ionic4 中不显示幻灯片
Posted
技术标签:
【中文标题】ionic4 中不显示幻灯片【英文标题】:Slides are not displayed in ionic4 【发布时间】:2020-05-24 06:50:40 【问题描述】:我正在将源代码从 ionic3 迁移到 ionic4。 以下幻灯片页面在ionic4中不显示。 我该如何解决? 希望你能告诉我。
(附加信息) 我认为,这似乎是样式有问题,它出现在其他地方。 所以,我也会向 SCSS 添加信息。 为什么我不能像在 ionic4 中那样使用 ionic3 样式?
(更多信息) 如果我注释掉所有 walkthrough.page.scss,图像将出现在模态框的一部分中。Current status of the target screen
app.component.ts(调用页面)
...
async error =>
const walkthroughModal = await this.modalCtrl.create(component: WalkthroughPage, componentProps:prev_page: 'login' );
await walkthroughModal.present();
...
walkthrough.page.ts
@Component(
selector: 'page-walkthrough',
templateUrl: 'walkthrough.page.html',
styleUrls: ['walkthrough.page.scss'],
providers: [CustomNativeStorage]
)
export class WalkthroughPage
...
@ViewChild('slides', static: false) slides: IonSlides;
...
walkthrough.page.html
<ion-slides pager="true">
<ion-slide *ngFor="let slide of walkthroughSlides" [style.background-image]="slide.img">
<div class="walkthrough-content-card">
<div class="text-container">
<div class="walkthrough-title">
slide.title
</div>
<div class="walkthough-text">
slide.text
</div>
</div>
<div class="button-container">
<ion-button class="button_continue" color="bright" (click)="slideNext()">
CONTINUE
</ion-button>
</div>
</div>
</ion-slide>
</ion-slides>
walkthrough.page.scss
$iphone4: "(device-width: 320px) and (device-height: 480px)";
$iphone5: "(device-width: 320px) and (device-height: 568px)";
$iphone6_7: "(device-width: 375px) and (device-height: 667px)";
.ios,
.md
.swiper-slide.swiper-slide-active
width: 100% !important;
ion-slide
background-size: cover;
background-position: top center;
.walkthrough-content-card
background-color: rgba(255,255,255,0.85);
position: absolute;
width: 100%;
bottom: 0px;
.text-container
padding: 5%;
.walkthrough-title
font-size: 1.6rem;
font-weight: bold;
margin-bottom: 10px;
.walkthough-text
font-size: 1.5rem;
margin-bottom: 30px;
.button-container
width: 100%;
text-align: center;
margin-bottom: 15px;
.button_continue
min-width: 50%;
@extend .remove-text-transform,
.remove-button-curves !optional;
.swiper-pagination-fraction, .swiper-pagination-custom,
.swiper-container-horizontal > .swiper-pagination-bullets
bottom: 10%;
.swiper-pagination-bullet-active
background: #FF9800;
.slide-zoom
height: 100% !important;
@media #$iphone4
.swiper-pagination-fraction, .swiper-pagination-custom,
.swiper-container-horizontal > .swiper-pagination-bullets
bottom: 14.5% !important;
@media #$iphone5
.swiper-pagination-fraction, .swiper-pagination-custom,
.swiper-container-horizontal > .swiper-pagination-bullets
bottom: 11.5% !important;
@media #$iphone6_7
.swiper-pagination-fraction, .swiper-pagination-custom,
.swiper-container-horizontal > .swiper-pagination-bullets
bottom: 10% !important;
global.scss
/* Core CSS required for Ionic components to work properly */
@import "~@ionic/angular/css/core.css";
/* Basic CSS for apps built with Ionic */
@import "~@ionic/angular/css/normalize.css";
@import "~@ionic/angular/css/structure.css";
@import "~@ionic/angular/css/typography.css";
@import '~@ionic/angular/css/display.css';
/* Optional CSS utils that can be commented out */
@import "~@ionic/angular/css/padding.css";
@import "~@ionic/angular/css/float-elements.css";
@import "~@ionic/angular/css/text-alignment.css";
@import "~@ionic/angular/css/text-transformation.css";
@import "~@ionic/angular/css/flex-utils.css";
//Universal Styles
.ios .japanese-fonts
font-family: "Hiragino Sans", "HiraKakuProN", sans-serif !important;
.md .japanese-fonts
font-family: "Noto Sans CJK", "モトヤフォント", sans-serif !important;
.ios,
.md
body
padding-top: constant(safe-area-inset-top);
padding-right: constant(safe-area-inset-right);
padding-bottom: constant(safe-area-inset-bottom);
padding-left: constant(safe-area-inset-left);
padding-top: env(safe-area-inset-top);
padding-right: env(safe-area-inset-right);
padding-bottom: env(safe-area-inset-bottom);
padding-left: env(safe-area-inset-left);
.title-center
position: absolute;
top: 0;
left: 0;
padding: 0 90px 1px;
width: 100%;
height: 100%;
text-align: center;
.back-button-style
z-index: 10;
margin-left: 5px;
padding-left: 0px;
.remove-button-curves
border-radius: 0px;
.remove-text-transform
text-transform: none;
.remove-box-shadow
box-shadow: none;
.explanation-text
width: 100%;
font-size: 18px;
text-align: center;
padding: 20px 40px;
color: var(--ion-color-text_gray);
::-webkit-scrollbar,
*::-webkit-scrollbar
display: none;
.tabs-md[tabsHighlight="true"] .tab-highlight
background-color: #4FC3F7 !important;
.tab-badge
background-color: #FF4141 !important;
.loading-wrapper
background: transparent !important;
position: relative !important;
bottom: 10%;
ion-backdrop
opacity: 0.7 !important;
.custom-spinner-box
text-align: center;
.loading-wrapper
color: white !important;
.custom-spinner-font
color: white !important;
font-size: 1.8rem;
text-align: center;
top: 0;
position: relative;
【问题讨论】:
你能分享一下walkthroughSlides数据吗 谢谢,我添加了 walkthrough.page.scss。 不客气。 我可以帮忙。但什么是查询? 我想显示上述源代码的幻灯片页面(walkthrough.page.html),但是不行。 【参考方案1】:当使用ViewChild
监控更改时,您需要通过在 ion-slides 元素上添加对它的模板引用来连接您在 .ts 文件中声明的 slides 变量,如下所示:
<ion-slides pager="true" #slides>
// the slides
</ion-slides>
结帐The ViewChild Angular docs 了解更多信息。
【讨论】:
请您回复。但这行不通。它只是显示一个白色模态。 原因似乎是 CSS。看来ionic3的风格没用。我该怎么办。 啊,在那种情况下,我认为错误在于您已经声明了特定的样式来覆盖 Ionic 生成的类名,但是您需要将这些样式放在全局 variables.scss 文件中生效。可以试试吗? 感谢您的回答。我很高兴,因为我很烦恼。我应该将特定样式从 walkthrough.page.scss 移动到 global.scss 吗?我还在上述问题正文中添加了 global.scss。 根据我的经验,我需要将任何 Ionic 特定的类名移动到 global.scss。例如,您应该能够使用本地 .scss 文件中的ion-slide
选择器和 Ionic 提供的 CSS 自定义选项(请参阅 this page)进行样式设置,但需要将 .swiper-pagination-bullet-active
之类的内容移动到 global.scss跨度>
以上是关于ionic4 中不显示幻灯片的主要内容,如果未能解决你的问题,请参考以下文章
IONIC 4:“ionic cordova build ios”不显示使用 Xcode 10.1 构建失败或成功
firebase-x@ionic 4 不显示推送消息(FCM)
Ionic4 watchPosition 和 getCurrentPosition 的地理位置与 Ionic/Capacitor 不准确