SubViews中如果根据tag获取到指点的 UIView – viewWithTag

通常我们在初始化页面后，在UIView 上动态的添加多个子 View 时，又没设置类成员变量，在相关的操作中又要使用到那些子视图的控件。这时我们就可以用 viewWithTag 这个方法来获取相关子视图的变量，以方便操作。

类似例子：

UIImageView *leftMsgBg = [[[UIImageViewalloc] initWithFrame:CGRectMake(0, 0, 17, 37)]autorelease];

[leftMsgBg setImage:[UIImageimageNamed:@”bg_camera_left”]];

leftMsgBg.tag = 123;

UIImageView *midMsgBg = [[[UIImageViewalloc] initWithFrame:CGRectMake(17, 0, 85, 37)]autorelease];

// [midMsgBg setImage:[UIImage imageNamed:@"bg_camera"]];

[midMsgBg setBackgroundColor:[UIColorgrayColor]];

midMsgBg.tag = 124;

UIImageView *rightMsgBg = [[[UIImageViewalloc] initWithFrame:CGRectMake(102, 0, 17, 37)]autorelease];

[rightMsgBg setImage:[UIImageimageNamed:@”bg_camera_right”]];

rightMsgBg.tag = 125;

UILabel * lab = [[[UILabelalloc]initWithFrame:CGRectMake(20, 0, 65, 37)]autorelease];

lab.text = @”新消息!!!”;

lab.tag = 126;

[lab setFont:[UIFontboldSystemFontOfSize:14]];

[lab setBackgroundColor:[UIColorclearColor]];

[lab setTextColor:[UIColoryellowColor]];

[self.newMsgBgaddSubview:leftMsgBg];

[self.newMsgBgaddSubview:midMsgBg];

[self.newMsgBgaddSubview:rightMsgBg];

[self.newMsgBgaddSubview:lab];

UIImageView *leftMsgBg = (UIImageView *)[self.newMsgBgviewWithTag:123];

UIImageView *midMsgBg = (UIImageView *)[self.newMsgBgviewWithTag:124];

UILabel * lab = (UILabel *)[self.newMsgBgviewWithTag:126];