Remove all the subviews from a UIScrollView?

Question

How do I remove all of the subviews from a UIScrollview?

__Swift__ version is [here](http://stackoverflow.com/a/27065076/607368) — Dan Peters, Feb 11 '15 at 03:54

score 126 · Accepted Answer · edited May 23 '17 at 12:10

126

Let scrollView be an instance of UIScrollView.

In Objective-C, it's pretty easy. Just call makeObjectsPerformSelector:, like so:

Objective-C:

[scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

In Swift, you don't get that runtime access, so you have to actually handle the iteration yourself.

Swift:

A concise version, from here:

scrollview.subviews.map { $0.removeFromSuperview() }

A more descriptive way to do this (from here) assumes scrollview.subviews:

let subviews = self.scrollView.subviews
for subview in subviews{
    subview.removeFromSuperview()
}

edited May 23 '17 at 12:10

Community

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answered Nov 04 '10 at 23:47

koo

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3

This will remove the scroll indicators if they are set to display, but the OP isn't concerned with the them as noted in the comments below. – Jessedc Jan 21 '13 at 00:51
1

I think you should make a copy of the subviews array before calling this method, since you aren't supposed to call the makeObjectsPerformSelector: with a method which mutates the original array. This will. – sammyd Mar 13 '14 at 09:42
2

you should use forEach instead of map, since map returns an array. – PruitIgoe Jun 28 '18 at 18:56

score 35 · Answer 2 · answered Nov 05 '10 at 08:11

35

I think you just have to be careful and not to delete the scroll indicator bars.

The code given by Adam Ko is short and elegant but it may delete the horizontal and vertical scroll indicators.

I usually do

for (UIView *v in scrollView.subviews) {
  if (![v isKindOfClass:[UIImageView class]]) {
    [v removeFromSuperview];
  }
}

Suposing you don't have UIImageView's added to the scroll manually.

answered Nov 05 '10 at 08:11

Ricardo de Cillo

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For what I've tested, my code did not remove the scroll indicators, I believe that's because UIScrollView loads indicators lazily whenever it needs to be displayed, but that's a good point to be noted though. – koo Nov 06 '10 at 10:12
5

Actually I think this is not a good solution because what if you have UIImageView subviews that you want to remove? – Tony Jan 13 '12 at 00:27

score 2 · Answer 3 · answered Jun 01 '14 at 09:19

In addition to Ricardo de Cillo's, in my case I had a table view that had imageviews in the subviews that I wanted to remove.

for (UIView *v in self.tableview.subviews) {
  if ([v isKindOfClass:[UIImageView class]]) {
    [v removeFromSuperview];
  }
}

The removal of the ! in the if command, and change scrollview to self.tableview removed all images, but left the table view untouched.

score 1 · Answer 4 · answered Jul 24 '13 at 01:57

1

If you want to remove uiimageviews in scrollview.subviews, and you also want to keep the vertical and horizontal indicators. You can set a special "tag" to identify views and exclude vertical and horizontal indicators whose tags are 0 by default.

answered Jul 24 '13 at 01:57

Chiakie

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score 0 · Answer 5 · answered Sep 13 '16 at 05:58

0

Complementing the Swift concise version from a previous answer (Swift 3.0 ready):

_ = scrollView.subviews.filter { $0 is UIImageView }.map { $0.removeFromSuperview() }

answered Sep 13 '16 at 05:58

Gui Moura

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Remove all the subviews from a UIScrollView?

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