导航栏统一样式 和 渐变色

渐变色

• 设置颜色
  self.navigationController.navigationBar.barTintColor = [UIColor orangeColor];
• 滚动视图时设置透明度

 -(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    self.navigationController.navigationBar.alpha = scrollView.contentOffset.y/100;
}

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设置导航栏统一颜色

if ([UIDevice currentDevice].systemVersion.floatValue >= 7.0) {      
            [[UINavigationBar appearance] setBarTintColor:RGBACOLOR(78, 188, 211, 1)];
            [[UINavigationBar appearance] setTitleTextAttributes:
             [NSDictionary dictionaryWithObjectsAndKeys:RGBACOLOR(245, 245, 245, 1), NSForegroundColorAttributeName, [UIFont systemFontOfSize:20.0], NSFontAttributeName, nil]];
        }