Question

只需更新我的可可豆荚，即可更新火力库。这行代码是旧方法，现在是错误的：

import tensorflow as tf

def method(i):
    # Placeholder logic
    return tf.cast(tf.range(i, i + 100), tf.float32)

def condition(i, var):
    return tf.less(i, 100)

def body(i, var):
    # Produce new row
    updated_row = method(i)
    # Index vector that is 1 only on the row to update
    idx = tf.equal(tf.range(tf.shape(a)[0]), i)
    idx = tf.cast(idx[:, tf.newaxis], var.dtype)
    # Compose the new tensor with the old one and the new row
    var_updated = (1 - idx) * var + idx * updated_row
    return [tf.add(i, 1), var_updated]

# Start with zeros
a = tf.zeros([100, 100], tf.float32)
i = tf.constant(0)
i_end, a_updated = tf.while_loop(condition, body, [i, a], parallel_iterations=10)

with tf.Session() as sess:
    print(sess.run(a_updated))

下面的代码是现在提取URL字符串的正确方法。但是，我需要有关如何将该字符串放入数组以保存到Firebase的帮助。

[[  0.   1.   2. ...  97.  98.  99.]
 [  1.   2.   3. ...  98.  99. 100.]
 [  2.   3.   4. ...  99. 100. 101.]
 ...
 [ 97.  98.  99. ... 194. 195. 196.]
 [ 98.  99. 100. ... 195. 196. 197.]
 [ 99. 100. 101. ... 196. 197. 198.]]

我如何将“值”保存为孩子

let downloadURL = metaData!.downloadURL()!.absoluteString
let values: Dictionary<String, Any> = ["download_url": downloadURL]

使用下面的答案...

当我使用下面提交的答案时，我得到一个打印输出，说“用户无权访问gs：//shoppeer-e7270.appspot.com/（null）”。我要完成的所有工作就是获取该URL字符串并将其添加到我的“值”（即字典）中。

我用于图像上传和保存为孩子的完整代码

storageRef.downloadURL(completion: {(url, error) in
    if error != nil {
     print(error!.localizedDescription)
       return
    }
    let downloadURL = url?.absoluteString

})

let values: Dictionary<String, Any> = ["download_url": downloadURL]

此功能仅适用于下载URL字符串为空

let databaseRef = Database.database().reference()
let path = databaseRef.child("posts").child((self.loggedInUser?.uid)!).childByAutoId()
path.setValue(values) { (error, ref) -> Void in
    if error != nil {
        print("error saving post in db")
    } else {
        let storageRef = Storage.storage().reference().child("posts_requests").child((self.loggedInUser?.uid)!).child(snapshot.childSnapshot(forPath: "uid").value as! String).child(snapshot.childSnapshot(forPath: "uid").value as! String).child(snapshot.childSnapshot(forPath: "imageID").value as! String)
        storageRef.delete(completion: { error in
            if let error = error {
                print(error)
            } else {
                print("Successful Delete")
            }
        })

    }
}

Answer 1

values是Dictionary，而不是Array，但是如果要向其中添加downloadURL，则需要在的完成处理程序中进行storageRef.downloadURL(completion:)，因为这是异步方法。

storageRef.downloadURL(completion: {(url, error) in
    if error != nil {
     print(error!.localizedDescription)
       return
    }
    let downloadURL = url?.absoluteString
    let values: Dictionary<String, Any> = ["download_url": downloadURL]
})

Answer 2

下载URL仅在完成处理程序内部可用。

storageRef.downloadURL(completion: {(url, error) in
    if error != nil {
     print(error!.localizedDescription)
       return
    }
    let downloadURL = url?.absoluteString
    let values: Dictionary<String, Any> = ["download_url": downloadURL]

    let databaseRef = Database.database().reference()
    let path = databaseRef.child("posts").child((self.loggedInUser?.uid)!).childByAutoId()
    path.setValue(values) { (error, ref) -> Void in
        ...

Swift Firebase metaData！.downloadURL（）!. absoluteString

2 个答案: