KVC练习

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end@interface score : NSObject{@private    NSString* scoreName;    float scoreValue;}-(instancetype)init;@end@interface person : NSObject{@private    NSString* name;    NSInteger age;}-(instancetype) initWithName:(NSString*) AName;@end@interface student : person@property (retain, readwrite) NSMutableArray* ScoreInfos;-(instancetype) initWithName:(NSString*) AName;@end

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    /*valueforkey*/    person* p = [[person alloc] initWithName:@"hello"];    NSLog(@"%@",[p valueForKey:@"name"]);        NSString* sValue = @"world";    NSError* err = nil;    if ([p validateValue:&sValue forKey:@"name1" error:&err]) {        [p setValue:@"world" forKey:@"name"];        NSLog(@"%@",[p valueForKey:@"name"]);    }            score* c1 = [[score alloc] init];    [c1 setValue:@"数学" forKey:@"scoreName"];    [c1 setValue:@"94" forKey:@"scoreValue"];    score* c2 = [[score alloc] init];    [c2 setValue:@"语文" forKey:@"scoreName"];    [c2 setValue:@"90" forKey:@"scoreValue"];    score* c3 = [[score alloc] init];    [c3 setValue:@"英语" forKey:@"scoreName"];    [c3 setValue:@"88" forKey:@"scoreValue"];        student* s = [[student alloc]initWithName:@"xiaoming"];    [s.ScoreInfos addObject:c1];    [s.ScoreInfos addObject:c2];    [s.ScoreInfos addObject:c3];        NSLog(@"共%@门课.最高分:%f,最低分:%f,平均分:%f,总分:%f",          [s valueForKeyPath:@"ScoreInfos.@count"],          [[s valueForKeyPath:@"[e-mail]"] floatValue],          [[s valueForKeyPath:@"[e-mail]"] floatValue],          [[s valueForKeyPath:@"[e-mail]"] floatValue],          [[s valueForKeyPath:@"[e-mail]"] floatValue]);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];}@end@implementation person-(BOOL)validateValue:(inout __autoreleasing id *)ioValue forKey:(NSString *)inKey error:(out NSError *__autoreleasing *)outError{    return [inKey isEqualToString:@"name1"]?NO:YES;}-(instancetype)init{    if (self = [super init]) {        name = @"no name";    }    return self;}-(instancetype)initWithName:(NSString *)AName{    if (self = [super init]) {        name = AName;    }    return self;}@end@implementation score/*在类中如果不定义它，就不能调用，不清楚原因～*/-(instancetype)init{    if (self = [super init]) {        return self;    }    return  self;}@end@implementation student-(instancetype)initWithName:(NSString *)AName{    if (self = [super initWithName:AName]) {        self.ScoreInfos = [[NSMutableArray alloc] initWithCapacity:3];    }    return  self;}@end

完全利用了运行时类型信息rtti的特性，查找的方式没有研究，可参考http://www.cnblogs.com/jy578154186/archive/2013/02/27/2935413.html