Check programmatically created UIView visible or not

Question

vwInfo = [[UIView alloc]initWithFrame:CGRectMake(20, 85, 280, 100)];
[self.view addSubview:vwInfo];

I create a UIView programmatically on button tap.when i click it again i need to check vwInfo is visible or not.I can done this with a Boolean value.is there any other option to do this?

Answer 1

you can check if view is exist or not using isDescendantOfView but make sure you have to pass your vwInfo 's superview to check view already exist or not.

if ([vwInfo isDescendantOfView:self.view]) {
    //view already exist in self.view
}
else{
   //view is not exist in self.view.
}

Answer 2

Is it because you do not want to add the UIView a second time when you already added it ? In this case you could declare in your .h(header) file UIView *vwInfo; and then in your IBAction for your UIButton :

if(vwInfo == nil) {
   vwInfo = [[UIView alloc]initWithFrame:CGRectMake(20, 85, 280, 100)];
   [self.view addSubview:vwInfo];
}

Answer 3

you can check with Tag Functionality . Assign tag to your view .

UIView * vwInfo = [[UIView alloc]initWithFrame:CGRectMake(20, 85, 280, 100)];
[vwInfo setTag:101];
[self.view addSubview:vwInfo];

On Button Click

- (void)buttonClick :(id)sender {

    UIView * viewTemp = (UIView *)[self.view viewWithTag:101];

    if(viewTemp){
        NSLog(@"View is available");
        if([viewTemp isHidden]){
            NSLog(@"Your view is hidden");
        }else{
            NSLog(@"Your view is visible");
        }
    }else{
        NSLog(@"View is not added yet");
    }
}

Answer 4

UIView is accessible with the superview property

if([vwInfo superview]!=nil)

NSLog(@"visible");

else

NSLog(@"not visible");