Segue

A segue (/ˈsɛɡweɪ/ (listen); Italian pronunciation: [ˈseːɡwe]) is a transition from one topic or section to the next.[1] The term is derived from Italian segue, which literally means "follows".

Segue

In music, segue is a direction to the performer. It means continue (the next section) without a pause. The term attacca is used synonymously. For written music, it implies a transition from one section to the next without any break. In improvisation, it is often used for transitions created as a part of the performance, leading from one section to another.

In live performance, a segue can occur during a jam session, where the improvisation of the end of one song progresses into a new song. Segues can even occur between groups of musicians during live performance. For example, as one band finishes its set, members of the following act replace members of the first band one by one, until a complete band swap occurs.

In recorded music, a segue sometimes means a seamless change between one song and another, sometimes achieved through beatmatching, especially on dance and disco recordings. However, as noted by composer John Williams in the liner notes for his Star Wars soundtrack album, a series of musical ideas can be juxtaposed with no transitions whatsoever. Arrangements that involve or create the effect of a classical musical suite, may be used in many pieces or progressive rock recordings, but by definition, a segue does not involve a bridging transition--it is an abrupt change of musical idea (completely contradicting a widespread assumption by non-musicians who believe that a segue actually means a musical bridge and thus ignorantly say things in conversation such as "that makes a perfect segue to...."). With breakless joins of the elements in his albums Frank Zappa made extensive use of the segue technique.[2] This was first used in 1966 on Zappa's Freak Out!, and a year later on the Beatles' Sgt. Pepper's Lonely Hearts Club Band.[2]

In audio/visual media, a segue is transition from one scene or topic to another. A segue allows the director or show host to naturally proceed from one scene or topic to another without jarring the audience. A good segue makes the transition look natural and effortless.

I am using iCarousel and I have to create my own button. I want to pass data from the button made programmatically to another view, but I don't have a segue identifier because I created the button programmatically. I don't know if it is possible to create the identifier of the segue programmatically.

I`m trying to perform a segue if its the first time the app is loading.I can see my print message in the debugger, but the Perform Segue is not working. I don't get any errors.Can somebody please tell me whats wrong?

1740, an instruction in musical scores, from Italian segue, "now follows," a direction to play into the following movement without a break; third person singular of seguire "to follow," from Latin sequi "to follow" (from PIE root *sekw- (1) "to follow").

trademark name (Segway Inc., Bedford, New Hampshire, U.S.), in use from 2001; according to the company, chosen for similarity to segue (q.v.) on notion of "a smooth transition from one place to another," with probable influence of way (n.).

Unwind segues, introduced in iOS 6, cause quite a bit of confusion among developers. Even if you are used to working with storyboards, you may have stayed clear from unwind segues because you don't exactly know what they are or how they work. This article resolves that problem. In this tutorial, I explain the nuts and bolts of unwind segues.

You probably already know that segues and storyboards work very well together. Unwind segues are no different. Before we can add an unwind segue, we need a navigation hierarchy to work with. Open Main.storyboad and select the view controller of the View Controller Scene. Open the Identity Inspector on the right and set Class to RootViewController.

Add a button to the root view controller, center it in the view controller's view, and set its title to Show. To navigate from the root view controller to the ViewController instance, we need to create a segue. Press Control and drag from the button in the root view controller to the view controller, selecting Show from the menu that pops up. That is one segue created.

Add two buttons to the ViewController instance, Back and Forward. Create a Show segue from the Forward button to the UIViewController instance. The Back button will trigger an unwind segue.

Before we add an unwind segue to the storyboard, you need to know a bit more about unwind segues. Despite their name, unwind segues differ in several ways from regular segues. For example, unwind segues always segue from the source or current view controller to an existing view controller, a view controller that is already present in the navigation hierarchy.

What makes unwind segues powerful is their ability to unwind the navigation hierarchy one or more steps. This is something we explore a bit later. When I first read about unwind segues, I was a bit skeptical. I could not find a compelling reason to use them. After using them in a few projects, I have come to appreciate their power and flexibility.

Another interesting aspect of unwind segues is that they do not explicitly define a destination view controller. An unwind segue searches for its destination view controller at runtime by traversing the navigation hierarchy. And that is exactly what makes unwind segues powerful.

Open RootViewController.swift and define the following unwind action. As you can see, the implementation is pretty basic. The unwind action is what marks a view controller as a potential destination view controller for an unwind segue.

To create an unwind segue, we need to revisit Main.storyboard. Press Control and drag from the Back button of the ViewController instance to the Exit icon at the top of the scene. The unwind action we created a moment ago should be included in the menu that pops up. Select the unwind action to create the unwind segue.

The exit icon symbolizes the exit point of a view controller scene. It is possible to create multiple unwind segues for a view controller scene. Each unwind segue can have a different destination view controller.

Run the application in the simulator to test the unwind segues we created. As you can see, it is possible to trigger the same unwind action for several unwind segues in different view controller scenes. In fact, that is one of the strengths of unwind segues.

When the user taps the Back button in any of the view controllers, the unwind segue you created inspects the navigation hierarchy and searches for the destination view controller of the segue. It traverses the navigation hierarchy and asks each view controller whether it can respond to the unwind action we linked to the unwind segue.

The destination view controller is not set at compile time. That is very important to understand and it is a key difference with regular segues. If the unwind segue does not find a view controller that can respond to the unwind action, the unwind segue is aborted.

If a destination view controller is found, a number of events are triggered. The source view controller is given the opportunity to prepare for the unwind segue in its prepareForSegue(_:sender:) method. Next, the destination view controller is notified through the invocation of the unwind action. After the source and destination view controllers have had a chance to prepare for the segue, the unwind segue is performed.

It is possible to pass data from the source view controller to the destination view controller in prepareForSegue(_:sender:) and in the unwind action. When prepareForSegue(_:sender:) is invoked, the destination view controller is known and accessible through the destinationViewController property of the storyboard segue. The destination view controller has access to the source view controller through the storyboard segue that is passed in as the only argument of the unwind action.

While I like the flexibility of regular and unwind segues, passing data between view controllers using segues should not be overused as it can introduce too much coupling between view controllers. Keep this in mind.

While unwind segues are a powerful addition to storyboards, know that unwind segues can also be triggered in code. Select the unwind segue of the ViewController instance in the storyboard, open the Attributes Inspector on the right, and set the identifier of the segue.

What I like about unwind segues is that you can create multiple unwind segues that unwind to the same destination view controller. The example we created illustrates this. The Back button of both view controllers trigger an unwind segue that unwinds the navigation hierarchy to the root view controller.

To end this tutorial, I would like to show you that unwind segues can be used with any type of navigation hierarchy. The complexity is irrelevant. Open Main.storyboard, add another ViewController instance, and embed it in a navigation controller. Add a button to the view controller and have it trigger the unwind action of the root view controller. You now know how to do this.

Add a bar button item to the navigation bar of the root view controller and create a segue from the bar button item to the navigation controller of which the view controller you just added is the root view controller. Make sure the segue presents the view controller modally by setting Kind to Present Modally in the Attributes Inspector.

Run the application in the simulator and tap the bar button item in the navigation bar to show the view controller modally. When you tap the Dismiss button, the unwind action is triggered and the unwind segue is performed. No matter how the navigation hierarchy looks, the unwind segue reaches its destination view controller without issues. 041b061a72