</pre>1、新建一個UIButton<p></p><p></p><pre name="code" class="objc">    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
    [btn setTitle:@"click me" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
 

-(void)btnClick:(id)sender{
    UIPasteboard *copy = [UIPasteboard generalPasteboard];
    [copy setString:scannerPassWord];
    if (copy == nil || [scannerPassWord isEqualToString:@""]==YES) 		{    [MBProgressHUD showError:@"copy Fail" toView:self.view ];
    }else{
        [MBProgressHUD showSuccess:@"copy Success" toView:self.view];
    }
}