iOS闲鱼发布按钮，iOS13tabbar默认颜色选中颜色的一些问题

最近在新的项目中遇到的下面几个问题：

• 项目中需要实现类似闲鱼的发布凸出按钮;

没有自定义tabbar,只是子类化了tabbar

1.设置imageInsets

//     设置图片和文字之间的间
    if ([title isEqualToString:@"发布"]) {
        controller.tabBarItem.imageInsets = UIEdgeInsetsMake(-20, 0, 10, 0);
        controller.tabBarItem.titlePositionAdjustment = UIOffsetMake(0, -2);
    }else{
        controller.tabBarItem.imageInsets = UIEdgeInsetsMake(-3, 0, 3, 0);
        controller.tabBarItem.titlePositionAdjustment = UIOffsetMake(0, -2);
    }

2.在tabbar子类中设置背景图片

- (void)layoutSubviews{
    [super layoutSubviews];
    Class class = NSClassFromString(@"UITabBarButton");
    int btnIndex = 0;
    for (UIView *btn in self.subviews){
        if ([btn isKindOfClass:class]) {
            if (btnIndex == 2) { // btnIndex == 2 的时候， 为中间按钮， 添加一个背景图片
                self.imageView.frame = CGRectMake((btn.width-65)*0.5, -27, 65, btn.height + 10);//CGRectMake(5, -17, btn.lj_width - 10, btn.lj_height + 17)
                
                [btn insertSubview:self.imageView atIndex:0];
                self.btn = btn;
            }
            btnIndex++;
        }
    }
}

3.点击范围的设置

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if (self.isHidden == NO) {
        CGPoint newP = [self convertPoint:point toView:self.imageView];
        //判断如果这个新的点是在发布按钮身上，那么处理点击事件最合适的view就是发布按钮
        if ( [self.imageView pointInside:newP withEvent:event]) {
            return self.btn;
        }else{ //如果点不在发布按钮身上，直接让系统处理就可以了
            return [super hitTest:point withEvent:event];
        }
    }
    else {  //tabbar隐藏了，那么说明已经push到其他的页面了，这个时候还是让系统去判断最合适的view处理就好了
        return [super hitTest:point withEvent:event];
    }
}

• iOS13tarbbar默认文字颜色无法设置
  下面的代码导致的

// 设置样式, 去除tabbar上面的黑线
self.barStyle = UIBarStyleBlack;

1.设置文字颜色

// 设置 tabbarItem 选中状态下的文字颜色(不被系统默认渲染,显示文字自定义颜色)
    NSDictionary *normalDic = [NSDictionary dictionaryWithObject:[AppConfigModel getColor:@"#999696"] forKey:NSForegroundColorAttributeName];
    [controller.tabBarItem setTitleTextAttributes:normalDic forState:UIControlStateNormal];
    NSDictionary *selectedDic = [NSDictionary dictionaryWithObject:[AppConfigModel obtainThemeColor] forKey:NSForegroundColorAttributeName];
    [controller.tabBarItem setTitleTextAttributes:selectedDic forState:UIControlStateSelected];

2.创建其他方法去除tabbar上面的黑线

- (void)removiewTopline{
    
    CGRect rect = CGRectMake(0, 0, [AppConfigModel obtainAllScreenWidth], [AppConfigModel obtainAllScreenHeight]);
    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);

    CGContextFillRect(context, rect);

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();
    [self setShadowImage:img];
}

• iOS13 页面跳转后tabbar选择颜色变成了默认蓝色

在tabbar子类- (void)layoutSubviews方法中增加

self.tintColor =selectColor;