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Can someone tell how we can declare a static variable as part of a Objective C class? I wanted this to track the number of instances I am creating with this Class.
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In both C and Objective-C, a static variable is a variable that is allocated for the entire lifetime of a program. This is in contrast to automatic variables, whose lifetime exists during a single function call; and dynamically-allocated variables like objects, which can be released from memory when no longer used.
Static variables are those variables whose values are shared among all the instance or object of a class. When we define any variable as static, it gets attached to a class rather than an object. The memory for the static variable will be allocation during the class loading time.
The static variables are stored in the data segment of the memory. The data segment is a part of the virtual address space of a program. All the static variables that do not have an explicit initialization or are initialized to zero are stored in the uninitialized data segment( also known as the BSS segment).
A static function in C is a function that has a scope that is limited to its object file. This means that the static function is only visible in its object file. A function can be declared as static function by placing the static keyword before the function name.
Use your class's +initialize method:
@implementation MyClass
static NSUInteger counter;
+(void)initialize {
if (self == [MyClass class]) {
counter = 0;
}
}
@end
(Updated to add if (self == [MyClass class]) conditional, as suggested in comments.)
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