我创建了三个视图控制器，即FirstViewController，SecondViewController＆amp; ThirdViewController。 FirstViewController推送SecondViewController，同样SecondViewController推ThirdViewController。
ThirdViewController是一个UITableViewController。
SecondViewController和ThirdViewController具有自定义协议。它们都使用各自的代表将一些值传递给FirstViewController。
问题是SecondViewController成功将值传递给FirstViewController，但ThirdViewController无法执行此操作。
是不是因为SecondViewController直接从FirstViewController导航，所以它可以传递它，而ThirdViewController与FirstViewController没有关联，所以它是FirstViewController无法传递数据？
任何帮助都将不胜感激。
编辑：
SecondViewController只是通过按钮操作推送SecondViewController.h。
@protocol secondViewDelegate <NSObject>
-(void)didCompleteSending:(NSArray *)array;
@end
@interface secondView : UIViewController
@property (nonatomic,strong) NSArray *footballPlayers;
@property (assign) id<secondViewDelegate>delegate;
- (IBAction)btnAction:(id)sender;
- (IBAction)btnGoToThirdView:(id)sender;
是：
SecondViewController.m - (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
footballPlayers = [[NSArray alloc]initWithObjects:@"Rooney",@"Van Persie",@"Ronaldo",@"Kagawa", nil];
}
- (IBAction)btnAction:(id)sender {
[delegate didCompleteSending:footballPlayers];
}
- (IBAction)btnGoToThirdView:(id)sender {
thirdView *objthirdView = [[thirdView alloc]init];
objthirdView.delegate=self;
[self.navigationController pushViewController:objthirdView animated:YES];
}
是：
ThirdViewController类似地，我有FirstViewController.h。
-(void)didCompleteSending:(NSArray *)array{
for (NSString *str in array) {
NSLog(@"%@",str);
}
}
- （void）didSendDetailsFromThirdView：（NSString *）colors {
NSLog（@“选择的字符串是=％@”，颜色）;
}
-(void)didSendDetailsFromThirdView:(NSString *)colors{'1}}不会从'ThirdViewController'调用。
第二次编辑
- (IBAction)btnGoToThirdView:(id)sender {
FirstViewController *objFirstViewController = [FirstViewController alloc]init];
thirdView *objthirdView = [[thirdView alloc]init];
objthirdView.delegate=objFirstViewController;
[self.navigationController pushViewController:objthirdView animated:YES];
}
答案 0 :(得分：0)
您正在设置ThirdViewController。{m}中的SecondViewController的委托给自己
objthirdView.delegate=self;
这意味着ThirdViewController的代表是SecondViewController而不是FirstViewController。在[{1}}中保留对FirstViewController的引用，并将其作为代理人使用。
SecondViewController假设无法从objthirdView.delegate=myFirstViewController;
弹出到ThirdViewController，您可能会滥用FirstViewController通过委托方法将数据传回SecondViewController实现。但我不推荐它 - 它不是一个好的设计。