iOS 增加 UIWebView 字体大小

Question

我在 Stack Overflow 上寻找解决方案，但没有找到。我的代码是:

CGRect  rect = _postContentView.bounds;
_postContentUIWV = [[UIWebView alloc] initWithFrame:rect];
[_postContentUIWV loadHTMLString:selectedPostCD.content baseURL:nil];

int fontSize = 30;
NSString *jsString = [[NSString alloc] initWithFormat:
    @"document.getElementsByTagName('span')[0].style.webkitTextSizeAdjust='%d%%'",
    fontSize];
[_postContentUIWV stringByEvaluatingJavaScriptFromString:jsString];

[_postContentView addSubview:_postContentUIWV];

以及 UIWebView 中的 HTML 部分:

<p style="text-align: justify;">
    <span style="line-height: 1.5em;">blablablablablabla</span>
</p>

我的代码不会增加 UIWebView 中的字体大小。我该如何解决？

Answer 1

将_postContentUIWV的创建和初始化相关的代码留在viewDidLoad方法中:

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGRect  rect = _postContentView.bounds;
    _postContentUIWV = [[UIWebView alloc] initWithFrame:rect];
    _postContentUIWV.delegate = self;
    [_postContentUIWV loadHTMLString:selectedPostCD.content baseURL:nil];
    [_postContentView addSubview:_postContentUIWV];
}

将jsString求值相关的代码移到webViewDidFinishLoad方法中:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    int fontSize = 30;
    NSString *jsString = [[NSString alloc] initWithFormat:
        @"document.getElementsByTagName('span')[0].style.webkitTextSizeAdjust='%d%%'",
        fontSize];
    [_postContentUIWV stringByEvaluatingJavaScriptFromString:jsString];
}