Question

我正在为iPhone制作应用程序，并希望让用户能够从他们的照片库中多选图像。我已经有一个工作代码供用户一次选择四个图像。但我不能一次选择2或3张图像。我想一次选择2或3张图片。

如果我选择了2张图片，我就会出现这样的异常：Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 3 beyond bounds [0 .. 2]

如果我选择3张图片，我会得到如下例外：Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]'

如果我点击一张图片，我会收到以下异常：Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'。我无法找到解决这个问题的方法。我应该如何修复我的代码以使其按预期工作？

到目前为止，这是我的代码：

- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info

{

[self dismissViewControllerAnimated:YES completion:nil];

for (UIView *v in [_scrollView subviews]) 

{

[v removeFromSuperview];

 }

CGRect workingFrame = _scrollView.frame;

workingFrame.origin.x = 0;

NSMutableArray *images = [NSMutableArray arrayWithCapacity:[info count]];

for (NSDictionary *dict in info) 

{

UIImage *image = [dict objectForKey:UIImagePickerControllerOriginalImage];

[images addObject:image];

UIImageView *imageview = [[UIImageView alloc] initWithImage:image];

[imageview setContentMode:UIViewContentModeScaleAspectFit];

imageview.frame = workingFrame;

workingFrame.origin.x = workingFrame.origin.x + workingFrame.size.width;

self.chosenImages = images;

}

UIImageView *image1=[[UIImageView alloc]initWithFrame:CGRectMake(10, 240, 40, 40)];

image1.image=[images objectAtIndex:0];

[self.view addSubview:image1];

UIImageView *image2=[[UIImageView alloc]initWithFrame:CGRectMake(60, 240, 40, 40)];

image2.image=[images objectAtIndex:1];

[self.view addSubview:image2];

//self.chosenImages = images;

UIImageView *image3=[[UIImageView alloc]initWithFrame:CGRectMake(120, 240, 40, 40)];

image3.image=[images objectAtIndex:2];

[self.view addSubview:image3];

UIImageView *image4=[[UIImageView alloc]initWithFrame:CGRectMake(180, 240, 40, 40)];

image4.image=[images objectAtIndex:3];

[self.view addSubview:image4];

[_scrollView setPagingEnabled:YES];

[_scrollView setContentSize:CGSizeMake(workingFrame.origin.x, workingFrame.size.height)];

}

Answer 1

此错误告诉您正在选择的图像索引超出数组范围。

例如

您的数组在索引[0,1,2,3]处有项目，并且您正在从索引中选择项目，如4和5

Answer 2

您的代码会告诉您崩溃。

UIImageView *image1=[[UIImageView alloc]initWithFrame:CGRectMake(10, 240, 40, 40)];

image1.image=[images objectAtIndex:0];

[self.view addSubview:image1];

UIImageView *image2=[[UIImageView alloc]initWithFrame:CGRectMake(60, 240, 40, 40)];

image2.image=[images objectAtIndex:1];

[self.view addSubview:image2];

//self.chosenImages = images;

UIImageView *image3=[[UIImageView alloc]initWithFrame:CGRectMake(120, 240, 40, 40)];

image3.image=[images objectAtIndex:2];

[self.view addSubview:image3];

UIImageView *image4=[[UIImageView alloc]initWithFrame:CGRectMake(180, 240, 40, 40)];

image4.image=[images objectAtIndex:3];

[self.view addSubview:image4];

如果我选择了2张图片，我会遇到这样的异常：由于终止应用程序未捕获的异常'NSRangeException'，原因：' * - [__ NSArrayM objectAtIndex：]：索引3超出边界[0 .. 2]

在这种情况下，你不能[images objectAtIndex:3]。因为数组只包含2个图像。同样其他情况也是如此。

根据评论更新：

只需尝试在for循环中添加[self.view addSubview:imageview ];，如下所示

for (NSDictionary *dict in info) 

{

    UIImage *image = [dict objectForKey:UIImagePickerControllerOriginalImage];

    [images addObject:image];

    UIImageView *imageview = [[UIImageView alloc] initWithImage:image];

    [imageview setContentMode:UIViewContentModeScaleAspectFit];

    imageview.frame = workingFrame;

    [self.view addSubview:imageview ];

    workingFrame.origin.x = workingFrame.origin.x + workingFrame.size.width;

    self.chosenImages = images;

}

如何在ios中选择多个图像

2 个答案: