C 函数和对 Objective-C 实例变量的访问
我有一个在 .h 中声明的属性
@property (nonatomic, assign) int timeSig_Numerator;
，以及在 .h 中声明的实例变量，如
int mTimeSig_Numerator;
.m 我合成
@synthesize timeSig_Numerator = mTimeSig_Numerator;
的在综合之前声明的 C 函数，需要使用 mTimeSig_Numerator。使实例变量对我的 C 函数可见而不将其作为函数参数传递的最佳方法是什么？
I have an a property declared in .h as
@property (nonatomic, assign) int timeSig_Numerator;
and an instance variable declared in the .h as
int mTimeSig_Numerator;
in the .m I synthesize with
@synthesize timeSig_Numerator = mTimeSig_Numerator;
I have a C function declared before the synthesize and need to use mTimeSig_Numerator. what is the best way to make the instance variable visible to my C function without passing it in as a function argument?
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由于
mTimeSig_Numerator是一个实例变量，因此类的每个实例都有自己的mTimeSig_Numerator。由于 C 函数与任何给定的类/类实例解耦，它如何知道应该从哪个实例获取mTimeSig_Numerator？您的 C 函数需要一个包含特定实例中的
mTimeSig_Numerator值的参数，或者一个指向实例本身的参数，或者一些其他机制来告诉函数应该使用哪个特定实例/实例变量。Since
mTimeSig_Numeratoris an instance variable, each instance of your class has its ownmTimeSig_Numerator. As a C function is decoupled from any given class/class instance, how would it know from which instance it should obtainmTimeSig_Numerator?Your C function needs either an argument containing the value of
mTimeSig_Numeratorin a specific instance, or an argument pointing to the instance itself, or some other mechanism that tells the function which specific instance/instance variable it should use.