如何过滤字符串数组中的斯威夫特

问题描述：

通过使用目标C我有过滤一年阵列使用NSPredicate，如何过滤字符串数组中的斯威夫特

下面是代码。

yearArray = [yearArray filteredArrayUsingPredicate:[NSPredicate 
    predicateWithFormat:@"SELF != ''"]];

按照上面的代码它的工作目标C细，我一定要在斯威夫特3，滤波器阵列

什么是输入年份阵列： -

(Year,"","","",JAN,"","","",FEB,"","","",MAR,"","","",APR,"","","", 
    MAY,"","","",JUN,"","","",JUL,"","","",AUG,"","","",SEP,"","","",OCT 
    ,"","","", NOV,"","","",DEC,"","","","",WIN,"","","",SPR,"","","",SUM 
    ,"","","",AUT,"","","","",ANN)

Need filter Output Array

(Year,JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC,WIN,SPR,SUM,AUT,ANN)

请给解决方案如何快速过滤数组。

答

使用此代码：

let yearArray: [String] = ... // your array of type [String] 

let filteredArray = yearArray.filter { 
    !$0.isEmpty 
}

看图片输出：

我用你的代码，但是它的示值误差，表达的类型是没有更多的上下文暧昧。 –

是你的[String]类型还是不同的数组？ –

字符串类型的NSMutableArray –

答

您可以通过使用过滤器（上Array型）做到这一点：

let filteredArray = yearArray.filter{$0 != ""}

就这么简单。

如果阵列是一个NSMutableArray，只需将其转换为[String]：

if let yearArray = yearArray as? [String] { 
    let filteredArray = yearArray.filter{$0 != ""} 
    // add your code here 
}

'！$ 0.isEmpty'比'$ 0！=“”'更可取。它更好地交流意图。 – Alexander

如何过滤字符串数组中的斯威夫特

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