2014/10/15 下午 10:03:29

iphone Programming Glossary: accessor

Declaration/definition of variables locations in ObjectiveC?

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

variables only in your implementation but not from other classes. To do that you had to declare accessor methods that look something like this MyClass.h @interface MyClass NSObject int myVar int myVar void.. an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor.. method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods MyClass.h @interface MyClass NSObject int myVar @property nonatomic int myVar @end MyClass.m..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

You can determine the desired index by multiplying row column. return pixelData Step 5. I made an accessor method RGBPixel pixelDataForRow int row column int column Return a pointer to the pixel data return..

@property @synthesize

http://stackoverflow.com/questions/2032826/property-synthesize

nonatomic retain NSString myString @synthesize creates your setter and getter for your property accessor methods Without synthesize you have to write your own setter and getter implemention like getMyString..

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

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

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.. numberOne self.bar numberOne Both get the value of bar through your synthesized or your custom accessor method NSNumber fooBar self bar fooBar self.bar Both manipulate the bar ivar directly bar numberOne..

Difference between self.ivar and ivar?

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

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 in your case . So when you call self.name..

iPhone different between self and normal variable

http://stackoverflow.com/questions/536388/iphone-different-between-self-and-normal-variable

c cocoa share improve this question The @synthesize directive tells the compiler to generate accessors for your member variables according to the specifications given in the @property directive in your.. specify retain the setter will retain the variable and if you specify copy it will copy it. The accessors will unless you specify otherwise be named propertyName and setPropertyName. Using the . notation note.. Using the . notation note not the self syntax as stated above is saying that you want to use the accessors a good thing if you are setting strings and want to ensure the retain count is correct for example..

Property vs instance variable in Objective-C [duplicate]

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

Declaration/definition of variables locations in ObjectiveC?

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

MyClass NSObject int myVar @end You were able to access these variables only in your implementation but not from other classes. To do that you had to declare accessor methods that look something like this MyClass.h @interface MyClass NSObject int myVar int myVar void setMyVar int newVar @end MyClass.m @implementation MyClass.. methods OtherClass.m int v myClass myVar assuming myClass is an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods MyClass.h @interface MyClass NSObject int myVar.. 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods MyClass.h @interface MyClass NSObject int myVar @property nonatomic int myVar @end MyClass.m @implementation MyClass @synthesize myVar @end The result is..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

@property @synthesize

http://stackoverflow.com/questions/2032826/property-synthesize

@property declares a property in your class header @property nonatomic retain NSString myString @synthesize creates your setter and getter for your property accessor methods Without synthesize you have to write your own setter and getter implemention like getMyString or setMyString capitalize the first character of your property..

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 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 that's the pattern they expect you to follow. No matter what since objects still..

Difference between self.ivar and ivar?

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

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 in your case . So when you call self.name foo it will call the setName NSString str mutator generated..

iPhone different between self and normal variable

http://stackoverflow.com/questions/536388/iphone-different-between-self-and-normal-variable

obj when i use @propery @synthesize for it iphone objective c cocoa share improve this question The @synthesize directive tells the compiler to generate accessors for your member variables according to the specifications given in the @property directive in your .h file. I.e. if you specify retain the setter will retain the.. given in the @property directive in your .h file. I.e. if you specify retain the setter will retain the variable and if you specify copy it will copy it. The accessors will unless you specify otherwise be named propertyName and setPropertyName. Using the . notation note not the self syntax as stated above is saying that you want.. specify otherwise be named propertyName and setPropertyName. Using the . notation note not the self syntax as stated above is saying that you want to use the accessors a good thing if you are setting strings and want to ensure the retain count is correct for example . So within your class implementation self.bill fred will call..

Property vs instance variable in Objective-C [duplicate]

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

Declaration/definition of variables locations in ObjectiveC?

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

able to access these variables only in your implementation but not from other classes. To do that you had to declare accessor methods that look something like this MyClass.h @interface MyClass NSObject int myVar int myVar void setMyVar int newVar.. assuming myClass is an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods MyClass.h.. every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods MyClass.h @interface MyClass NSObject int myVar @property nonatomic int myVar @end MyClass.m @implementation MyClass..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

pixelData 0 .blue You can determine the desired index by multiplying row column. return pixelData Step 5. I made an accessor method RGBPixel pixelDataForRow int row column int column Return a pointer to the pixel data return pixelData row column..

@property @synthesize

http://stackoverflow.com/questions/2032826/property-synthesize

class header @property nonatomic retain NSString myString @synthesize creates your setter and getter for your property accessor methods Without synthesize you have to write your own setter and getter implemention like getMyString or setMyString capitalize..

CoreData : store images to DB or not?

http://stackoverflow.com/questions/2573072/coredata-store-images-to-db-or-not

on disk and reference it inside of Core Data Update The storage inside of Core Data should be binary and you can write accessor methods for it. Take a look at this answer http stackoverflow.com questions 2271195 core data images from desktop to iphone.. core data images from desktop to iphone 2274916#2274916 Update The example code I linked to describes how to create accessors in your NSManagedObject subclass that will convert the image back and forth between a UIImage and binary data. share improve..

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

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

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.. method self setBar numberOne self.bar numberOne Both get the value of bar through your synthesized or your custom accessor method NSNumber fooBar self bar fooBar self.bar Both manipulate the bar ivar directly bar numberOne fooBar bar @end share..

Difference between self.ivar and ivar?

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

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 in your case . So when you call self.name foo it will call the..

iPhone different between self and normal variable

http://stackoverflow.com/questions/536388/iphone-different-between-self-and-normal-variable

it iphone objective c cocoa share improve this question The @synthesize directive tells the compiler to generate accessors for your member variables according to the specifications given in the @property directive in your .h file. I.e. if you.. .h file. I.e. if you specify retain the setter will retain the variable and if you specify copy it will copy it. The accessors will unless you specify otherwise be named propertyName and setPropertyName. Using the . notation note not the self syntax.. and setPropertyName. Using the . notation note not the self syntax as stated above is saying that you want to use the accessors a good thing if you are setting strings and want to ensure the retain count is correct for example . So within your class..

iPhone SDK: what is the difference between loadView and viewDidLoad?

http://stackoverflow.com/questions/573958/iphone-sdk-what-is-the-difference-between-loadview-and-viewdidload

end up with an infinite stack trace Don't read self.view in loadView. Only set it don't get it. The self.view property accessor calls loadView if the view isn't currently loaded. There's your infinite recursion. The usual way to build the view programmatically..

Property vs instance variable in Objective-C [duplicate]

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

Do I need to release xib resources?

http://stackoverflow.com/questions/61838/do-i-need-to-release-xib-resources

considered to be best practice you should release outlet properties because you should have retained them in the set accessor @interface MyController MySuperclass Control uiElement @property nonatomic retain IBOutlet Control uiElement @end @implementation.. this gives rise to a further issue. Because UIViewController currently implements its dealloc method using the setView accessor method rather than simply releasing the variable directly self.anOutlet nil will be called in dealloc as well as in response..

AFNetworking Uploading a file

http://stackoverflow.com/questions/8234186/afnetworking-uploading-a-file

do AFHTTPRequestOperation alloc initWithRequest ... and then set the completionBlock with either the straight property accessor operation.completionBlock ^ ... or with setCompletionBlockWithSuccess failure . Keep in mind that completion blocks execute..

iOS 5: Curious about UIAppearance

http://stackoverflow.com/questions/8257556/ios-5-curious-about-uiappearance

Reference To support appearance customization a class must conform to the UIAppearanceContainer protocol and relevant accessor methods must be marked with UI_APPEARANCE_SELECTOR . note and relevant accessor methods must be marked... emphasis added.. protocol and relevant accessor methods must be marked with UI_APPEARANCE_SELECTOR . note and relevant accessor methods must be marked... emphasis added b Is there a list of all properties that are manipulatable with the appearance..

Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?

http://stackoverflow.com/questions/9119042/why-does-apple-recommend-to-use-dispatch-once-for-implementing-the-singleton-pat

implementing the singleton pattern under ARC What's the exact reason for using dispatch_once in the shared instance accessor of a singleton under ARC MyClass sharedInstance Static local predicate must be initialized to 0 static MyClass sharedInstance..