关闭程序

-(void)close
{
    [UIView animateWithDuration:1.0f animations:^{
        self.view. window.alpha = 0;
        
        self.view.window.frame = CGRectMake( self.view.window.bounds.size.width/2,self.view.window.bounds.size.height, 0, 0);
    } completion:^(BOOL finished) {
        exit(0);
    }];
}