Question

嗨，我有一个离子项目的代码笔。

它现在只显示一个图像，我已经制作了两个按钮来放大和缩小。

问题是，当我点击放大并滚动到最右边或右下角，然后点击缩小...滚动区域不会更新，我留下了白色屏幕。

如果我然后单击屏幕一次，滚动区域会调整！

如何自动实现这一目标？

angular.module('ionicApp', ['ionic'])

.controller('MyCtrl', function($scope) {

  // get image-holder details
  $scope.imageHolderDetails = document.getElementById('img-holder').getBoundingClientRect();
  $scope.imageHolderWidth = $scope.imageHolderDetails.width;

  // get image
  $scope.image = document.getElementById('image');

  //set zoom amount to image-holder width x 2
  $scope.zoomAmount = $scope.imageHolderDetails.width * 2;

  // set the image to full width of image-holder
  $scope.image.style.width = $scope.imageHolderWidth + 'px';

  // zoom in
  $scope.zoomIn = function() {
    $scope.image.style.width = $scope.zoomAmount + 'px';
  }

  // reset zoom
  $scope.zoomOut = function() {
    $scope.image.style.width = $scope.imageHolderDetails.width + 'px';
  }

});

body {
  cursor: url('http://ionicframework.com/img/finger.png'), auto;
}

<html ng-app="ionicApp">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">

  <title>Ionic Template</title>

  <link href="//code.ionicframework.com/nightly/css/ionic.css" rel="stylesheet">
  <script src="//code.ionicframework.com/nightly/js/ionic.bundle.js"></script>
</head>

<body ng-controller="MyCtrl">
  <ion-header-bar class="bar-stable">
    <h1 class="title">Gummy bears anyone?</h1>
  </ion-header-bar>
  <ion-content id="img-holder" scroll="true" overflow-scroll="false" locking="false" direction="xy">
    <img id="image" src="https://static.pexels.com/photos/55825/gold-bear-gummi-bears-bear-yellow-55825.jpeg">
  </ion-content>
  <ion-footer-bar class="bar-royal">
    <a class="tab-item" ng-click="zoomOut()">
      <i class="icon ion-minus"></i>
    </a>
    <a class="tab-item" ng-click="zoomIn()">
      <i class="icon ion-plus"></i>
    </a>
  </ion-footer-bar>
</body>

</html>

Answer 1

您需要致电$ionicScrollDelegate.resize()

http://codepen.io/mhartington/pen/eZLZdx

Answer 2

这是我在Ionic使用手风琴时遇到的问题。我给出的建议是在您的操作后使用以下代码自动更新可滚动区域（放大或缩小后）：

BEGIN TRY
    BEGIN TRANSACTION CheckLogin 

        --Existing SQL code

    COMMIT TRANSACTION CheckLogin 
END TRY
BEGIN CATCH
    ROLLBACK TRANSACTION CheckLogin 
END CATCH

需要使用$timeout($ionicScrollDelegate.resize, 100);以确保正确调用$timeout。我发现使用值$scope.apply()来表示我的超时时间不够，并选择使用100毫秒。这也是我在Ionic论坛上发现的建议。您应该查看0及其相关指令，以获取更多信息。

在Ionic中动态更新滚动区域

2 个答案: