当我要控制一个按钮是否有效和添加按钮事件时ide
这样写会出错:blog
//当两个输入框有值的时候,按钮才有效 RAC(self.sendBtn, enabled) = [RACSignal combineLatest: @[self.passwordOldTxt.rac_textSignal,self.passwordTxt.rac_textSignal] reduce:^id(NSString *passwordOld, NSString *password){ return @(passwordOld.length > 0 && password.length > 0); }]; @weakify(self); self.sendBtn.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { @strongify(self); NSLog(@"self.sendBtn.rac_command TouchUpInside %@", self.title); return [RACSignal empty]; }];
由于ReactiveCocoa把Enabled和Command都整合了事件
因此要写为input
@weakify(self); self.sendBtn.rac_command = [[RACCommand alloc] initWithEnabled: [RACSignal combineLatest: @[self.passwordOldTxt.rac_textSignal,self.passwordTxt.rac_textSignal] reduce:^id(NSString *passwordOld, NSString *password){ return @(passwordOld.length > 0 && password.length > 0); }] signalBlock:^RACSignal *(id input) { @strongify(self); NSLog(@"self.sendBtn.rac_command TouchUpInside %@", self.title); return [RACSignal empty]; }];