After converting over to Swift 3, my AWS iOS App now crashes when being run.
Has anyone seen anything similar after converting over to Swift 3?
Its crashing because you are doing a few things here:
trying to return a method call (which I don't think is possible - but I've never tried it)
application: didFinishLaunching should only ever return true because it's a boolean function as the name suggests. So the return value should be true. If you'd like to override application: didFinishLaunching you can declare that later in your AppDelegate
So here's what you can do... Try deleting the method and slowly type it back until Xcode auto-completes it for you. That will allow you to see what has been depreciated, or what other methods might be useful, also if you haven't yet hit Command + Shift + K to run a clean on your project. Xcode 8 and Swift 3 might have altered a few more things you aren't aware of.
launchOptions is an optional parameter. Doing a forced unwrap with the ! will crash if the value is nil, which it usually is.
Related
I'm fairly new to dtrace. I'm using it on Oracle Linux 7.
I want the following probe only to fire when the execname equals a defined string. I've tried different ways without success. The way described in most tutorials didn't work
syscall::write*:entry
/execname=="dtrace"/
{
...
This doesn't work.
But the other way around works
syscall::write*:entry
/execname!="dtrace"/
{
...
Now the probe fires for every execname except "dtrace"
What's my mistake?
I don’t know how but a reboot fixed the problem...
I have updated my xcode 8 and running an old app which has been created in 7.3 by convering the swift codes in swift 3. But I am getting the message in log window as below:
objc[19295]: Class PLBuildVersion is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x118365910) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x11818f210). One of the two will be used. Which one is undefined.
activity started
why its happening ?
You have a class PLBuildVersion declared in your framework AssetsLibraryServices as well as in PhotoLibraryServices. Because class names are unique Xcode tells you that it will take one of those class declarations, but that it'll keep it a surprise, which one that is. ;)
Luckily, you don't have to be concerned because both classes should be the same.
After the Swift 3 update, I'm having some trouble getting my app to compile. Most of the errors are pretty simple to fix, but I'm running into a few in particular with AWS. Is there some sort of updated AWS SDK for Swift 3? I've tried to look it up, but haven't found one. In any case, the two main errors I'm having trouble resolving are as follows:
"Type 'IdentityProviderManager' does not conform to protocol AWSIdentityProviderManager." This is for a class I created following a tutorial to set up logins through AWS Cognito. The code is:
class IdentityProviderManager: NSObject, AWSIdentityProviderManager{
var tokens : [NSString : NSString]?
init(tokens: [NSString : NSString]) {
self.tokens = tokens
}
#objc func logins() -> AWSTask<AnyObject> {
return AWSTask(result: tokens as AnyObject)
}
}
In the AWS documentation for AWSIdentityProviderManager, it says that the only required function is logins, which I have. Is there a simple way to resolve this that I'm missing?
The other error is in my LoginViewController class: "Type 'LoginViewController' does not conform to protocol 'AWSCognitoIdentityPasswordAuthentication'." Here the issue seems a bit more clear, since the documentation says that getPasswordAuthenticationDetails() is a required method and XCode seems to have changed this method to getDetails() when updating to Swift 3, unless I'm mistaken and it wasn't there to begin with or something. In any case, autocomplete doesn't give me the original method and I can't seem to make the class conform to the protocol.
Apologies if the answer is already in documentation somewhere, but as far as I can tell it seems like the AWS SDK (at least the version that I have) is somehow incompatible with Swift 3. Is there something I can do to resolve these errors?
Nevermind, it turned out XCode just wasn't showing me the option to make the changes I needed. The automatic fix implemented slightly different versions of the required functions and everything ended up working.
I have been researching this, and cannot seem to find anything about it.
We work on CF8. When my coworker tried installing my latest code updates, he started seeing errors that the argument supplied to a function was not of the specified interface type. Worked fine for me. Same set up. Sometimes it works for him. Also have the problem on our dev server.
I have since been able to isolate and reproduce the problem locally.
Here is the set up.
I have 2 mappings on the server:
"webapp/" goes to c:\webroot\
"packages/" goes to c:\webroot\[domain]
Then I created an interface, call it ISubject and a component that implements it, called Person, and saved both under packages. Here is the declaration for Person:
cfcomponent implements="packages.ISubject"
Finally, there is a component, called SubjectMediator with a function, called setSubject, that wants an object of the ISubject interface type. Here is the argument declaration for setSubject:
cfargument name="subject_object" type="packages.ISubject"
To implement:
variables.person = createObject("component", "packages.Person").Init();
variables.subjectMediator = createObject("component", "packages.SubjectMediator ").Init();
variables.subjectMediator.setSubject(variables.person);
That last line throws the error that Person is not of type ISubject. If I do isInstanceOf() on Person against ISubject it validates fine.
So the reason this is happening? Dumping getMetaData(variables.person) shows me that the interface path is webapp.[domain].ISubject. And indeed, if I change the type attribute of the argument to use this path instead of packages.ISubject, all is fine again.
Coldfusion seems to be arbitrarily choosing which mapping to resolve the interface to, and then simply doing a string comparison for check the type argument?
Anyone had to contend with this? I need the webapp mapping, and I cannot change all references to "packages" to "webapp.[domain]." I also am not able in this instance to use an application-specific mapping for webapp. While any of these 3 options would circumvent the issue, I'm hoping someone has some insight...
The best I've got is to set argument type to "any" and then check isInstanceOf() inside the function... Seems like poor form.
Thanks,
Jen
Can you move the contents of the packages mapping to outside the webroot? This seems like the easiest way to fix it.
I am using the Aria C++ programming libs for mobile robots (http://robots.mobilerobots.com/wiki/ARIA). I am new to this API so I wanted to start with a simple action class derived from ArAction. Now I tried to develop a small test program (an ArAction) in order to
control a simulated p3dx robot via MobileSim. Development takes place under Ubuntu 10.10, using gcc 4.4.5. Making (compiling) my code works fine, without errors. I can also set the desired speed for example in my ArAction's fire() method, and the simulation is also working as desired.
But, unfortunately, I can't use the ArRobot object attached to the ArAction I am overriding. The problem is that none of the member functions of the ArRobot object seems to work. For example, calling getVel() or getCompass() always returns a zero value. And when I call the hasFrontBumpers() method the program even crashes with the error message "Aria: Received signal 'SIGSEGV'. Exiting.". As soon as I remove this method call and recompile the error is also gone again...
Here is the relevant code that leads to the crash:
ArActionDesired * forward::fire(ArActionDesired d)
{
desiredState.reset();
ArRobot *r = getRobot();
if(r == NULL)
{
printf("ArRobot = NULL\n");
deactivate();
return &desiredState;
}
printf("ok, ArRobot is not NULL, check for bumpers...\n");
r->hasFrontBumpers(); // <-- this leads to the SIGSEV-based "crash"
return &desiredState;
}
Any ideas what I am missing here -- is it a problem with my coding, or with the simulation environment? Thanks in advance for your help!
Kind regards, Matthias
ok, found it out now -- for the records: the Aria libs in version 2.7.2 are based on gcc-3 and libstdc++ 5, but Ubuntu 10.10 (which I am using) is shipped with gcc-4 and libstdc++ 6 per default. So I had to manually install the older versions of both packages, now my code is running fine...
cheers!
Calling hasFrontBumpers() for a p3dx from the fire() works fine for me on a similar Linux platform. If something is wrong, it is not in this method but in the initialization of the system. A reason for the non-moving robot could be that robot.enableMotors() hasn't been called.