Find pairs if sum of two integers is equal to the given value

var arr = [2,5,4,6,3,7,8]
var temp = [Int]()
var result = [[Int]]()
let sum = 11
var i = 0
var j = i + 1
while(i < (arr.count - 1)) {
    if(arr[i] + arr[j] == sum) {
        temp.append(arr[i])
        temp.append(arr[j])
        result.append(temp)
    }
    if(j == arr.count - 1) {
        i = i + 1
        j = i + 1
    }else {
        if(i == arr.count - 2){
            break
        }
        j = j + 1
    }
    temp.removeAll()
}
print(result)