UIDynamicBehavior.h

#if USE_UIKIT_PUBLIC_HEADERS || !__has_include(<UIKitCore/UIDynamicBehavior.h>)
//
//  UIDynamicBehavior.h
//  UIKit
//
//  Copyright (c) 2012-2018 Apple Inc. All rights reserved.
//

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

NS_ASSUME_NONNULL_BEGIN
@class UIDynamicAnimator;
@class UIBezierPath;



/* 碰撞边界类型 <枚举> */
typedef NS_ENUM(NSUInteger, UIDynamicItemCollisionBoundsType) {
    UIDynamicItemCollisionBoundsTypeRectangle,  /// 矩形碰撞边界
    UIDynamicItemCollisionBoundsTypeEllipse,    /// 椭圆碰撞边界 (椭圆的形状由项目边界属性的宽度和高度决定)
    UIDynamicItemCollisionBoundsTypePath        /// 基于路径的碰撞边界 (此类型shape是存储在Item的collisionBoundingPath属性中的UIBezierPath对象)
} NS_ENUM_AVAILABLE_IOS(9_0);



///!!!: 动态项设置 <协议>
@protocol UIDynamicItem <NSObject>

/// 中心点
@property (nonatomic, readwrite) CGPoint center;
/// 尺寸
@property (nonatomic, readonly) CGRect bounds;
/// 旋转
@property (nonatomic, readwrite) CGAffineTransform transform;

@optional
/// 碰撞边界类型 (默认:UIDynamicItemCollisionBoundsTypeRectangle)
@property (nonatomic, readonly) UIDynamicItemCollisionBoundsType collisionBoundsType NS_AVAILABLE_IOS(9_0);
/// 贝塞尔路径碰撞边界
@property (nonatomic, readonly) UIBezierPath *collisionBoundingPath NS_AVAILABLE_IOS(9_0);

@end





#pragma mark - 一组动态项 Class
#pragma mark -
NS_CLASS_AVAILABLE_IOS(9_0) @interface UIDynamicItemGroup : NSObject <UIDynamicItem>

#pragma mark |实例化|
- (instancetype)initWithItems:(NSArray<id <UIDynamicItem>> *)items;

/// 动态项组所包含的所有动态项
@property (nonatomic, readonly, copy) NSArray<id <UIDynamicItem>> *items;

@end





#pragma mark - 动态行为管理器 Class
#pragma mark -
/*
 概述
 - 对一个或多个动态项目赋予行为配置的对象,用于参与2D动画
 */
NS_CLASS_AVAILABLE_IOS(7_0) @interface UIDynamicBehavior : NSObject

// 添加自定义动态行为
- (void)addChildBehavior:(UIDynamicBehavior *)behavior;
// 删除指定动态行为
- (void)removeChildBehavior:(UIDynamicBehavior *)behavior;

/// 获取所有已添加的动态行为
@property (nonatomic, readonly, copy) NSArray<__kindof UIDynamicBehavior *> *childBehaviors;
/// 动态行为每个动画执行步骤的回调
@property (nullable, nonatomic,copy) void (^action)(void);

// 添加/删除动态行为时调用(删除动态行为时为nil)
- (void)willMoveToAnimator:(nullable UIDynamicAnimator *)dynamicAnimator;

/// 与动态行为关联的动态动画管理器
@property (nullable, nonatomic, readonly) UIDynamicAnimator *dynamicAnimator;

@end





NS_ASSUME_NONNULL_END
#else
#import <UIKitCore/UIDynamicBehavior.h>
#endif