导航栏相关知识

一、从坐标（0，0）从导航栏下面算起

self.edgesForExtendedLayout=UIRectEdgeBottom;

二、导航栏是否半透明

self.navigationController.navigationBar.translucent = NO;

三、导航栏隐藏

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

四、导航栏背景颜色的设置

// 将导航栏背景变为紫色

self.navigationController.navigationBar.barTintColor = [UIColor purpleColor];

//  将状态栏和导航栏字体全变为白色
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

　　

五、设置导航栏的title字体大小、颜色

    [self.navigationBar setTitleTextAttributes:@{
                                                 NSForegroundColorAttributeName : GMainBgColor_323232,
                                                 NSFontAttributeName : GTextFont_16
                                                  }];

　　

六、导航栏（包括状态栏）设置背景图片

 UIImage *backGroundImage = [UIImage imageNamed:@"home_nav_bg"];
 backGroundImage = [backGroundImage resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeStretch]; // 这一句解决导航栏平铺问题，尤其在渐变色背景图片时
 [self.navigationController.navigationBar setBackgroundImage:backGroundImage forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
 [self.navigationController.navigationBar setShadowImage:[UIImage new]];