知識點
- RACSignal與OC對象方法的綁定
- RACSignal與OC對象屬性的綁定
- [RACSignal merge:], Merge操作的使用
- [RACSignal combineLatest: reduce:^id(){}], Combine和reduce操作的使用
- [RACSignal return:nil] 與[RACSignal empty], nil信號和空信號的區別
示例項目功能
- 點擊電子發票 紙質發票 個人 公司四個按鈕 界面作出變化
- 根據四種狀態檢查Textfiled內容是否輸入錯誤
- 輸入錯誤Toast彈出錯誤內容
- 輸入正確Alert彈出確認信息
示例項目地址
github: https://github.com/heeween/RACComand2.git
用到的城市選擇器屬于Jonhory
2017-11-14 13.58.33.gif
構建電子發票 紙質發票 個人 公司四個按鈕的RACCommand對象
// GBInvoiceContentViewModel.m中代碼
self.personalCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal return:@(Invoice_Owner_Personal)];
}];
self.companyCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal return:@(Invoice_Owner_Company)];
}];
self.nonPaperCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal return:@(Invoice_Source_NonPaper)];
}];
self.paperCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal return:@(Invoice_Source_Paper)];
}];
在控制器中將RACCommand對象和按鈕事件綁定
// GBInvoiceContentController.m 中代碼
self.contentView.ownerItemView.personalButton.rac_command = self.viewModel.personalCmd;
self.contentView.ownerItemView.companyButton.rac_command = self.viewModel.companyCmd;
self.sourceView.nonPaperButton.rac_command = self.viewModel.nonPaperCmd;
self.sourceView.paperButton.rac_command = self.viewModel.paperCmd;
將上述四個command的包含的信號合并為source何owner兩個信號
// GBInvoiceContentViewModel.m中代碼
RACSignal *personalSignal = [[self.personalCmd executionSignals] switchToLatest];
RACSignal *companySignal = [[self.companyCmd executionSignals] switchToLatest];
RACSignal *nonPaperSignal = [[self.nonPaperCmd executionSignals] switchToLatest];
RACSignal *paperSignal = [[self.paperCmd executionSignals] switchToLatest];
self.ownerSignal = [RACSignal merge:@[personalSignal,companySignal]];
self.sourceSignal = [RACSignal merge:@[nonPaperSignal,paperSignal]];
分別將source和owner信號綁定對應的view上
// GBInvoiceContentController.m 中代碼
RAC(self.sourceView,type) = self.viewModel.sourceSignal;
RAC(self.confirmView,type) = self.viewModel.sourceSignal;
RAC(self.addressView,type) = self.viewModel.sourceSignal;
RAC(self.contentView,type) = self.viewModel.ownerSignal;
將source和owner兩個信號合并為動畫信號
// GBInvoiceContentViewModel.m中代碼
self.animateSignal = [RACSignal merge:@[self.ownerSignal,self.sourceSignal]];
將動畫信號綁定到控制器的動畫方法
// GBInvoiceContentController.m 中代碼
[self rac_liftSelector:@selector(animatieUpdateSubview:) withSignals:self.viewModel.animateSignal, nil];
/** 動畫子控件 */
- (void)animatieUpdateSubview:(id)obj {
[UIView animateWithDuration:0.3 animations:^{
[self.view layoutIfNeeded];
}];
}
收集控制器中各輸入框的信號,并且綁定到viewmode中發票對象的屬性上
// GBInvoiceContentController.m 中代碼
self.viewModel.companyNameSignal = self.contentView.companyNameItemView.inputField.rac_textSignal;
self.viewModel.taxNumberSignal = self.contentView.taxPayerIDItemView.inputField.rac_textSignal;
self.viewModel.remarkSignal = self.contentView.markField.rac_textSignal;
self.viewModel.receiverSignal = self.addressView.contactNameItemView.inputField.rac_textSignal;
self.viewModel.phoneSignal = self.addressView.contactPhoneItemView.inputField.rac_textSignal;
self.viewModel.regionSignal = self.addressView.contactAddressItemView.inputField.rac_textSignal;
self.viewModel.minAddressSignal = self.addressView.contactAddressDescItemView.inputField.rac_textSignal;
self.viewModel.emailSignal = self.addressView.contactMailItemView.inputField.rac_textSignal;
RAC(self.viewModel.invoice,companyName) = self.viewModel.companyNameSignal;
RAC(self.viewModel.invoice,taxNumber) = self.viewModel.taxNumberSignal;
RAC(self.viewModel.invoice,receiver) = self.viewModel.receiverSignal;
RAC(self.viewModel.invoice,region) = self.viewModel.regionSignal;
RAC(self.viewModel.invoice,minAddress) = self.viewModel.minAddressSignal;
RAC(self.viewModel.invoice,email) = self.viewModel.emailSignal;
在viewmodel中根據source和owner信號,對各個輸入框的信號進行merge和reduce操作,整合成錯誤字符串信號errorStringSignal
// GBInvoiceContentViewModel.m中代碼
- (RACSignal *)errorStringSignal {
if (!_errorStringSignal) {
RACSignal *companyNameError = [self.companyNameSignal map:^id(NSString *value) {
if (value.length <= 0) {
return @"公司名稱不能為空";
}else {
return @"";
}
}];
RACSignal *taxNumberError = [self.taxNumberSignal map:^id(NSString *value) {
if (value.length <= 0) {
return @"納稅人識別號不能為空";
}else if (![value isTaxNumber]) {
return @"納稅人識別號輸入不正確";
}else {
return @"";
}
}];
RACSignal *receiverError = [self.receiverSignal map:^id(NSString *value) {
return value.length > 0 ? @"" : @"聯系人不能為空";
}];
RACSignal *phoneError = [self.phoneSignal map:^id(NSString *value) {
if (value.length <= 0) {
return @"電話不能為空";
}else if (value.length != 11) {
return @"電話輸入不正確";
}else {
return @"";
}
}];
RACSignal *regionError = [self.regionSignal map:^id(NSString *value) {
return value.length > 0 ? @"" : @"地址不能為空";
}];
RACSignal *minaddressError = [self.minAddressSignal map:^id(NSString *value) {
return value.length > 0 ? @"" : @"詳細地址不能為空";
}];
RACSignal *emailError = [self.emailSignal map:^id(NSString *value) {
if (value.length <= 0) {
return @"郵箱不能為空";
}else if (![value isEmail]) {
return @"郵箱輸入不正確";
}else {
return @"";
}
}];
NSDictionary *sourceDict =
@{
@(Invoice_Source_Paper):
[RACSignal combineLatest:@[receiverError,phoneError,regionError,minaddressError] reduce:^id(NSString *receiver, NSString *phone,NSString *region,NSString *minaddress){
NSMutableArray *array = [NSMutableArray array];
if (receiver.length > 0) { [array addObject:receiver]; }
if (phone.length > 0) { [array addObject:phone]; }
if (region.length > 0) { [array addObject:region]; }
if (minaddress.length > 0) { [array addObject:minaddress]; }
return array;
}],
@(Invoice_Source_NonPaper):
[RACSignal combineLatest:@[receiverError,phoneError,emailError] reduce:^id(NSString *receiver, NSString *phone,NSString *email){
NSMutableArray *array = [NSMutableArray array];
if (receiver.length > 0) { [array addObject:receiver]; }
if (phone.length > 0) { [array addObject:phone]; }
if (email.length > 0) { [array addObject:email]; }
return array;
}]
};
RACSignal *sourceError = [RACSignal switch:self.sourceSignal cases:sourceDict default:nil];
NSDictionary *ownerDict =
@{
@(Invoice_Owner_Personal): [RACSignal return:nil],
@(Invoice_Owner_Company):
[RACSignal combineLatest:@[companyNameError,taxNumberError] reduce:^id(NSString *companyName, NSString *taxNumber){
NSMutableArray *array = [NSMutableArray array];
if (companyName.length > 0) { [array addObject:companyName]; }
if (taxNumber.length > 0) { [array addObject:taxNumber]; }
return array;
}]
};
RACSignal *ownerError = [RACSignal switch:self.ownerSignal cases:ownerDict default:nil];
_errorStringSignal = [RACSignal combineLatest:@[sourceError,ownerError] reduce:^id(NSArray *sourceArray, NSArray *ownerArray){
NSMutableArray *array = [NSMutableArray array];
[array addObjectsFromArray:sourceArray];
[array addObjectsFromArray:ownerArray];
return array;
}];
}
return _errorStringSignal;
}
把errorStringSignal和errorstring屬性
- 這步看似多次一舉,實則是因為頁面需求并不是每次有錯誤就彈出,而是在點擊下一步的時候才彈出
- 因為先用errorstring屬性保存錯誤值,點擊下一步的通過subscriper發出
// GBInvoiceContentController.m 中代碼
RAC(self.viewModel,errorStrings) = self.viewModel.errorStringSignal;
創建下一步command,有錯誤senderror,沒有sendcomplete
// GBInvoiceContentViewModel.m中代碼
- (RACCommand *)nextCmd {
if (!_nextCmd) {
@weakify(self);
_nextCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
@strongify(self);
if (self.errorStrings == nil || self.errorStrings.count <= 0) {
[subscriber sendNext:[self.invoice showParame]];
[subscriber sendCompleted];
}else {
[subscriber sendError:[NSError errorWithDomain:@"輸入有誤" code:0 userInfo:@{@"errorStrings":self.errorStrings}]];
}
return nil;
}];
}];
}
return _nextCmd;
}
下一步command與下一步按鈕綁定,并且綁定成功和失敗信號到對應的控制器方法
// GBInvoiceContentController.m 中代碼
self.confirmView.confirmButton.rac_command = self.viewModel.nextCmd;
[self rac_liftSelector:@selector(showAlert:) withSignals:[[self.viewModel.nextCmd executionSignals] switchToLatest], nil];
[self rac_liftSelector:@selector(showError:) withSignals:self.viewModel.nextCmd.errors, nil];
/** 輸入錯誤提醒 */
- (void)showError:(NSError *)error {
NSArray *errorStrings = error.userInfo[@"errorStrings"];
[CSToastManager setDefaultPosition:CSToastPositionCenter];
[self.view makeToast:[errorStrings componentsJoinedByString:@" | "]];
}
/** 輸入成功彈窗 */
- (void)showAlert:(id)obj {
GBInvoiceAlert *alertView = [GBInvoiceAlert showWith:obj confirmBlock:nil];
alertView.confirmBtn.rac_command = self.viewModel.confirmCmd;
}
創建comfirmCmd
// GBInvoiceContentViewModel.m中代碼
- (RACCommand *)confirmCmd {
if (!_confirmCmd) {
_confirmCmd = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
if (arc4random() % 2 == 0) {
[subscriber sendNext:@"開票成功"];
[subscriber sendCompleted];
}else {
NSError *error = [NSError errorWithDomain:@"開票失敗" code:00 userInfo:nil];
[subscriber sendError:error];
}
return nil;
}];
}];
}
return _confirmCmd;
}
最后一步綁定彈窗確定按鈕和comfirmCmd,并且綁定成功和失敗信號到對應的控制器方法
// GBInvoiceContentController.m 中代碼
// 綁定彈窗的成功和失敗信號
{
[self rac_liftSelector:@selector(postParamSuccess:) withSignals:[[self.viewModel.confirmCmd executionSignals] switchToLatest], nil];
[self rac_liftSelector:@selector(postParamFailure:) withSignals:self.viewModel.confirmCmd.errors, nil];
}
/** 開票成功 */
- (void)postParamSuccess:(id)obj {
[self.view makeToast:@"開票成功"];
}
/** 開票失敗 */
- (void)postParamFailure:(id)obj {
[self.view makeToast:@"開票失敗"];
}
1,使用RACComand和RACSigna,可以很方便的拿到各自獨立的事件或信號.
2, RAC有大量的信號操作,可以非常方便做業務邏輯.不管是信號合并信號轉化都不需要蛋疼的中間變量.
3,RAC有吊炸天的綁定,更是方便了從結果到界面的one step.
