iOS 局部变量 setTag后可在别的地方调用 viewWithTag

//比如在某个方法里设置后

UITextField* testFild=[[UITextField alloc] initWithFrame:CGRectMake(0, 48, 200, 200)];

testFild.text = @"qingjoin";

testFild.tag = bbbb;

[self.view addSubview:testFild];

//在另一个方法里面也可以得到这个值

UITextField *t = (UITextField*)[self.view viewWithTag:bbbb];

NSLog(@"ttfftf:%@",t.text);