问题描述

如图

NG01052: formGroup expects a FormGroup instance. Please pass one in.

原因分析：

已经初始化了却还是报错

最后发现是视图加载成功，而Control没有加载成功

解决方案：

将初始化语句放前面即可

async ngOnInit(): Promise<void> {this.validateForm = this.fb.group({userName: [null, [Validators.required]],});this.route.queryParams.subscribe((data) => {this.routeData=JSON.parse(data['jsonStr'])})console.log(this.routeData);this.listFormUIField = await this.mService.getUIObject(this.routeData.CLASSNAME$, "Detail");this.listFormUIField.forEach((u:any)=> {this.validateForm.addControl(u.FIELDNAME,this.fb.control(this.getDisplayValue(u.FIELDNAME,this.routeData),Validators.required))});}