iOS 局部變量 setTag后可在別的地方調用 viewWithTag

//比如在某個方法里設置后
UITextField* testFild=[[UITextField alloc] initWithFrame:CGRectMake(0, 48, 200, 200)];
    testFild.text = @"qingjoin";
    testFild.tag = bbbb;
    [self.view addSubview:testFild];


//在另一個方法里面也可以得到這個值 

UITextField *t = (UITextField*)[self.view viewWithTag:bbbb];
    NSLog(@"ttfftf:%@",t.text);