1.動態(tài)變量控制

1> 、 首先創(chuàng)建一個Person類

.h文件

.m文件

2>、創(chuàng)建VC實現(xiàn)動態(tài)變量控制

#import "oneViewController.h"#import "Person.h"#import@interface oneViewController ()

@property (weak, nonatomic) IBOutlet UITextField *textfield;

@property (nonatomic, strong) Person *person;

@end

@implementation oneViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.person = [Person new];

_person.name = @"xiaoming";

NSLog(@"XiaoMing first answer is %@",self.person.name);

}

- (void)sayName

{

unsigned int count = 0;

Ivar *ivar = class_copyIvarList([self.person class], &count);//count獲取Person的屬性個數(shù)，為2；

for (int i = 0; i<count; i++){

Ivar var = ivar[i];

const char *varName = ivar_getName(var);//獲取屬性名稱

NSString *proname = [NSString stringWithUTF8String:varName];//C字符串轉(zhuǎn)換

if ([proname isEqualToString:@"_name"]) {? //這里別忘了給屬性加下劃線，通過屬性名稱

object_setIvar(self.person, var, @"daming");//object_setIvar(類名, 屬性名稱, 變更后的名稱)

break;

}

}

NSLog(@"XiaoMing change name? is %@",self.person.name);//已成功通過runtime更改屬性的值

self.textfield.text = self.person.name;

}

3>、效果如下：