将NSMutableArray从模态视图控制器传递到父视图 [英] Passing NSMutableArray from Modal View Controller to Parent View

问题描述

我正在努力将NSMutable数组从Modal View控制器传递回我来自的视图控制器.

I'm struggling to pass a NSMutable array from a Modal View controller back to the view controller I came from.

这是我当前的方法:

FirstViewController.h
#import "SecondViewController.h"

@property (strong, nonatomic) IBOutlet NSMutableArray *passedRecipientsArray;


FirstViewController.m
@synthesize passedRecipientsArray = _passedRecipientsArray;

- (void)viewDidAppear:(BOOL)animated {
    NSLog(@"passedRecipientsArray: %@", self.passedRecipientsArray);
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([[segue identifier] isEqualToString:@"addContact"]){
        UINavigationController *nav = [segue destinationViewController];
        SecondViewController *secondViewController = (SecondViewController *)nav.topViewController;
        secondViewController.emailContact = @"TRUE";
    }
}

---

SecondViewController.h
@property (strong, nonatomic) IBOutlet NSMutableArray *selectedContactsArray;


SecondViewController.m
@synthesize passedRecipientsArray = _passedRecipientsArray;

- (void)closeWindow
{
    if([self.selectedContactsArray count] != 0){
        NSLog(@"PASS ME: %@", self.selectedContactsArray);

        FirstViewController *firstViewController = [[FirstViewController alloc] init];

        if(firstViewController.passedRecipientsArray == nil) firstViewController.passedRecipientsArray = [[NSMutableArray alloc] init];
        firstViewController.passedRecipientsArray = self.selectedContactsArray;

        [self dismissModalViewControllerAnimated:YES];
    }
}

是否有更好的方法?我尝试使用过此方法:如何在模式视图的关闭时传递对象，但非常困惑.

Is there a better way of doing this? I've tried to used this: How to pass object on modal view's dismissal but get very confused.

有人对我要做什么有很好的教程/简单明了的方法吗? 谁能告诉我我要去哪里错了?

Does anyone have a good tutorial/clear easy way of doing what I'm after? Can anyone tell me where I'm going wrong?

推荐答案

首先，不要在secondViewController中创建并分配firstViewController的另一个实例..instead..在secondViewController中创建属性FirstViewController *firstViewController，再在secondViewController .m文件中对其进行合成...

Firstly do not create and allocate another instance of firstViewController in secondViewController..instead..create a property FirstViewController *firstViewController in secondViewController further synthesize it in secondViewController .m file...

按照更正后的代码

FirstViewController.h
#import "SecondViewController.h"

@property (strong, nonatomic) IBOutlet NSMutableArray *passedRecipientsArray;


FirstViewController.m
@synthesize passedRecipientsArray = _passedRecipientsArray;

- (void)viewDidAppear:(BOOL)animated {
    NSLog(@"passedRecipientsArray: %@", self.passedRecipientsArray);
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([[segue identifier] isEqualToString:@"addContact"]){
        UINavigationController *nav = [segue destinationViewController];
        SecondViewController *secondViewController = (SecondViewController *)nav.topViewController;
        secondViewController.firstViewController = self;  // u should create firstViewController first in secondViewController class making it a property

        secondViewController.emailContact = @"TRUE";
    }
}

然后在secondViewController中

then in secondViewController

     SecondViewController.h
@interface FirstViewController : UIViewController{
FirstViewController *firstViewController;
}
        @property (strong, nonatomic) IBOutlet NSMutableArray *selectedContactsArray;
        @property(nonatomic,strong) FirstViewController *firstViewController;

    SecondViewController.m

     @synthesize passedRecipientsArray = _passedRecipientsArray;
        @synthesize firstViewController
     - (void)closeWindow
            {
                if([self.selectedContactsArray count] != 0){
                    NSLog(@"PASS ME: %@", self.selectedContactsArray);



                if(firstViewController.passedRecipientsArray == nil)  {

                firstViewController.passedRecipientsArray = [[NSMutableArray alloc] init];
                firstViewController.passedRecipientsArray = self.selectedContactsArray;

                [self dismissModalViewControllerAnimated:YES];
            }
        }
    }

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