iOS事件:触摸事件.运动事件.远程控制事件

iOS中,提供了事件处理:触摸事件,运动事件,远程控制事件.这很大得方便程序猿的工作.

这里先简单做个介绍:

 //
 //  ViewController.m
 //  demo
 //
 //  Created by shaoting on 15/11/23.
 //  Copyright © 2015年 9elephas. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController
 /**
  *  IOS事件分类:1,触摸事件2,运动事件3,远程控制事件
  1.触摸事件:触碰屏幕
  2.运动事件:通过加速器触发(如晃动手机)
  3.远程控制事件:通过其他设备远程控制(如蓝牙)
  在iOS中,只有继承自UIResponder类的对象才能触发事件
  */
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.title = @"iOS事件";
     self.view.backgroundColor = [UIColor whiteColor];
     //开个图
     UIImage * image = [UIImage imageNamed:@"屏幕快照 2015-11-23 17.37.19"];
     self.imageView = [[UIImageView  alloc]initWithFrame:CGRectMake(, , , )];
     self.imageView.image = image;
     [self.view setBackgroundColor:[UIColor colorWithPatternImage:image]]; //view的背景色使用image
     [self.view addSubview:_imageView];
 }
 //触摸事件
 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
     NSLog(@"一根手指或多根手指触摸时触发");
     UITouch * touch = [touches anyObject]; //获得任意触摸对象
     NSLog(@"触摸对象%@",touch);
     CGPoint current = [touch locationInView:self.view];//获得当前的触摸对象
     NSLog(@"当前的触摸对象%@",NSStringFromCGPoint(current));  //把CGPoint对象转换为字符串对象
 }
 -(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
     NSLog(@"一根或者多根手指离开屏幕时触发");
 }
 //以图片随鼠标移动为例
 -(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
     NSLog(@"一根或者多根手指移动时触发");
     UITouch * touch = [touches anyObject];
     CGPoint current = [touch locationInView:self.view];//当前位置
     CGPoint previous = [touch previousLocationInView:self.view];//当前位置的前一个位置
     CGPoint center = _imageView.center;//移动前的中心位置
     CGPoint offset = CGPointMake(current.x - previous.x, current.y - previous.y);
     _imageView.center = CGPointMake(center.x+offset.x, center.y+offset.y);
     NSUInteger count = touch.tapCount;//短时间内点击的次数
     NSLog(@"短时间内点击的次数%ld",count);
     UITouchPhase phase = touch.phase;//触摸周期内的各个状态
     NSLog(@"触摸周期内的各个状态%ld",phase);
     NSTimeInterval  tamp = touch.timestamp;//触摸产生或者变化的时间戳
     NSLog(@"触摸产生或者变化的时间戳%f",tamp);
     UIView * view = touch.view; //触摸时所在的视图
     NSLog(@"触摸时所在的视图%@",view);
     UIWindow * window = touch.window;//触摸时所在的window
     NSLog(@"触摸时所在的window%@",window);
 }
 //运动事件
 -(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
     NSLog(@"运动开始时触发");
 }
 -(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
     NSLog(@"运动结束时触发");
 }
 -(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{
     NSLog(@"运动被意外取消时触发");
 }
 //远程控制事件
 -(void)remoteControlReceivedWithEvent:(UIEvent *)event{
     NSLog(@"接收到远程控制消息时执行");
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

其中,模拟器开启晃动手机的功能键是:

触摸事件:

 //
 //  ViewController.m
 //  demo1
 //
 //  Created by shaoting on 15/11/23.
 //  Copyright © 2015年 9elephas. All rights reserved.
 //

 #import "ViewController.h"
 #define Hight [UIScreen mainScreen].bounds.size.height-49
 #define Width [UIScreen mainScreen].bounds.size.width

 @interface ViewController ()<UIGestureRecognizerDelegate>{
     int _count;
 }
 @end

 @implementation ViewController
 /**
  *  复杂手势:6种
  点按手势:UITapGestureRecognizer
  捏合手势:UIPinchGestureRecognizer
  拖动手势:UIPanGetureRecognizer
  清扫手势:UISwipeGetureRecognizer
  旋转手势:UIRotationGetureReconizer
  长按手势:UILongPressGetureReconizer
  6种手势中点按手势属于离散型手势(不用判断状态),其余手势属于连续手势(除清扫手势外均需要判断状态).

  各手势的触发时机:点按事件:点击屏幕然后松开时触发
                   长按事件:长时间点击屏幕不松开即会触发(不加长按&拖动冲突解决),长时间点击屏幕松开即会触发(加长按&拖动手势冲突解决ß)
                   拖动事件:手指在屏幕上拖动时触发
                   旋转手势:手指在屏幕上旋转时触发
                   清扫手势:只在清扫完毕(手指清扫屏幕离开屏幕时)才会触发
                   捏合手势:手指捏合时触发

  事件冲突:点击手势会和旋转手势会发生冲突.
           清扫手势会和拖动手势会发生冲突.

  */
 - (void)viewDidLoad {
     [super viewDidLoad];
     [self initLayout];
     [self addGesture];

     // Do any additional setup after loading the view, typically from a nib.
 }
 //布局
 -(void)initLayout{
     _imageView = [[UIImageView alloc]initWithFrame:CGRectMake(, , Width, Hight)];
     _imageView.userInteractionEnabled = YES;   //必须设置为YES,否则无法就收手势操作
     UIImage * image = [UIImage imageNamed:@""];
     _imageView.image = image;
     self.title = @"";
     [self.view addSubview:_imageView];
 }
 //添加手势
 -(void)addGesture{
     UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];
     tap.numberOfTapsRequired = ; //设置点击次数,默认为1
     tap.numberOfTouchesRequired = ;//设置为手指数
     [self.view addGestureRecognizer:tap];//添加手势进视图控制器上的视图

     UIPinchGestureRecognizer * pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)];
     [self.view addGestureRecognizer:pinch];

     UIPanGestureRecognizer * pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
     [self.view addGestureRecognizer:pan];

     UISwipeGestureRecognizer * left = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
     left.direction = UISwipeGestureRecognizerDirectionLeft;
     [self.view addGestureRecognizer:left];
     UISwipeGestureRecognizer * right = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];
     right.direction = UISwipeGestureRecognizerDirectionRight;
     [self.view addGestureRecognizer:right];

     UIRotationGestureRecognizer * rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];
     [self.view addGestureRecognizer:rotation];

     UILongPressGestureRecognizer * longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
     [self.view addGestureRecognizer:longPress];

     //手势冲突解决
     [pan requireGestureRecognizerToFail:left];
     [pan requireGestureRecognizerToFail:right];//解决拖动手势和清扫手势的冲突
     [longPress requireGestureRecognizerToFail:pan];//解决长按手势和拖动手势的冲突

     //多种手势在不同视图上的同时执行
     //iOS默认只会触发一次,因为触发是沿着响应者链依次匹配,只要匹配到响应就会停止.可以修改- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer的返回值,默认返回NO
     //上面演示了添加长按手势进视图控制器视图上,下面再添加长按手势到_imageView上,让这两个手势可以同时在不同视图上执行.
     UILongPressGestureRecognizer * longpress1 = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress1:)];
     longpress1.delegate = self;
     [_imageView addGestureRecognizer:longpress1];

 }
 //点按事件
 //点按是否显示状态栏
 -(void)tap:(UITapGestureRecognizer *)tap{
     BOOL recognizer = !self.navigationController.navigationBarHidden;
     [self.navigationController setNavigationBarHidden:recognizer];
 }
 //捏合事件
 //缩放图片
 -(void)pinch:(UIPinchGestureRecognizer *)pinch{
 //    NSLog(@"%ld",(long)pinch.state); //  捏合状态
     //状态:0--未开始   1--手势开始   2--手势进行  3--手势完成
 //    typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
 //        UIGestureRecognizerStatePossible,   // 尚未识别是何种手势操作（但可能已经触发了触摸事件），默认状态
 //
 //        UIGestureRecognizerStateBegan,      // 手势已经开始，此时已经被识别，但是这个过程中可能发生变化，手势操作尚未完成
 //        UIGestureRecognizerStateChanged,    // 手势状态发生转变
 //        UIGestureRecognizerStateEnded,      // 手势识别操作完成（此时已经松开手指）
 //        UIGestureRecognizerStateCancelled,  // 手势被取消，恢复到默认状态
 //
 //        UIGestureRecognizerStateFailed,     // 手势识别失败，恢复到默认状态
 //
 //        UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded // 手势识别完成，同UIGestureRecognizerStateEnded
 //    };
     if (pinch.state == UIGestureRecognizerStateChanged) {
         _imageView.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale); //.scele记录缩放属性
     }else if(pinch.state == UIGestureRecognizerStateEnded){ //缩放完毕后恢复
         [UIView animateWithDuration: animations:^{
             _imageView.transform = CGAffineTransformIdentity;//取消形变
         }];
     }
 }
 //拖动手势
 -(void)pan:(UIPanGestureRecognizer *)pan{

     if (pan.state == UIGestureRecognizerStateChanged) {
         CGPoint transform = [pan translationInView:self.view];//利用translationInView:取得在相对视图中的移动
         _imageView.transform = CGAffineTransformMakeTranslation(transform.x, transform.y);
     }else if(pan.state == UIGestureRecognizerStateEnded){
         [UIView animateWithDuration: animations:^{
             _imageView.transform = CGAffineTransformIdentity;
         }];
     }
 }

 //清扫手势
 -(void)swipe:(UISwipeGestureRecognizer *)swipe{
   //因为清扫手势虽然是连续手势,但是只有在清扫完毕时才会触发,所以不用判断状态
     if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
         [self nextImage];
     }
     if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
         [self lastImage];
     }
 }
 -(void)nextImage{
     int index=(_count++)%;
     NSString *imageName=[NSString stringWithFormat:@"%i",index];
     _imageView.image=[UIImage imageNamed:imageName];
     _count=index;
     [self showName];
 }
 -(void)lastImage{
     int index=(_count+-)%;
     NSString *imageName=[NSString stringWithFormat:@"%i",index];
     _imageView.image=[UIImage imageNamed:imageName];
     _count=index;
     [self showName];

 }
 -(void)showName{
     NSString * name = [NSString stringWithFormat:@"%i",_count];
     self.title  = name;
 }
 //旋转事件
 //旋转使图片旋转
 -(void)rotation:(UIRotationGestureRecognizer *)rotation{
     if (rotation.state == UIGestureRecognizerStateChanged) {
         _imageView.transform = CGAffineTransformMakeRotation(rotation.rotation);// .rotation记录了改变的弧度
     }else if(rotation.state == UIGestureRecognizerStateEnded){
         [UIView animateWithDuration: animations:^{
             _imageView.transform = CGAffineTransformIdentity;
         }];
     }
 }
 //长按事件
 -(void)longPress:(UILongPressGestureRecognizer *)longPress{
     //长按选择是否下载图片
     if (longPress.state == UIGestureRecognizerStateBegan) {
         UIAlertController * alterC = [UIAlertController alertControllerWithTitle:@"提示" message:@"是否下载该图片" preferredStyle:UIAlertControllerStyleActionSheet];
         UIAlertAction * cance = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
         UIAlertAction * down = [UIAlertAction actionWithTitle:@"下载" style:UIAlertActionStyleDefault handler:nil];
         [alterC addAction:cance];
         [alterC addAction:down];
         [self presentViewController:alterC animated:YES completion:nil];

     }
 }
 -(void)longPress1:(UILongPressGestureRecognizer *)longpress{
     NSLog(@"添加手势进_imageView");
 }
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
     if ([otherGestureRecognizer.view isKindOfClass:[self.view class]]) {//如果是控制器视图则继续沿着响应者链传播
         return YES;
     }
     return NO;
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

运动事件:

监听运动事件对于UI控件有个前提就是监听对象必须是第一响应者（对于UIViewController视图控制器和UIAPPlication没有此要求）。这也就意味着如果监听的是一个UI控件那么-(BOOL)canBecomeFirstResponder;方法必须返回YES。同时控件显示时（在-(void)viewWillAppear:(BOOL)animated;事件中）调用视图控制器的becomeFirstResponder方法。当视图不再显示时（在-(void)viewDidDisappear:(BOOL)animated;事件中）注销第一响应者身份。(是真的吗?)

 //
 //  ViewController.m
 //  demo2
 //
 //  Created by shaoting on 15/11/25.
 //  Copyright © 2015年 9elephas. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController (){
     UIImageView * _imageView;
 }

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
      _imageView = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];
     _imageView.image = [UIImage imageNamed:@""];
     [self.view addSubview:_imageView];
 }

 #pragma mark 运动开始
 -(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
     NSLog(@"运动开始了");
     //这里只处理摇晃事件
     if (motion==UIEventSubtypeMotionShake) {
         _imageView.image=[self getImage];
     }
 }
 #pragma mark 运动结束
 -(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
     NSLog(@"运动结束了");
 }
 -(UIImage *)getImage{
     int index= arc4random()%;
     NSString *imageName=[NSString stringWithFormat:@"%i",index];
     UIImage *image=[UIImage imageNamed:imageName];
     return image;
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

远程控制事件:

这里有点问题,以后再写吧.