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iphone - UIAccessibility VoiceOver 宣布 UIScrollView 的页码错误

转载 作者:行者123 更新时间:2023-12-03 20:15:20 26 4
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我正在尝试使现有应用程序尽可能易于访问以进行语音传输。

目前,我有一个 uiviewcontroller,它基本上是一个分页照片 View ,在 uiscrollView (tourScrollView) 下方有一个 uipagecontrol,指示当前正在查看的图像/页面。

这是计算当前页面的代码:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
CGFloat pageWidth = scrollView.frame.size.width;
self.tourScrollView.isAccessibilityElement = NO;
scrollView.isAccessibilityElement = NO;
int currentPage = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = currentPage;
}

页面计算代码运行完美。

总共显示 5 张图片。

启用画外音后,当 ScrollView 滚动时,而不是继续滚动

page 1 of 5
page 2 of 5
page 3 of 5
page 4 of 5
page 5 of 5

事情是这样的。

page 1 of 6
page 2 of 6
page 3 of 6
page 5 of 6
page 6 of 6

这是将图像添加到 ScrollView 的代码

-(void)addImagesToScrollview{

NSArray *welcomeImages = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"img-01.png"],
[UIImage imageNamed:@"img-02.png"],
[UIImage imageNamed:@"img-03.png"],
[UIImage imageNamed:@"img-04.png"],
[UIImage imageNamed:@"img-05.png"],nil];

CGRect scrollViewFrame = tourScrollView.frame;
CGFloat scrollViewWidth = scrollViewFrame.size.width;
CGFloat scrollViewHeight = scrollViewFrame.size.height;
CGFloat imageX;
for (int i = 0; i<[welcomeImages count]; i++) {

int index = i;
imageX = (scrollViewWidth*index) + (scrollViewWidth - IMAGE_WIDTH)/2.0;

CGRect boarderViewRect = CGRectMake(imageX, 20.0f, IMAGE_WIDTH, IMAGE_HEIGHT);

UIView *whiteBorderView = [[UIView alloc] initWithFrame:boarderViewRect];
whiteBorderView.backgroundColor = [UIColor whiteColor];

UIImageView *imageView = [[UIImageView alloc]initWithImage:[welcomeImages objectAtIndex:i]];
CGRect imageRect = CGRectInset(boarderViewRect, IMAGE_INSET, IMAGE_INSET);
imageView.frame = imageRect;

CGRect descriptionRect = CGRectMake((scrollViewWidth*index) + 20.0f, imageRect.origin.y + imageRect.size.height+10, 280, 90);
CGSize maximumLabelSize = CGSizeMake(descriptionRect.size.width,120);
descriptionRect.size = [[self descriptionForIndex:i] sizeWithFont:[UIFont systemFontOfSize:16.0] constrainedToSize:maximumLabelSize lineBreakMode:UILineBreakModeTailTruncation];
UILabel *imageDescription = [[UILabel alloc] initWithFrame:descriptionRect];
imageDescription.text = [NSString stringWithFormat:@"%@",[self descriptionForIndex:i]];
imageDescription.numberOfLines = 0;
imageDescription.backgroundColor = [UIColor clearColor];
imageDescription.font = [UIFont systemFontOfSize:16.0];
imageDescription.textColor = [UIColor colorWithRed:(119.0/255.0) green:(119.0/255.0) blue:(119.0/255.0) alpha:1.0];
imageDescription.textAlignment = UITextAlignmentCenter;
imageDescription.shadowColor = [UIColor whiteColor];
imageDescription.shadowOffset = CGSizeMake(0,1);

[tourScrollView addSubview:whiteBorderView];
[tourScrollView addSubview:imageView];
[tourScrollView addSubview:imageDescription];

if (i == [welcomeImages count]-1) {
tourScrollView.contentSize = CGSizeMake(imageView.frame.origin.x + scrollViewWidth -((scrollViewWidth - IMAGE_WIDTH)/2.0), scrollViewHeight);
}
}
}

如果有人为我指明正确的方向,让我通过语音说出正确的页码,我将不胜感激。

更新:启用/禁用 pagingEnabled 没有区别。我认为 VoiceOver 会覆盖我根据 ScrollView 大小进行的分页计算。

最佳答案

解决方法如下:

删除了注释代码,并在for循环外添加了一行内容大小

-(void)addImagesToScrollview{

NSArray *welcomeImages = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"img-01-welcome.png"],
[UIImage imageNamed:@"img-02-welcome.png"],
[UIImage imageNamed:@"img-03-welcome.png"],
[UIImage imageNamed:@"img-04-welcome.png"],
[UIImage imageNamed:@"img-05-welcome.png"],nil];

CGRect scrollViewFrame = tourScrollView.frame;
CGFloat scrollViewWidth = scrollViewFrame.size.width;
CGFloat scrollViewHeight = scrollViewFrame.size.height;
CGFloat imageX;
for (int i = 0; i<[welcomeImages count]; i++) {

int index = i;
imageX = (scrollViewWidth*index) + (scrollViewWidth - IMAGE_WIDTH)/2.0;

CGRect boarderViewRect = CGRectMake(imageX, 20.0f, IMAGE_WIDTH, IMAGE_HEIGHT);

UIView *whiteBorderView = [[UIView alloc] initWithFrame:boarderViewRect];
whiteBorderView.backgroundColor = [UIColor whiteColor];

UIImageView *imageView = [[UIImageView alloc]initWithImage:[welcomeImages objectAtIndex:i]];
CGRect imageRect = CGRectInset(boarderViewRect, IMAGE_INSET, IMAGE_INSET);
imageView.frame = imageRect;

CGRect descriptionRect = CGRectMake((scrollViewWidth*index) + 20.0f, imageRect.origin.y + imageRect.size.height+10, 280, 90);
CGSize maximumLabelSize = CGSizeMake(descriptionRect.size.width,120);
descriptionRect.size = [[self descriptionForIndex:i] sizeWithFont:[UIFont systemFontOfSize:16.0] constrainedToSize:maximumLabelSize lineBreakMode:UILineBreakModeTailTruncation];
UILabel *imageDescription = [[UILabel alloc] initWithFrame:descriptionRect];
imageDescription.text = [NSString stringWithFormat:@"%@",[self descriptionForIndex:i]];
imageDescription.numberOfLines = 0;
imageDescription.backgroundColor = [UIColor clearColor];
imageDescription.font = [UIFont systemFontOfSize:16.0];
imageDescription.textColor = [UIColor colorWithRed:(119.0/255.0) green:(119.0/255.0) blue:(119.0/255.0) alpha:1.0];
imageDescription.textAlignment = UITextAlignmentCenter;
imageDescription.shadowColor = [UIColor whiteColor];
imageDescription.shadowOffset = CGSizeMake(0,1);

[tourScrollView addSubview:whiteBorderView];
[tourScrollView addSubview:imageView];
[tourScrollView addSubview:imageDescription];

// if (i == [welcomeImages count]-1) {
// tourScrollView.contentSize = CGSizeMake(imageView.frame.origin.x + scrollViewWidth -((scrollViewWidth - IMAGE_WIDTH)/2.0), scrollViewHeight);
// }
}
tourScrollView.contentSize = CGSizeMake(320.0*[welcomeImages count], scrollViewHeight);
}

我仍然不确定为什么 VO 会弄乱页码。修复前后的 ScrollView 行为仍然相同(弹跳和分页工作相同)。

如果我进一步了解此问题,我将更新答案。

关于iphone - UIAccessibility VoiceOver 宣布 UIScrollView 的页码错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11679504/

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