即使iphone中的应用程序处于后台，如何在Apple手表伴侣应用程序中获取连续数据

Question

我正在为xamarin表单项目开发Apple watch伴侣应用程序。当iPhone应用程序或父应用程序处于后台时，我无法从父应用程序获取连续数据到我的配套应用程序。我在app委托中使用了以下代码的和平，但由于iOS后台时间限制为10分钟，因此也会在一定时间后停止发送数据。 有些机构可以建议，即使父应用程序处于后台，也可以从父应用程序连续获取数据的正确方法。

# I generate some fake data to mimic your problem
set.seed(125)
library(igraph)

# fake df1
df1 <- data.frame(ID = 1:9, dept = rep(LETTERS[1:3], 3), stringsAsFactors = F)
df1
#>   ID dept
#> 1  1    A
#> 2  2    B
#> 3  3    C
#> 4  4    A
#> 5  5    B
#> 6  6    C
#> 7  7    A
#> 8  8    B
#> 9  9    C

# fake df2
df2 <- data.frame(sender = sample(1:9, 6, replace = T), receiver = sample(1:9, 6, replace = T))
df2
#>   sender receiver
#> 1      8        5
#> 2      2        3
#> 3      3        6
#> 4      4        6
#> 5      9        1
#> 6      9        7

# the graph
g <- graph_from_data_frame(df2)

# You can get your general approach to work
# if the department codes are a named vector,
# where the names are the IDs. If this is the case
# a call like dept[c(ID1, ID3, ID2)] will ouput the
# department of individual 1, 3 and 2 in that order
named.dept <- df1$dept
names(named.dept) <- df1$ID

# To see how it works
named.dept[df2$sender]
#>   8   2   3   4   9   9 
#> "B" "B" "C" "A" "C" "C"

# Now using your code
E(g)$internal <- as.numeric(named.dept[df2$sender] == named.dept[df2$receiver])
E(g)$internal
#> [1] 1 0 1 0 0 0