1.实现手机震动效果，代码如下：

需要加入AudioToolbox.framework框架，并倒入头文件#import

- (void)viewDidLoad{    [super viewDidLoad];    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [btn setTitle:@"点击" forState:UIControlStateNormal];    btn.frame = CGRectMake(100, 100, 200, 50);    [btn addTarget:self action:@selector(shake:)     forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];// Do any additional setup after loading the view, typically from a nib.}- (void)shake:(id)sender{    AudioServicesPlayAlertSound(kSystemSoundID_Vibrate); //kSystemSoundID_Vibrate系统震动}

注意：ipod是不支持震动的。