RACCommand error信号回调随笔
ViewModel创建RACCommand：
-(RACCommand *)command{
if(!_command){
_command =[[RACCommand alloc]initWithSignalBlock:^RACSignal * _Nonnull(id _Nullable input){
return[self signal];
}];
}
return _command;
}
-(RACSignal *)signal{
return[RACSignal createSignal:^RACDisposable * _Nullable(id _Nonnull subscriber){
[[RequestManager sharedManager]showHud:YES successBlock:^(NSDictionary *response){
[subscriber sendNext:Model];
[subscriber sendCompleted];
} failureBlock:^(NSError *error){
[subscriber sendError:error];
[subscriber sendCompleted];
}];
return nil;
}];
}
在View层调用Command：
[self.viewModel.couponDetailCommand.executionSignals.switchToLatest subscribeNext:^(id _Nullable x){
[self showCouponDetailView];
}error:^(NSError * _Nullable error){
NSLog()
}];
[self.viewModel.couponDetailCommand execute:@1];
这种方式viewModel中sendError得话是收不到回调。
解决方案：
一、更改为：
[[self.viewModel.couponDetailCommand execute:@{}]subscribeNext:^(id _Nullable x){
[self showCouponDetailView];
}error:^(NSError * _Nullable error){
[self showNormalView];
}];
二、使用Command的error信号
[self.viewModel.couponDetailCommand.executionSignals.switchToLatest subscribeNext:^(id _Nullable x){
//请求成功
}];
[self.viewModel.couponDetailCommand.errors subscribeNext:^(NSError * _Nullable x){
//请求失败
}];
三、使用materialize和dematerialize
materialize将所有的信号封装成event一并回调，但会导致Command对象中error、executing等信号无回调，不建议使用
-(RACCommand *)couponDetailCommand{
if(!_couponDetailCommand){
_couponDetailCommand =[[RACCommand alloc]initWithSignalBlock:^RACSignal * _Nonnull(id _Nullable input){
return[[self signal]materialize];
}];
}
return _couponDetailCommand;
}
[self.viewModel.couponDetailCommand.executionSignals subscribeNext:^(RACSignal *execution){
[[[execution dematerialize]deliverOn:[RACScheduler mainThreadScheduler]]subscribeError:^(NSError *error){
NSLog(@"发生错误");
} completed:^{
NSLog(@"完成");
}];
}];
