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lonffreytu avatar lonffreytu commented on July 24, 2024

看了源码，大概找到原因了。这样的实现方式着实让人难以理解。

.van-stepper__minus:before,
.van-stepper__plus:before {
  height: 1px;
  width: 9px
}

.van-stepper__minus:after,
.van-stepper__plus:after {
  height: 9px;
  width: 1px
}

.van-stepper__minus:empty.van-stepper__minus:after,
.van-stepper__minus:empty.van-stepper__minus:before,
.van-stepper__minus:empty.van-stepper__plus:after,
.van-stepper__minus:empty.van-stepper__plus:before,
.van-stepper__plus:empty.van-stepper__minus:after,
.van-stepper__plus:empty.van-stepper__minus:before,
.van-stepper__plus:empty.van-stepper__plus:after,
.van-stepper__plus:empty.van-stepper__plus:before {
  background-color: currentColor;
  bottom: 0;
  content: "";
  left: 0;
  margin: auto;
  position: absolute;
  right: 0;
  top: 0
}

通过以上css代码可以知晓加减号分别是由van-stepper__plus和van-stepper__minus 的before和after实现的。before是横，after是竖（通过定义他们的高和宽实现的）。真机中不显示的原因是因为真机上不兼容background-color: currentColor;，即加减号的颜色是before和after的背景色，背景色又是跟前景色一样（currentColor）。但很可惜小程序不兼容CSS3中的currentColor。
解决办法
修改为直接作用在背景色，而不是前景色上

.van-stepper__minus:empty.van-stepper__minus:after,
.van-stepper__minus:empty.van-stepper__minus:before,
.van-stepper__minus:empty.van-stepper__plus:after,
.van-stepper__minus:empty.van-stepper__plus:before,
.van-stepper__plus:empty.van-stepper__minus:after,
.van-stepper__plus:empty.van-stepper__minus:before,
.van-stepper__plus:empty.van-stepper__plus:after,
.van-stepper__plus:empty.van-stepper__plus:before {
  background-color: var(--stepper-button-icon-color, #323233);
  bottom: 0;
  content: "";
  left: 0;
  margin: auto;
  position: absolute;
  right: 0;
  top: 0
}

/* 禁用时的颜色 */
.van-stepper__minus--disabled.van-stepper__minus:empty.van-stepper__minus:before,
.van-stepper__plus--disabled.van-stepper__plus:empty.van-stepper__plus:before, 
.van-stepper__plus--disabled.van-stepper__plus:empty.van-stepper__plus:after {
  background-color: var(--stepper-button-disabled-icon-color, #c8c9cc)
}

希望官方能解决一下这个bug

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lonffreytu avatar lonffreytu commented on July 24, 2024

补充一下 是在skyline渲染模式下会出现该问题

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landluck avatar landluck commented on July 24, 2024

补充一下 是在skyline渲染模式下会出现该问题

目前还未统一支持 skyline 模式。后面会考虑统一支持。

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