UISwitch 开关

UISwitch *swt = [[UISwitch alloc] initWithFrame:CGRectMake(0, 30, 100, 50)];    UIImage *on = [UIImage imageNamed:@"smiley_grin_30"];    UIImage *off = [UIImage imageNamed:@"smiley_sad_30"];    //设置on和off图片,7无效    swt.onImage = on;    swt.offImage = off;    [swt setOn:YES animated:YES];    [swt addTarget:self action:@selector(change:) forControlEvents:UIControlEventValueChanged];

- (void)change:(UISwitch *)swt{    //获取开关状态    //swt.isOn == YES == on    //swt.isOn == NO  == off    if (swt.isOn)    {        NSLog(@"开");    }    else    {        NSLog(@"关");    }}