iOS开发自定义转场动画

1、转场动画

　　iOS7之后开发者可以自定义界面切换的转场动画，就是在模态弹出（present、dismiss），Navigation的（push、pop），TabBar的系统切换效果之外自定义切换动画！

　　模态弹出自定义出push、pop效果，可以侧滑：

iOS开发自定义转场动画

2、实现步骤

　　2.1、自定义转场动画

　　　　1》创建自定义文件

@interface CustomTransform : NSObject<UIViewControllerAnimatedTransitioning>

　　　　2》实现UIViewControllerAnimatedTransitioning方法

//设置转场时间
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext;
//设置转场效果
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext;

　　　　.m相关类说明：

//表示转场动画上下文
UIViewControllerContextTransitioning
//当前控制器fromVC和目标控制器toVC
//vc1-->present-->vc2: fromVC是vc1，toVC是vc2
//vc2-->dismiss-->vc1: fromVC是vc2，toVC是vc1
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
//对应控制器的view视图
UIView *fromView =[transitionContext viewForKey:UITransitionContextFromViewKey];
UIView *toView =[transitionContext viewForKey:UITransitionContextToViewKey];

//presentingViewController,presentedViewController
vc1-->present-->vc2,vc1.presentedViewController 就是vc2；vc2.presentingViewController 就是vc1。

//更新动画进度
- (void)updateInteractiveTransition:(CGFloat)percentComplete;
//转场结束
- (void)finishInteractiveTransition;
//转场取消
- (void)cancelInteractiveTransition;

　　　　自定义文件：

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, PresentType){
    PresentTypePresent,
    PresentTypeDismiss
};

@interface CustomTransform : NSObject<UIViewControllerAnimatedTransitioning>

+ (instancetype)makeWithTransitionType:(PresentType)type;
- (instancetype)initWithTransitionType:(PresentType)type;


@end

.h文件