Swift开关语句，用于匹配字符串的子字符串 [英] Swift switch statement for matching substrings of a String

问题描述

我正在尝试从变量中获取一些值. 该变量将具有天气的描述，我想询问特定的单词以显示不同的图像(例如，太阳，雨水或类似的东西) 事情是我有这样的代码:

Im trying to ask for some values from a variable. The variable is going to have the description of the weather and i want to ask for specific words in order to show different images (like a sun, rain or so) The thing is i have code like this:

    if self.descriptionWeather.description.rangeOfString("Clear") != nil
{
    self.imageWeather.image = self.soleadoImage
}
if self.descriptionWeather.description.rangeOfString("rain") != nil
{
    self.imageWeather.image = self.soleadoImage
}
if self.descriptionWeather.description.rangeOfString("broken clouds") != nil
{
    self.imageWeather.image = self.nubladoImage
}

因为当我尝试添加"OR"条件时，xcode给了我一些奇怪的错误.

Because when i tried to add an "OR" condition xcode gives me some weird errors.

有可能用这样的句子做一个夹心句子吗?还是有人知道如何在if子句中添加OR条件?

Is it possible to do a swich sentence with that? Or anyone knows how to do add an OR condition to the if clause?

推荐答案

Swift语言具有两种OR运算符-按位运算符|(单竖线)和逻辑运算符||(双竖线)线).在这种情况下，您需要逻辑OR:

Swift language has two kinds of OR operators - the bitwise ones | (single vertical line), and the logical ones || (double vertical line). In this situation you need a logical OR:

if self.descriptionWeather.description.rangeOfString("Clear") != nil || self.descriptionWeather.description.rangeOfString("clear") != nil {
    self.imageWeather.image = self.soleadoImage
}

与Objective-C不同，在Objective-C中，您可以放弃按位的OR来换取稍有不同的运行时语义，而Swift则需要在上面的表达式中添加逻辑OR.

Unlike Objective-C where you could get away with a bitwise OR in exchange for getting a slightly different run-time semantic, Swift requires a logical OR in the expression above.

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