UIColor RGB颜色对照表
http://blog.csdn.net/sqc3375177/article/details/9198765
UIButton *customButton = [UIButton buttonWithType:UIButtonTypeCustom];
【IOS 按钮字体颜色设置】 [customButton setTitleColor:_btnFontColor forState:UIControlStateNormal];
// customButton.titleLabel.textColor = _btnFontColor;
