问题
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.
回答1:
There are two options 1) hide 2) removeFromSuperview.
If You install or uninstall view from storyboard, It is equivalent to add/remove view.
refer this apple documentation it says,
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.
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)")
try it with installed and uninstalled. hope this will help :)
来源：https://stackoverflow.com/questions/36712036/how-to-activate-installed-programmatically