父视图不会更新自动布局中的框架

Question

我无法在自动布局中更新视图框。

[self setNeedsLayout];
[self.txtInfo setFont:WWLATOBLACK(15)];
[self.txtInfo setTextColor:ColorFromRGB(COLOR_CALLOUTINFO)];
self.txtInfo.lineBreakMode = NSLineBreakByTruncatingTail;
self.txtInfo.text = self.result[[NSString stringWithFormat:@"%@%@",SERVER_NAME, [LocalizationHelper getExtForLocale]]];
self.txtInfo.numberOfLines = 0;