iOS开发从入门到精通--XIB使用，登陆界面小试牛刀

XIB使用，登陆界面小试牛刀

创建一个新的视图控制器，具体操作参见点击查看

在创建好的VCRoot.xib里面拖动需要的控件，并拖动给相应的控件添加属性，给登陆按钮添加事件。

VCRoot.h文件里面：

#import <UIKit/UIKit.h>

@interface VCRoot : UIViewController

//IBOutlet表示从xib中创建的
@property (weak, nonatomic) IBOutlet UITextField *mName;

@property (weak, nonatomic) IBOutlet UITextField *mPassword;

@property (weak, nonatomic) IBOutlet UIButton *mLogin;

//以上@property都是设置的属性
//下面这个是函数事件
- (IBAction)pressLogin:(id)sender;

@end

VCRoot.m文件里面：

#import "VCRoot.h"

@interface VCRoot ()

@end

@implementation VCRoot

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (IBAction)pressLogin:(id)sender {
    NSString * name = @"jack";
    NSString * pass = @"123456";

    //判断是否正确，并弹出对话框提示
    if([_mName.text isEqual:name] && [_mPassword.text isEqual:pass]){
        UIAlertView * alert =[[UIAlertView alloc]initWithTitle:@"提示" message:@"用户名和密码正确，登陆成功" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];
        [alert show];
    }else{
        UIAlertView * alert =[[UIAlertView alloc]initWithTitle:@"提示" message:@"用户名和密码不正确，请重新输入" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];
        [alert show];
    }
}

//点击空白处，收回键盘
-(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [_mName resignFirstResponder];
    [_mPassword resignFirstResponder];
}




@end