iOS第五章控件和动作(3)

//通过代码创建一个 Button

roundedButtonType= [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

//设置按钮的位置和尺寸,前两个参数设置 顶点坐标，后两个参数设置 宽、高

roundedButtonType.frame = CGRectMake(50.0, 250.0, 88.0  , 48.0);

//设置按钮的标题和状态

[roundedButtonType setTitle:@"Rounded" forState:UIControlStateNormal];

//设置按钮的背景颜色

roundedButtonType.backgroundColor = [UIColor clearColor];

//设置用户对 按钮进行何种操作，处理按钮事件的操作(回调函数)

[roundedButtonType addTarget:self

                     action:@selector(action:)

            forControlEvents:UIControlEventTouchUpInside];

//设置按钮的编号，便于区分多个按钮

roundedButtonType.tag = 2;

需要单独为按钮事件处理编写方法，一般都叫 xxxAction:

- (void)action:(id)sender

{

    //创建一个弹出提示框，

   UIAlertView *alert = [[UIAlertView alloc]

             initWithTitle:@"提示标题"

             message:@"通过纯编码实现的按钮处理方法"

              delegate:self

             cancelButtonTitle:@"OK"

             otherButtonTitles: nil];

   //显示弹出提示框

   [alert show];

}

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自定义按钮

(1)创建带有图片的按钮

[myButton setImage:[UIImageimageNamed:@"myButtonImage.png"]

                   forState:UIControlStateNormal];

6、控制控件-开关 UISwitch

创建开关

初始化

CGRect switchRect = CGRectMake(120,50,0,0);

UISwitch *mySwitch = [[UISwitch alloc]initWithFrame:switchRect];

添加事件处理

[mySwitch addTarget: self

                        action:@selector(switchAction:)

      forControlEvents: UIControlEventValueChanged];

切换开关

[mySwitch setOn:YES animated:YES];

修改开关外观

获得开关的两个Label