2014/10/15 下午 10:10:41

iphone Programming Glossary: ivar

Declaration/definition of variables locations in ObjectiveC?

http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec

and .m #import Foundation Foundation.h 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h.. interface can define private methods and properties here @end @implementation SampleClass 6 define ivars 7 define methods and synthesize properties from both public and private interfaces @end My understanding.. before. Are there other convenient uses I'm missing My take from working with iOS is that ivars have been alost completely phased out outside of the @synthesize directive and thus can be mostly ignored...

iPhone ivar naming convention [duplicate]

http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention

ivar naming convention duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa..

Prefixing property names with an underscore in Objective C [duplicate]

http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c

improve this question Current suggested Objective C 2.0 practice is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact.. is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized accessors for a property will.. declaration but the fact that by default synthesized accessors for a property will access the ivar with the same name as the property indicates that's the pattern they expect you to follow. No matter..

Difference between self.ivar and ivar?

http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar

between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString.. between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString name.. @ hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor..

Property vs instance variable in Objective-C [duplicate]

http://stackoverflow.com/questions/6146244/property-vs-instance-variable-in-objective-c

Property vs. instance variable

http://stackoverflow.com/questions/719788/property-vs-instance-variable

premise behind this strategy is so that one can easily distinguish the difference between an ivar and property. So if I want to use the memory management inherited by a synthesized property I'd use.. property I'd use something such as myVar @ Foo The other way would be referencing it via self. ivar property here . The problem with using the @synthesize myVar _myVar strategy is I figured that writing.. c cocoa cocoa touch share improve this question Properties are just setters and getters for ivars and should almost always be used instead of direct access. @interface APerson NSObject NSString _name..

View Controllers: How to switch between views programmatically?

http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically

like this id initWithNib Load the view nib if self super initWithNibName @ ViewA bundle nil do ivar initialization here if needed return self That works. I see the view from ViewControllerA when I start..

Declaration/definition of variables locations in ObjectiveC?

http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec

correct my present understanding Here's a sample class .h and .m #import Foundation Foundation.h 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h 4 what goes here @interface SampleClass 5 private.. 4 what goes here @interface SampleClass 5 private interface can define private methods and properties here @end @implementation SampleClass 6 define ivars 7 define methods and synthesize properties from both public and private interfaces @end My understanding of 1 and 4 is that those are C style file based declarations.. seen them used for implementing static variable based singletons before. Are there other convenient uses I'm missing My take from working with iOS is that ivars have been alost completely phased out outside of the @synthesize directive and thus can be mostly ignored. Is that the case Regarding 5 why would I ever want to..

iPhone ivar naming convention [duplicate]

http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention

ivar naming convention duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective c class work I've noticed that in a lot of the..

Prefixing property names with an underscore in Objective C [duplicate]

http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c

the preferred one iphone objective c coding style share improve this question Current suggested Objective C 2.0 practice is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized accessors for a property will.. improve this question Current suggested Objective C 2.0 practice is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized accessors for a property will access the ivar with the same name as the property indicates.. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized accessors for a property will access the ivar with the same name as the property indicates that's the pattern they expect you to follow. No matter what since objects still have to send messages to themselves..

Difference between self.ivar and ivar?

http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar

between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString name @end aclass.m @implementation aClass @synthesize name.. between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString name @end aclass.m @implementation aClass @synthesize name void.. Could someone please explain the difference between name @ hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor and or mutator defined by you this is nonatomic and retain..

Property vs instance variable in Objective-C [duplicate]

http://stackoverflow.com/questions/6146244/property-vs-instance-variable-in-objective-c

Property vs. instance variable

http://stackoverflow.com/questions/719788/property-vs-instance-variable

MyClass @synthesize myVar _myVar Now I thought the entire premise behind this strategy is so that one can easily distinguish the difference between an ivar and property. So if I want to use the memory management inherited by a synthesized property I'd use something such as myVar @ Foo The other way would be referencing.. I want to use the memory management inherited by a synthesized property I'd use something such as myVar @ Foo The other way would be referencing it via self. ivar property here . The problem with using the @synthesize myVar _myVar strategy is I figured that writing code such as myVar some_other_object doesn't work. The compiler.. is undeclared. Why is that the case Thanks. iphone objective c cocoa cocoa touch share improve this question Properties are just setters and getters for ivars and should almost always be used instead of direct access. @interface APerson NSObject NSString _name necessary for legacy runtime @property readwrite NSString..

View Controllers: How to switch between views programmatically?

http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically

vcA.view cvA release By the way the initWithNib method looks like this id initWithNib Load the view nib if self super initWithNibName @ ViewA bundle nil do ivar initialization here if needed return self That works. I see the view from ViewControllerA when I start the app. But now the big question is A View Controller typically..

Declaration/definition of variables locations in ObjectiveC?

http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec

a sample class .h and .m #import Foundation Foundation.h 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h 4 what.. 5 private interface can define private methods and properties here @end @implementation SampleClass 6 define ivars 7 define methods and synthesize properties from both public and private interfaces @end My understanding of 1 and 4 is.. variable based singletons before. Are there other convenient uses I'm missing My take from working with iOS is that ivars have been alost completely phased out outside of the @synthesize directive and thus can be mostly ignored. Is that the..

iPhone ivar naming convention [duplicate]

http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention

ivar naming convention duplicate Possible Duplicate How does an underscore in front of a variable in a cocoa objective c class..

Prefixing property names with an underscore in Objective C [duplicate]

http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c

style share improve this question Current suggested Objective C 2.0 practice is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized.. Objective C 2.0 practice is to use the same name for the ivar as the property. You can optionally assign a different ivar in the @property declaration but the fact that by default synthesized accessors for a property will access the ivar with.. ivar in the @property declaration but the fact that by default synthesized accessors for a property will access the ivar with the same name as the property indicates that's the pattern they expect you to follow. No matter what since objects..

Difference between self.ivar and ivar?

http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar

between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString name @end aclass.m.. between self.ivar and ivar aclass.h @interface aClass NSObject NSString name @property nonatomic retain IBOutlet NSString name @end aclass.m @implementation.. difference between name @ hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor and or mutator defined..

Property vs instance variable in Objective-C [duplicate]

http://stackoverflow.com/questions/6146244/property-vs-instance-variable-in-objective-c

Property vs. instance variable

http://stackoverflow.com/questions/719788/property-vs-instance-variable

Now I thought the entire premise behind this strategy is so that one can easily distinguish the difference between an ivar and property. So if I want to use the memory management inherited by a synthesized property I'd use something such as myVar.. by a synthesized property I'd use something such as myVar @ Foo The other way would be referencing it via self. ivar property here . The problem with using the @synthesize myVar _myVar strategy is I figured that writing code such as myVar.. iphone objective c cocoa cocoa touch share improve this question Properties are just setters and getters for ivars and should almost always be used instead of direct access. @interface APerson NSObject NSString _name necessary for legacy..

View Controllers: How to switch between views programmatically?

http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically

method looks like this id initWithNib Load the view nib if self super initWithNibName @ ViewA bundle nil do ivar initialization here if needed return self That works. I see the view from ViewControllerA when I start the app. But now..

Internal properties versus ivars

http://stackoverflow.com/questions/10469488/internal-properties-versus-ivars

the top of my head Suppose you discovered that you needed to validate the value before saving it. If you were using an iVar you would have to ensure that anywhere that iVar was used you had a call the validation code before you allowed it's value.. needed to validate the value before saving it. If you were using an iVar you would have to ensure that anywhere that iVar was used you had a call the validation code before you allowed it's value to be changed. With a property you would only.. argue that one is just as easy as the other and that may be true in many cases but there is one handicap with the iVar here you cannot ensure that future changes by you or other coders will insert the validation before the iVar is changed...

Objective-C Category and new iVar

http://stackoverflow.com/questions/10502539/objective-c-category-and-new-ivar

C Category and new iVar I try to extend the functionality of SimpleAudioEngine of cocos2d with the ability to play several sound effect one after.. as some kind of chain. I tried to do this with an extension. However I now realized that I probably also need an iVar to remember the names of all sound files and one to remember which sound is currently playing. However it seems that I cannot.. the names of all sound files and one to remember which sound is currently playing. However it seems that I cannot add iVars in a category. Instead I tried to use an extension but it seems that they need to be in the original .m file of the class..

Difference between class property mVar and instance variable self.mVar

http://stackoverflow.com/questions/2278389/difference-between-class-property-mvar-and-instance-variable-self-mvar

I accessed countLabel as self.countLabel What would be the difference Edit Third example per users' answer Say it the iVar wasn't an IBOutlet In .h file @interface Fake NSObject NSString mVar @property nonatomic retain NSString mVar In .m file.. no different since a property access could just as easily come from outside the class as from inside it . Say it the iVar wasn't an IBOutlet That doesn't matter. IBOutlet only means anything to IB. Everything else doesn't care. In fact IBOutlet..

UISearchDisplayContoller ??can't prevent table reload on typing in search bar

http://stackoverflow.com/questions/3903718/uisearchdisplaycontoller-cant-prevent-table-reload-on-typing-in-search-bar

the first char display status as to the current search filter operation in the SDC delegate class definition add the iVar BOOL isLoading add the iVar UITableView searchTableView in searchDisplayController didLoadSearchResultsTableView set searchTableView.. as to the current search filter operation in the SDC delegate class definition add the iVar BOOL isLoading add the iVar UITableView searchTableView in searchDisplayController didLoadSearchResultsTableView set searchTableView tableView in shouldReloadTableForSearchString.. if you are hiding the table and showing the overlay. in the SDC delegate class definition same as Option 1 add the iVar UIView searchTableOverlayView in searchDisplayController didLoadSearchResultsTableView same as Option 1 create a UIView..

iVar property, access via self?

http://stackoverflow.com/questions/4088801/ivar-property-access-via-self

property access via self I understand that when accessing setter getter methods for properties I should be using self setThisValue.. thisValue @ a However with the example below I can see that adding self documents that I am sending a message to an iVar property rather than a locally scoped variable but does it do anything else in this case @interface CustomController UIViewController..

Is it a problem when an iAd may be obscured?

http://stackoverflow.com/questions/4160010/is-it-a-problem-when-an-iad-may-be-obscured

bannerView.frame CGRectMake 0.0 0.0 bannerView.frame.size.width bannerView.frame.size.height Assuming you had an iVar IBOutlet to your AdBannerView called bannerView this would take care of any interface builder positioning issues and make..

Repeating NSTimer, weak reference, owning reference or iVar?

http://stackoverflow.com/questions/4945028/repeating-nstimer-weak-reference-owning-reference-or-ivar

NSTimer weak reference owning reference or iVar I thought I would put this out here as a separate question from my previous retaining repeating nstimer for later access.. ... ... Cancel method self walkTimer invalidate self setWalkTimer nil ... ... dealloc method super dealloc . 3 Use an iVar and rely on the runLoop holding i.e. retaining the timer NSTimer walkTimer NSTimer walkTimer NSTimer scheduledTimerWithTimeInterval.. ... Dealloc method super dealloc updateTimer release It should be noted that in the examples Apple are assigning the iVar directly and not using the property setter. iphone objective c cocoa touch nstimer share improve this question Edit..

If you have an IBOutlet, but not a property, is it retained or not?

http://stackoverflow.com/questions/5523290/if-you-have-an-iboutlet-but-not-a-property-is-it-retained-or-not

away I would certainly assume this is the case but who knows The question is what happens if you DO use an IBOutlet iVar but NOT a property... I've foolishly never thought about this before assumed too much does anyone have the decisive answer..

What's the best way to communicate between view controllers?

http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers

doing this push. Which class file in my code is the correct place When I want to affect some piece of data value of an iVar in one of my UIViewControllers when I am in a different UIViewController what is the right way to do this Give that we can..

iPhone - Call a php page asynchronously and be sure it has been loaded

http://stackoverflow.com/questions/5918473/iphone-call-a-php-page-asynchronously-and-be-sure-it-has-been-loaded

NSURLConnection conn NSURLConnection alloc initWithRequest request delegate self responseData is your NSMutableData iVar. 2. Implement delegate methods a In this method we will check for HTTP status codes void connection NSURLConnection connection..

ObjectiveC ivars or @property

http://stackoverflow.com/questions/6942439/objectivec-ivars-or-property

time I find myself writing ivar release ivar newIvar retain As Sam says there is already a potential bug there if iVar newIVar . This is the point at which I switch from using ivars directly to creating a property. However I put the declaration..

Xcode 4 - clang error

http://stackoverflow.com/questions/8301649/xcode-4-clang-error