signals.m

RACSignal *controlUpdate = [myButton rac_signalForControlEvents:UIControlEventTouchUpInside];
    // signals for UIControl events send the control event value (UITextField, UIButton, UISlider, etc)
    // subscribeNext:^(UIButton *button) { NSLog(@"%@", button); // UIButton instance }

RACSignal *textChange = [myTextField rac_textSignal];
    // some special methods are provided for commonly needed control event values off certain controls
    // subscribeNext:^(UITextField *textfield) { NSLog(@"%@", textfield.text); // "Hello!" }

RACSignal *alertButtonClicked = [myAlertView rac_buttonClickedSignal];
    // signals for some delegate methods send the delegate params as the value
    // e.g. UIAlertView, UIActionSheet, UIImagePickerControl, etc
    // (limited to methods that return void)
    // subscribeNext:^(NSNumber *buttonIndex) { NSLog(@"%@", buttonIndex); // "1" }

RACSignal *viewAppeared = [self rac_signalForSelector:@selector(viewDidAppear:)];
    // signals for arbitrary selectors that return void, send the method params as the value
    // works for built in or your own methods
    // subscribeNext:^(NSNumber *animated) { NSLog(@"viewDidAppear %@", animated); // "viewDidAppear 1" }