我正在使用Firebase设置登录页面，我遇到了一个错误，uid无法识别。这是我的代码：
FIRAuth.auth()?.createUser(withEmail: email, password: password, completion: { (FIRUser,error) in
if error != nil {
print(error)
return
}
guard let uid = user?.uid else {
return
}
我也无法命令点击进入FIRUser，但是如果我摆脱了保护声明，身份验证就可以正常运行。
我已导入Firebase和FirebaseDatabase（无法导入FirebaseAuth，它已被删除），所以不是这样。
知道为什么我无法访问FIRUser并使用uid？
答案 0 :(得分：1)
您需要在闭包中创建变量import time
import json
import string
import numpy as np
############################# GENERATE RANDOM DATA #############################
#letters = list(string.ascii_lowercase)
#random_data = ["""{"price": %d, "owner": "%s"}""" % (np.random.randint(1, 1000),
# ''.join(np.random.choice(letters, 6, replace=False))) for x
# in xrange(1000000)]
#
#with open('pseudo_json.txt', 'w') as outfile:
# for line in random_data:
# outfile.write(str(line) +'\n')
time1 = time.time()
#################################### METHOD 1 ##################################
running_max = 0
with open('pseudo_json.txt', 'r') as infile:
for line in infile:
price = json.loads(line)['price']
if price > running_max:
running_max = price
time2 = time.time()
#################################### METHOD 2 ##################################
with open("pseudo_json.txt", 'r') as f:
allcontent = []
for line in f:
allcontent.append(json.loads(line))
the_max = (max(allcontent, key=lambda x: x['price']))
time3 = time.time()
##################################### METHOD 3 ##############################
the_max = 0
with open("pseudo_json.txt", 'r') as f:
the_max = (max(f, key=lambda x: json.loads(x)['price']))
time4 = time.time()
#################################### ORIGINAL ##################################
with open("pseudo_json.txt", 'r') as infile:
allcontent = []
for line in infile:
allcontent.append(json.loads(line))
values = []
for line in allcontent:
for key,value in line.items():
values.append(value)
the_max = max(values)
time5 = time.time()
################################# READING FILE #################################
with open("pseudo_json.txt", 'r') as infile:
for line in infile:
pass
time6 = time.time()
################################### RESULTS ####################################
print "Without storage and max took: {}".format(time2 - time1)
print "With storage and using max took: {}".format(time3-time2)
print "Without storage but using max took: {}".format(time4 - time3)
print "Original took: {}".format(time5 - time4)
print "Reading file took: {}".format(time6 - time5)
。改为将此功能重写为此。
user