2014/10/15 下午 10:03:29

iphone Programming Glossary: accessors

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..

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 .h.. 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

Property vs. instance variable

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

_name release _name value It's easy now to distinguish between ivars and getters setters. The accessors have got the self. prefix. You shouldn't access the variables directly anyway. Your sample code doesn't..

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..

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

Property vs. instance variable

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

_name copy autorelease void setName NSString value value retain _name release _name value It's easy now to distinguish between ivars and getters setters. The accessors have got the self. prefix. You shouldn't access the variables directly anyway. Your sample code doesn't work as it should be _myVar some_other_object _myVar is..

Customizing the iPhone keyboard

http://stackoverflow.com/questions/1014705/customizing-the-iphone-keyboard

this is as simple as assigning the property for other classes you will probably have to subclass or swizzle the accessors as the property is declared read only by default. More details on this are available in the documentation . Unfortunately..

Best way to implement Enums with Core Data

http://stackoverflow.com/questions/1624297/best-way-to-implement-enums-with-core-data

this. iphone objective c cocoa cocoa touch core data share improve this question You'd have to create custom accessors if you want to restrict the values to an enum. So first you'd declare an enum like so typedef enum kPaymentFrequencyOneOff.. Then declare getters and setters for your property. It's a bad idea to override the existing ones since the standard accessors expect an NSNumber object rather than a scalar type and you'll run into trouble if anything in the bindings or KVO systems..

New to Core Data for iphone

http://stackoverflow.com/questions/1656476/new-to-core-data-for-iphone

ripped straight out of one of the Xcode template apps and pasted into your program this holds especially true for the accessors for the three Core Data objects you need . Be careful not to use code you don't understand though. share improve this answer..

Core data images from desktop to iphone

http://stackoverflow.com/questions/2271195/core-data-images-from-desktop-to-iphone

bits representationUsingType NSPNGFileType properties nil myManagedObject setImage data I recommend writing custom accessors to handle this like the following #ifdef IPHONEOS_DEPLOYMENT_TARGET void setImage UIImage image self willChangeValueForKey..

Animating a custom property of CALayer subclass

http://stackoverflow.com/questions/2395382/animating-a-custom-property-of-calayer-subclass

releases though I believe i.e. iPhone 3.0 and OS X 10.6 . Make your property dynamic so that CA implements the accessors for you @dynamic myInt Tell the layer that changes of the property require redrawing BOOL needsDisplayForKey NSString key..

CoreData : store images to DB or not?

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

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 follow...

Repeating NSTimer, weak reference, owning reference or iVar?

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

aware of Not that the latter has to say much but... So my advice is... Don't make your timer a property don't provide accessors for it Instead keep it private with the modern runtime i think you could go so far as to define the ivar in a class extension..

NSMutableString as retain/copy

http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy

is now improved more correct requires less documentation and performs better. you can also remove publicly visible accessors if you don't need them. we can live with that interface where it is required. but there's more as it turns out the interface..

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..

Why does this create a memory leak (iPhone)?

http://stackoverflow.com/questions/612986/why-does-this-create-a-memory-leak-iphone

backing the @property is called editMyObject . Calling the accessor via self.editMyObject is safe for @synthesized accessors but if an overriden accessor relies on object state which may not be valid at the calling location in dealloc or causes..

Property vs instance variable in Objective-C [duplicate]

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

ObjectiveC ivars or @property

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

Property vs. instance variable

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

value value retain _name release _name value It's easy now to distinguish between ivars and getters setters. The accessors have got the self. prefix. You shouldn't access the variables directly anyway. Your sample code doesn't work as it should..

What does the property “Nonatomic” mean?

http://stackoverflow.com/questions/821692/what-does-the-property-nonatomic-mean

share improve this question Take a look at the Apple Docs . Basically if you say nonatomic and you generate the accessors using @synthesize then if multiple threads try to change read the property at once badness can happen. You can get partially.. doesn't mean the whole object is thread safe but the property reads writes are. Of course if you implement your own accessors rather than using @synthesize I think these declarations do nothing except express your intent as to whether the property..