原文地址
http://blog.csdn.net/lengshengren/article/details/16886915
//唯一静态变量key
static const char associatedkey;
static const char associatedButtonkey;
- (IBAction)sendAlert:(id)sender
{
NSString *message =@"我知道你是按钮了";
UIAlertView *alert = [[UIAlertViewalloc]initWithTitle:@"提示"message:@"我要传值·" delegate:selfcancelButtonTitle:@"确定" otherButtonTitles:nil];
alert.delegate =self;
[alert show];
//#import <objc/runtime.h>头文件
//objc_setAssociatedObject需要四个参数：源对象，关键字，关联的对象和一个关联策略。
//1 源对象alert
//2 关键字 唯一静态变量key associatedkey
//3 关联的对象 sender
//4 关键策略 OBJC_ASSOCIATION_RETAIN_NONATOMIC
objc_setAssociatedObject(alert, &associatedkey, message,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
objc_setAssociatedObject(alert, &associatedButtonkey, sender,OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
//通过 objc_getAssociatedObject获取关联对象
NSString *messageString =objc_getAssociatedObject(alertView, &associatedkey);
UIButton *sender = objc_getAssociatedObject(alertView, &associatedButtonkey);
_labebutton.text = [[sendertitleLabel]text];
_ThisLabel.text = messageString;
//使用函数objc_removeAssociatedObjects可以断开所有关联。通常情况下不建议使用这个函数，因为他会断开所有关联。只有在需要把对象恢复到“原始状态”的时候才会使用这个函数。
}
demo http://download.csdn.net/detail/lengshengren/6594365