iOS runtime动态变量控制

1.动态变量控制

1> 、 首先创建一个Person类

.h文件 .m文件

2>、创建VC实现动态变量控制

#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获取Person的属性个数，为2；

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

Ivar var = ivar[i];

const char *varName = ivar_getName(var);//获取属性名称

NSString *proname = [NSString stringWithUTF8String:varName];//C字符串转换

if ([proname isEqualToString:@"_name"]) {  //这里别忘了给属性加下划线，通过属性名称

object_setIvar(self.person, var, @"daming");//object_setIvar(类名, 属性名称, 变更后的名称)

break;

}

}

NSLog(@"XiaoMing change name  is %@",self.person.name);//已成功通过runtime更改属性的值

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

}

3>、效果如下：