IOS custom statusBar 思路

 

/// show the custom statusBar//- (void)btn1:(id)sender{    if(self.win && self.win.frame.origin.y == 0)        return;        if(self.win == nil)    {        self.win = [[UIWindow alloc] initWithFrame:CGRectMake(0, -20, 320, 20)];        self.win.windowLevel = UIWindowLevelAlert;        self.win.backgroundColor = [UIColor redColor];    }    [self.win makeKeyAndVisible];        // show it with animation    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:.3];    self.win.frame=CGRectMake(0,0,320,20);    [UIView commitAnimations];}/// hide it://- (void)btn2:(id)sender{    if(self.win == nil || (self.win && self.win.frame.origin.y == -20))        return;        [UIUGetMainWindow() makeKeyAndVisible];// MainWindow: [[[UIApplication sharedApplication] windows] objectAtIndex:0].        [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:.3];    self.win.frame=CGRectMake(0,-20,320,20);    [UIView commitAnimations];}