Live Preview not working

Bug Reports
1

I’m using FuseTools version 1.0.1 (build 13566) on the latest generation MBP running OSX Sierra version 10.12.5.

Last week, I was able to export a build via $fuse build --target=ios --run to load the Fuse app into XCode. After this I was able to click the “Play” button within XCode and got the app to run, even after disconnecting the USB-C cable. The app was nice and fast.

Today, I updated code and wanted to test a new build on phone but ran into foreign looking errors shown below. For reference, my Fuse app still runs fine in preview mode. Here’s my CLI audit trail.

$fuse build --target=ios --run
Uno 1.0.12 (build 5387) OS X 10.12 i386 620e8e3
Configuring
Target is up-to-date -- stopping build (pass --force to override)
Build completed in 0.19 seconds
---
[....] Waiting for iOS device to be connected
[....] Using f455d27bf08dddee6f8b9173310d02e9a18c4daa (D11AP, iPhone 7 Plus, iphoneos, arm64) a.k.a. 'CALVIN’s iPhone7 Plus'.
------ Install phase ------
[  0%] Found f455d27bf08dddee6f8b9173310d02e9a18c4daa (D11AP, iPhone 7 Plus, iphoneos, arm64) a.k.a. 'CALVIN’s iPhone7 Plus' connected through USB, beginning install
[  5%] Copying /Users/calvinnguyen/safezone/projects/mobile/fuse/samples/instafit/build/iOS/Debug/build/Release-iphoneos/instafit.app/META-INF/ to device
...
<Then the errors>
[100%] Installed package build/Release-iphoneos/instafit.app
------ Debug phase ------
Starting debug of f455d27bf08dddee6f8b9173310d02e9a18c4daa (D11AP, iPhone 7 Plus, iphoneos, arm64) a.k.a. 'CALVIN’s iPhone7 Plus' connected through USB...
[  0%] Looking up developer disk image
[ 95%] Developer disk image mounted successfully
[100%] Connecting to remote debug server
-------------------------
(lldb) command source -s 0 '/tmp/7C13992A-4974-499B-886F-677CA47FF008/fruitstrap-lldb-prep-cmds-f455d27bf08dddee6f8b9173310d02e9a18c4daa'
Executing commands in '/tmp/7C13992A-4974-499B-886F-677CA47FF008/fruitstrap-lldb-prep-cmds-f455d27bf08dddee6f8b9173310d02e9a18c4daa'.
(lldb)     platform select remote-ios --sysroot '/Users/calvinnguyen/Library/Developer/Xcode/iOS DeviceSupport/10.3.2 (14F89)/Symbols'
  Platform: remote-ios
 Connected: no
  SDK Path: "/Users/calvinnguyen/Library/Developer/Xcode/iOS DeviceSupport/10.3.2 (14F89)/Symbols"
(lldb)     target create "/Users/calvinnguyen/safezone/projects/mobile/fuse/samples/instafit/build/iOS/Debug/build/Release-iphoneos/instafit.app"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 98, in <module>
    import six
ImportError: No module named six
...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'run_one_line' is not defined
error: python failed attempting to evaluate 'fruitstrap_device_app="/private/var/containers/Bundle/Application/B8940E1C-02BA-4545-B114-AB098831CC4E/fit4l.app"'

I’ve waited up to 10+ minutes and ultimately CTRL+C to to exit after 10+minutes of stalled output. I’m searched the forums and google but feel stuck and would appreciate insight on what I’ve done wrong and how I might fix the error.

2

Hi Calvin,

when you add -r to the build command, Fuse tries to install and run the app directly on connected USB device(s). If you run fuse build --help you will find that you can open XCode by supplying a -d argument.

So, to start a preview (that does live update), you run: fuse preview -tios.

And to make a release build (that opens in XCode), you run: fuse build -tios -d -cRelease

Optionally, you can add -DCOCOAPODS flag to both commands if you’re using any third party frameworks on your iOS build.

Hope this helps!

3

Hi Uldis. Sorry about the erroneous title with my post that may have confused matters. I appreciate the the summary and those additional CLI switches. Let me try to clarify. I’m able to successfully build when I remove the -r/–run switch from the fuse build -tiOS -r but receive this error if I include it.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'run_one_line' is not defined
error: python failed attempting to evaluate 'fruitstrap_device_app="/private/var/containers/Bundle/Application/B8940E1C-02BA-4545-B114-AB098831CC4E/fit4l.app"'

Any ideas on why I might get this following error and do I lose anything by omitting -r or is it just handy switch to run the app after the build has been built and installed?

4

Not sure where the error comes from, but the internet says that it’s probably not directly related to Fuse, but rather your system. See this for an example and do a google search on the error, you might find a solution somewhere.

As for the flag itself, using -r does just that: bypasses opening an IDE (Android Studio or XCode, depending on the target platform), and installs the app right onto a connected device. So, no, you don’t lose anything if you can still open an IDE and run the preview/build from there.