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我是 iPhone 编程的新手。使用下面的代码，我在缩略图中显示图像。在那里我们可以选择多个图像，也可以选择和取消选择图像。选择一些图像后，它会在下一个视图中显示所选图像。为此，我使用了另一种方法。但问题是它在缩略图中显示图像但如果我选择任何图像意味着它显示了一些异常。任何机构都可以告诉我如何解决这个问题吗？

- (void)viewDidLoad
{   
    self.title=@"All Images";
        mImageSelected=[[NSMutableArray alloc]init];
    self.view.backgroundColor=[UIColor whiteColor];
    mFirst=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"one.jpg"]];
    mFirst.frame=CGRectMake(10, 10, 60, 50);

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] 
                                         initWithTarget:self 
                                         action:@selector(actionHandleTapOnImageView:)];
    mFirst.userInteractionEnabled = YES;
    [mFirst addGestureRecognizer:singleTap];
    [self.view addSubview:mFirst];
    msSec=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"two.jpg"]];
    msSec.frame=CGRectMake(80, 10, 60, 50);
    UITapGestureRecognizer *secsingleTap = [[UITapGestureRecognizer alloc] 
                                         initWithTarget:self 
                                            action:@selector(actionHandleTapOnImageView:)];
    msSec.userInteractionEnabled = YES;
    [msSec addGestureRecognizer:secsingleTap];

    [self.view addSubview:msSec];
    mThird=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"three.jpg"]];
    mThird.frame=CGRectMake(150, 10, 60, 50);
    UITapGestureRecognizer *trdsingleTap = [[UITapGestureRecognizer alloc] 
                                            initWithTarget:self 
                                            action:@selector(actionHandleTapOnImageView:)];
    mThird.userInteractionEnabled = YES;
    [mThird addGestureRecognizer:trdsingleTap];

    [self.view addSubview:mThird];
    m4th=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"four.jpg"]];
    m4th.frame=CGRectMake(220, 10, 60, 50);
    UITapGestureRecognizer *frthsingleTap = [[UITapGestureRecognizer alloc] 
                                            initWithTarget:self 
                                             action:@selector(actionHandleTapOnImageView:)];

    m4th.userInteractionEnabled = YES;
    [m4th addGestureRecognizer:frthsingleTap];
    [self.view addSubview:m4th];
    m5th=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"five.jpg"]];
    m5th.frame=CGRectMake(10, 70, 60, 50);
    UITapGestureRecognizer *fifthsingleTap = [[UITapGestureRecognizer alloc] 
                                             initWithTarget:self 
                                              action:@selector(actionHandleTapOnImageView:)];

    m5th.userInteractionEnabled = YES;
    [m5th addGestureRecognizer:fifthsingleTap];
    [self.view addSubview:m5th];
    UIButton *theSshowButton=[[UIButton alloc]init];
    theSshowButton.frame=CGRectMake(100, 300, 100, 30);
    theSshowButton.layer.borderWidth=2;
    theSshowButton.layer.borderColor=[UIColor purpleColor].CGColor;
    theSshowButton.layer.cornerRadius=5;
    theSshowButton.backgroundColor=[UIColor greenColor];
    [theSshowButton setTitle:@"Show" forState:UIControlStateNormal];
    [theSshowButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [theSshowButton addTarget:self action:@selector(show) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:theSshowButton];

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
-(void)actionHandleTapOnImageView:(UITapGestureRecognizer *) in_ImageSenderTap
{ 
if (in_ImageSenderTap.view.tag ==0 )
  {


     mTick=[[UIImageView alloc]initWithImage:[UIImage imageNamed: @"mark.jpg"]];
     mTick.frame=CGRectMake(0, 0, in_ImageSenderTap.view.frame.size.width*0.3,  in_ImageSenderTap.view.frame.size.height*0.4);

      [mImageSelected addObject:[in_ImageSenderTap.view accessibilityIdentifier]];

        [in_ImageSenderTap.view addSubview:mTick];


      in_ImageSenderTap.view.tag=1;
    }
       else
    {
    for (UIView *subviews in in_ImageSenderTap.view.subviews)
        {


            UIImageView *theSubview=(UIImageView*)subviews;

            [theSubview removeFromSuperview];
            [mImageSelected removeObjectIdenticalTo:[in_ImageSenderTap.view accessibilityIdentifier]];

        }
        in_ImageSenderTap.view.tag=0;
    }


}

像这样它表现出一些期望。

2013-03-01 12:01:21.332 ImageStuf[588:11303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(0x159a012 0x12a7e7e 0x154db6a 0x154da20 0x37e0 0x4b685a 0x4b599b 0x4b70df 0x4b9d2d 0x4b9cac 0x4b1a28 0x21e972 0x21ee53 0x1fcd4a 0x1ee698 0x25fcdf9 0x25fcad0 0x150fbf5 0x150f962 0x1540bb6 0x153ff44 0x153fe1b 0x25fb7e3 0x25fb668 0x1ebffc 0x1cd2 0x1c05 0x1)
libc++abi.dylib: terminate called throwing an exception
(lldb)

如果我在此方法中在代码下方评论 -(void)actionHandleTapOnImageView:(UITapGestureRecognizer *) in_ImageSenderTap意味着它工作正常，但它没有将图像存储在数组中。任何人都可以告诉我如何解决这个问题，谢谢 Aslam

[mImageSelected addObject:[in_ImageSenderTap.view accessibilityIdentifier]];
4

3 回答 3

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您尝试将 nil 插入 NSArray，因此引发了异常。您应该检查要插入的元素。

我认为您可以使用ALAssetLibrary来选择多个图像：

[_assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
    if (group) {
        [self.groupArray addObject:group];
    }
} failureBlock:^(NSError *error) {
    NSLog(@"Group not found!\n");
}];

- (void)getImages
{
    if (!self.assetsArray) {
        _assetsArray = [[NSMutableArray alloc] init];
    }

    if (!self.assetsLibrary) {
        _assetsLibrary = [[ALAssetsLibrary alloc] init];
    }

    @autoreleasepool {
        [self.assetsGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
            if (result) {
                TTAsset *ttAsset = [[TTAsset alloc] initWithAsset:result];
                [self.assetsArray addObject:ttAsset];
                [ttAsset release], ttAsset = nil;
            }
        }];
    }

    [self.tableView reloadData];
}

之后，您可以使用 ALAsset 的 thumbnail 属性。

ELCImagePickerController是一个很好的起点。

于 2013-03-01T13:13:55.370 回答
0

对于多项选择，您可以使用PSTCollectionView。这样一个很棒的库，这将在 iOS 5 中作为 gridView 工作，在 iOS6 之上它作为 UICollectionView 工作。

一切顺利！！！

于 2013-03-01T12:13:38.280 回答
0

首先accessibilityIdentifier，当您可以添加缩略图本身时，为什么还要麻烦插入数组呢？这将确保您不添加nil，这是导致崩溃的原因。您没有设置accessibilityIdentifier缩略图。

其次，为什么要创建 5 个实例UITapGestureRecognizer？只需在您使用相同的实例时addGestureRecognizer:，就不需要它的 5 个版本。

于 2013-03-01T13:04:44.490 回答