iOS 自定义转场动画初探
来源:互联网 发布:dotamax数据不更新 编辑:程序博客网 时间:2024/05/22 03:19
最近项目刚迭代,正好闲下来捣鼓了一下iOS的自定义转场的效果。闲话不多说,直接开始上代码吧。(ps:请忽略实际的转场效果,关注技术本身呢哦。pps:主要是转场的动画做的比较low啦!)
1、首先定义一个转场动画的类
第一步,咱们先定义一个管理转场动画的类。首先创建一个继承自NSObject的类,这里叫JTAnimatedTransition,并且让其遵循UIViewControllerAnimatedTransitioning这个协议。
这个是.h文件代码。 我在这里定义了一个枚举,用来表示转场的类型。并且还遵循的CAAnimationDelegate协议,这个后面会说到。 再有呢,就是一个类方法了,这个是在使用的控制器中会用到的方法,具体的用法后续代码中会有体现。
#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>typedef enum { JTAnimatedTransitionTypePush, JTAnimatedTransitionTypePop, JTAnimatedTransitionTypePresent, JTAnimatedTransitionTypeDismiss}JTAnimatedTransitionType;@interface JTAnimatedTransition : NSObject<UIViewControllerAnimatedTransitioning, CAAnimationDelegate>@property (assign, nonatomic) JTAnimatedTransitionType type;@property (strong, nonatomic) id transitionContext;+ (JTAnimatedTransition *)animatedTransitionWithType:(JTAnimatedTransitionType)type;@end
接下来是.m中的代码了。 具体说明在代码中都有详细注释。
#import "JTAnimatedTransition.h"@implementation JTAnimatedTransition+ (JTAnimatedTransition *)animatedTransitionWithType:(JTAnimatedTransitionType)type{ JTAnimatedTransition *animatedTransition = [[JTAnimatedTransition alloc] init]; animatedTransition.type = type; return animatedTransition;}#pragma mark - UIViewControllerAnimatedTransitioning- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext{ //返回动画执行的时间 return 0.5;}- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{ //在这里设置自己想要的动画效果 self.transitionContext = transitionContext; if (self.type == JTAnimatedTransitionTypePush) { // 获得即将消失的vc的v UIView *fromeView = [transitionContext viewForKey:UITransitionContextFromViewKey]; // 获得即将出现的vc的v UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey]; // 获得容器view UIView *containerView = [transitionContext containerView]; [containerView addSubview:fromeView]; [containerView addSubview:toView]; UIBezierPath *startBP = [UIBezierPath bezierPathWithOvalInRect:CGRectMake((containerView.frame.size.width-100)/2, 100, 100, 100)]; CGFloat radius = 1000; UIBezierPath *finalBP = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(150 - radius, 150 -radius, radius*2, radius*2)]; CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.path = finalBP.CGPath; toView.layer.mask = maskLayer; //执行动画 CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"path"]; animation.delegate = self; animation.fromValue = (__bridge id _Nullable)(startBP.CGPath); animation.toValue = (__bridge id _Nullable)(finalBP.CGPath); animation.duration = [self transitionDuration:transitionContext]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; [maskLayer addAnimation:animation forKey:@"path"]; } else if (self.type == JTAnimatedTransitionTypePresent) { UIView *fromeView = [transitionContext viewForKey:UITransitionContextFromViewKey]; UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey]; UIView *containerView = [transitionContext containerView]; [containerView addSubview:fromeView]; [containerView addSubview:toView]; fromeView.frame = containerView.frame; toView.frame = containerView.frame; toView.layer.anchorPoint = CGPointMake(0.0f, 1.0f); toView.frame = containerView.frame; toView.transform = CGAffineTransformMakeRotation(-M_PI/2); [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ toView.transform = CGAffineTransformIdentity; } completion:^(BOOL finished) { [self.transitionContext completeTransition:YES]; }]; } else if (self.type == JTAnimatedTransitionTypeDismiss) { UIView *fromeView = [transitionContext viewForKey:UITransitionContextFromViewKey]; UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey]; UIView *containerView = [transitionContext containerView]; [containerView addSubview:fromeView]; [containerView addSubview:toView]; fromeView.frame = containerView.frame; toView.frame = CGRectMake(containerView.frame.size.width, containerView.frame.origin.y, 0, containerView.frame.size.height); [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ fromeView.frame = CGRectMake(containerView.frame.origin.x, containerView.frame.origin.y, 0, containerView.frame.size.height); toView.frame = containerView.frame; } completion:^(BOOL finished) { [self.transitionContext completeTransition:YES]; }]; } else { }}#pragma mark - CAAnimationDelegate-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ //告诉系统转场动画完成 [self.transitionContext completeTransition:YES]; //清除相应控制器视图的mask [self.transitionContext viewForKey:UITransitionContextFromViewKey].layer.mask = nil; [self.transitionContext viewForKey:UITransitionContextToViewKey].layer.mask = nil;}@end
到这里转场动画管理者就写好了,后面我们只需要关注使用者的情况了。
2、怎么使用转场动画
现在我们创建一个使用者类。我这里就直接使用了ViewController了。下面是创建好之后的效果图。
下面就是.m的具体实现代码了,一些简单的界面搭建代码就不贴出来了。下面的代码只是一些跟转场动画有关的代码哦。
这是点击cell之后的逻辑
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ [tableView deselectRowAtIndexPath:indexPath animated:YES]; ViewControllerTwo *vc = [[ViewControllerTwo alloc]init]; UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; CGRect rectInTableView = [tableView rectForRowAtIndexPath:indexPath]; CGRect rect = [tableView convertRect:rectInTableView toView:[tableView superview]]; cell.imageView.hidden = YES; self.selectImageView.image = cell.imageView.image; self.selectImageView.frame = CGRectMake(cell.imageView.frame.origin.x, rect.origin.y, cell.imageView.frame.size.width, cell.imageView.frame.size.height); vc.img = self.selectImageView.image; vc.row = indexPath.row; [UIView animateWithDuration:0.5 animations:^{ self.selectImageView.frame = CGRectMake(0, 2, self.view.bounds.size.width/2, self.view.bounds.size.width/2); self.selectImageView.center = CGPointMake(self.view.bounds.size.width/2, 200); } completion:^(BOOL finished) { [self.navigationController pushViewController:vc animated:YES]; }];}
要实现自定义的转场,还需要使用者必须遵循UINavigationControllerDelegate协议或者, UIViewControllerTransitioningDelegate协议。根据需要的专场类型,实现自己的协议方法。
#pragma mark - pop / push- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC{ if (operation == UINavigationControllerOperationPush) { JTAnimatedTransition *animatedTransition = [JTAnimatedTransition animatedTransitionWithType:JTAnimatedTransitionTypePush]; return animatedTransition; } return nil;}- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{ if (viewController != self) { self.selectImageView.frame = CGRectNull; }}#pragma mark - present / dismiss-(id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{ return [JTAnimatedTransition animatedTransitionWithType:JTAnimatedTransitionTypePresent];}- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{ return [JTAnimatedTransition animatedTransitionWithType:JTAnimatedTransitionTypeDismiss];}
3、模态跳转
调用跳转的代码
-(void)click:(UIButton *)sender{ ViewControllerThree *vc = [[ViewControllerThree alloc]init]; [self presentViewController:vc animated:YES completion:^{ }];}调用者 ViewController 内实现了协议方法
在返回时 在 ViewControllerThree 内需要遵循 UIViewControllerTransitioningDelegate 并实现其协议方法
#import "ViewControllerThree.h"#import "JTAnimatedTransition.h"@interface ViewControllerThree ()<UIViewControllerTransitioningDelegate>@end@implementation ViewControllerThree- (void)viewDidLoad { [super viewDidLoad]; self.transitioningDelegate = self; self.title = @"模态"; self.view.backgroundColor = [UIColor lightGrayColor]; UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; btn.backgroundColor = [UIColor redColor]; [btn setTitle:@"点我返回" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn];}-(void)back{ [self dismissViewControllerAnimated:YES completion:^{ }];}#pragma mark - UIViewControllerTransitioningDelegate- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{ return [JTAnimatedTransition animatedTransitionWithType:JTAnimatedTransitionTypePresent];}- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{ return [JTAnimatedTransition animatedTransitionWithType:JTAnimatedTransitionTypeDismiss];}@end
结束语
写到这转场动画就自定义完成了。其实转场动画主要就是两个协议:1、在动画管理类内遵循UIViewControllerAnimatedTransitioning 2、在动画使用的类内遵循, UIViewControllerTransitioningDelegate以及UINavigationControllerDelegate协议,并实现其协议方法。
如果你有什么更加炫酷的动画,只需要在JTAnimatedTransition内设置动画的位置写上自己想要的动画即可。
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