ios - 如何过滤数组中的很多项

Question

我正在尝试快速过滤一个数组，当我只是想过滤一些东西时它工作得很好但是当我添加到列表时我得到这个错误:

Expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions

这是我的错误代码:

filteredArray = workArray.filter { $0.stateName.localizedCaseInsensitiveContainsString(searchString!) || $0.firstName.localizedCaseInsensitiveContainsString(searchString!) || $0.lastName.localizedCaseInsensitiveContainsString(searchString!) || $0.countyName.localizedCaseInsensitiveContainsString(searchString!) || $0.cityName.localizedCaseInsensitiveContainsString(searchString!) || $0.communityName.localizedCaseInsensitiveContainsString(searchString!) || $0.sectionName.localizedCaseInsensitiveContainsString(searchString!) || $0.notes.localizedCaseInsensitiveContainsString(searchString!) || $0.email1.localizedCaseInsensitiveContainsString(searchString!) || $0.email2.localizedCaseInsensitiveContainsString(searchString!) || $0.email3.localizedCaseInsensitiveContainsString(searchString!) || $0.title.localizedCaseInsensitiveContainsString(searchString!) || $0.jobsiteID.localizedCaseInsensitiveContainsString(searchString!)}

我试过像这样拆分这个过程

filteredArray = workArray.filter { $0.stateName.localizedCaseInsensitiveContainsString(searchString!) || $0.firstName.localizedCaseInsensitiveContainsString(searchString!) || $0.lastName.localizedCaseInsensitiveContainsString(searchString!) || $0.countyName.localizedCaseInsensitiveContainsString(searchString!) || $0.cityName.localizedCaseInsensitiveContainsString(searchString!) || $0.communityName.localizedCaseInsensitiveContainsString(searchString!) || $0.sectionName.localizedCaseInsensitiveContainsString(searchString!) || $0.notes.localizedCaseInsensitiveContainsString(searchString!) || $0.email1.localizedCaseInsensitiveContainsString(searchString!)}

和

filteredArray.appendContentsOf(workArray.filter { $0.email2.localizedCaseInsensitiveContainsString(searchString!) || $0.email3.localizedCaseInsensitiveContainsString(searchString!) || $0.title.localizedCaseInsensitiveContainsString(searchString!) || $0.jobsiteID.localizedCaseInsensitiveContainsString(searchString!)})

但是我在数组中得到了重复的对象。

我可以写一些其他的东西来查找和删除重复的对象，但我宁愿不这样做。我的问题是我应该如何过滤所有这些项目。

谢谢大家的帮助

Answer 1

将表达式的庞然大物分解为数据类型的方法。

extension MyDataThingy {

    func anyFieldContains(searchTerm term: String) -> Bool {

        let fieldValues = [self.stateName, self.firstName, /* etc. */]
        for value in fieldValues {
            if value.localizedCaseInsensitiveContainsString(term) {
                return true
            }
        }
        return false
    }
}

然后:

filteredArray = workArray.filter { $0.anyFieldContains(searchTerm: searchTerm) }

这将修复类型推理引擎的超时错误。它还更具可读性、易理解性和可维护性。