how to remove subviews from scrollview?

Question

how do i remove all subviews from my scrollview...

i have a uiview and a button above it in the scrollview something like this....

here is my code to add subview in scroll view

-(void)AddOneButton:(NSInteger)myButtonTag {
lastButtonNumber = lastButtonNumber + 1;

if ((lastButtonNumber == 1) || ((lastButtonNumber%2) == 1)) {
btnLeft = 8;}
else if ((lastButtonNumber == 2) || ((lastButtonNumber%2) == 0)) {
btnLeft = 162;
}
CGRect frame1 = CGRectMake(btnLeft, btnTop, 150, 150);
CGRect frame2 = CGRectMake(btnLeft, btnTop, 150, 150);
UIButton *Button = [UIButton buttonWithType:UIButtonTypeCustom];
Button.frame = frame1;
Button.tag = myButtonTag;
[Button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[Button setBackgroundColor:[UIColor clearColor]];
[Button setBackgroundImage:[UIImage imageNamed:@"WaitScreen.png"] forState:UIControlStateHighlighted];

    GraphThumbViewControllerobj = [[GraphThumbViewController alloc] initWithPageNumber:[[GraphIdArray objectAtIndex:myButtonTag]intValue]];
    GraphThumbViewControllerobj.view.frame=frame2;
    GraphThumbViewControllerobj.lblCounter.text=[NSString stringWithFormat:@"%d of %d",myButtonTag+1,flashCardsId.count];
    GraphThumbViewControllerobj.lblQuestion.text=[flashCardText objectAtIndex:myButtonTag];
    [myScrollView addSubview:GraphThumbViewControllerobj.view];


[myScrollView addSubview:Button];


if ((lastButtonNumber == 2) || ((lastButtonNumber%2) == 0)) {
btnTop = btnTop + 162;
}
if (btnTop+150 > myScrollView.frame.size.height) {
myScrollView.contentSize = CGSizeMake((myScrollView.frame.size.width), (btnTop+160));}
}

and here is the code to remove subviews

if(myScrollView!=nil)
{
        while ([myScrollView.subviews count] > 0) {
            //NSLog(@"subviews Count=%d",[[myScrollView subviews]count]);
            [[[myScrollView subviews] objectAtIndex:0] removeFromSuperview];
}

Solution 1

To remove all the subviews from any view, you can iterate over the subviews and send each a removeFromSuperview call:

// With some valid UIView *view:
for(UIView *subview in [view subviews]) {
    [subview removeFromSuperview];
}

This is entirely unconditional, though, and will get rid of all subviews in the given view. If you want something more fine-grained, you could take any of several different approaches:

• Maintain your own arrays of views of different types so you can send them removeFromSuperview messages later in the same manner
• Retain all your views where you create them and hold on to pointers to those views, so you can send them removeFromSuperview individually as necessary
• Add an if statement to the above loop, checking for class equality. For example, to only remove all the UIButtons (or custom subclasses of UIButton) that exist in a view, you could use something like:

// Again, valid UIView *view:
for(UIView *subview in [view subviews]) {
    if([subview isKindOfClass:[UIButton class]]) {
        [subview removeFromSuperview];
    } else {
        // Do nothing - not a UIButton or subclass instance
    }
}

Solution 2

An old question; but as it's the first hit on Google for this I thought I'd also make a note that there's also this method:

[[myScrollView subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)];

You can't do the isKindOfClass check with this, but it's still a good solution to know about.

Edit: Another point to note is that the scrollbar of a scrollview is added as a subview to that scrollview. Thus if you iterate through all the subviews of a scrollview you will come across it. If removed it'll add itself again - but it's important to know this if you're only expecting your own UIView subclasses to be in there.

Amendment for Swift 3:

myScrollView.subviews.forEach { $0.removeFromSuperview() }

Solution 3

To add to what Tim said, I noticed that you are tagging your views. If you wanted to remove a view with a certain tag you could use:

[[myScrollView viewWithTag:myButtonTag] removeFromSuperview];

Solution 4

I don't think you should use the fast enumeration suggestion.

for(UIView *subview in [view subviews]) {
   [subview removeFromSuperview];
}

Isn't this supposed to throw an exception if you change the collection being iterated? http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocFastEnumeration.html#//apple_ref/doc/uid/TP30001163-CH18-SW3

This example may be better.

NSArray *subviews = [[scroller subviews] copy];
for (UIView *subview in subviews) {
    [subview removeFromSuperview];
}
[subviews release];

Solution 5

The problem with the UIScrollView and others subclass of UIView is that they contains initially some views (like the vertical and horizontal scrollbar for the UIScrollView). So i created a category of UIView to delete the Subviews filtered on the class.

For example:

[UIScrollView removeAllSubviewsOfClass:[FooView class],[BarView class],nil];

The code:

- (void)removeAllSubviewsOfClass:(Class)firstClass, ... NS_REQUIRES_NIL_TERMINATION;


- (void)removeAllSubviewsOfClass:(Class)firstClass, ...
{
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"FALSEPREDICATE"];

    va_list args;
    va_start(args, firstClass);

    for (Class class = firstClass; class != nil; class = va_arg(args, Class)) 
    {
        predicate = [NSCompoundPredicate orPredicateWithSubpredicates:[NSArray arrayWithObjects:predicate,[NSPredicate predicateWithFormat:@"self isKindOfClass:%@",class], nil]];
    }

    va_end(args);
    [[self.subviews filteredArrayUsingPredicate:predicate] makeObjectsPerformSelector:@selector(removeFromSuperview)];

}

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