如何在多个类视图中使用function GetPaths(moves,possiblePaths) {
var paths = [];
var allmoves=[];
for (var x = 0 ; x < moves.length ; x++) {
var path = [];
var move = [];
var data2 = [];
data2.push([moves[x].from, moves[x].to]);
for (var y = x + 1 ; y < moves.length ; y++) {
if (moves[x].to == moves[y].from) {
if (!(path.includes(data2[0]))) {
path.push(data2[0]);
move.push(moves[x]);
}
var data = [moves[y].from, moves[y].to];
path.push(data);
move.push(moves[y]);
}
}
if (path.length > 0) paths.push(path);
if (move.length > 0) {
allmoves.push(move);
}
}
if (paths.length>1) {
var newpaths = [];
var newmoves =[];
var nextRow = paths[0];
var nextmove = allmoves[0];
var len = paths.length;
for (var h = 1 ; h < nextRow.length; h++) {
for (var j = 1 ; j < len ; j++) {
var newpath = [];
var newmove =[];
if (isInArray(nextRow[h], paths[j][0])) {
newpath.push(nextRow[0]);
newmove.push(nextmove[0]);
var nextfound = false;
for (var k = j + 1 ; k < paths.length ; k++) {
if (isInArray(paths[j][paths[j].length - 1], paths[k][0])) {
newpath.push(paths[j][0]);
if (paths[k][0][0] - paths[k][0][1] != -(paths[k][1][0] - paths[k][1][1])) {
newpath.push(paths[k]);
newmove.push(allmoves[k]);
} else {
newpath.push(paths[k][0]);
newmove.push(allmoves[k][0]);
}
nextfound = true;
}
}
if (!nextfound) {
newpath.push(paths[j]);
newmove.push(allmoves[j]);
}
}
if (newpath.length > 0) {
newpaths.push(newpath);
newmoves.push(newmove);
}
}
}
return newmoves;
}
return allmoves;
}
。
已更新完整代码!!!
onCompleted答案 0 :(得分：2)
要点1
您应该在下一行中出现错误
let static shared = Service()
因为应该先使用static关键字，然后再声明。
static let shared = Service()
要点2
用完成处理程序实现onDownload功能
func doDownload(onCompleted: @escaping ()->()) {
onCompleted()
}
调用以下函数
let service = Service.shared
service.doDownload { () in
print("Called in completion Handler")
}
有关闭合的更多详细信息，请通过以下链接。 Closures
答案 1 :(得分：1)
删除属性onCompleted并使其成为doDownload方法的参数的示例：
class Service {
let static shared = Service()
func doDownload(onCompleted: (()->())?) {
//...
onCompleted?()
}
}
答案 2 :(得分：1)
您在viewDidLoad中的代码看起来不错，但是您是否可以重新访问您的singleton类，并且可以在添加调用super.init的私有init方法之后尝试运行代码，看看您的代码是否有效。