iphone - 将 NSMutableArray 传递给另一个 View ，给出空值

Question

我是 iOS 开发的新手，我想将一个 NSMutableArray 从一个 View Controller 传递到另一个 View Controller ，但总是给我空值

FirstViewController.h

@interface FirstViewController : UIViewController

@property (nonatomic, retain) NSMutableArray *colorArray;
-(IBAction)btn:(id)sender;

FirstViewController.m

@implementation FirstViewController


-(IBAction)btn:(id)sender
{


  SecondViewController* secondViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

    secondViewController.animalArray = self.colorArray;

    NSLog(@"%@",secondViewController.animalArray); // here its not null

    [self.navigationController pushViewController:secondViewController animated:YES];

}

SecondViewController.h

@interface SecondViewController : UIViewController

@property (nonatomic, retain) NSMutableArray *animalArray;

SecondViewController.m

我只用了 NSLog(@"animalArray:%@",self.animalArray);在 viewDidLoad 中检查值但给了我 null

有什么我遗漏的吗？

编辑:

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"indidLoad%@",self.animalArray);


}

- (void)viewWillAppear:(BOOL)animated 
{
    [super viewWillAppear:animated];

    NSLog(@"inwillAppear%@",self.animalArray);


 }

Answer 1

用下面的方法替换

-(IBAction)btn:(id)sender{
      SecondViewController* secondViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
         secondViewController.animalArray=[[NSMutableArray alloc]initWithArray:self.colorArray];
        [self.navigationController pushViewController:secondViewController animated:YES];
    }

:) +1