Modal Presentation styles are used when you are transitioning from one view controller to another. There are 2 ways of achieving this customization. One is through code and another through Interface Builder(using segues). This effect is achieved by setting
modalPresentationStyle variable to an instance of
modalPresentationStyle property is a class variable of
UIViewController and is used to specify how a
ViewController is presented on screen.
# Exploring ModalPresentationStyle using Interface Builder
This will be a very basic app which will illustrate different
ModalpresentationStyle in iOS. According to documentation found here, There are 9 different values for
UIModalPresentationStyle which are as follows,
To setup a project, just create a normal iOS project and add 2
ViewControllers. Put a
UIButton in you initial
ViewController and connect it to 2nd
ViewController via a
Target -> Action mechanism. To distinguish both
ViewControllers, set background property of
ViewController some other color. If all goes well, your Interface Builder should look something this,
Make sure you build this project and run it on iPad (For details on why iPad, refer to Remarks section). Once you are done setting up your project, select the segue and go to the
attributes inspector. You should be able to see something like this,
Set the kind property to
Now, we won't see all of the effects in this example as some of them requires little bit of code.
Let's start with
fullscreen. This effect is selected by default when you select
Present Modally in
Kind tab. When you build and run, the 2nd
ViewController would occupy the full screen of you iPad.
pageSheet. You can select this option from
Presentation tab. In this option, when device is in portrait mode, the 2nd
ViewController is similar to full screen but in landscape mode, 2nd
ViewController is much narrow the device width. Also, any content not covered by 2nd
ViewController will be dimmed.
formSheet style, the 2nd
ViewController is placed in center of device and the size is smaller to that of device. Also when device is in landscape mode and keyboard is visible position of view is adjusted upwards to show the
Last style which we are going to try is
popover. To select this style, select
Present as Popover in
Kind tab. The 2nd
ViewController is presented as a small popover(size can be set). The background content is dimmed. Any tap outside the popover would dismiss the popover. Your
Attributes Inspector should look something like this,
Anchor is the UI element to which you want your popover arrow to point.
Directions are the directions you allow your popover
Anchor to point in.
There more then these basic Modal Presentation Styles but they are little complicated to achieve and require some code. More details can be found in the Apple Documentation.
Always remember the following mention from Apple.
In a horizontally compact environment, modal view controllers are always presented full-screen. In a horizontally regular environment, there are several different presentation options.