Question

我是Swift的新手，我正在使用2D数组进行比较，一旦条件为真，我需要得到行索引，但我得到的错误状态为cannot invoke index with an argument list of type (of:Array<Float>)

我的代码：

var entryCoordinate: [[Float]] = [[130.6,61.0],[167.5,61.0],[204.5,61.0],[243.6,61.0],[281.16,61.0],[315.3,61.0]]

 for indexs in entryCoordinate
        {
            if indexs[0] == startPathPointX && indexs[1] == startPathPointY
            {
                let pathStartElement = indexs.index(of: indexs)
                print(pathStartElement)
            }

            if indexs[0] == endPathPointX && indexs[1] == endPathPointY
            {
                let pathEndElement = indexs.index(of: indexs)
                print(pathEndElement)
            }
        }

Answer 1

从包含startPathPointY和endPathPointY的代码中，你需要比较2D数组中的第二个对象，但是你要继续比较第一个对象，并且你要使用index(where:)和你的数组这样来得到pathStartElement和pathEndElement。

if let pathStartElement = entryCoordinate.index(where: { $0[0] == startPathPointX && $0[1] == startPathPointY }) {
    print(pathStartElement)
}
if let pathEndElement = entryCoordinate.index(where: { $0[0] == endPathPointX && $0[1] == endPathPointY }) {
    print(pathEndElement)
}

Answer 2

试试这段代码：

let myIndexPathStartElement = self.arrImagetData.index(where: { $0[0] == startPathPointX && $0[1] == startPathPointY })

let myIndexPathEndElement = self.arrImagetData.index(where: { $0[0] == endPathPointX && $0[1] == endPathPointY })

如何获取2D数组的行索引？

2 个答案: