iOS开发UIResponder简介API

#import <Foundation/Foundation.h>
#import <UIKit/UIKitDefines.h>
#import <UIKit/UIEvent.h>
#import <UIKit/UIPasteConfigurationSupporting.h>

NS_ASSUME_NONNULL_BEGIN

@class UIPress;
@class UIPressesEvent;
//响应者类的按键命令类类目
@protocol UIResponderStandardEditActions <NSObject>
@optional
- (void)cut:(nullable id)sender NS_AVAILABLE_IOS(3_0);//剪切
- (void)copy:(nullable id)sender NS_AVAILABLE_IOS(3_0);//复制
- (void)paste:(nullable id)sender NS_AVAILABLE_IOS(3_0);//粘贴
- (void)select:(nullable id)sender NS_AVAILABLE_IOS(3_0);//选择
- (void)selectAll:(nullable id)sender NS_AVAILABLE_IOS(3_0);//选择全部
- (void)delete:(nullable id)sender NS_AVAILABLE_IOS(3_2);//删除
- (void)makeTextWritingDirectionLeftToRight:(nullable id)sender NS_AVAILABLE_IOS(5_0);//从左到右写入字符串
- (void)makeTextWritingDirectionRightToLeft:(nullable id)sender NS_AVAILABLE_IOS(5_0);//从右到左写入字符串
- (void)toggleBoldface:(nullable id)sender NS_AVAILABLE_IOS(6_0);//切换字体为黑体
- (void)toggleItalics:(nullable id)sender NS_AVAILABLE_IOS(6_0);//切换字体为斜体
- (void)toggleUnderline:(nullable id)sender NS_AVAILABLE_IOS(6_0);//为字体加入下划线

- (void)increaseSize:(nullable id)sender NS_AVAILABLE_IOS(7_0);//增加字体大小
- (void)decreaseSize:(nullable id)sender NS_AVAILABLE_IOS(7_0);//减小字体大小

@end

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIResponder : NSObject <UIResponderStandardEditActions>
//响应链中负责传递事件的方法
#if UIKIT_DEFINE_AS_PROPERTIES
@property(nonatomic, readonly, nullable) UIResponder *nextResponder;
#else
- (nullable UIResponder*)nextResponder;
#endif

//一个响应对象是否可以成为第一响应者,可以用这个进行判断，默认值为NO
#if UIKIT_DEFINE_AS_PROPERTIES
@property(nonatomic, readonly) BOOL canBecomeFirstResponder;    // default is NO
#else
- (BOOL)canBecomeFirstResponder;    // default is NO
#endif
//设置对象成为第一响应者，成功返回YES；否则返回NO
- (BOOL)becomeFirstResponder;

//是否可以辞去第一响应者,默认值为YES
#if UIKIT_DEFINE_AS_PROPERTIES
@property(nonatomic, readonly) BOOL canResignFirstResponder;    // default is YES
#else
- (BOOL)canResignFirstResponder;    // default is YES
#endif
//辞去第一响应者 成功返回YES；否则返回NO
- (BOOL)resignFirstResponder;

//判定一个响应对象是否是第一响应者
#if UIKIT_DEFINE_AS_PROPERTIES
@property(nonatomic, readonly) BOOL isFirstResponder;
#else
- (BOOL)isFirstResponder;
#endif

//响应触摸事件
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;//手指按下的时候调用
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;//手指移动的时候调用
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;//手指抬起的时候调用
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;//取消(非正常离开屏幕,意外中断)
- (void)touchesEstimatedPropertiesUpdated:(NSSet<UITouch *> *)touches NS_AVAILABLE_IOS(9_1);// Apple Pencil 产生的 touch 事件的部分信息（如 Pencil 的方向等）传递到 iPad 或 iPhone 上会有一定的延时。
//UIKit 的回调方法 touchBegan 是立即产生的，其返回的参数 touch 中包含了 Pencil 产生的额外信息，这个额外信息是有延时的。所以，首次回调时会给出额外信息的预估值，延时获取真实值之后会调用 touchesEstimatedPropertiesUpdated 方法更新额外信息。

//物理按钮 深按API，一般用于遥控器
- (void)pressesBegan:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);// 开始按压的时候调用
- (void)pressesChanged:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);// 按压改变的时候调用
- (void)pressesEnded:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);// 按压结束的时候调用
- (void)pressesCancelled:(NSSet<UIPress *> *)presses withEvent:(nullable UIPressesEvent *)event NS_AVAILABLE_IOS(9_0);// 当系统发出取消按压事件的时候调用

//响应移动事件
- (void)motionBegan:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);//移动事件开始
- (void)motionEnded:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);//移动事件结束
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);//移动事件取消

//响应远程控制事件 一般用于耳机
- (void)remoteControlReceivedWithEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(4_0);

//通过这个方法告诉UIMenuController它内部应该显示什么内容,”复制”、”粘贴”等
- (BOOL)canPerformAction:(SEL)action withSender:(nullable id)sender NS_AVAILABLE_IOS(3_0);
////默认的实现是调用canPerformAction:withSender:方法来确定对象是否可以调用action操作。如果我们想要重写目标的选择方式，则应该重写这个方法。
- (nullable id)targetForAction:(SEL)action withSender:(nullable id)sender NS_AVAILABLE_IOS(7_0);

//UIResponder提供了一个只读方法来获取响应链中共享的undo管理器，公共的事件撤销管理者
@property(nullable, nonatomic,readonly) NSUndoManager *undoManager NS_AVAILABLE_IOS(3_0);

@end

//定义一个响应者支持的快捷键
typedef NS_OPTIONS(NSInteger, UIKeyModifierFlags) {
    UIKeyModifierAlphaShift     = 1 << 16,// Alppha+Shift键
    UIKeyModifierShift          = 1 << 17,//Shift键
    UIKeyModifierControl        = 1 << 18,//Control键
    UIKeyModifierAlternate      = 1 << 19,//Alt键
    UIKeyModifierCommand        = 1 << 20,//Command键
    UIKeyModifierNumericPad     = 1 << 21,//Num键
} NS_ENUM_AVAILABLE_IOS(7_0);

NS_CLASS_AVAILABLE_IOS(7_0) @interface UIKeyCommand : NSObject <NSCopying, NSSecureCoding>

- (instancetype)init NS_DESIGNATED_INITIALIZER;
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;
//输入字符串
@property (nullable,nonatomic,readonly) NSString *input;
//按键调节器
@property (nonatomic,readonly) UIKeyModifierFlags modifierFlags;
//按指定调节器键输入字符串并设置事件
@property (nullable,nonatomic,copy) NSString *discoverabilityTitle NS_AVAILABLE_IOS(9_0);

// The action for UIKeyCommands should accept a single (id)sender, as do the UIResponderStandardEditActions above

// Creates an key command that will _not_ be discoverable in the UI.
+ (UIKeyCommand *)keyCommandWithInput:(NSString *)input modifierFlags:(UIKeyModifierFlags)modifierFlags action:(SEL)action;

// Key Commands with a discoverabilityTitle _will_ be discoverable in the UI.
+ (UIKeyCommand *)keyCommandWithInput:(NSString *)input modifierFlags:(UIKeyModifierFlags)modifierFlags action:(SEL)action discoverabilityTitle:(NSString *)discoverabilityTitle NS_AVAILABLE_IOS(9_0);

@end

@interface UIResponder (UIResponderKeyCommands)
@property (nullable,nonatomic,readonly) NSArray<UIKeyCommand *> *keyCommands NS_AVAILABLE_IOS(7_0); // returns an array of UIKeyCommand objects<
@end

@class UIInputViewController;
@class UITextInputMode;
@class UITextInputAssistantItem;

@interface UIResponder (UIResponderInputViewAdditions)

//键盘输入视图(系统默认的,可以自定义)
@property (nullable, nonatomic, readonly, strong) __kindof UIView *inputView NS_AVAILABLE_IOS(3_2);
//弹出键盘时附带的视图
@property (nullable, nonatomic, readonly, strong) __kindof UIView *inputAccessoryView NS_AVAILABLE_IOS(3_2);

/// This method is for clients that wish to put buttons on the Shortcuts Bar, shown on top of the keyboard.
/// You may modify the returned inputAssistantItem to add to or replace the existing items on the bar.
/// Modifications made to the returned UITextInputAssistantItem are reflected automatically.
/// This method should not be overriden. Goes up the responder chain.
@property (nonnull, nonatomic, readonly, strong) UITextInputAssistantItem *inputAssistantItem NS_AVAILABLE_IOS(9_0) __TVOS_PROHIBITED __WATCHOS_PROHIBITED;

//键盘输入视图控制器 IOS8以后
@property (nullable, nonatomic, readonly, strong) UIInputViewController *inputViewController NS_AVAILABLE_IOS(8_0);
//弹出键盘时附带的视图的视图控制器 IOS8以后
@property (nullable, nonatomic, readonly, strong) UIInputViewController *inputAccessoryViewController NS_AVAILABLE_IOS(8_0);

//文本输入模式
@property (nullable, nonatomic, readonly, strong) UITextInputMode *textInputMode NS_AVAILABLE_IOS(7_0);
//文本输入模式标识
@property (nullable, nonatomic, readonly, strong) NSString *textInputContextIdentifier NS_AVAILABLE_IOS(7_0);
//根据设置的标识清除指定的文本输入模式
+ (void)clearTextInputContextIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(7_0);

//重新刷新键盘输入视图
- (void)reloadInputViews NS_AVAILABLE_IOS(3_2);

@end

// 按键输入箭头指向
UIKIT_EXTERN NSString *const UIKeyInputUpArrow         NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputDownArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputLeftArrow       NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputRightArrow      NS_AVAILABLE_IOS(7_0);
UIKIT_EXTERN NSString *const UIKeyInputEscape          NS_AVAILABLE_IOS(7_0);

@interface UIResponder (ActivityContinuation)
//用户活动
@property (nullable, nonatomic, strong) NSUserActivity *userActivity NS_AVAILABLE_IOS(8_0);
//更新用户活动
- (void)updateUserActivityState:(NSUserActivity *)activity NS_AVAILABLE_IOS(8_0);
//恢复用户活动
- (void)restoreUserActivityState:(NSUserActivity *)activity NS_AVAILABLE_IOS(8_0);
@end

#if TARGET_OS_IOS
@interface UIResponder (UIPasteConfigurationSupporting) <UIPasteConfigurationSupporting>
@end
#endif

NS_ASSUME_NONNULL_END