我的代码:
navigator.m
- (void)newPushPage:(UIViewController *)controller
{
[self pushViewController:controller animated:YES];
}
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC
{
if (operation == UINavigationControllerOperationPush || operation == UINavigationControllerOperationPop)
{
self.animator = [Animator new];
return self.animator;
}
return nil;
}
animator.m
- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
return 0.5;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
[[transitionContext containerView] addSubview:toViewController.view];
toViewController.view.alpha = 0;
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
fromViewController.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
toViewController.view.alpha = 1;
} completion:^(BOOL finished) {
fromViewController.view.transform = CGAffineTransformIdentity;
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
}
在pushPage和屏幕出现之后,出现了一个问题:隐藏在代码中的所有元素都可见,我可以看到元素在看到屏幕时是如何消失的。看起来不美观。有办法吗?
答案 0 :(得分:1)
在animateTransition(id)transitionContext协议中,推送和弹出过渡必须单独处理,如下所示。
// 1.设置fromVC ..
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
CGRect sourceRect = [transitionContext initialFrameForViewController:fromVC];
CGRect finalFrameForVC = [transitionContext finalFrameForViewController:toVC];
// 2.插入toVC视图。
if(pushCondition) {
UIView *container = [transitionContext containerView];
[container insertSubview:toVC.view aboveSubview:fromVC.view];
toVC.view.alpha = 0.5;
toVC.view =
} else if (popCondition ){
UIView *container = [transitionContext containerView];
toVC.view.frame = finalFrameForVC;
toVC.view.alpha = 0.5;
[container addSubview:toVC.view];
[container sendSubviewToBack:toVC.view];
UIView *snapShoot = [fromVC.view snapshotViewAfterScreenUpdates:false];
}
// 3.执行动画。
[UIView animateWithDuration:1.0
delay:0.0
usingSpringWithDamping:1.0
initialSpringVelocity:6.0
options:UIViewAnimationOptionCurveLinear
animations:^{
//Setup the final parameters of views for push
toVC.view // update final view frame
toVC.view.alpha = 1.0;
//Setup the final parameters of views for pop
snapShoot.frame =
} completion:^(BOOL finished) {
//When the animation is completed call completeTransition with final push value
[snapShoot removeFromSuperview];
//When the animation is completed call completeTransition with final push value
toVC.view.alpha= 1.0;
[transitionContext completeTransition:YES];
}];
在amimator中创建enum / flag属性并将其设置在导航控制器委托中。
if (operation == UINavigationControllerOperationPush)
{
self.animator = [Animator new];
self.animator.pushPopAnimation = UINavigationControllerOperationPush;
return self.animator;
}
请参阅上面代码中的snapshotViewAfterScreenUpdates:(BOOL)afterUpdates方法的apple文档。