目前问题，首次点击后，弹窗有打开，但是弹窗里没有渲染内容，关闭后打开其它卡片可正常显示。。。
简化代码如下：
@State private var showStudentDetail: Bool = false
@State private var studentDetail: Student?
...
VStack(alignment: .leading, spacing: 12) {
ForEach(students) { student in
CardView(student: student)
.onTapGesture {
studentDetail = student
showStudentDetail.toggle()
}
}
.sheet(isPresented: $showStudentDetail) {
if let studentDetail = studentDetail {
StudentDetailView(student: studentDetail)
}
}
}
