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2014/10/15 ¤U¤È 10:13:24
iphone Programming Glossary: retaininghttp://stackoverflow.com/questions/1031554/nstimer-doesnt-stop iphone cocoa touch timer share improve this question I should have been keeping a link to the timer by retaining it. I've asked this question 5 months ago and it's amazing how much more experience I acquired. timer NSTimer scheduledTimerWithTimeInterval..
Memory Management in Objective-C [duplicate] http://stackoverflow.com/questions/106627/memory-management-in-objective-c to me is there a good resource anyone can point me to for some basic memory management techniques in ObjectiveC ex. retaining releasing autoreleasing For instance is it completely illegal to use a pointer to an Objective C object and treat it as..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership of these objects ensures they..
Does an IBOutlet needs to be a property & synthesized? http://stackoverflow.com/questions/1221516/does-an-iboutlet-needs-to-be-a-property-synthesized OutletName . If it exists call it. If no method exists look for an instance variable named OutletName set it without retaining . On iPhone OS IBOutlets are connected like this call object setValue outletValue forKey @ OutletName The behavior of set..
What happens if I don't retain IBOutlet? http://stackoverflow.com/questions/1250518/what-happens-if-i-dont-retain-iboutlet a valid reference to your textfield. Perhaps a more concrete example would be useful to indicate why you should use a retaining property I'm going to make some assumptions about the context in which you're working I'll assume the UITextField above..
Objective-C 101 (retain vs assign) NSString http://stackoverflow.com/questions/1380338/objective-c-101-retain-vs-assign-nsstring an assign property is in a case where you can't retain the value such as non object types like BOOL or NSRect or when retaining it would cause unwanted side effects. Incidentally in the case of an NSString the correct kind of property is usually copy..
iPhone - dealloc - Release vs. nil http://stackoverflow.com/questions/1458178/iphone-dealloc-release-vs-nil dealloc. Is assigning nil to a property bar on self that will in practice release whatever the property is currently retaining. Do this if you have a custom setter for the property that is supposed to cleanup more than just the instance variable backing..
Why am I crashing after MKMapView is freed if I'm no longer using it? http://stackoverflow.com/questions/2188098/why-am-i-crashing-after-mkmapview-is-freed-if-im-no-longer-using-it share improve this question This is because of the way MKMapView works. There's an operation pending so MapKit is retaining the MKMapView and it hasn't actually been deallocated yet. That isn't itself a problem. The problem is that it's still sending..
@property and retain, assign, copy, nonatomic in Objective-C http://stackoverflow.com/questions/2255861/property-and-retain-assign-copy-nonatomic-in-objective-c
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self additional code that might be built into UIApplication's setMainViewController method such as releasing old objects retaining new ones updating internal variables and so on. In the case where your accessing the frame you're still calling a setter..
unrecognized selector sent to instance http://stackoverflow.com/questions/2455161/unrecognized-selector-sent-to-instance
Non-retaining array for delegates http://stackoverflow.com/questions/4692161/non-retaining-array-for-delegates retaining array for delegates In a Cocoa Touch project I need a specific class to have not only a single delegate object but many.. it shouldn't by convention objects should not retain their delegates . Should I write my own array class to prevent retaining or are there simpler methods Thank you iphone cocoa touch delegates nsarray retain share improve this question I found..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy its implementation of copyWithZone . also copy gives you the expected behavior. in other words there is not a use for retaining a string if it is in fact immutable. in order to guarantee that you're dealing with an immutable string you simply copy.. implementation. so NSMutableString is a bad argument for the setter. NSString is the appropriate setter unless you're retaining the string. NSMutableString is also an ambiguous getter see the implementation. does it copy autorelease or retain autorelease..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c other parts of the system crashing because you've freed memory they were using. Assuming everyone is playing along and retaining releasing according to the rules when one piece of code retains and then releases the object any other piece of code also..
Retain Cycles: Why is that such a bad thing? http://stackoverflow.com/questions/791322/retain-cycles-why-is-that-such-a-bad-thing a bad thing There are two Objects A and B. A creates B and retains it. B has an instance variable that points to A retaining it. So both retain eachother. Some people say that this strong connection can't be broken ever again. But is that really.. Or does this problem only apply in a case where A does not create B but just holds a strong reference to it through retaining it in an instance variable I still don't see why that connection could not be broken up again. iphone cocoa touch memory..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons in the project I'm working on at the moment was written pre iOS 5.0. I was just wondering does the convenience of not retaining releasing manually and presumably more reliable code that comes as a result outweigh any 'cost' of using ARC What are your..
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