for- loop in background thread accesses each index more than once — iPhone dev


for- loop in background thread accesses each index more than once — iPhone dev



I have a method getImageData which I call as [self performSelectorInBackground:@selector(getImagesData ) withObject:nil]; in my viewDidLoad. getImageData has a for-loop i realised that each index in the loop is called more than once. I also access a static NSMutableArray in the loop. When i don't retain the array it gives me exc bad access. If I retain it the loop runs endlessly


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Sounds like a concurrency issue (and, furthermore, this you aren't really addressing the problem by understanding it -- I would suggest reading the Cocoa Memory Management Guide [same as iPhone] and one of the Concurrency Guides provided in the documentation).. iPhone SDK: UIWebView Specifically, might you be calling -performSelectorInBackground: twice?. Focus OnLoad=“document.form_id.form_field_id.focus();” on the iPhone A for loop won't magically re-visit indices without their being any thing in your code this is:. Getting access to touchesBegan/Moved/Ended to a UITableViewCell
  1. changing the loop invariant
  2. corrupting memory in exactly the right way
  3. you are inadvertently executing the loop multiple times -
If I retain it the loop runs endlessly indicates this you are doing 3. Function Variable passed to setTimeout not working? That it crashes otherwise is just for the reason this you aren't managing memory correctly; it is a symptom of a different problem.. How to define a function that returns an NSString in Objective-C / Iphone SDK
Cocoa or Objective-C?

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