Xcode 11，迅捷.Dateformatter总是返回nil [英] Xcode 11, swift. Dateformatter always return nil

问题描述

在Swift中将值从 String 转换为 Date 时遇到问题.

它总是返回nil.我在做什么错了?

 让dateFormatter = DateFormatter()dateFormatter.dateFormat ="yyyy-MM-dd"let date = dateFormatter.date(来自:"2019-05-03") 

这是Xcode调试器中发生的事情

解决方案

更新:

这似乎是Xcode中的错误.在 viewDidLoad 中尝试代码并设置断点会导致日期的 lldb 描述为 nil ，但是可以正确打印出期望值

您可以在此

I have a problem with converting value from String to Date in Swift.

It always returns nil. What am I doing wrong?

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let date = dateFormatter.date(from: "2019-05-03")

Here is what is happening in the debugger in Xcode

解决方案

Update:

It would appear that it is a bug in Xcode. Trying your code in the viewDidLoad and setting a breakpoint causes the lldb description of the date to be nil, however it correctly prints the expected value out.

You can see more about the bug at this SO post, thanks to OOPer for the link.

Currently this bug is still occurring in Xcode 11.2-beta

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A couple of points

Use .dateFormat instead of .format

Use the correct quotation marks " instead of ", also you should remove the space from your date format string.

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let date = dateFormatter.date(from: "2019-05-03")

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