1，粗体
label.font = UIFont(name: "Helvetica-Bold", size: 32/2)
2，pageControl
pageControl.pageIndicatorTintColor = UIColor.grayColor()
pageControl.currentPageIndicatorTintColor = UIColor(white: 0.7, alpha: 0.5)
3，
原文：http://www.cnblogs.com/developer-qin/p/4081871.html