使用了一阵RAC确实在很多方面非常方便，使程序逻辑更加清晰了。
比如接受通知的方法直接可以写在block中，RAC中的通知不需要remove observer，因为在rac_add方法中他已经写了remove：
@weakify(self)
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"NotificationRefreshHotTopic" object:nil] subscribeNext:^(NSNotification *notification) {
@strongify(self)
[self.hotCategoryEventsViewController.model forceReload];
[self.favCategoryEventsViewController.model forceReload];
}];
对变量的改变赋值变得方便：
RAC(badgeView, badgeText) = [RACObserve(app.user.currentUser, unReadCount) map: ^id (NSNumber *number) {
return [number isEqualToNumber:@(0)] ? @"" : [number stringValue];
}];
对多个接口请求后统一返回的处理也很便捷：
@weakify(self)
[[RACSignal combineLatest:@[[self fetchHomeCards], [self fetchDiamongCardStatus],[self fetchMCPeriods]]] subscribeNext: ^(RACTuple *x) {
@strongify(self)
BINGO_RESP_HOME_ITEMS *cardsResp = x.first;
STATUS_RESP_CHECKIN_STATUS *statusResp = x.second;
RECORD_RESP_MC_PERIODS_LATEST *MCPeriods = x.third;
[self storeSignInStateWithData:x.second];
[self handleHomeCardsData:cardsResp statusData:statusResp];
self.mcData = [self getMCData:MCPeriods.mc_latest];
self.mcSummary = MCPeriods.mc_summary;
} error: ^(NSError *error) {
@strongify(self)
[[BHLoadingHUD sharedInstance] hidden];
[self didFailed];
} completed: ^{
@strongify(self)
[[BHLoadingHUD sharedInstance] hidden];
[self didReloaded];
}];
对一个按钮点击后弹出alert，点击后的逻辑都可以在一段函数里完成。
_qingNiuView.unbindButton.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"是否解绑智能秤？"
message:nil
delegate:nil
cancelButtonTitle:@"取消"
otherButtonTitles:@"确定", nil];
[[alertView rac_buttonClickedSignal] subscribeNext:^(NSNumber *buttonIndex) {
if ([buttonIndex integerValue] == 0) {
//Do Nothing
}else{
[[PXQingNiuManager sharedInstance]unbindDevice];
self.qingNiuView.tryButton.hidden = NO;
self.qingNiuView.unbindButton.hidden = YES;
self.qingNiuView.alreadyBindLabel.hidden = YES;
self.qingNiuView.title.text = @"拥有智能秤";
self.qingNiuView.subTitle.text = @"体验更便捷的记录方式";
}
}];
[alertView show];
return [RACSignal empty];
}];
RAC是一个值得深入学习的好框架。