karamay_wx/custom-tab-bar/index.wxss

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 78px;
  background: white;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-border {
  background-color: rgba(0, 0, 0, 0.33);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  transform: scaleY(0.5);
}

.tab-bar-item {
  position: relative;
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.tab-bar-item-center{
  flex: 1.5;
}
.tab-bar-item-center-border{
  position: absolute;
  top: -16px;
  width: 84px;
  height: 74px;
  border-radius: 43px 43px 43px 43px;
  box-shadow: 0px -4px 4px 0px rgba(0,0,0,0.25);
  background: #fff;
  padding-top: 10px;
}
.tab-bar-item-text{
  position: absolute;
  top: 58px;
}
.tab-bar-item image {
  width: 48px;
  height: 48px;
}

.tab-bar-item view {
  font-size: 10px;
}

/* 中间特殊按钮样式 */
.tab-bar-item-center image {
  width: 54px;
  height: 54px;
}
.tab-bar-item-center view {
  font-size: 10px;
}