如何从另一个uiviewcontroller控制出口

Question

已经连续三天试图解决这个问题，但仍然一无所获。因此，我想使用从rect按钮（按下按钮）出现的popview中的滑块来控制uiview的alpha我已经做了什么，

mainview.h文件：

@class popView;
@interface brightscreenViewController : UIViewController <UIPopoverControllerDelegate>
{    
    IBOutlet UIView *darkView;
    IBOutlet UIButton *brightbtn;
    UIPopoverController *popvover;
    popView *pop;   
}
@property(nonatomic, retain) UIPopoverController *popover;
@property (nonatomic, retain) UIView *darkView;
@property (nonatomic, retain) popView *pop;
- (IBAction)showPop:(id)sender; 

mainview.m文件：

#import "brightscreenViewController.h"
#import "popView.h"
@class popView;
@interface brightscreenViewController ()
@end
@implementation brightscreenViewController
@synthesize popover;
@synthesize darkView;
@synthesize pop;
-(IBAction)showPop:(id)sender
{    
    popView *brightpop = [[popView alloc] init];
    popover = [[UIPopoverController alloc] initWithContentViewController:brightpop];
    [popover setDelegate:self];
    [popover presentPopoverFromRect:[brightbtn bounds] inView:brightbtn permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
    [popover setPopoverContentSize:CGSizeMake(229, 57)];
}

第二个视图.h包含uipopview和滑块：

@class brightscreenViewController;
@interface popView : UIViewController
{
    brightscreenViewController *brightscreen;
    IBOutlet UISlider *slider;   
}
@property (nonatomic, retain)UISlider *slider;
@property (nonatomic, retain) brightscreenViewController *brightscreen;
-(IBAction)setBrightness:(id)sender;

secondview.m文件：

#import "popView.h"
#import "brightscreenViewController.h"

@interface popView ()
@end
@implementation popView
@synthesize slider;
@synthesize brightscreen;
-(IBAction)setBrightness:(id)sender
{   
    brightscreen.darkView.alpha = slider.value;
}

弹出操作很好，但滑块不行。它根本没有反应。我已经尝试使用相同的代码将滑块直接放在主视图上，它运行得很好，但当我使用uipopover时就不起作用了我真的希望有人能帮我。

Answer 1

怎么样：

popView *brightpop = [[popView alloc] init];
// New line
brightpop.brightscreen = self;
popover = [[UIPopoverController alloc] initWithContentViewController:brightpop];