IOS Custom NavigationItem --写titleView

        //先自己写一个titleView

	UIView *titleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 20)];//allocate titleView

	titleView.backgroundColor=[UIColor blackColor];

	//Create UILable

	UILabel	*titleText = [[UILabel alloc] initWithFrame: CGRectMake(100, 0, 50, 20)];//allocate titleText

	titleText.backgroundColor = [UIColor clearColor];

	[titleText setText:@"Title"];

	[titleView addSubview:titleText];

	[titleText release];//release titleText

	

	//Create Round UIButton

	UIButton *btnNormal = [UIButton buttonWithType:UIButtonTypeRoundedRect];

	[btnNormal setFrame:CGRectMake(0, 0, 40, 20)];

	[btnNormal addTarget:self action:nil forControlEvents:UIControlEventTouchUpInside];

	[btnNormal setTitle:@"Normal" forState:UIControlStateNormal];

	[btnNormal setFont:[UIFont systemFontOfSize:8]];

	[titleView addSubview:btnNormal];

	

	

	//Set to titleView

	 self.navigationItem.titleView = titleView;

	[titleView release];//release titleView

	

	//Custom backgroundImage UIButton

	UIButton *btnCustom = [UIButton buttonWithType:UIButtonTypeRoundedRect];

	[btnCustom setFrame:CGRectMake(0, 0, 32, 32)];

	[btnCustom addTarget:self action:nil forControlEvents:UIControlEventTouchUpInside];

	[btnCustom setTitle:@"CB" forState:UIControlStateNormal];

	[btnCustom setBackgroundImage:[UIImage imageNamed:@"whiteButton.png"] forState:UIControlStateNormal];

	[btnCustom setBackgroundImage:[UIImage imageNamed:@"blueButton.png"] forState:UIControlStateHighlighted];

	//Create UIBarButtonItem with the customed button

	UIBarButtonItem *rightBarButton = [[UIBarButtonItem alloc] initWithCustomView:btnCustom];//allocate rightBarButton

	//Set to rightBarButtonItem

	self.navigationItem.rightBarButtonItem = rightBarButton;

	[rightBarButton release];//release rightBarButton