多个图像不在iPhone中选择

Question

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，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上显示图像，但如果我选择任何图像意味着它显示一些例外。任何机构能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; 
    } 


} 

像这样它显示了一些预期。

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) 

如果我在这个方法 -(void)actionHandleTapOnImageView:(UITapGestureRecognizer *) in_ImageSenderTap意味着其工作正常，但其在array.Can不存储图像下面的代码注释任何机构告诉我如何解决售后服务这个 感谢 阿斯拉姆

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

Answer 1

对于您可以使用多种选择PSTCollectionView。这样一个伟大的库，并且这将在iOS 5中作为gridView工作，并且在iOS6上面作为UICollectionView工作。

所有最好的！

Answer 2

首先，为什么还要在数组中插入accessibilityIdentifier，何时可以添加缩略图呢？ 这将确保您不会添加nil，这是产生崩溃的原因。您没有在缩略图上设置accessibilityIdentifier。

二，为什么要创建5个实例UITapGestureRecognizer？当您使用addGestureRecognizer:时，只需使用相同的实例，不需要它的5个版本。

Answer 3

您试图将nil插入到NSArray中，所以它引发了一个异常。您应该检查要插入的元素。

我认为你可以使用ALAssetLibrary选择多个图片：

[_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的缩略图财产。

ELCImagePickerController是一个很好的起点。