ViewController 滑动动画 [英] ViewController slide animation
问题描述
我想创建一个类似于 iOS 应用 facebook at tabswitch[1] 的动画.我已经尝试开发某种动画,出现的问题是旧的视图控制器直接在开关上变得不可见,而不是在新控制器快速滑入时缓慢淡出.
我发现了这个问题
I want to create an animation like the iOS app facebook at tabswitch[1]. I have already tried to develop some kind of animation, the problem that occurs is that the old view controller becomes invisible directly on the switch, instead of fading out slowly while the new controller is sliding in fast.
I've found this SO question How to animate Tab bar tab switch with a CrossDissolve slide transition? but the as correct marked solution does not really work for me (it is not a slide it is a fade transition). What I'd also like to get is the function to make slide left or right to switch the tabs. Like it was on a older version of facebook.
What I've got so far is this:
extension TabBarController: UITabBarControllerDelegate {
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
guard let fromView = selectedViewController?.view,
let toView = viewController.view else { return false }
if fromView != toView {
toView.transform = CGAffineTransform(translationX: -90, y: 0)
UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations: {
toView.transform = CGAffineTransform(translationX: 0, y: 0)
})
}; return true
}
}
class TabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
}
How to fix this?
[1] I would very much like to add a gif from the Facebook app. The problem is that I don't want to censor the video and just reveal too much of my data. (Even if fb already has them). Also on youtube I didn't find a suitable recording. Please try it yourself in the fb app in iOS.
You can use the following idea: https://samwize.com/2016/04/27/making-tab-bar-slide-when-selected/
Also, here's the code updated to Swift 4.1 and I also removed the force unwrappings:
import UIKit
class MyTabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
}
extension MyTabBarController: UITabBarControllerDelegate {
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
guard let tabViewControllers = tabBarController.viewControllers, let toIndex = tabViewControllers.index(of: viewController) else {
return false
}
animateToTab(toIndex: toIndex)
return true
}
func animateToTab(toIndex: Int) {
guard let tabViewControllers = viewControllers,
let selectedVC = selectedViewController else { return }
guard let fromView = selectedVC.view,
let toView = tabViewControllers[toIndex].view,
let fromIndex = tabViewControllers.index(of: selectedVC),
fromIndex != toIndex else { return }
// Add the toView to the tab bar view
fromView.superview?.addSubview(toView)
// Position toView off screen (to the left/right of fromView)
let screenWidth = UIScreen.main.bounds.size.width
let scrollRight = toIndex > fromIndex
let offset = (scrollRight ? screenWidth : -screenWidth)
toView.center = CGPoint(x: fromView.center.x + offset, y: toView.center.y)
// Disable interaction during animation
view.isUserInteractionEnabled = false
UIView.animate(withDuration: 0.3,
delay: 0.0,
usingSpringWithDamping: 1,
initialSpringVelocity: 0,
options: .curveEaseOut,
animations: {
// Slide the views by -offset
fromView.center = CGPoint(x: fromView.center.x - offset, y: fromView.center.y)
toView.center = CGPoint(x: toView.center.x - offset, y: toView.center.y)
}, completion: { finished in
// Remove the old view from the tabbar view.
fromView.removeFromSuperview()
self.selectedIndex = toIndex
self.view.isUserInteractionEnabled = true
})
}
}
So, you need to subclass UITabBarController and you also have to write the animation part, you can tweak the animation options (delay, duration, etc).
I hope it helps, cheers!
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