isa方法列表測試(含Demo)

以下這個圖我們都很熟悉，但是理論總是生澀的，我用demo幫助大家理解一下：

目的：

一.測試父類子類中，函數 的關係

二.測試父類子類中，函數調用 的關係

Demo下載

一.測試父類子類中，函數 的關係

三個類：ParentObject : NSObject；AObject : ParentObject；BObject :AObject

@interface ParentObject : NSObject

- (void)printObj;

@end

#import "ParentObject.h"

@implementation ParentObject

- (void)printObj{

    NSLog(@"ParentObject--%s",__FUNCTION__);

}

@end

@interface AObject :ParentObject

@end

#import "AObject.h"

@implementation AObject

@end

#import "AObject.h"

@interface BObject : AObject

@end

#import "BObject.h"

@implementation BObject

- (void)printObj{

    [superprintObj];

    NSLog(@"BObject--%s",__FUNCTION__);

}

@end

- (void)method:(id)obj{

    Class currentClass=[obj class];

    while (currentClass) {

        unsignedint methodCount;

        Method *methodList =class_copyMethodList(currentClass, &methodCount);

        unsignedint i =0;

        for (; i < methodCount; i++) {

            NSLog(@"%@ ========== %@", [NSStringstringWithCString:class_getName(currentClass)encoding:NSUTF8StringEncoding], [NSStringstringWithCString:sel_getName(method_getName(methodList[i]))encoding:NSUTF8StringEncoding]);

        }

        

        free(methodList);

        

        currentClass = class_getSuperclass(currentClass);

        if ([[NSStringstringWithFormat:@"%@",currentClass]isEqualToString:@"NSObject"]) {

            currentClass = nil;

        }

    }

}

#pragma mark - viewDidLoad

- (void)testMethod{

    [selftestPObj];

    

    NSLog(@" ==============1================ ");

    

    [selftestAObj];

    

    NSLog(@" ==============2================ ");

    

    [selftestBObj];

}

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    [self testMethod];

}

log:

2016-08-25 16:57:58.110 SubObjectDemo[84610:17663247] ParentObject =====方法===== printObj

2016-08-25 16:57:58.110 SubObjectDemo[84610:17663247]  ==============1================ 

2016-08-25 16:57:58.110 SubObjectDemo[84610:17663247] ParentObject =====方法===== printObj

2016-08-25 16:57:58.111 SubObjectDemo[84610:17663247]  ==============2================ 

2016-08-25 16:57:58.111 SubObjectDemo[84610:17663247] BObject =====方法===== printObj

2016-08-25 16:57:58.111 SubObjectDemo[84610:17663247] ParentObject =====方法===== printObj

說明：向上查找的關係

ParentObject中有printObj這個方法；然而，AObject的方法列表中，沒有printObj這個方法；

A之所以可以調用這個方法，一定不是因爲自己本身有這個方法；是因爲，根據isa找自己的方法沒有找到，故調用自己的父類的；

二.測試父類子類中，函數調用 的關係

三個類：MethodObject : NSObject； MAObject :MethodObject；MBObject :MAObject

#import <Foundation/Foundation.h>

@interface MethodObject : NSObject

@end

#import "MethodObject.h"

@implementation MethodObject

@end

#import "MethodObject.h"

@interface MAObject : MethodObject

- (void)testOrder;

@end

#import "MAObject.h"

@implementation MAObject

- (void)testOrder{

    NSLog(@"AObject1--%s",__FUNCTION__);

    [selftestOrder2];//重點1

}

- (void)testOrder2{//重點2

    NSLog(@"AObject2--%s",__FUNCTION__);

}

@end

#import "MAObject.h"

@interface MBObject : MAObject

@end

#import "MBObject.h"

@implementation MBObject

- (void)testOrder{

    NSLog(@"BObject1-開始-%s",__FUNCTION__);

    [supertestOrder];

    NSLog(@"BObject1-結束-%s",__FUNCTION__);

}

- (void)testOrder2{//重點3

    NSLog(@"BObject2--%s",__FUNCTION__);

}

@end

#pragma mark - testSubMethod

- (void)testSubMethod{

    MBObject *p = [[MBObjectalloc]init];

    [p testOrder];

}

log:

2016-08-25 17:05:05.946 SubObjectDemo[84809:17676692] BObject1-開始--[MBObject testOrder]

2016-08-25 17:05:05.947 SubObjectDemo[84809:17676692] AObject1---[MAObject testOrder]////重點1

2016-08-25 17:05:05.947 SubObjectDemo[84809:17676692] BObject2---[MBObject testOrder2]////重點3

2016-08-25 17:05:05.947 SubObjectDemo[84809:17676692] BObject1-結束--[MBObject testOrder]

說明：向下查找的關係

請大家注意，本例第二行與第三行中調用的是重點1和重點3；沒有調用與重點1在同一個類中的重點2！

這是一種特殊情況：SuperClass調用的方法，首先在子類中去查找；如果有則調用子類的；