ios - RACSignal: Why use rac_textSignal a "defer" to return a RACSignal to self? -


the rac_textsignal-implementation uses "defer" return racsignal on "self". reason that?

this implementation:

- (racsignal *)rac_textsignal {     @weakify(self);     return [[[[[racsignal         defer:^{             @strongify(self);             return [racsignal return:self];         }]         concat:[self rac_signalforcontrolevents:uicontroleventeditingchanged]]         map:^(uitextfield *x) {             return x.text;         }]         takeuntil:self.rac_willdeallocsignal]         setnamewithformat:@"%@ -rac_textsignal", [self rac_description]]; }

both deferred signal , concatenated signal send uitextfields (effectively self).

the deferred signal makes returned signal send stored text on subscription, [self rac_signalforcontrolevents:uicontroleventeditingchanged] sends on changes.


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