从其他UIViewController更改UIViewController的背景颜色

Question

I have allocated a UIviewController ontop of another one. I would like to change the color of the other one from this new controller, but I don't know how. I tried this:

-(IBAction)sliderValueChanged:(UISlider *)sender
{
NSLog(@"slider value = %f", sender.value);

ViewController1.view.backgroundColor = [UIColor colorWithRed:(160/sender.value) green:(97/sender.value) blue:(5/sender.value) alpha:0.6];
}

and imported the ViewController1 , but it gives an error. If I put self.view it will work fine but not on ViewController1 . How can I do this?

Answer 1

It doesn't look like you are actually storing a reference to the UIViewController you want to change the background color of. Try creating a property for the view controller that you are displaying and then do something like this:

@implementation MyPoppingController

-(void)showViewController
{
    UIStoryboard* sb = [UIStoryboard storyboardWithName:@"StoryboardInfo" bundle:nil];        
    self.myPopController = [sb instantiateInitialViewController]; 
    self.myPopController.myPresentingViewController = self;
    [self presentPopupViewController:self.myPopController animationType:MJPopupViewAnimationFade]; 
}
@end


@interface MyPoppedController

@property(strong, nonatomic) MyPopppingController *myPresentingViewController;

@end

@implementation MyPoppedController

-(IBAction)sliderValueChanged:(UISlider *)sender
{
    self.myPresentingViewController.view.backgroundColor = [UIColor colorWithRed:(160/sender.value) green:(97/sender.value) blue:(5/sender.value) alpha:0.6];
}

@end