ReactiveCocoa使用记录

来源：互联网发布：linux服务器端口不通编辑：程序博客网时间：2024/05/16 01:17

学习地址：
http://blog.leichunfeng.com
http://blog.csdn.net/xdrt81y/article/details/30624469
http://www.cnblogs.com/thefeelingofsimple/archive/2015/12/02/5013723.html
中文学习资料：
https://github.com/ReactiveCocoaChina/ReactiveCocoaChineseResources
对于一个应用来说，绝大部分的时间都是在等待某些事件的发生或响应某些状态的变化，比如用户的触摸事件、应用进入后台、网络请求成功刷新界面等等，而维护这些状态的变化，常常会使代码变得非常复杂，难以扩展。而 ReactiveCocoa 给出了一种非常好的解决方案，它使用信号来代表这些异步事件，提供了一种统一的方式来处理所有异步的行为，包括代理方法、block 回调、target-action 机制、通知、KVO 等：

// 代理方法[[self    rac_signalForSelector:@selector(webViewDidStartLoad:)    fromProtocol:@protocol(UIWebViewDelegate)]    subscribeNext:^(id x) {        // 实现 webViewDidStartLoad: 代理方法    }];// target-action[[self.avatarButton    rac_signalForControlEvents:UIControlEventTouchUpInside]    subscribeNext:^(UIButton *avatarButton) {        // avatarButton 被点击了    }];// 通知[[[NSNotificationCenter defaultCenter]    rac_addObserverForName:kReachabilityChangedNotification object:nil]    subscribeNext:^(NSNotification *notification) {        // 收到 kReachabilityChangedNotification 通知    }];// KVO[RACObserve(self, username) subscribeNext:^(NSString *username) {    // 用户名发生了变化}];

1.监听UITextField数值赋值ViewModel

RAC(self.loginVM, username) = _textFieldAccount.rac_textSignal;

2.监听ViewModel数值赋值UILabel

RAC(self.labelRoundNumber, text) = RACObserve(self.homePageVM, waitNum);

问题：RAC 和RACOberve的区别？RAC（tagartA，keypathA）是对对象tagartA的keypathA属性进行赋值，RACObserve（tagartB，keypathB）是监听tagartB的keypathB属性的值；

3.监听UITextView控件 text属性

@weakify(self);[self.textViewAdvice.rac_textSignal subscribeNext:^(NSString *content){    @strongify(self);    self.textFieldPlaceholder.hidden = (content && content.length > 0);}];

4.监听UIButton控件 UIControlEventTouchUpInside事件

@weakify(self)[[self.buttonLogin  rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {     @strongify(self)         [MBProgressHUD showHUDAddedTo:self.view                              animated:NO];         [self.loginVM sendLogin]; }];

5.自定义RACSubject消息

@property (nonatomic, strong, readwrite) RACSubject *successLogin;@property (nonatomic, strong, readwrite) RACSubject *failureLogin;- (void)initialize {    _successLogin = [RACSubject subject];    _failureLogin = [RACSubject subject];}

6.消息RACSubject传递

- (void)sendLogin {    NSDictionary *dictParams = @{                                 @"UserName":self.username,                                 @"PassWord":self.password                                 };    @weakify(self);    [WebServiceManager requestLoginWithParams:dictParams                                     andBlock: ^(id data, id error) {                                         @strongify(self);                                         if (error) {                                             return;                                         }                                         if ([data isMemberOfClass:[UserModel class]]) {                                             [self.successLogin sendNext:userModel];                                         }                                         else {                                             [self.failureLogin sendNext:(NSString *)data];                                         }                                     }];}

7.消息RACSubject接收

@weakify(self)[self.loginVM.successLogin subscribeNext:^(UserModel *userModel) {    @strongify(self);    [UserModel userModel:userModel];    [HomePageVC rootViewController];    [MBProgressHUD hideHUDForView:self.view                         animated:YES];}];[self.loginVM.failureLogin subscribeNext:^(NSString *data) {    @strongify(self);    self.textFieldAccount.text = @"";    self.textFieldPassword.text = @"";    kMRCError(data);    [MBProgressHUD hideHUDForView:self.view                         animated:YES];}];

8.监听键盘通知

[[[NSNotificationCenter defaultCenter]  rac_addObserverForName:UIKeyboardWillShowNotification  object:nil] subscribeNext:^(NSNotification *notification) {     NSDictionary *info = [notification userInfo];     NSValue *keyboardFrameValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];     CGRect keyboardFrame = [keyboardFrameValue CGRectValue];     CGFloat height_temp = 195 - (kViewHeight(self.view) - keyboardFrame.size.height - 90) / 2;     [_scrollViewMaster setContentOffset:CGPointMake(0, height_temp)                                animated:YES]; } ];[[[NSNotificationCenter defaultCenter]  rac_addObserverForName:UIKeyboardWillHideNotification  object:nil] subscribeNext:^(NSNotification *notification) {     [_scrollViewMaster setContentOffset:CGPointMake(0, 0)                                animated:YES]; } ];[[NSNotificationCenter defaultCenter] removeObserver:self                                                name:UIKeyboardWillShowNotification                                              object:nil];[[NSNotificationCenter defaultCenter] removeObserver:self                                                name:UIKeyboardWillHideNotification                                              object:nil];

MVVM+RAC

MVVM在功能上其实是Model+View（view、ViewController）+ViewModel，所以与之前不同的地方就是每个ViewController都会有一个与之对应的ViewModel，它处理业务逻辑和网络请求，从而降低ViewController的臃肿。

0 0