ios - Storyboard - 弹出框的委托(delegate)

Question

我正在使用弹出框，弹出框内部包含一个 uitableview，我想在点击 uitableview 时获得值(value)，我在里面创建委托(delegate)

弹出框.h

@class PopOverVCDelegate;
@protocol PopOverVCDelegate <NSObject>

-(void)getValue:(int)value;

@end

@interface ..
{
@property(nonatomic)id<PopOverVCDelegate> delegate;
}
@end

弹出框.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.delegate getValue:[indexPath row]];
}

和 mainclass 接收委托(delegate)是

主类.h

#import "PopOverVC.h"
@interface MainClassVC : UIViewController<PopupCatchupVCDelegate,UIPopoverControllerDelegate>
{}

主类.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showPopover"])
    {
        [[segue destinationViewController] setDelegate:self];
        UIPopoverController *p = [(UIStoryboardPopoverSegue *)segue popoverController];
        p.popoverBackgroundViewClass = [CustomPopoverBackground class];
        self.popoverController = p;        
        popoverController.delegate = self;
    }
}

-(void)getValue:(int)value
{
    NSLog(@"adsf-%d",value);
}

我没有从代表那里得到任何值(value)。任何人都可以帮助我，我使用 Storyboard 并从推送导航中调用弹出框。

Answer 1

在 popover.h 你声明了协议(protocol) PopOverVCDelegate & 在 mainclass.h 你正在实现 PopupCatchupVCDelegate 协议(protocol)。您的主类应该向 PopOverVCDelegate 确认。

@interface MainClassVC : UIViewController<PopOverVCDelegate, PopupCatchupVCDelegate, UIPopoverControllerDelegate>

此外，您应该在调用它之前检查委托(delegate)方法是否已实现 -

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if([self.delegate respondsToSelector:@selector(getValue:)])
        [self.delegate getValue:[indexPath row]];
}

编辑

我查看了 Storyboard并注意到，您的委托(delegate)没有设置为正确的 Controller 。您正在将委托(delegate)设置为 p(UIPopoverController)，您应该将其设置为 popover 的 contentViewController(PopOver)。

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"idenPopover"])
    {
        [[segue destinationViewController] setDelegate:self];
        UIPopoverController *p = [(UIStoryboardPopoverSegue *)segue popoverController];
        p.popoverBackgroundViewClass = [CustomPopoverBackground class];
        self.popoverController = p;
        self.popoverController.delegate = self;

        //set delegate to PopOver 
        UINavigationController *navigationController = (UINavigationController*)p.contentViewController;
        PopOver *popOver = (PopOver*)navigationController.topViewController;
        [popOver setDelegate:self];
    }
}