uniapp dynamic style cannot use upx

uniapp dynamic style cannot use upx

uniapp is a cross-platform development framework developed based on the Vue framework. It can compile and convert the same code into applications for various platforms, such as Android and iOS. , Web, WeChat applet, Alipay applet, etc. Its development efficiency and operating efficiency are relatively good, and it is widely favored by developers. In the development process of uniapp, we often use style-related code, among which dynamic style is a common technique that can achieve some very flexible effects. However, there is a big problem with uniapp's dynamic style, that is, upx cannot be used for unit conversion.

upx is a unit that is converted based on the physical pixels of the device, which can make the performance of the application more consistent on different devices. In uniapp, we usually use upx as the unit to write CSS styles, which can ensure that the display effect of the application on various mobile phones is relatively stable. However, when using uniapp dynamic style, we found that upx could not perform effective conversion, resulting in differences in the effects displayed on mobile phones with different resolutions.

The reason is that uniapp's dynamic style is implemented through string concatenation, while upx can only take effect when writing CSS styles. When we use upx in dynamic style, it is actually parsed as a string, thus losing the role of unit conversion. For example, if we want to set an element with a width of 50upx in dynamic style, the writing should be similar to this:

<view :style="{width: '50upx'}"></view>

However, since upx cannot be converted in dynamic style, it is set like this The width is actually 50 string units, not 50 upx units. This results in different effects displayed on mobile phones with different resolutions, affecting the stability of the application and the user experience.

Of course, in the actual development process, we still have some methods to avoid this problem. First of all, we can use pixels (px) as the unit in dynamic style, so that the effects displayed on mobile phones with different resolutions are relatively close. Secondly, we can predefine some rules in the CSS style, and then use the class name in the dynamic style to obtain the style, so as to avoid the problem of upx being unable to be converted. The sample code is as follows:

/* 定义一个名为setting的类 */
.setting {
  margin: 20upx;
  padding: 10upx;
}

<view :class="'setting'"></view>

Although this writing method is more troublesome, it can ensure that the effect displayed on various mobile phones is relatively stable. In addition, the uniapp development team is also constantly improving the support for dynamic styles. Support for upx units may be added in subsequent versions to provide developers with a more flexible development method.

To sum up, although the problem that uniapp dynamic style cannot use upx exists, it will not affect our development of excellent cross-platform applications. You only need to pay attention to some details during the development process to ensure that the display effect of the application on various mobile phones is relatively stable. As uniapp continues to improve, I believe this problem will be better solved.

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