UIScrollView *weatherBack = [[UIScrollView alloc]
	initWithFrame:CGRectMake(100, 100, 100, 139)];
 //背景色   
[weatherBack setBackgroundColor:[UIColor colorWithRed:
	255 green:0 blue:0 alpha:0.5]];
//滚动范围
[weatherBack setContentSize:CGSizeMake(421, 139)];
 //放入view  
 [[self view]addSubview:weatherBack]; 
//addsubview会自动retrain，所以这里要四方
[weatherBack release];

 UILabel* weekL = [[UILabel alloc] initWithFrame:
	CGRectMake(5, 3, 50, 30)];            
[weekL setText:@”星期三”];            
[weekL setFont:[UIFont fontWithName:
	@"Helvetica-Bold" size:16]];            
[weekL setBackgroundColor:[UIColor colorWithRed:
	0 green:0 blue:0 alpha:0]];            
[weekL setTextColor:[UIColor colorWithRed:
	255 green:0 blue:0 alpha:0.9]];
//将label添加到父节点中            
[text addSubview:weekL];
[weekL release];

//新建一个按钮
UIButton* testB = [[UIButton alloc] initWithFrame:
	CGRectMake(75, 85, 80, 20)];            
[testB setTitle:@"test" forState:UIControlStateNormal];
//将[self testButton]方法 绑定到UIControlEventTouchUpInside
[testB addTarget:self action:@selector(testButton:)
	forControlEvents:UIControlEventTouchUpInside];            
[text addSubview:testB];            
[testB release];

//事件处理方法
-(IBAction)testButton:(id)sender{    
	UIAlertView *alert = [[UIAlertView alloc]initWithTitle:
		@"hello" message:nil delegate:self
 		cancelButtonTitle:@"取消" 			
		otherButtonTitles:@"确定",
		nil];   
	[alert show];    
	[alert release];
}