Question

编辑：在iOS 12.4.6上，它仍然不起作用，但至少该条不再跳动，但仍未注册值，或者未取消设置为20％的预设值。在iOS 13.3.1（我的另一部手机）上，所有描述的问题都会重现

我的Web应用程序中有一个垫块滑块，用于控制在后台运行的视频的音量。

在iOS（Safari / Chrome）上，用户将视频取消静音后跳到20％（跳到100％但未注册值，但仍然听到20％）时，它不尊重我的任何实现。

如果我尝试滑动到任何值，它会自动跳回100％。使用Taps（不滑动）而不是滑动，它会停留在该位置上，但不会注册该值（音量保持不变）。

在Android设备/台式机上，它可以按照我的意愿运行。

package.json

{
  "name": "taraful-turnenii-web-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --host 192.168.1.2",
    "build": "ng build",
    "build-prod" : "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^9.1.2",
    "@angular/cdk": "^9.2.1",
    "@angular/common": "~9.1.1",
    "@angular/compiler": "~9.1.1",
    "@angular/core": "~9.1.1",
    "@angular/forms": "~9.1.1",
    "@angular/material": "^9.2.1",
    "@angular/platform-browser": "~9.1.1",
    "@angular/platform-browser-dynamic": "~9.1.1",
    "@angular/router": "~9.1.1",
    "bootstrap": "^4.4.1",
    "hammerjs": "^2.0.8",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.901.1",
    "@angular/cli": "~9.1.1",
    "@angular/compiler-cli": "~9.1.1",
    "@angular/flex-layout": "^9.0.0-beta.29",
    "@angular/language-service": "~9.1.1",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.11.1",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.4.1",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~2.1.0",
    "karma-jasmine": "~3.0.1",
    "karma-jasmine-html-reporter": "^1.4.2",
    "protractor": "~5.4.3",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~3.8.3"
  }
}

CLI

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 9.1.1
Node: 13.13.0
OS: win32 x64

Angular: 9.1.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.901.1
@angular-devkit/build-optimizer   0.901.1
@angular-devkit/build-webpack     0.901.1
@angular-devkit/core              9.1.1
@angular-devkit/schematics        9.1.1
@angular/cdk                      9.2.1
@angular/cli                      9.1.1
@angular/flex-layout              9.0.0-beta.29
@angular/material                 9.2.1
@ngtools/webpack                  9.1.1
@schematics/angular               9.1.1
@schematics/update                0.901.1
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

mat-slider的HTML代码：

<mat-slider class="matSlider" 
  [value]="matBarValue"
  (input)="videoElement.volume = $event.value"
  (change)="changeBtnIcoWithSlider(videoElement, muteBtn)" tickInterval="0.01" step="0.01" min="0" max="1"></mat-slider>

CSS：

.mat-slider {
  position: relative;
  float: left;
  left: 0;
  right: 0;
  width: 17vw;
}

@media(max-width: 397px) {

  .mat-slider {
    margin-top: 3px;
    width: 200px;
  }
}

@media(max-width: 768px) {

  .mat-slider {
    margin-top: 3px;
    width: 77vw;
  }

}

在滑块内调用的TS代码

changeBtnIcoWithSlider(videoElement, muteBtn: HTMLButtonElement) {
    if (videoElement.volume > 0) {
      videoElement.muted = false;
      this.matBarValue = videoElement.volume;
      muteBtn.innerHTML = 'Mute Video'
      this.imageSrc = 'assets/VolIcon.png';
    } else {
      muteBtn.innerHTML = 'Unmute Video';
      this.imageSrc = 'assets/MuteIcon.png';
      videoElement.muted = true;
    }
  }

我尝试的方法：添加Hammerjs，但是我读到对于该版本的angular并不是强制性的，以便使mat-slider与手势识别一起工作（它在android上工作。

将导入的mat滑块模块放置在BrowserAnimationsModule和BrowserModule之后，也位于它们之间或之上，因为我看到这些命令对其他人有帮助。

什么都没有。

谢谢。

Answer 1

好吧

似乎在iOS上您无法通过JS / TS设置音量属性，并且正如Apple文档所说：

On iOS devices, the audio level is always under the user’s physical control. The volume property is not settable in JavaScript. Reading the volume property always returns 1.

https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html#//apple_ref/doc/uid/TP40009523-CH5-SW11

Angular 9 Mat-Slider在iOS设备上无法正常工作

1 个答案: