我已经用ionic 4和cordova构建了一个应用程序。在 android 上，该应用程序运行起来很有魅力，但在 iOS 上，我遇到了一些奇怪的问题……就像其他人一样（Ionic IOS 应用程序 NSURLConnection 错误 1100，ionic 4 应用程序在 ios 上显示白屏，错误代码为 1100）。应用程序 ionic 构建运行良好，没有任何错误，只有一些未使用导入的警告。此外，xcode 构建快速且成功。但是当应用程序在真实设备或模拟器上运行时，我只会看到一个空白的白屏。在控制台中，我通过额外的调试得到了这个：
我发现 like 提到了一些类似的问题，并且还添加了环境变量 ( CFNETWORK_DIAGNOSTICS = 1) 以进行高级网络日志记录以在控制台中获取更多信息（整个文件：https : //pastebin.com/yecJ5Vzy）或这里的一些片段：
2019-05-03 10:59:49.788736+0200 MyNiceApp[3426:1312031] CFNetwork Diagnostics [1:1] 10:59:49.787 {
DiskCookieStorage Construction: Binary{ Disk Cookies: { /private/var/mobile/Containers/Data/Application/23CCB045-0976-4DD0-A19B-0BD8CB6825FD/Library/Cookies/Cookies.binarycookies, <0 cookies in 0 domains> clean not writing } }
Accessing: <CFURL 0x282db3c60 [0x1bda5d610]>{string = file:///private/var/mobile/Containers/Data/Application/13371337-0976-4DD0-A19B-0BD8CXYZAS/Library/Cookies/Cookies.binarycookies, encoding = 13371337, base = (null)}
Path: /private/var/mobile/Containers/Data/Application/13371337-0976-4DD0-A19B-0BD8CXYZAS/Library/Cookies/Cookies.binarycookies
Read from disk: <0 cookies …我有一个结构如下的数据框：
Coumn1 Coumn2
0 (0.00030271668219938874, 0.0002655923890415579... (0.0016430083196610212, 0.0014970217598602176,...
1 (0.00015607803652528673, 0.0001314736582571640... (0.0022136708721518517, 0.0014974646037444472,...
2 (0.011317798867821693, 0.011339936405420303, 0... (0.004868391435593367, 0.004406007472425699, 0...
3 (3.94578673876822e-05, 3.075833956245333e-05, ... (0.0075020878575742245, 0.0096737677231431, 0....
4 (0.0004926157998852432, 0.0003811710048466921,... (0.010351942852139473, 0.008231297135353088, 0...
.. ... ...
130 (0.011190211400389671, 0.011337820440530777, 0... (0.010182800702750683, 0.011351295746862888, 0...
131 (0.006286659277975559, 0.007315031252801418, 0... (0.02104150503873825, 0.02531484328210354, 0.0...
132 (0.0022791570518165827, 0.0025983047671616077,... (0.008847278542816639, 0.009222050197422504, 0...
133 (0.0007059817435219884, 0.0009831463685259223,... (0.0028264704160392284, 0.0029402063228189945,...
134 (0.0018992726691067219, 0.002058899961411953, ... (0.0019639385864138603, 0.002009353833273053, ...
[135 rows x 2 columns]
其中每个单元格保存一些浮点值的列表/元组：
type(psd_res.data_frame['Column1'][0])
<class 'tuple'>
type(psd_res.data_frame['Column1'][0][0])
<class 'numpy.float64'> …