教程地址
在添加navigationBarItem時(shí),是這么寫(xiě)的:

.navigationBarItems(trailing:
PresentationButton(destination: ProfileHost()) {
Image(systemName: "person.crop.circle")
.imageScale(.large)
.accessibility(label: Text("User Profile"))
.padding()
}
)
按照上面的寫(xiě)法會(huì)有警告提示!

屏幕快照2019-06-24上午10.16.02.png

查看官方 完整版的demo,依舊有警告,改成下面的代碼就好了.

.navigationBarItems(trailing:
PresentationButton(
Image(systemName: "person.crop.circle")
.imageScale(.large)
.accessibility(label: Text("User Profile"))
.padding(),
destination: ProfileHost()))
}