持续创造，加速成长！这是我参加「日新计划 10 月更文挑战」的第1天，点击查看活动概况

前言

技术完成关键点：经过layer.shadowOpacity和View.layer.shadowOffset 完成

I 去掉TabBar的顶部黑线，添加发光的暗影

• setupshadowColor

- (void)setupshadowColor{
    UIView * tmpView = self;
    tmpView.layer.shadowColor = [UIColor blackColor].CGColor;//设置暗影的色彩
    tmpView.layer.shadowOpacity = 0.08;//设置暗影的透明度
    tmpView.layer.shadowOffset = CGSizeMake(kAdjustRatio(0), kAdjustRatio(-5));//设置暗影的偏移量,暗影的大小，x往右和y往下是正
    tmpView.layer.shadowRadius = kAdjustRatio(5);//设置暗影的圆角,//暗影的分散规模，相当于blur radius，也是shadow的突变间隔，从外围开端，往里突变shadowRadius间隔
//去掉TabBar的顶部黑线    
[self setBackgroundImage:[UIImage createImageWithColor:[UIColor clearColor]]];
[self setShadowImage:[UIImage createImageWithColor:[UIColor clearColor]]];
}

II 给视图底部添加发光的暗影

2.1 作用

2.2 代码完成

• QCTShadowView

@implementation QCTShadowView
- (instancetype)init
{
    self = [super init];
    if (self) {
        [self setupshadowColor];
//
    }
    return self;
}
- (void)layoutSubviews{
    [super layoutSubviews];
    [self layoutIfNeeded];
    [self.layer layoutIfNeeded];
    [self setupshadowColor];
}
- (void) setupshadowColor{
    UIView * tmpView = self;
    tmpView.layer.shadowColor = [UIColor blackColor].CGColor;//设置暗影的色彩
    tmpView.layer.shadowOpacity = 0.08;//设置暗影的透明度
    tmpView.layer.shadowOffset = CGSizeMake(kAdjustRatio(0), kAdjustRatio(5));//设置暗影的偏移量,暗影的大小，x往右和y往下是正
    tmpView.layer.shadowRadius = kAdjustRatio(5);//设置暗影的圆角,//暗影的分散规模，相当于blur radius，也是shadow的突变间隔，从外围开端，往里突变shadowRadius间隔
}

III、其他小知识点

3.1 防止selectedViewController视图被TabBar挡住

• 过错束缚

        [_vcView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.edges.offset(0);
        }];

• 正确束缚

        [_vcView mas_makeConstraints:^(MASConstraintMaker *make) {
                [tmp mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(weakSelf.view).offset(0);
            make.right.equalTo(weakSelf.view).offset(- 0);
            make.top.equalTo(weakSelf.view).offset(0);
            make.bottom.equalTo(weakSelf.view).offset(-weakSelf.tabBarController.tabBar.bounds.size.height);//防止视图被TabBar挡住
        }];
        }];

3.2 iOS 13适配深色模式【设置UITabBarItem上title色彩】

blog.csdn.net/z929118967/…

    // 适配iOS13导致的bug
    if (@available(iOS 13.0, *)) {
        // iOS 13以上
//        self.tabBar.tintColor = ;
        self.tabBar.unselectedItemTintColor = ktabNorTextColor;
        self.tabBar.tintColor = ktabSelectedTextColor;
//        self.tabBar.unselectedItemTintColor = ;
//        UITabBarItem *item = [UITabBarItem appearance];
//        item.titlePositionAdjustment = UIOffse/tMake(0, -2);
//        [item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateNormal];
//        [item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12]} forState:UIControlStateSelected];
    } else {
//        // iOS 13以下
//        UITabBarItem *item = [UITabBarItem appearance];
//        item.titlePositionAdjustment = UIOffsetMake(0, -2);
//        [item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12], NSForegroundColorAttributeName:RGB_HEX(0x999999)} forState:UIControlStateNormal];
//        [item setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12], NSForegroundColorAttributeName:RGB_HEX(0xfb5400)} forState:UIControlStateSelected];
        //设置文字样式
        NSMutableDictionary *textAttr = [NSMutableDictionary dictionary];
        textAttr[NSForegroundColorAttributeName] = ktabNorTextColor;
        [childVC.tabBarItem setTitleTextAttributes:textAttr forState:UIControlStateNormal];
        //挑选状态的文字色彩样式
        NSMutableDictionary *selectedTextAttr = [NSMutableDictionary dictionary];
        [selectedTextAttr setValue:ktabSelectedTextColor forKey:NSForegroundColorAttributeName];
        [childVC.tabBarItem setTitleTextAttributes:selectedTextAttr forState:UIControlStateSelected];
    }

3.3 适配安全区域间隔(safeAreaInsets)

blog.csdn.net/z929118967/…

使用场景1：自定义导航栏内容，导航栏显示公告和标题

使用场景2：自定义视图底部工具栏

使用场景3: 适配上拉加载更多控件 _vcView.tableView.mj_footer.ignoredScrollViewContentInsetBottom = k_ignoredScrollViewContentInsetBottom;

see also

iOS小技能：自定义导航栏，设置全局导航条外观。（iOS15适配） blog.csdn.net/z929118967/…