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Open iMovie. Select a project. Select a transition icon. Tap Fade. Tap Settings . Tap the "Fade in from Black" switch . Tap the "Fade out to black" switch . Tap Done.
Tap the purple icon with a white star and a video camera on it. Tap the Projects tab at the top of the screen, then tap a project that you want to open. Tap one of the |►◄| icons in between two clips. A pop-up menu will appear. Doing so will place a fade-out transition on the end of the left clip, and a fade-in transition on the right clip. Repeat this step for any other transition icons that you want to change. It's in the bottom-right corner of the screen. Doing so prompts a pop-up menu to appear. If you don't see this option, tap a clip, then swipe right or left. The switch will turn on {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/15\/Iphoneswitchonicon1.png","bigUrl":"\/images\/thumb\/1\/15\/Iphoneswitchonicon1.png\/46px-Iphoneswitchonicon1.png","smallWidth":460,"smallHeight":300,"bigWidth":"46","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}. Doing so adds the black fade-in effect to the beginning of your project. The switch will turn on {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/15\/Iphoneswitchonicon1.png","bigUrl":"\/images\/thumb\/1\/15\/Iphoneswitchonicon1.png\/46px-Iphoneswitchonicon1.png","smallWidth":460,"smallHeight":300,"bigWidth":"46","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an iPhone\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}. This will add the black fade-out effect to the end of your project. It's in the top-right corner of the screen. Doing so saves your settings and applies the black fade-in and/or fade-out effects.