ios - 访问闭包之外的数据//iOS Swift
<p><p>如何在闭包之外访问“用户”？</p>
<pre><code> let currentUser = FIRDatabase.database().reference(withPath: "users").child((FIRAuth.auth()!.currentUser?.uid)!)
currentUser.observeSingleEvent(of: FIRDataEventType.value, with: { snapshot in
let value = snapshot.value as? NSDictionary
let name = value?["name"] as? String
let age = value?["age"] as? String
let user = UserStruct.init(name: name, age: age)
})
</code></pre>
<p>Firebase 中的一切都正确无误，并且数据存在且不为零。但我需要像这样在闭包之外引用“用户”:</p>
<pre><code>print(user.name)
print(user.age)
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>在闭包之外声明 <code>user</code> 变量，然后使用 <code>self</code> 修饰符访问它。</p>
<pre><code> var user: UserStruct
let currentUser = FIRDatabase.database().reference(withPath: "users").child((FIRAuth.auth()!.currentUser?.uid)!)
currentUser.observeSingleEvent(of: FIRDataEventType.value, with: { snapshot in
let value = snapshot.value as? NSDictionary
let name = value?["name"] as? String
let age = value?["age"] as? String
self.user = UserStruct.init(name: name, age: age)
})
</code></pre></p>
<p style="font-size: 20px;">关于ios - 访问闭包之外的数据//iOS Swift，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40917864/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40917864/
</a>
</p>
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