How to remove view from superview in run time? - ios

Question

Based on internet connectivity I have to remove or add subview to superview.
I can able to add subview in runtime. But not remove from subview.
I tried like this
if ([statusString isEqualToString:#"Access Not Available"]){
view = [[UIView alloc]initWithFrame:CGRectMake(0, navigationView.frame.size.height, self.view.frame.size.width, 50)];
[self.view addSubview:view];
view.backgroundColor = [UIColor lightGrayColor];
}else{
[[NSOperationQueue mainQueue] addOperationWithBlock:^ {
[view removeFromSuperview];
}];
}
But it is not removing from superview.
How can I do this?

Answer 1

///in view did load
view_NoConnectn = [[UIView alloc]init];
[view_NoConnectn setBackgroundColor:[UIColor whiteColor]];
[view_NoConnectn setFrame:CGRectMake(0, frameHeight, frameWidth, 35)];
UIWindow* mainWindow = [[UIApplication sharedApplication] keyWindow];
bool isFound=false;
for(UIView *child in [mainWindow subviews])
{
if([child tag]==007)
isFound=true;
}
if(!isFound)
{
[mainWindow addSubview: btn_setting];
}
[self.navigationController.view addSubview:view_NoConnectn];
////// whereever required
if (show){
if (self.navigationController.view.frame.size.height == frameHeight) {
[UIView animateWithDuration:1.0 animations:^{
[self.navigationController.view setFrame:CGRectMake(self.navigationController.view.frame.origin.x, self.navigationController.view.frame.origin.y, self.navigationController.view.frame.size.width, frameHeight - 35)];
[view_NoConnectn setFrame:CGRectMake(0, frameHeight-35, frameWidth, 35)];
[self.view layoutIfNeeded];
}];
}
}
else
{
if (self.navigationController.view.frame.size.height != frameHeight) {
[UIView animateWithDuration:1.0 animations:^{
[UIView animateWithDuration:0.8 animations:^{
[self.navigationController.view setFrame:CGRectMake(self.navigationController.view.frame.origin.x, self.navigationController.view.frame.origin.y, self.navigationController.view.frame.size.width, frameHeight)];
[view_NoConnectn setFrame:CGRectMake(0, frameHeight, frameWidth, 35)];
[self.view layoutIfNeeded];
}];
} completion:^(BOOL finished) {
[view_NoConnectn removeFromSuperview];
}];
}
}