iOS 复制功能的实现

UIPasteboard *pab = [UIPasteboard generalPasteboard];
        
        NSString *string = @"测试";
        
        [pab setString:string];
        
        if (pab == nil) {
            [MBProgressHUD showError:@"复制失败"];
            
        }else
        {
            [MBProgressHUD showSuccess:@"已复制"];

        }