检查 NSIndexPath 的行和部分的开关 [英] switch that checks NSIndexPath's row and section

问题描述

我想设置一个 switch 语句来检查 NSIndexPath 的值.NSIndexPath 是一个类，它由(除其他外)部分和行(indexPath.row, indexPath.section)

I would like to set a switch statement that checks for a value if NSIndexPath. NSIndexPath is a class and it consists(among other things) of section and row (indexPath.row, indexPath.section)

这就是我如何制定一个 if 语句来同时检查一行和一个部分:

this is how I would formulate an if statement to check for a row and a section at the same time:

if indexPath.section==0 && indexPath.row == 0{
//do work
}

什么是快速切换翻译?

推荐答案

一种方式(这是可行的，因为 NSIndexPaths 本身是等价的):

One way (this works because NSIndexPaths themselves are equatable):

switch indexPath {
case NSIndexPath(forRow: 0, inSection: 0) : // do something
// other possible cases
default : break
}

或者您可以使用元组模式对整数进行测试:

Or you could just test against integers, using a tuple pattern:

switch (indexPath.section, indexPath.row) {
case (0,0): // do something
// other cases
default : break
}

另一个技巧是使用 switch true 和您已经使用的相同条件:

Another trick is to use switch true and the same condition you're already using:

switch true {
case indexPath.row == 0 && indexPath.section == 0 : // do something
// other cases
default : break
}

就我个人而言，我会使用 nested switch 语句来测试外部的 indexPath.section 和 indexPath.row 在里面.

Personally, I would use nested switch statements where we test against indexPath.section on the outside and indexPath.row on the inside.

switch indexPath.section {
case 0:
    switch indexPath.row {
    case 0:
        // do something
    // other rows
    default:break
    }
// other sections (and _their_ rows)
default : break
}

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