UI_ViewController（视图控制器）

ViewController（视图控制器）

1. 创建视图控制器类
2. 创建自定义视图类
3. 将自定义视图的View替换自带的View
    3.1 引入
    3.2 写属性
    3.3 dealloc
    3.4 重写loadView
4. 设置好页面
    4.1 声明属性
    4.2 dealloc方法
    4.3 创建视图元素，然后添加到页面上
5. 给button绑定事件（Controller里）
    5.1 绑定事件写在 viewDidLoad
    5.2 在viewDidLoad方法下面去实现事件


AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    // 设置window
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    [self.window release];
    
    // 设置根视图控制器
    LoginViewController *loginVC = [[LoginViewController new] autorelease];
    self.window.rootViewController = loginVC;

LoginViewController.m

@interface LoginViewController () <UITextFieldDelegate>
// 在延展里声明私有的属性
// 声明替换掉自带View的自定义View
@property (nonatomic, retain) LoginView *loginView;



@end

@implementation LoginViewController

#pragma mark - 当我们需要设置自定义视图时，需要重写loadView
- (void)loadView
{
    // 1. 创建自定义View
    self.loginView = [[[LoginView alloc] initWithFrame:[UIScreen mainScreen].bounds] autorelease];
    
    // 2. 替换自带的VIew
    self.view = _loginView;
}


#pragma mark - 绑定事件、设置代理、处理逻辑、处理数据
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    // 给button绑定那个事件
    [_loginView.button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
    _loginView.textField.delegate = self;
    
    
 
}


#pragma mark - Button绑定的事件
- (void)buttonAction:(UIButton *)sender
{
    NSLog(@"Button被点击了");
}

#pragma mark - 实现协议的方法
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    
    [textField resignFirstResponder];
    return YES;
}
- (void)dealloc
{
    [_loginView release];
    [super dealloc];
}

@end

LoginView.h

@interface LoginView : UIView


@property (nonatomic, retain) UIButton *button;
@property (nonatomic, retain) UITextField *textField;


@end

LoginView.m

@implementation LoginView
- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor blueColor];
        [self addSubview];
    }
    return self;
    
}

#pragma mark 添加所有的视图元素
- (void)addSubview
{
    // 1. 创建button并添加
    self.button = [UIButton buttonWithType:UIButtonTypeSystem];
    [_button setTitle:@"我是一个Button" forState:UIControlStateNormal];
    _button.frame = CGRectMake(100, 100, 200, 30);
    _button.backgroundColor = [UIColor cyanColor];
    [self addSubview:_button];
    
    
    // 2. 创建textField并添加
    self.textField = [[[UITextField alloc] initWithFrame:CGRectMake(100, 200, 200, 30)] autorelease];
    _textField.borderStyle = UITextBorderStyleRoundedRect;
    [self addSubview:_textField];
    
}


- (void)dealloc
{
    [_button release];
    [_textField release];
    
    [super dealloc];
}


@end