#import <UIKit/UIKit.h>//加入头文件#import "LTBounceSheet.h"//define文件#define color [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1]@interface RootViewController : UIViewController{    UIView *backView;    LTBounceSheet *sheet;}@end

//点击任何处，弹出sheet-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{        //sheet    sheet = [[LTBounceSheet alloc]initWithHeight:250 bgColor:[UIColor whiteColor]];    sheet.alpha=1;        //背景    backView= [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 600)];    backView.alpha=0.3;    backView.backgroundColor = [UIColor blackColor];    [self.view addSubview:backView];        //提示    UITextView *QuitTextView = [[UITextView alloc]initWithFrame:CGRectMake(46, 13, 233, 38)];    QuitTextView.text = @"退出后不会删除任何历史记录，下次登录依然可以使用本账号.";    QuitTextView.textColor = [UIColor grayColor];    QuitTextView.userInteractionEnabled =NO;    QuitTextView.textAlignment = NSTextAlignmentCenter;    [sheet addView:QuitTextView];        //退出按钮    UIButton *QuitButton = [[UIButton alloc]initWithFrame:CGRectMake(50, 75, 230, 38)];    [QuitButton addTarget:self action:@selector(doClickQuitButton:) forControlEvents:UIControlEventTouchDown];    [QuitButton setTitle:@"退出" forState:UIControlStateNormal];    QuitButton.backgroundColor=[UIColor redColor];    [sheet addView:QuitButton];        //取消按钮    UIButton *CancelButton =[[UIButton alloc]initWithFrame:CGRectMake(50, 125, 230, 38)];    [CancelButton addTarget:self action:@selector(doClickCancelButton:) forControlEvents:UIControlEventTouchDown];    [CancelButton setTitle:@"取消" forState:UIControlStateNormal];    CancelButton.backgroundColor=[UIColor blueColor];    [sheet addView:CancelButton];        [self.view addSubview:sheet];    [sheet show];    }#pragma -mark -doClickActions//退出按钮-(void)doClickQuitButton:(UIButton *)btn{    [sheet hide];    [backView setHidden:YES];    //执行退出的操作}//取消按钮-(void)doClickCancelButton:(UIButton *)btn{    [sheet hide];    [backView setHidden:YES];    //执行取消的操作}