dataSource not available with xCode version 7.3

[declareerror]

After updated xCode latest version (7.3). There is an error with core plot datasource.
(Previous version its worked.)

datasource not available

this is original
@property (nonatomic, readwrite, cpt_weak_property) __cpt_weak id<CPTPlotDataSource> dataSource;
and i just remove __cpt_weak it worked.
@property (nonatomic, readwrite, cpt_weak_property) id<CPTPlotDataSource> dataSource;
i don't know can i remove __cpt_weak.
@eskroch

[eskroch]

What version of Core Plot are you using? The latest version has this declaration:

 @property (nonatomic, readwrite, cpt_weak_property, nullable) cpt_weak id<CPTPlotDataSource> dataSource;

Note cpt_weak vs. __cpt_weak.

[declareerror]

coreplot 2.0 downloades from release

[euroboy]

Same problem. version 2.0, XCode 7.3

[declareerror]

#if CPT_SDK_SUPPORTS_WEAK #define __cpt_weak #define cpt_weak_property weak #else #if __clang__ && (__clang_major__ >= 3) #define __cpt_weak __unsafe_unretained #else #define __cpt_weak #endif #define cpt_weak_property assign #endif

i modified your code with my code its worked. but i don't this is the best way to fix this problem.
and this is dataSource property
@property (nonatomic, readwrite, cpt_weak_property) __cpt_weak id<CPTPlotDataSource> dataSource;
@eskroch

[eskroch]

Make sure the app is pointed at the right headers. The 2.0 release has the new declaration (with out the leading underscores) I posted above. Is this iOS or Mac? Are you using the release package or building from source?

[declareerror]

I used IOS version. using from release package. Still have an error.

Here is CPTDefinitions.h screen short.

Link binary in my project

Data source property

Build error

Do you have any ideas what wrong? Thank you.
@eskroch

[eskroch]

The headers are right now. Where are those build errors? In your app? Make sure those files import the Core Plot headers (CorePlot-CocoaTouch.h).

[declareerror]

I imported already.

There is no dataSource property when i try to access its.

My Xcode project created by appcelerator studio for create new module.
@eskroch

[malikmani]

I am also facing this issue 'dataSource is unavailable' due to the ARC is disabled in my Project.

So If change this original line (CPTDefiniations.h):
#define cpt_weak __weak
to:
#define cpt_weak
It compiled and worked fine.Is this the correct way to resolve this issue?

CorePlot v2.0 is currently been used in my project.

[eskroch]

Weak properties require automatic reference counting. Turning on ARC in the files that reference any Core Plot weak properties will eliminate the error.

I know how, but I'm not sure if I can safely turn off the weak setting when compiling client apps without ARC. I need to research that further.

[eskroch]

Research info: Mike Ash has a good overview of ARC.

[gyratorycircus]

At least for the dataSource property, it doesn’t look like the cpt_weak is serving a purpose. If the ivar were explicitly defined, then it would be necessary to prepend the ivar with a __weak to use with a weak property. But since its synthesized, the ivar will automatically be created as weak. Actually, Mike Ash also discusses this in the Properties section of the article. I've also never seen __weak used at that location in the property declaration -- is this allowed?

[eskroch]

It may be redundant, but it's obviously allowed. Core Plot has been around a long time. cpt_weak may be a holdover from before we could use automatically synthesized ivars.

The big unanswered question I have is how does non-ARC client code deal with a weak property. Since Core Plot is compiled with ARC, these are zeroing weak references. Non-ARC code will see them as unsafe_unretained which is similar, except the compiler won't expect the automatic zeroing behavior which could cause problems in optimized code.

[gyratorycircus]

While it may be allowed, its redundant in the property declaration, and causing a compiler error. Removing the cpt_weak corrects the error and does not change the memory management of a property with a synthesized ivar.

[euroboy]

@eskroch I don't see this fix after installing Core Plot via CocoaPods (pod 'CorePlot', '~> 2.0').
How to get latests commits via pods? Thanks.

[iDevelopper]

Why some users like me does not issue this problem? Xcode 7.3 (pod 'CorePlot', '~> 2.0') too.

[eskroch]

Use this line in the pod file to get the latest code from the Master branch:

pod 'CorePlot', :git => 'https://github.com/core-plot/core-plot.git'