如何创建模式窗口

常用模式窗口来显示一些临时需要显示的信息，那么它该如何创建呢？

- (void)closeLogOnPane{

[self dismissModalViewControllerAnimated:YES]; //关闭已经打开的模式窗口

[[NSNotificationCenter defaultCenter] removeObserver:self

name:@"NotificationCloseLogOnPane"

object:[self modalViewController]];

}

- (IBAction)ShowLogOnPane:(id)sender{

LogOnController *logOnCtrl = [[LogOnController alloc] init]; //要显示的模式窗口控制器

//保存要显示的模式窗口的大小,因为用[self presentModalViewController: animated:]显示出来的模式窗口的默认大小一般

//不是我们想要得

CGSize logOnPaneSize = logOnCtrl.view.frame.size;

logOnCtrl.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; //淡入淡出的效果

logOnCtrl.modalPresentationStyle = UIModalPresentationFormSheet;

[self presentModalViewController:logOnCtrl animated:YES];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(closeLogOnPane)

name:@"NotificationCloseLogOnPane"

object:logOnCtrl];

//定义模式窗口显示的位置，要在父视图中定义才有用

logOnCtrl.view.superview.center = CGPointMake(502, 384);

//定义模式窗口大小，要在父视图中定义才有用

logOnCtrl.view.superview.bounds = CGRectMake(0, 0, logOnPaneSize.width, logOnPaneSize.height);

[self presentModalViewController:logOnCtrl animated:YES];

[logOnCtrl release];

}