//在APPDelegate.h中，即项目的入口部分
//didFinishLaunchingWithOptions该方法表示APP启动完毕，接下来进入自定义界面
//如下MyViewController是自定义的类，即一个界面实现UIViewController接口
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
MyViewController *myController = [[MyViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:myController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}//MyViewController.h
//定义四个控件
@interface MyViewController : UIViewController
@property (strong, nonatomic) UILabel *labelNum;
@property (strong, nonatomic) UILabel *labelPwd;
@property (strong, nonatomic) UITextField *fieldNum;
@property (strong, nonatomic) UITextField *fieldPwd;
@end
//MyViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.labelNum = [[UILabel alloc] init];
self.labelNum.frame = CGRectMake(100, 100, 50, 20);
self.labelNum.text = @"Num: ";
self.fieldNum = [[UITextField alloc] init];
self.fieldNum.frame = CGRectMake(150, 100, 100, 20);
self.fieldNum.borderStyle = UITextBorderStyleRoundedRect;
self.labelPwd = [[UILabel alloc] init];
self.labelPwd.frame = CGRectMake(100, 150, 50, 20);
self.labelPwd.text = @"Pwd: ";
self.fieldPwd = [[UITextField alloc] init];
self.fieldPwd.frame = CGRectMake(150, 150, 100, 20);
self.fieldPwd.borderStyle = UITextBorderStyleRoundedRect;
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(100, 200, 80, 20);
btn.backgroundColor = [UIColor grayColor];
[btn setTitle:@"login" forState:UIControlStateNormal];
//设置按钮监听事件，监听方法为login
[btn addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchDown];
[self.view addSubview:self.labelNum];
[self.view addSubview:self.fieldNum];
[self.view addSubview:self.labelPwd];
[self.view addSubview:self.fieldPwd];
[self.view addSubview:btn];
}//页面跳转，并传递参数
-(void) login{
NSLog(@"login");
NSString *num = self.fieldNum.text;
NSString *pwd = self.fieldPwd.text;
if([num isEqualToString:@"123"] == TRUE){
NSLog(@"yes");
//初始化要跳转的界面
MainViewController *mm = [[MainViewController alloc] init];
//把账号密码传递到下个界面
[mm initData:num two:pwd];
//开始跳转
[self.navigationController pushViewController:mm animated:FALSE];
}else{
NSLog(@"error");
}
}//MainViewController.h
@interface MainViewController : UIViewController //@property( nonatomic) NSString //传递两个参数a、b NSString 类型 -(void) initData:(NSString *) a two:(NSString *) b; @end
//接收参数，并保存
-(void) initData:(NSString *) a two:(NSString *) b{
self.num = a;
self.pwd = b;
NSLog(@"%@,%@", self.num, self.pwd);
}//效果图
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