问题描述
我不知道我做错了什么!我只是想从Firebase数据库获取数据,并对每个结果进行迭代并将其放入数组中。我尝试了不同的方法。但是他们都返回一次一个结果到数组的结果。结果如下所示:[1]
/ pre>
[1,2]
[1,2,3]
[1,2,3,4]
你可以看到它每次迭代都会添加一个对象。
这里是我所拥有的:
$ $ p $ {code> let ref = FIRDatabase.database()。reference()。child(用户)
ref.observeEventType(.ChildAdded,withBlock:{snapshot in
userUrl = snapshot.value?[profile_image_1] as!String
imageArray.insert(userUrl,atIndex:0 )
},withCancelBlock:{
print(error.description)
})
我也试过这个:
$ b $ pre $ let userUrl =(snapshot.value.objectForKey(profile_image_1 ))as!字符串
imageArray.append(userUrl)
我只是想把每个结果放入一个数组
[1,2,3)我可以一次访问数据, ,4]
任何帮助都会很棒!
数据库:
尝试这样的事情:
<$ p $()code $ var $ image $ {
func appendData(){
let ref = FIRDatabase.database()。reference()。child(users)
$ b ref.observeEventType(.Value,withBlock:{snapshot in
var tempImageArray = []
用于snapshot.children中的用户{
userUrl = user.value?[profile_image_1] as?String
self.imageArray.insert(userUrl,atIndex:0)
tempImageArray.append(broadcastItem)
}
self.imageArray = tempImageArray
))
}
edit:I updated代码,请试试这个。
I don't know what I am doing wrong! I just simply want to take data from Firebase database and iterate for each result and put them into an array. I have tried serval different approaches. But they all return results adding one at a time to the array. Resulting in an array looking like this:
["1"]
["1","2"]
["1","2","3"]
["1","2","3","4"]
as you can see it adds one object each time it iterates.Here is what I have:
let ref = FIRDatabase.database().reference().child("users")
ref.observeEventType(.ChildAdded, withBlock: { snapshot in
userUrl = snapshot.value?["profile_image_1"] as! String
imageArray.insert(userUrl, atIndex: 0)
}, withCancelBlock: { error in
print(error.description)
})
and I have also tried this:
let userUrl = (snapshot.value.objectForKey("profile_image_1")) as! String
imageArray.append(userUrl)
I just want to put each result into an array I can access the data at once, outside of the completion block.
["1","2","3","4"]
Any help would be great!
Database:Firebase Database Structure
Try something like this:
var imageArray = []
func appendData(){
let ref = FIRDatabase.database().reference().child("users")
ref.observeEventType(.Value, withBlock: { snapshot in
var tempImageArray = []
for user in snapshot.children {
userUrl = user.value?["profile_image_1"] as? String
self.imageArray.insert(userUrl, atIndex: 0)
tempImageArray.append(broadcastItem)
}
self.imageArray = tempImageArray
})
}
edit: I updated the code, please try this.
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