结构中与任何相关约束一样。

A runtime object for an uninstalled view is still created. However, the view and any related constraints are not added to the view hierarchy and the view has a superview property of nil. This is different from being hidden. A hidden view is in the view hierarchy along as are any related constraints.

您可以通过两行代码检查这一点，

you can check this by two line of code,

 NSArray *arr = [self.view subviews];
 NSLog(@"arr is %@",arr);

swift：

let array: Array = self.view.subviews
print("Array is \(array)")

尝试安装和卸载。
希望这会有所帮助：）

try it with installed and uninstalled. hope this will help :)

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