[基础语法]1.NSObject的几个方法

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Person.h:

#import <Foundation/Foundation.h>@interface Person : NSObject{    @private        NSString *ID;    @protected        NSString *name;    @public        int age;    }@property NSString *ID;@property NSString *name;@property int age;- (NSString*) say;@end

Person.m:

#import "Person.h"@implementation Person@synthesize ID;@synthesize name;@synthesize age;- (NSString*) say{    NSString *str = [[[NSString alloc] init] stringByAppendingFormat:@"id=%@,age=%d,name=%@",ID,age,name];    return str;}@end

Man.h

#import <Foundation/Foundation.h>#import "Person.h"@interface Man : Person- (void) manSay;//男人说@end

Man.m:

#import "Man.h"@implementation Man- (void) manSay{    //NSLog(@"id=%@,age=%d,name=%@",ID,age,name);//id is private    NSLog(@"manSay:age=%d,name=%@",age,name);}@end

main:

#import <Foundation/Foundation.h>#import "Man.h"int main(int argc, const char * argv[]){    @autoreleasepool {                Person *person = [[Man alloc]init];                person.name = @"chenliang";        person.age = 18;        person.ID = @"1";        NSString *str = [person say];        NSLog(str,nil);// 1.id=1,age=18,name=chenliang                //[person manSay];// 2.这里是不可以访问的                Man *man = [[Man alloc]init];        [man manSay];// 3.manSay:age=0,name=(null)                // 4.下面说一下NSObject类的一些方法        BOOL iskindof = [person isKindOfClass:[Man class]];        NSLog(@"person isKindOfClass :%@",iskindof?@"true":@"false");//true                BOOL ismemberof = [person isMemberOfClass:[Man class]];        NSLog(@"person isMemberOfClass :%@",ismemberof?@"true":@"false");//true                BOOL isSubclassOfClass = [[man class] isSubclassOfClass:[person class]];        NSLog(@"person isSubclassOfClass :%@",isSubclassOfClass?@"true":@"false");//true                SEL sel = NSSelectorFromString(@"say");        BOOL resolveClassMethod = [[person class] resolveClassMethod:sel];        NSLog(@"person resolveClassMethod :%@",resolveClassMethod?@"true":@"false");//false                [man performSelector:@selector(manSay)];//调用mancfqjrmanSay方法：manSay:age=0,name=(null)                    }    return 0;}