Ionic4--loading异步加载，导致无法正确消失

原文出处：https://blog.csdn.net/fn512613/article/details/103693603/

原因：由于异步导致dissmiss()方法先走，然后才执行present()方法

在stackoverflow上找到了比较好的解决办法  

public loadingIsOpen: any = false; loading加载 async show() { this.loadingIsOpen = true; return await this.loadingController.create({ duration: 7000, }).then(a => { a.present().then(() => { if (!this.loadingIsOpen) { a.dismiss() } }); }); } loading结束 async hide() { if (this.loadingIsOpen == true) { this.loadingIsOpen = false; return await this.loadingController.dismiss(); } }