isa class superclass metaclass

http://www.cnblogs.com/feng9exe/p/7232915.html

Note: 其实这里的难点就在于对 和 的区分。

• .class 当 target 是 Instance 则返回 Class，当 target 是 Class 则返回自身
• object_getClass 返回 指针的指向

ViewController: 0x10deee650, ViewController, 0

ViewController: 0x10deee678, NSObject, 1

NSObject: 0x10ef8cee8, NSObject, 1

NSObject: 0x10ef8cee8, NSObject, 1

ViewController

UIViewController

UIResponder

NSObject

ViewController: 0x10deee650, ViewController, 0

ViewController: 0x10deee650, ViewController, 0

Class currentClass = object_getClass(self);

Class nextClass = object_getClass(currentClass);

Class superClass = class_getSuperclass(currentClass);

Class xClass = self.class;

int k = 0;

do {

NSLog(@"%@:\t%p,\t%s,\t%zd",NSStringFromClass(currentClass),currentClass,object_getClassName(currentClass),class_isMetaClass(currentClass));

currentClass = nextClass;

nextClass = object_getClass(currentClass);

}while (k++ < 4);

NSLog(NSStringFromClass(self.class));

while (superClass != NULL) {

NSLog(NSStringFromClass(superClass));

superClass = class_getSuperclass(superClass);

}

k = 0;

do {

NSLog(@"%@:\t%p,\t%s,\t%zd",NSStringFromClass(xClass),xClass,object_getClassName(xClass),class_isMetaClass(xClass));

xClass = xClass.class;

//nextClass = object_getClass(currentClass);

}while (k++ < 3);