我有一个 NSArray 声明为
var GetVehicleData :NSArray!
这是存储在数组中的 Json 数据，
{
"vehicle": "1",
"plate_no": "1111111111",
"vehicle_id": 1,
"pro_pic": "1490258953381.jpg",
"fname": "Test",
"lname": "User 01",
"phone": "+9476112282334",
"passenger_no": 4,
"model": "honda",
"colour": "red",
"driver_id": "3",
"lat": "6.8964",
"lng": "79.8885"
},
{
"vehicle": "2",
"plate_no": "CAQ-1234",
"vehicle_id": 2,
"pro_pic": "1490258754529.jpg",
"fname": "Test",
"lname": "User 2",
"phone": "+9477789424897",
"passenger_no": 4,
"model": "Honda",
"colour": "Black",
"driver_id": "4",
"lat": "6.8876886",
"lng": "79.8628148"
},
{
"vehicle": "3",
"plate_no": "FGH-1234",
"vehicle_id": 3,
"pro_pic": "1490258812119.jpg",
"fname": "Test ",
"lname": "User 3",
"phone": "+9476533142335",
"passenger_no": 1,
"model": "TVS",
"colour": "red",
"driver_id": "6",
"lat": "6.8876901",
"lng": "79.8628141"
}
现在我想根据从谷歌矩阵 API 获得的距离数据交换这些元素。例如，如果我想将此数组的第二个索引元素与其第一个索引元素交换，我应该怎么做？
我试过使用，
swap(&GetVehicleData[1], & GetVehicleData[2])
但它给我这个错误，
Cannot pass immutable value as inout arguments: subscript is get-only
最佳答案
(编辑:以下是我对问题的原始回答，从技术上讲它仍然是准确的，但请注意，除非您对 NSArray/NSMutableArray 有特殊需求，否则 vadian 的建议是使用 Swift 数组更好。)
您不能编辑 NSArray，请改用 NSMutableArray:
var GetVehicleData :NSMutableArray!
关于ios - 如何快速交换 NSArray 元素，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43014028/