I am following the Stanford University iOS development course on iTunes U.
In one of the demos (that I have been trying to follow), there is this code that loads the property list from an NSURL and returns it as NSMutableDictionary.
-(NSMutableDictionary *) words
{
NSURL *wordsURL=[NSURL URLWithString:#"http://cs193p.stanford.edu/vocabwords.txt"];
words=[[NSMutableDictionary dictionaryWithContentsOfURL:wordsURL] retain];
return words;
}
The application is successfully built, but at runtime it gives the following error and gets stuck:
I can't figure out what the problem is. Can you please help?
You're stopped at a breakpoint. That's a debugging tool, not an error. See the blue arrow/tab in the left margin, where the line numbers are? Drag that away and drop it anywhere (you'll see a "poof") to remove it, then run your project again.
You can also deactivate all breakpoints by typing ⌘-Y, the key equivalent for the menu item Debug>Deactivate Breakpoints, or you can view all your breakpoints in the Breakpoint Navigator (hit ⌘-6).
When execution stops like this, you can continue from the breakpoint, either by typing continue at the debugger prompt in the Console:
(lldb) continue
Or hitting the "Play" button in the debugger controls. You can also type Control-⌘-Y, which is the equivalent for the menu item Debug>Continue.
This isn't an error. You just set a breakpoint (probably without knowing it).
Drag the little blue Chevron in the column at the left out of the way. You will see it disappear and go poof, and then you can rebuild your app and you should see it run properly.
Now, that said, I think there are some memory management mistakes in your code, but we can return to those later. ;-)
The program is stopping because you have a breakpoint.. That's the blue arrow on the left of the code. Right-click it and delete.
Related
I am getting the following error on my app when it randomly crashes during testing.
The logs show the following:
Is there any way possible I can track why this error is apprearing? I'll be super grateful.
Best.
Go to the Breakpoint Navigator. Click the plus sign on the bottom left. Add exception breakpoint. It will break right before the weird error you are seeing :)
You know the pane on the left that shows your files? At the top of it there are 7 buttons or so, and one is shaped like a breakpoint. That's the navigator.
I'm debugging an iOS app in Xcode, and I'm wondering is there any way to see which line of code I just ran? I'm trying to figure out where the code is that is responsible for making a menu slide open when I tap the menu key.
Thanks
Set a breakpoint (tap on a line number in Xcode) and manually run the code line by line using Xcode's Debug menu. In your case you can set a breakpoint on the method that is executed when a button is pushed. If you do not know which method is called when you push the button, you could look at where the button is declared, which should have a addTarget method, or see what it is hooked up to in the Storyboard.
If you have a few places where you think the code is executed, you can use NSLog() statements and see what is being printed to the console at what time.
hi after crashing i set the exception break point by pressing break point symbol and i choose objective c language while editing the break point. I run it again ,app is crashed ,but it is not stopped where the exception is occurred in xcode6
Thanks in advance.
Ok than try using enabling zombie environment.
Follow these steps:
Click on project name and edit scheme.
A pop over will appear, In that select Arguments tab. See bottom section Environment Variables. You can see + button at bottom part. Click on that button and add varialbe NSZombieEnabled with value YES.
Now from same popover select Diagnostics tab. And mark Enable Zombie Objects.
Click close and again run your project, hope this will track down zombie objects at runtime which cause runtime crash.
See the following steps.
Look into [Navigator] and Click on [Show the Breakpoint Navigator].
See the bottom of Navigator [ + ] Sign. Click on it
Select [Add Exception Breakpoint].
Your Exception Breakpoint are activated from this things.
So my app is 100% done, however when I compile it in xcode the app loads up normal, but when I press the button, which is the apps main function, it encounters a thread breakpoint error and I'm not sure why.
When I run the app by itself in the simulator without xcode it runs perfect, the thread error only happens when I run it in xcode.
Thanks again for any help that can be provided!
Click on that dark blue arrow next to the "Play Sound" comment, and it will turn light blue (disabled). Or right click (or option-click) on the blue arrow and you have an option to remove the breakpoint.
Or select the breakpoint navigator ("View" - "Navigators" - "Show Breakpoint Navigator") and manage your breakpoints there.
See WWDC 2012 video Debugging in Xcode.
Your app stops when running in the debugger because you have set a breakpoint at that line. Delete or disable the breakpoint. There is nothing wrong here and there is no error. The debugger is doing exactly what you told it to do.
In XCode 9 the easiest way to delete breakpoint is to just left-click and drag it.
I have no idea what is after going wrong but I'll state the events that happened before the error occurred
1: App was running fine as I was adding functionality.
2: I noticed that one of the view controllers was not showing the correct version but an older one. (I had added in a segmented control and it wasn't showing up)
3: I tried to uninstall the from my phone and build it again but it was still showing the old controller
4: I tried cleaning the project to recompile everything, after this step the application started to give me this problem
http://i.imgur.com/105yDr8.png
Some extra information:
1: This error occurs on the black screen before any view controllers load
2: The view controller I was working on was not the first view controller (so I do not think that it is the problem)
3: The main view controller has not been changed in days and was working perfectly since it was finished
I have absolutely no idea what is going wrong, and help would be greatly appreciated
UPDATE 1
New error message
http://i.imgur.com/5XVJWHT.png
UPDATE 2
Screenshot of storyboard and a finder window that opened when I clicked "show in finder on the storyboard". This would lead me to believe that it does know where the file is
http://i.imgur.com/Ybas1Yx.png
You've (probably accidentally) set a breakpoint at the return UIApp...-line.
You can identify a breakpoint by it's blue color at the left of a line. If it's activated, it's dark blue, else it's light blue. You can just drag it either to the trash can or somewhere else in your window to completely delete the breakpoint.
your app is getting crashed due to exception check the pannel objc_exception_throw
add exception breakpoint and you'll get the line of code where your app is crashing
It sounds like something is broken, and throws an exception. You're just seeing the exception being caught.
The way to investigate what is throwing is to add an exception breakpoint. Go to the breakpoints list and hit +, choose exception breakpoint and leave it at all. This should give you a breakpoing at the point where the except is being thrown.
As to what is happening. You had an app that ran with an old VC, you deleted the app and re-installed and now it crashes, so best guess is that your old version had the VC, but new one doesn't. Sounds like a missing xib or storyboard. It clearly isn't missing from the project, as you'd see that immediately, but check for target membership, changed name or localization problems.
I fixed the problem by renaming the storyboard to MainStoryboard1 and changing the target in
project > target > summary > iphone/ipod deployment