iOS UIView adding and removing subviews throughout the code

Question

I have a blue line in my app that displays an artificial horizon. I want to be able to display and remove it at different parts of the code (.m). Can I declare it (lineViewHorizon) universally.

At present I can make it appear/disappear only within the same section/method of code.

I presume this can be done?

UIView *lineViewHorizon = [[UIView alloc] initWithFrame:CGRectMake(0, pageTopMargin+inthorizon, self.view.bounds.size.width, 2)];
lineViewHorizon.backgroundColor = [UIColor blueColor];
[self.view addSubview:lineViewHorizon];
[lineViewHorizon removeFromSuperview];

Caleb · Accepted Answer · 2014-10-04 14:54:08Z

1

I want to be able to display and remove it at different parts of the code

In order to remove a view from another view, you'll need a pointer to the view that you want to remove. You can get that either by finding the view in the view hierarchy, perhaps using -viewWithTag:, or you can keep a pointer to the view in an instance variable (or property). Either way, the key thing is that you need a pointer to the view so that you can send it a -removeFromSuperview message.

answered Oct 4, 2014 at 14:54

Caleb

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2 Comments

Edward Hasted Over a year ago

I was trying the second approach but am grappling with the syntax. I have put a -(void) Property in my .h but not sure how to declare the pointer in the .m.

Edward Hasted Over a year ago

Can I declare this as UIView *lineViewHorizon; after the @implementation? That works but is it good practice?

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