鸿蒙next 实现试卷计时器
1.实现计时器 ui
@Entry
@Component
struct QuickTestMainPage {
@State paperAllTime: number = 0;
@State remainTimeUi: string = "00:00";
@State remainTime: number = 0;
build() {
Column() {
CustomIcon({
iconType: CustomIconType.icon_timer,
iconSize: 19,
iconColor: StyleRes.getStyleColor(StyleColor.textBoldColor, this.lightMode)
})
Text(this.remainTimeUi)
.fontColor(StyleRes.getStyleColor(StyleColor.texSubColor, this.lightMode))
.fontSize(11)
}
}
}
2.利用setTimeout 来实现没一秒执行一次。
@Entry
@Component
struct QuickTestMainPage {
@State paperAllTime: number = 0;
@State remainTimeUi: string = "00:00";
@State remainTime: number = 0;
aboutToAppear(): void {
this.timerInit()
}
timerInit() {
if (this.isTest) {
this.remainTime = this.paperAllTime - this.makeTime;
} else {
this.remainTime = this.makeTime;
}
this.remainTimeUi = Utils.formatSeconds(this.remainTime);
this.secondReturn();
}
secondReturn() {
this.doExamTimer = setTimeout(() => {
if (this.isTest) {
this.remainTime--;
this.remainTimeUi = Utils.formatSeconds(this.remainTime);
this.makeTime = this.paperAllTime - this.remainTime;
if (this.remainTime <= 0) {
return;
}
} else {
this.remainTime++;
this.remainTimeUi = Utils.formatSeconds(this.remainTime);
this.makeTime = this.remainTime;
}
this.secondReturn();
}, 1000)
}
build() {
Column() {
CustomIcon({
iconType: CustomIconType.icon_timer,
iconSize: 19,
iconColor: StyleRes.getStyleColor(StyleColor.textBoldColor, this.lightMode)
})
Text(this.remainTimeUi)
.fontColor(StyleRes.getStyleColor(StyleColor.texSubColor, this.lightMode))
.fontSize(11)
}
}
}
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