1 秒后使用淡入淡出的动画突出显示文本的背景颜色

Question

我现在正在实现一本电子书，当文本的音频播放时，我必须在其中突出显示每个单词。突出显示的颜色将在 2 秒后消失。我们如何为文本添加背景颜色。我没有使用 UILabel，因为有很多句子的冗长文本。 我们应该怎么做？任何人请帮忙！谢谢！

Answer 1

            I think u should use UIWebView rather than UITextView,  and dynamically u can 
    highlight the text by adding html tags and style tag around a particular string. But
 for that u need to track which string or text audio is playing. Both of these operations
 should be performed simultaneously,i.e., Audio Playing and attaching tags aroynd the tags. 

Now if u want to fade off the color of the text after two seconds , simply call function
after delay of two seconds, in which u can change the text color back to earlier on.
 To call function after delay u should go for

[self performSelector:@selector(changeTooriginalColor) withObject:nil afterDelay:2]; 

第二个问题的答案：

UIWebView *wizardSpeechWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0,100,320,265)];
wizardSpeechWebView.backgroundColor = [UIColor clearColor];
wizardSpeechWebView.opaque = NO; 
wizardSpeechWebView.delegate = self;
[self.view addSubview:wizardSpeechWebView];