objective c iphone : can we view console log on device

Question

is there a way to view the console output as we are running an iphone App on the device? If not directly, is there an app on the App store which lets you view the log after the App has finished running?

Solution 1

Update to use Xcode 12.5.1 and Console 1.1:

In Xcode go to Window->Devices and Simulators, select your device and press on "Open Console" button.

Or directly open Console by pressing cmd+space -> type "Console" and press enter.

In the Console app select your device from left pane and press on "Start streaming".

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You can also see in Devices window.

Go in xcode -> Window -> Devices.

Select your device and open the console.

Solution 2

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *fileName =[NSString stringWithFormat:@"%@.log",[NSDate date]];

NSString *logFilePath = [documentsDirectory stringByAppendingPathComponent:fileName];

freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);

Just add this block of code in applicationdidFinishLaunchingWithOptionslaunchOptions method in app delegate file, and it will create a log file in app Document Directory on iphone which logs all console log events. You need to import this file from itunes to see all console events.

Dont Forget to set "Application supports iTunes file sharing" to "YES" in Your plist

Goto - itunes -when ur device connected-Apps - select ur App - in Augument Document u will get ur file then save to ur disk

Solution 3

if you have a paid iphone developer account, you can use the organizer window in xcode to view the console and app logs on your devices.

Comments

[user315067]

oh no thats not the issue ... I am developing a Location Based application, for which I need to run with my iphone. Its a little cumbersome to run with my macbook in one hand and iphone in the other. Any "on device log viewer"?

[Jorge Cohen]

you could make your app NSLog the data you want to see and view it later using the organizer. i think there's no way to see it live on-device unless you add you own ui to print it out.

[prabhu]

thanks, but I am unable to find the app document directory, can you please help me to find that .log file to import from iTunes

[Slipp D. Thompson]

-1 Does not answer the question. OP is asking to view the console's contents on-device; this answer uses a development computer with Xcode.

[Slipp D. Thompson]

-1 Does not answer the question OP is asking to view the console's contents on-device; this approach uses a development computer with Xcode.

[Robert Wasmann]

Seems with iTunes 12 we can't import files from the document directory anymore. Now everything is iCloud. How can users get this log file?

[ToddB]

Where is this in Xcode 6?

[MujtabaFR]

in Xcode 6 -> Window -> Devices -> Select the device -> a little arrow /\ at the bottom left, Click this and it will pop open the device console.

[Karoly Nyisztor]

Get [iSyslog][1]. Works also on iOS7 and iOS8. Runs natively on any device (iPhone, iPod Touch, iPad). No jailbreaking required. [1]: itunes.apple.com/us/app/isyslog-system-monitoring/…

[goelectric]

Works fine for me with Xcode 7.3 and iTunes 12.3.3.17