我正在使用標簽欄驅動的應用程序中以編程方式切換標簽UITabBarController.selectedIndex。我要解決的問題是如何為視圖之間的過渡設置動畫。即。從當前選項卡的視圖到所選選項卡的視圖。首先想到的是利用UITabBarControllerDelegate，但似乎在以編程方式切換選項卡時未調用此方法。我現在考慮使用UITabBarDelegate.didSelectItem：作為設置過渡動畫的可能鉤子。有沒有人設法使過渡動畫？如果是，怎么辦？
3 回答
米琪卡哇伊
TA貢獻1998條經驗 獲得超6個贊
更新04/2016： Justed想更新此內容，對所有人的所有投票表示感謝。另請注意，這最初是在...之前，ARC之前，約束之前，...之前寫的。因此，在決定是否使用這些技術時，請考慮到這一點?？赡軙懈喱F代方法。哦，如果找到一個。請添加回復，以便所有人都能看到。謝謝。
一段時間之后 ...
經過大量研究，我提出了兩個可行的解決方案。這兩個選項在標簽之間都起作用并且起作用。
解決方案1：從視圖過渡（簡單）
這是最簡單的方法，并且使用了預定義的UIView過渡方法。使用此解決方案，我們不需要管理視圖，因為該方法可以為我們完成工作。
// Get views. controllerIndex is passed in as the controller we want to go to.
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = [[tabBarController.viewControllers objectAtIndex:controllerIndex] view];
// Transition using a page curl.
[UIView transitionFromView:fromView
toView:toView
duration:0.5
options:(controllerIndex > tabBarController.selectedIndex ? UIViewAnimationOptionTransitionCurlUp : UIViewAnimationOptionTransitionCurlDown)
completion:^(BOOL finished) {
if (finished) {
tabBarController.selectedIndex = controllerIndex;
}
}];
解決方案2：滾動（更復雜）
一個更復雜的解決方案，但可以讓您更好地控制動畫。在此示例中，我們可以打開和關閉視圖。對于這一點，我們需要自己管理視圖。
// Get the views.
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = [[tabBarController.viewControllers objectAtIndex:controllerIndex] view];
// Get the size of the view area.
CGRect viewSize = fromView.frame;
BOOL scrollRight = controllerIndex > tabBarController.selectedIndex;
// Add the to view to the tab bar view.
[fromView.superview addSubview:toView];
// Position it off screen.
toView.frame = CGRectMake((scrollRight ? 320 : -320), viewSize.origin.y, 320, viewSize.size.height);
[UIView animateWithDuration:0.3
animations: ^{
// Animate the views on and off the screen. This will appear to slide.
fromView.frame =CGRectMake((scrollRight ? -320 : 320), viewSize.origin.y, 320, viewSize.size.height);
toView.frame =CGRectMake(0, viewSize.origin.y, 320, viewSize.size.height);
}
completion:^(BOOL finished) {
if (finished) {
// Remove the old view from the tabbar view.
[fromView removeFromSuperview];
tabBarController.selectedIndex = controllerIndex;
}
}];
Swift中的此解決方案：
extension TabViewController: UITabBarControllerDelegate {
public func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
let fromView: UIView = tabBarController.selectedViewController!.view
let toView : UIView = viewController.view
if fromView == toView {
return false
}
UIView.transitionFromView(fromView, toView: toView, duration: 0.3, options: UIViewAnimationOptions.TransitionCrossDissolve) { (finished:Bool) in
}
return true
}
}
明月笑刀無情
TA貢獻1828條經驗 獲得超4個贊
以下是我嘗試使用代碼形式drekka到委托（UITabBarControllerDelegate）方法中
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
NSArray *tabViewControllers = tabBarController.viewControllers;
UIView * fromView = tabBarController.selectedViewController.view;
UIView * toView = viewController.view;
if (fromView == toView)
return false;
NSUInteger fromIndex = [tabViewControllers indexOfObject:tabBarController.selectedViewController];
NSUInteger toIndex = [tabViewControllers indexOfObject:viewController];
[UIView transitionFromView:fromView
toView:toView
duration:0.3
options: toIndex > fromIndex ? UIViewAnimationOptionTransitionFlipFromLeft : UIViewAnimationOptionTransitionFlipFromRight
completion:^(BOOL finished) {
if (finished) {
tabBarController.selectedIndex = toIndex;
}
}];
return true;
}
拉丁的傳說
TA貢獻1789條經驗 獲得超8個贊
我的iOS7.0或更高版本的解決方案。
您可以在標簽欄的委托中指定自定義動畫控制器。
實現這樣的動畫控制器：
@interface TabSwitchAnimationController : NSObject <UIViewControllerAnimatedTransitioning>
@end
@implementation TabSwitchAnimationController
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
return 0.2;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
UIViewController* fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController* toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView* toView = toVC.view;
UIView* fromView = fromVC.view;
UIView* containerView = [transitionContext containerView];
[containerView addSubview:toView];
toView.frame = [transitionContext finalFrameForViewController:toVC];
// Animate by fading
toView.alpha = 0.0;
[UIView animateWithDuration:[self transitionDuration:transitionContext]
delay:0.0
options:UIViewAnimationOptionCurveEaseOut | UIViewAnimationOptionAllowUserInteraction
animations:^{
toView.alpha = 1.0;
}
completion:^(BOOL finished) {
toView.alpha = 1.0;
[fromView removeFromSuperview];
[transitionContext completeTransition:YES];
}];
}
@end
然后在您的UITabBarControllerDelegate中使用它：
- (id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
animationControllerForTransitionFromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC
{
return [[TabSwitchAnimationController alloc] init];
}
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