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我想扩展数组来返回一个子数组。 行令b = arr.objectsAtIndexes([1,3,5])产生类型的误差“值 '[INT]' 没有成员 'objectsAtIndexes' Swift:扩展数组,值类型_没有成员_
import Foundation
var arr = [Int](6..<19)
let b = arr.objectsAtIndexes([1,3,5])
b = b.append(1)
extension Array {
func objectsAtIndexes(indexes: [Int]) -> [Element] {
var returnArray = [Element]()
for i in indexes {
returnArray.append(self[i])
}
return returnArray
}
}