iOS开发UIEvent事件简介

1、UIEvent简介

　　UIEvent是代表iOS系统中的一个事件,一个事件包含一个或多个的UITouch；

　　UIEvent分为四类: UIEventType

typedef NS_ENUM(NSInteger, UIEventType) {

    UIEventTypeTouches,//触摸事件类型 iOS3.0之后可以用

    UIEventTypeMotion,//摇晃事件类型 iOS3.0之后可以用

    UIEventTypeRemoteControl,//遥控事件类型 iOS4.0之后可以用

    UIEventTypePresses NS_ENUM_AVAILABLE_IOS(9_0),//物理按钮事件类型 iOS9.0之后可以用

};

　　子事件类型：UIEventSubtype

typedef NS_ENUM(NSInteger, UIEventSubtype) {

    //事件没有子类型 iOS3.0之后可以用

    UIEventSubtypeNone                              = ,

    //事件子类型晃动的设备 iOS3.0之后可以用

    UIEventSubtypeMotionShake                       = ,

    //遥控的事件子类型 iOS4.0之后可以用

    UIEventSubtypeRemoteControlPlay                 = ,//播放

    UIEventSubtypeRemoteControlPause                = ,//暂停

    UIEventSubtypeRemoteControlStop                 = ,//停止

    UIEventSubtypeRemoteControlTogglePlayPause      = ,//播放和暂停之间切换【操作：播放或暂停状态下，按耳机线控中间按钮一下】

    UIEventSubtypeRemoteControlNextTrack            = ,//下一曲【操作：按耳机线控中间按钮两下】

    UIEventSubtypeRemoteControlPreviousTrack        = ,//上一曲【操作：按耳机线控中间按钮三下】

    UIEventSubtypeRemoteControlBeginSeekingBackward = ,//快退开始【操作：按耳机线控中间按钮三下不要松开】

    UIEventSubtypeRemoteControlEndSeekingBackward   = ,//快退结束【操作：按耳机线控中间按钮三下到了快退的位置松开】

    UIEventSubtypeRemoteControlBeginSeekingForward  = ,//快进开始【操作：按耳机线控中间按钮两下不要松开】

    UIEventSubtypeRemoteControlEndSeekingForward    = ,//快进结束【操作：按耳机线控中间按钮两下到了快进的位置松开】

};

2、相关API

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIEvent : NSObject

@property(nonatomic,readonly) UIEventType     type NS_AVAILABLE_IOS(3_0);//事件类型

@property(nonatomic,readonly) UIEventSubtype  subtype NS_AVAILABLE_IOS(3_0);//子事件类型

@property(nonatomic,readonly) NSTimeInterval  timestamp;//事件发生时间

//返回与接收器相关联的所有触摸对象。

#if UIKIT_DEFINE_AS_PROPERTIES

@property(nonatomic, readonly, nullable) NSSet <UITouch *> *allTouches;

#else

- (nullable NSSet <UITouch *> *)allTouches;

#endif

- (nullable NSSet <UITouch *> *)touchesForWindow:(UIWindow *)window;//返回属于一个给定视图的触摸对象，用于表示由接收器所表示的事件。

- (nullable NSSet <UITouch *> *)touchesForView:(UIView *)view;//返回属于一个给定窗口的接收器的事件响应的触摸对象。

- (nullable NSSet <UITouch *> *)touchesForGestureRecognizer:(UIGestureRecognizer *)gesture NS_AVAILABLE_IOS(3_2);//返回触摸对象被传递到特殊手势识别

//会将丢失的触摸放到一个新的 UIEvent 数组中，你可以用 coalescedTouchesForTouch(_:) 方法来访问

- (nullable NSArray <UITouch *> *)coalescedTouchesForTouch:(UITouch *)touch NS_AVAILABLE_IOS(9_0);

//辅助UITouch的触摸，预测发生了一系列主要的触摸事件。这些预测可能不完全匹配的触摸的真正的行为，因为它的移动，所以他们应该被解释为一个估计。

- (nullable NSArray <UITouch *> *)predictedTouchesForTouch:(UITouch *)touch NS_AVAILABLE_IOS(9_0);

@end

3、触摸事件示例

　　相关方法：

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;

- (void)touchesEstimatedPropertiesUpdated:(NSSet<UITouch *> *)touches NS_AVAILABLE_IOS(9_1);

　　拖动和移动效果图：

　　代码展示：

//拖动视图

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];

    CGPoint currPoint = [touch locationInView:self.view];

    CGPoint prePoint = [touch previousLocationInView:self.view];

    CGRect frame = self.btnView.frame;

    frame.origin.x += currPoint.x -prePoint.x;

    frame.origin.y += currPoint.y -prePoint.y;

    self.btnView.frame = frame;

}

//点击移动

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];

    CGRect frame = self.btnView.frame;

    frame.origin = [touch locationInView:self.view];

    self.btnView.frame = frame;

}

4、摇晃事件示例

　　相关方法：

- (void)motionBegan:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);

- (void)motionEnded:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(3_0);

　　效果图：模拟器摇一摇「Hardware」-「Shake Gesture」来测试，快捷键：command+control+z

　　摇一摇显示随机图片：

@implementation MotionImageView

- (instancetype)initWithFrame:(CGRect)frame{

    self = [super initWithFrame:frame];

    if (self) {

        self.image = [self getImage];

    }

    return self;

}

- (BOOL)canBecomeFirstResponder{

    return YES;

}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{

    if (motion == UIEventSubtypeMotionShake) {

        self.image = [self getImage];

    }

}

- (UIImage *)getImage{

    int index = arc4random() % +;

    NSString *imageName = [NSString stringWithFormat:@"pic%i.png",index];

    UIImage *image = [UIImage imageNamed:imageName];

    return image;

}

@end

　　在ViewController中使用：

//成为第一响应者

- (void)viewDidAppear:(BOOL)animated{

    [self.imageView becomeFirstResponder];

}

//注销第一响应者

- (void)viewDidDisappear:(BOOL)animated{

    [self.imageView resignFirstResponder];

}

//支持摇一摇功能

- (void)viewDidLoad {

    [super viewDidLoad];

    [UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;

}

5、遥控事件示例

　　相关方法：

- (void)remoteControlReceivedWithEvent:(nullable UIEvent *)event NS_AVAILABLE_IOS(4_0);

　　代码实现：

#import "VideoViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface VideoViewController ()

{

    UIButton *_playButton;

    BOOL _isPlaying;

    AVPlayer    *_player;

}

@end

@implementation VideoViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    [self initLayout];

}

- (BOOL)canBecomeFirstResponder{

    return NO;

}

- (void)viewDidAppear:(BOOL)animated{

    [super viewDidAppear:animated];

    NSURL *url = [NSURL URLWithString:@"http://music.163.com/song/media/outer/url?id=1293886117.mp3"];

    _player = [[AVPlayer alloc] initWithURL:url];

}

#pragma mark 远程控制事件

- (void)remoteControlReceivedWithEvent:(UIEvent *)event{

    if(event.type == UIEventTypeRemoteControl){

        switch (event.subtype) {

            case UIEventSubtypeRemoteControlPlay:

                [_player play];

                _isPlaying = true;

                NSLog(@"播放");

                break;

            case UIEventSubtypeRemoteControlTogglePlayPause:

                [self btnClick:_playButton];

                NSLog(@"播放和暂停之间切换【操作：播放或暂停状态下，按耳机线控中间按钮一下】");

                break;

            case UIEventSubtypeRemoteControlNextTrack:

                NSLog(@"下一曲【操作：按耳机线控中间按钮两下】");

                break;

            case UIEventSubtypeRemoteControlPreviousTrack:

                NSLog(@"上一曲【操作：按耳机线控中间按钮三下】");

                break;

            case UIEventSubtypeRemoteControlBeginSeekingForward:

                NSLog(@"快进开始【操作：按耳机线控中间按钮两下不要松开】");

                break;

            case UIEventSubtypeRemoteControlEndSeekingForward:

                NSLog(@"快进结束【操作：按耳机线控中间按钮两下到了快进的位置松开】");

                break;

            case UIEventSubtypeRemoteControlBeginSeekingBackward:

                NSLog(@"快退开始【操作：按耳机线控中间按钮三下不要松开】");

                break;

            case UIEventSubtypeRemoteControlEndSeekingBackward:

                NSLog(@"快退结束【操作：按耳机线控中间按钮三下到了快退的位置松开】");

                break;

            case UIEventSubtypeRemoteControlStop:

                NSLog(@"停止");

                break;

            case UIEventSubtypeRemoteControlPause:

                NSLog(@"暂停");

                break;

            default:

                break;

        }

        [self changeUIState];

    }

}

#pragma mark 界面布局

- (void)initLayout{

    //专辑封面

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds];

    imageView.image = [UIImage imageNamed:@"pic1.jpg"];

    imageView.contentMode = UIViewContentModeScaleAspectFill;

    [self.view addSubview:imageView];

    //播放控制面板

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, )];

    view.backgroundColor = [UIColor yellowColor];

    view.alpha = 0.9;

    [self.view addSubview:view];

    //添加播放按钮

    _playButton = [UIButton buttonWithType:UIButtonTypeCustom];

    _playButton.bounds = CGRectMake(, , , );

    _playButton.center = CGPointMake(CGRectGetWidth(view.frame)/,CGRectGetHeight(view.frame)/);

    [self changeUIState];

    [_playButton addTarget:self

                    action:@selector(btnClick:)

          forControlEvents:UIControlEventTouchUpInside];

    [view addSubview:_playButton];

}

#pragma mark 界面状态

- (void)changeUIState{

    if(_isPlaying){

        UIImage *pauseImage = [UIImage imageNamed:@"pic2.png"];

        [_playButton setImage:pauseImage forState:UIControlStateNormal];

    }else{

        UIImage *playImage = [UIImage imageNamed:@"pic3.png"];

        [_playButton setImage:playImage forState:UIControlStateNormal];

    }

}

- (void)btnClick:(UIButton *)btn{

    if (_isPlaying) {

        [_player pause];

    }else{

        [_player play];

    }

    _isPlaying =! _isPlaying;

    [self changeUIState];

}

@end

线控代码实现

　　号外1：获取网易云mp3路径

　　号外2：后台播放音乐

- (void)applicationWillResignActive:(UIApplication *)application {

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    AVAudioSession *session = [AVAudioSession sharedInstance];

    [session setActive:YES error:nil];

    [session setCategory:AVAudioSessionCategoryPlayback error:nil];

}

6、物理按钮示例

　　按压事件代表了对一个游戏控制器,苹果TV远程,或其他有物理按钮的设备之间的交互。；

　　所以对于iPhone的手机而言在没有物理按键连接的情况下,是无法触发该事件的；

　　相关方法：

//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

　　UIPress相关API

NS_ENUM_AVAILABLE_IOS(9_0) typedef NS_ENUM(NSInteger, UIPressPhase) {

    UIPressPhaseBegan,         // 开始

    UIPressPhaseChanged,       // 变化

    UIPressPhaseStationary,    // 按下不动时

    UIPressPhaseEnded,         // 结束

    UIPressPhaseCancelled,     // 取消

};

NS_ENUM_AVAILABLE_IOS(9_0) typedef NS_ENUM(NSInteger, UIPressType) {

    UIPressTypeUpArrow,     //向上的键被按压

    UIPressTypeDownArrow,   //向下的键被按压

    UIPressTypeLeftArrow,   //向左的键被按压

    UIPressTypeRightArrow,  //向右的键被按压

    UIPressTypeSelect,      //选择 的键被按压

    UIPressTypeMenu,        //菜单 的键被按压

    UIPressTypePlayPause,   //播放/暂停 的键被按压

};

NS_CLASS_AVAILABLE_IOS(9_0) @interface UIPress : NSObject

@property(nonatomic,readonly) NSTimeInterval   timestamp;   //时间

@property(nonatomic,readonly) UIPressPhase     phase;       //按下阶段

@property(nonatomic,readonly) UIPressType      type;        //按下的类型

@property(nullable,nonatomic,readonly,strong) UIWindow                        *window; //所处视图

@property(nullable,nonatomic,readonly,strong) UIResponder                     *responder;//

@property(nullable,nonatomic,readonly,copy)   NSArray <UIGestureRecognizer *> *gestureRecognizers;//手势

@property(nonatomic, readonly) CGFloat force; //按钮按压的力 返回一个介于0和1之间的值。数字按钮返回0或1。

巴特西

iOS开发UIEvent事件简介

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