委托方法不执行

Question

我真的很难找出为什么我的一个委托方法执行完美，但另一个不会。下面是委托相关的代码不工作：

SideBarController.h

#import <UIKit/UIKit.h> 
#import "Report.h" 

@protocol ReportSelectViewControllerDelegate <NSObject> 
@optional 
    - (void) viewSelectMonitoredArea:(Report *)report; 

@end 

@interface SidebarController : UIViewController <UITableViewDataSource, UITableViewDelegate> 

@property (nonatomic, weak) id <ReportSelectViewControllerDelegate> delegate; 
@property (nonatomic, weak) IBOutlet UITableView *tableView; 
@property (nonatomic, weak) Report *selectedReport; 

@end 

SideBarController.m

#import "SidebarController.h" 

@interface SidebarController() 

@end 

@implementation SidebarController 

@synthesize tableView = _tableView; 
@synthesize delegate; 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

    NSMutableArray *sectionArray = [self.tableViewItems objectAtIndex:indexPath.section]; 
    NSDictionary* item = sectionArray[indexPath.row]; 

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults setObject:item[@"title"] forKey:@"CurrentReportTitle"]; 

    self.selectedReport = [Report where:@{@"reportTitle": item[@"title"]}].lastObject; 

    [self.delegate viewSelectMonitoredArea:self.selectedReport]; 

    [tableView deselectRowAtIndexPath:indexPath animated:YES]; 

} 

DetailReportViewController.h

#import <UIKit/UIKit.h> 
#import "BDBSplitViewController.h" 
#import "SidebarController.h" 

@interface DetailReportViewController : BDBDetailViewController <UISplitViewControllerDelegate, ReportSelectViewControllerDelegate > 

@end 

DetailReportViewController.m

#import "DetailReportViewController.h" 

@interface DetailReportViewController() 

@end 

@implementation DetailReportViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    SidebarController *sideBarController = [[SidebarController alloc] init]; 
    sideBarController.delegate = self; 
} 

- (void) viewSelectMonitoredArea:(Report *)report { 

    NSLog(@"viewSelectMonitoredArea was called"); 
} 

从另一个控制器到DetailReportViewController书面方式完全相同另一位代表作品就好。当我在调用委托之后立即放置断点时，我注意到委托没有值。任何帮助将不胜感激。 编辑： 对不起，我忘了把sideBarController.delegate = self放在DetailReportViewController.h的例子中。它在原始代码中。

Answer 1

DetailReportViewController类需要获取对“SideBarController”实例的引用，然后将其自身设置为委托。在DetailReportViewController：

// This needs to be in the DetailReportViewController class 
// Assume we have a reference to the SideBarController in the DetailReportViewController class called sideBarControllerInstance 
sideBarControllerInstance.delegate = self; 

Answer 2

迈克尔Dautermann刺激下的解决方案是把

DetailReportViewController *detailReport = [[DetailReportViewController alloc] init]; 
    self.delegate = detailReport; 

前右

[self.delegate createSelectMonitoredArea:self.selectedReport]; 

谢谢！