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我有两个视图控制器:BSViewController其中包含源 ivarsnumberarray,以及BSotherViewController作为目标需要接收 ivars 。 这个问题提供了一种产生预期结果的方法。建议是使用 prepareForSegue 方法,我已经部分实现了该方法,但 ivars 并没有完全达到BSotherViewController.

BSViewController.m

#import "BSViewController.h"
#import "BSData.h"
@interface BSViewController ()
@end
@implementation BSViewController
@synthesize number;
@synthesize array;

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    NSLog(@"identifier=%@ destination=%@", segue.identifier, segue.destinationViewController);
    if ([segue.identifier isEqualToString:@"goToOtherVC"]) {
        BSData *data;
        data = [[BSData alloc] initWithNumber:self.number array:self.array];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSArray* _array = [NSArray arrayWithObjects: @"manny",@"moe",nil];
    self.array = _array;
    self.number = 25;
}
@end

我有一个名为 BSData 的模型类。

BSData.h

#import <Foundation/Foundation.h>
@interface BSData : NSObject
@property (nonatomic) NSInteger number;
@property (nonatomic, copy) NSArray * array;
- (id)initWithNumber:(NSInteger)number array:(NSArray *)array;
@end

BSData.m

#import "BSData.h"

@implementation BSData
- (id)initWithNumber:(NSInteger)number array:(NSArray *)array
{
    self = [super init];
    if (self) {
        _number = number;
        _array = array;

        NSLog(@"data number: %d", number);
        NSLog(@"data array: %@", array);
        return self;
    }
    return nil;
}
@end

由此产生的控制台读数如下,并向我表明该initWithNumber:array:部分prepareForSegue工作正常。

2013-03-14 03:06:28.023 tester[42514:11303] data number: 25
2013-03-14 03:06:28.023 tester[42514:11303] data array: (
    manny,
    moe
)

但目标BSotherViewController没有收到 ivars。

BSotherViewController.h

#import <UIKit/UIKit.h>
@class BSData;
@interface BSotherViewController : UIViewController <UINavigationControllerDelegate>
@property (nonatomic) NSInteger number;
@property (nonatomic, weak) NSArray * array;
@property (strong, nonatomic) BSData *data;
@end

BSotherViewController.m

#import "BSData.h"
#import "BSotherViewController.h"
@interface BSotherViewController ()
- (void)configureView;
@end

@implementation BSotherViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"other view: %@", self.data);
    NSLog(@"other number: %d", self.number);
    NSLog(@"other array: %@", self.array);
}
@end

由此产生的控制台读数如下,并向我表明情节提要“新参考插座”项目可能有问题,但我无法连接该项目,因为没有控制拖动“需要”。但这可能根本不是问题。

2013-03-14 03:51:54.423 tester[43130:11303] other view: (null)
2013-03-14 03:51:54.424 tester[43130:11303] other number: 0
2013-03-14 03:51:54.425 tester[43130:11303] other array: (null)
4

1 回答 1

1

在您中prepareForSegue:sender:,您创建一个 BSData 对象并且对它不做任何事情。

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    NSLog(@"identifier=%@ destination=%@", segue.identifier, segue.destinationViewController);
    if ([segue.identifier isEqualToString:@"goToOtherVC"]) {
        // local variable is declared
        BSData *data;
        // local variable is initialized with newly created BSData object
        data = [[BSData alloc] initWithNumber:self.number array:self.array];
        // now what?
    }
}

您应该从 segue 获取目标控制器并为其属性分配值。您链接的答案显示了如何执行此操作。

于 2013-03-14T08:27:50.930 回答