iOS获取控制器里面的控件

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    for (int i=0; i<3; i++) {    UILabel *testLabel = [[UILabel alloc]initWithFrame:CGRectMake(((self.view.frame.size.width - 20)/3 + 10) * i, 100, (self.view.frame.size.width - 20)/3, (self.view.frame.size.width - 20)/3)];    testLabel.backgroundColor = [UIColor cyanColor];    testLabel.tag=111+i;    testLabel.textColor = [UIColor purpleColor];    testLabel.text = [NSString stringWithFormat:@"这是第 %d 个",i];    [self.view addSubview:testLabel];            }   //创建 控件UILabel

//    测试按钮    UIButton *testBtn = [UIButton buttonWithType:UIButtonTypeCustom];    testBtn.frame = CGRectMake((self.view.frame.size.width - 20)/3 + 10, 100 + (self.view.frame.size.width - 20)/3, (self.view.frame.size.width - 20)/3, (self.view.frame.size.width - 20)/3);    testBtn.backgroundColor = [UIColor purpleColor];    [testBtn addTarget:self action:@selector(testBtnClick) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:testBtn];

-(void)testBtnClick{    for (int i=0; i<3; i++){                UILabel *tempLabel=(UILabel *)[self.view viewWithTag:111+i];        tempLabel.font=[UIFont systemFontOfSize:12.0];        tempLabel.text = [NSString stringWithFormat:@"This is %d",i];        tempLabel.textColor = [UIColor redColor];        tempLabel.textAlignment = NSTextAlignmentCenter;            }//取出 控件UILabel    }

//扩展：UIButton *btn1 = (UIButton *)[myView viewWithTag:1];UILabel *Label = (UILabel *)[myView viewWithTag:2];UITextView *TextView = (UITextView *)[myView viewWithTag:3];

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