趁周末閑暇之余，重新寫一下present和push的自定義動畫。
本來之前有寫過一個，因為沒有及時整理，到導致一時凌亂，找不到具體在哪了，提醒各位，平時要注意代碼的整理和歸檔，不然到時候重復的代碼寫了又寫，那就得不償失了。廢話不過說，先看下下面的效果：
效果圖展示
原生的present是從底部向上彈出相應的視圖控制器，而push動畫，則是將視圖從右邊推出來進行展示，為了視圖展示的統一性，需要自定義轉場動畫，將present改成從右往左推出來展示，在dismiss的VC中需要增加一個左邊的手勢，以滿足側滑返回的效果。
首先需要主頁VC實現UIViewControllerTransitioningDelegate這個代理中的2個方法
#pragma mark - UIViewControllerTransitioningDelegate
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{
return [[YQPresentTransitionAnimated alloc] init];
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
return [[YQDismissTransitionAnimated alloc] init];
}
將它的present動畫和dismiss動畫交給我們自定義的動畫來管理。
present動畫的自定義####
1.創建一個類，繼承至NSObject,并實現UIViewControllerAnimatedTransitioning的代理;
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface YQPresentTransitionAnimated : NSObject<UIViewControllerAnimatedTransitioning>
@end
2.實現代理的2個方法
//1.定義轉場動畫的時間
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
return 0.4;
}
//2.實現轉場動畫的動畫效果
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; //主頁VC
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; //present的VC
UIView *containerView = transitionContext.containerView; //轉場的容器視圖，動畫完成后，會消失
UIView *fromView;
UIView *toView;
if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
toView = [transitionContext viewForKey:UITransitionContextToViewKey];
} else {
fromView = fromViewController.view;
toView = toViewController.view;
}
//注意這個對應關系
BOOL isPresenting = (toViewController.presentingViewController == fromViewController);
CGRect fromFrame = [transitionContext initialFrameForViewController:fromViewController];
CGRect toFrame = [transitionContext finalFrameForViewController:toViewController];
if (isPresenting) {
fromView.frame = fromFrame;
toView.frame = CGRectOffset(toFrame, toFrame.size.width, 0);
}
if (isPresenting)
[containerView addSubview:toView];
NSTimeInterval transitionDuration = [self transitionDuration:transitionContext];
[UIView animateWithDuration:transitionDuration animations:^{
if (isPresenting) {
toView.frame = toFrame;
fromView.frame = CGRectOffset(fromFrame, fromFrame.size.width * 0.3 * -1, 0);
}
} completion:^(BOOL finished) {
//固定寫法
BOOL wasCancelled = [transitionContext transitionWasCancelled];
if (wasCancelled)
[toView removeFromSuperview];
[transitionContext completeTransition:!wasCancelled];
}];
}
3.將主頁VC的transitioningDelegate設為自己，【千萬注意】：還需要將present的頁面的transitioningDelegate設為自己（主頁VC）
dismiss動畫的自定義####
跟上面的present步驟一樣，只需將動畫效果換成相反的即可。
