我正在编写一个关于数学测试随机生成器的程序。 但是当我创建一个随机操作时。我使用arc4random_uniform（）来创建一个随机数。这是功能。
func generateQuestion() {
var randomoperation:UInt32 = arc4random_uniform(3)
if randomoperation == 0 {
operation = "+"
}
if randomoperation == 1 {
operation = "-"
}
if randomoperation == 2 {
operation = "X"
}
if randomoperation == 3 {
operation = "/"
}
}
这会在swift中创建错误“无法分配值类型”字符串“以键入”UILabel“ 你是如何解决这个问题的？
答案 0 :(得分：1)
files=240
buffers=60
答案 1 :(得分：0)
我认为<!DOCTYPE html>
<html ng-app="app">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.19/angular.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<!--our controller-->
<div ng-controller="ItemController">
<button id="get-items-button" ng-click="getItems()">Get Items</button>
<p>Look at the list of items!</p>
<!--this table shows the items we get from our service-->
<table cellpadding="0" cellspacing="0">
<thead>
<tr>
<th>Description</th>
<th>Done</th>
<th>Title</th>
<th>URI</th>
</tr>
</thead>
<tbody>
<!--repeat this table row for each task in tasks-->
<tr ng-repeat="task in tasks">
<td>{{task.description}}</td>
<td>{{task.done}}</td>
<td>{{task.title}}</td>
<td>{{task.uri}}</td>
</tr>
</tbody>
</table>
</div>
<script>
(function () {
//create our module
angular.module('app', [])
//add controller
.controller('ItemController', function ($scope, $http) {
//declare an array of items. this will get populated with our ajax call
$scope.tasks = [];
//declare an action for our button
$scope.getItems = function () {
//perform ajax call.
$http({
url: "/todo/api/v1.0/tasks",
method: "GET"
}).success(function (data, status, headers, config) {
//copy the data we get to our items array. we need to use angular.copy so that
//angular can track the object and bind it automatically.
angular.copy(data.tasks, $scope.tasks);
}).error(function (data, status, headers, config) {
//something went wrong
alert('Error getting data');
});
}
});
console.log($scope.tasks);
})();
</script>
</body>
</html>
是您的标签名称，因此您可以通过以下方式为其指定文字：
operation阅读此Apple Documentation以获取更多信息。