synthesize

Direct access to auto-synthesized instance variables in subclasses?

由 房东的猫 提交于 2019-12-10 17:23:39
问题 For efficiency I want to access the member variable associated with a property in a subclass. If I have a property declared like: @interface Mumbo : NSObject @property (nonatomic) GLKVector3 position; @end In the implementation of Mumbo I can refer to position either as self.position or directly as _position (the default synthesized member variable - I am not using @synthesize). I use the latter for efficiency in some cases to avoid copying structures. However, in subclasses I cannot refer to

override getter only needs @synthesize

由 自古美人都是妖i 提交于 2019-12-07 01:09:23
问题 I want to ovveride getter for lazy instantiation and leave default setter. Do I need @synthesize ? Why ? @interface Foo() @property (strong, nonatomic) NSObject *bar; @end @implementation Foo - (NSObject *)bar { if(!_bar) _bar = [[NSObject alloc] init]; return _bar; } @end Update: I've changed variable and class name, because it was confusing. From Deck and card to Foo and bar. 回答1: No, you only need to explicitly synthesize (to get the synthesized ivar) if you explicitly implement all of the

override getter only needs @synthesize

由 [亡魂溺海] 提交于 2019-12-05 05:33:53
I want to ovveride getter for lazy instantiation and leave default setter. Do I need @synthesize ? Why ? @interface Foo() @property (strong, nonatomic) NSObject *bar; @end @implementation Foo - (NSObject *)bar { if(!_bar) _bar = [[NSObject alloc] init]; return _bar; } @end Update: I've changed variable and class name, because it was confusing. From Deck and card to Foo and bar. No, you only need to explicitly synthesize (to get the synthesized ivar) if you explicitly implement all of the accessor methods (both getter and setter for readwrite properties, just the getter for readonly properties)

Why does Xcode 4 auto-generate a instance variable?

由 ⅰ亾dé卋堺 提交于 2019-12-04 14:01:24
问题 I'm coming from C# development and just started to learn Objective-C and Xcode 4. As far as I understand "@synthesize" is replacing getter/setter methods for properties if you don't need to check/control the values which are being read or written. But why does Xcode 4 create a instance variable for me automatically? Wouldn't this be enough: @synthesize myProperty; instead of: @synthesize myProperty = _myProperty; ? Why would I want to use/have the instance variable instead of the actual

XCode 4.4 Auto @Synthesize failing on an XCode 4.3 Project

由 走远了吗. 提交于 2019-12-04 09:22:42
It's as simple as that. Running Lion. I just upgraded to XCode 4.4 loaded my most recent XCode 4.3 project file commented out one @synthesize line of code and errors abound. :( Verified compiler is set to 'LLVM 4.0'. Then I did the same test but created a new project within XCode 4.4, and voila! Auto @synthesize works within a 4.4 project. Auto @synthesize also seems to work on new properties added to the code. But existing old one generate an error. Anyone else experience this? Any other things I should check for? I really want the auto generation features to work. Thanks. The Error isn't the

self.variableName vs. _variableName vs. @sysnthesize variableName [duplicate]

由 本秂侑毒 提交于 2019-12-03 04:36:45
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: How does an underscore in front of a variable in a cocoa objective-c class work? Note: For the folks digging around trying to understand this, I figured-out the source of my confusion. In the .h, I had: ... @interface myClass : parentClass { className *variableName: } @property (strong, nonatomic) className *variableName; ... This leads to self.variableName and _variableName being two distinct variables in the

Using FOR loop in VHDL with a variable

由 橙三吉。 提交于 2019-12-01 07:38:28
Is there any possible way to create a for loop in the form: for i in 0 to some_var loop // blah,blah end loop; If not, is there any alternative way to create the same loop? Since While loops allows to use variable as the limit, but they are not synthesizeable in my project. Thanks in Advance, Bojan Matovski The variable works just fine for testbench applications. For synthesis you can get the same effect by using a static range and an exit condition. Set the range to be the maximum you will need. for i in 0 to MAX_VALUE loop exit when i = some_var ; // blah,blah end loop; If your synthesis

Using FOR loop in VHDL with a variable

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-01 04:59:38
问题 Is there any possible way to create a for loop in the form: for i in 0 to some_var loop // blah,blah end loop; If not, is there any alternative way to create the same loop? Since While loops allows to use variable as the limit, but they are not synthesizeable in my project. Thanks in Advance, Bojan Matovski 回答1: The variable works just fine for testbench applications. For synthesis you can get the same effect by using a static range and an exit condition. Set the range to be the maximum you

Automatic @property synthesize not working on NSManagedObject subclass

由 坚强是说给别人听的谎言 提交于 2019-11-30 10:39:30
问题 After updating to the newest Version of Xcode 4.5 for iOS6 last night, i get Warnings and Errors like this Property 'mapAnnotation' requires method 'mapAnnotation' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation because of missing @synthesize Statements, and even Errors about unknown iVars if i use them. The thing is, i thought it was not necessary to write these @synthesize statements since the last Xcode Update to 4.5 that came out

Automatic @property synthesize not working on NSManagedObject subclass

由 大城市里の小女人 提交于 2019-11-29 20:59:05
After updating to the newest Version of Xcode 4.5 for iOS6 last night, i get Warnings and Errors like this Property 'mapAnnotation' requires method 'mapAnnotation' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation because of missing @synthesize Statements, and even Errors about unknown iVars if i use them. The thing is, i thought it was not necessary to write these @synthesize statements since the last Xcode Update to 4.5 that came out with Mountain Lion, AND all my projects worked without them before i've updated Xcode last night (i've
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