IOS导航栏颜色渐变与常用属性

导航栏背景色设置:
self.navigationController.navigationBar.barTintColor = [UIColor greenColor];

导航栏标题颜色字体大小
    NSMutableDictionary *attrs = [NSMutableDictionary dictionary];

    attrs[NSForegroundColorAttributeName] = [UIColor whiteColor];

    attrs[NSFontAttributeName] = [UIFont systemFontOfSize:17];

    [self.navigationController.navigationBar setTitleTextAttributes:attrs];

导航栏左右item
 UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithTitle:@"left" style:UIBarButtonItemStylePlain target:self action:@selector(left)];

  self.navigationItem.leftBarButtonItem = leftItem;

  UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithTitle:@"right" style:UIBarButtonItemStylePlain target:self action:@selector(right)];   

    self.navigationItem.rightBarButtonItem = rightItem;

导航栏item字体颜色
 self.navigationController.navigationBar.tintColor = [UIColor redColor];如果要不同item不同颜色，那么item要带一个自定义按钮，在设置按钮属性

当前控制器的下一个控制器的返回item去掉文字只保留箭头
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:self action:@selector(back)];

 self.navigationItem.backBarButtonItem = backItem;

导航栏透明与导航栏底部分割线，如果有图片高为64的话，直接设置图片就可以了，除此之外还可以用代码，这边的例子全部用代码背景色转图片来设置，先设置整个view的背景色为
 self.view.backgroundColor = [UIColor greenColor];如果透明看到的就是绿色。然后在分别设置

 [self.navigationController.navigationBar setBackgroundImage:[self imageWithBgColor:[UIColor colorWithRed:1 green:1 blue:1 alpha:0]] forBarMetrics:UIBarMetricsDefault];

   [self.navigationController.navigationBar setShadowImage:[self imageWithBgColor:[UIColor colorWithRed:1 green:1 blue:1 alpha:0]]];这样就是透明的了

如果要监听滚动而使导航栏颜色渐变，那么可以在scrollView的代理方法中添加这样的代码

-(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

     [self.navigationController.navigationBar setBackgroundImage:[self imageWithBgColor:[UIColor colorWithRed:1 green:0 blue:0 alpha:self.tableView.contentOffset.y / 100]] forBarMetrics:UIBarMetricsDefault];

}
这边用的imageWithBgColor方法

-(UIImage *)imageWithBgColor:(UIColor *)color {

    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context = UIGraphicsGetCurrentContext();    

    CGContextSetFillColorWithColor(context, [color CGColor]);

    CGContextFillRect(context, rect);

     UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

     return image;

}

https://github.com/forkingdog/FDFullscreenPopGesture