主队列中的方法

Question

告诉我如何在主队列上执行方法

我有3个metods缩放html，后缩放隐藏的WebView

- (void)updateContentWidth
{
    [self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"setContentWidth('%d%%')", (int)(self.articleContentWidth*100)]];
}

- (void)updateLineHeight
{
    [self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"setLineHeight('%d%%')", (int)(self.articleLineHeight*100)]];

}
- (void)updateFontSize
{
    [self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"setFontSize('%d%%')", (int)(self.fontSizeRatio*100)]];
}

Answer 1

使用下面的代码，你可以在主线程中调用任何方法或块：

    dispatch_sync(dispatch_get_main_queue(), ^{
        // write or call method here
    });

Answer 2

试试这个

[self performSelectorOnMainThread:@selector(updateContentWidth)
                       withObject:nil
                    waitUntilDone:YES/NO-To block/not block the current thread];