事件分类：晃动、触摸、远程控制（如遥控器、红外控制）
触摸开始时候的方法（判断单击，双击，三击事件可以写在这里）
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{}
//触摸开始时候的方法 （） -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"触摸开始"); //点击的时候随机改变背景颜色 // [self changeSelColor]; //touches 存储触摸屏幕时的手指对象 //UITouch 表示是一个手指类,每一个手指对象都是一个 UITouch 类型的对象 //1.取出手指对象 UITouch * aTouch = [touches anyObject]; //2.根据点击的次数来进行相应的处理 if (aTouch.tapCount == 0) { NSLog(@"0");//这里的永远不会打印出来，因为，触摸必定会点击到屏幕 } if ( aTouch.tapCount == 1) { // [self changeSelColor]; //让单击操作延迟。看是否有双击事件操作 [self performSelector:@selector(changeSelColor) withObject:nil afterDelay:0.3]; } if (aTouch.tapCount == 2) { [self changFatherColor]; //双击操作的时候，取消改变自身颜色的操作 [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(changeSelColor) object:nil]; } if (aTouch.tapCount == 3) { [self changSelfStation];//点击3次，改变自身的位置 } }
手指还没有离开屏幕时候（在屏幕上移动手指）触发
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{}
触发结束时候，手指离开屏幕的那一时刻触发
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{}
触摸中断时候要触发的方法
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{}
随机改变颜色（一般写在一个方法的分类里，方便调用）
[UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];
UIEvent:事件,是由硬件捕捉的⼀一个表⽰示⽤用户操作设备的对象。 （触摸事件、晃动事件、远程控制事件）
触摸事件:⽤用户通过触摸设备屏幕操作对象、输⼊入数据。⽀支持多点 触摸,包含1个到多个触摸点
UIView⽀支持触摸事件(因为继承于UIResponder),⽽而且⽀支持多 点触摸。
我们视图上的Button 我们的程序怎么知道我们点击了？每一个程序都是一个 UIApplication 对象
yellowView.userInteractionEnabled = NO;黄色视图的用户交互属性被关闭。
当我们查找的时候，是一层一层去查找，当我们去响应的时候，是从响应的地方开始，往上提交
代码demo
// // AppDelegate.m #import "AppDelegate.h" @interface AppDelegate () @end @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; RootViewController * rootView = [[RootViewController alloc]init]; self.window.rootViewController = rootView; [rootView release]; return YES; } -(void)dealloc{ [self release]; [super dealloc]; }
#import <UIKit/UIKit.h> @interface PinchView : UIView @end
View Code PinchView.h
// // PinchView.m #import "PinchView.h" //捏合效果(在 touchesMoved 里面实现) @implementation PinchView //IOS 支出多点触控，只不过默认的是开启单点触控 //重写初始化方法，修改为支持多点触控 -(instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.multipleTouchEnabled = YES;//支持多点触摸 } return self; } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ //一旦发现是用一个手指在操作的话，则不进行下面的捏合操作 if (touches.count == 1) { return ;//结束下面的代码 （return 后面的代码永远不会被编译到） } //1.获取触摸屏的两个手指对象 NSArray * allTouches = [touches allObjects]; UITouch * firstTouch = [allTouches firstObject];//取出第一个手指对象 UITouch * secondTouch = [allTouches lastObject];//取出第二个手指对象 //2.获取捏合后手指的位置 CGPoint currentPoint1 = [firstTouch locationInView:self]; CGPoint currentPoint2 = [secondTouch locationInView:self]; //3.获取手指捏合后的距离 CGFloat currentDistance = [self destanceBetweenPoint1:currentPoint1 Ponit2:currentPoint2]; //4.获取捏合之前的手指的位置 CGPoint previousPoint1 = [firstTouch previousLocationInView:self]; CGPoint previousPoint2 = [secondTouch previousLocationInView:self]; //5.获取捏合之前的两手指之间的距离 CGFloat previousDistance = [self destanceBetweenPoint1:previousPoint1 Ponit2:previousPoint2]; //6.缩放比 (捏合后和捏合前的比例) CGFloat scale = currentDistance/previousDistance; //7.修改视图的大小 修改 bounds 保持中心点不变 self.bounds = CGRectMake(0, 0, self.frame.size.width*scale, self.frame.size.height*scale); /* CGFloat ph1 = currentPoint1.y - currentPoint2.y; //捏合前的两手指位置 CGPoint previousLocation1 = [firstTouch previousLocationInView:self]; CGPoint previousLocation2 = [secondTouch previousLocationInView:self]; //捏合前的两手指距离 CGFloat ph2 = previousLocation1.y - previousLocation2.y; //计算比例 CGFloat change = ph1/ph2; //得到缩放后的效果 self.center = self.center; CGFloat w = self.frame.size.width * change; CGFloat h = self.frame.size.height * change; */ } -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{ } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ } //利用勾股定理 计算两个点之间的距离 -(CGFloat)destanceBetweenPoint1:(CGPoint )point1 Ponit2:(CGPoint )point2{ CGFloat dx = point1.x - point2.x; CGFloat dy = point1.y - point2.y; return sqrt(dx*dx + dy*dy); } @end
// // TouchView.h #import <UIKit/UIKit.h> #import "UIColor+Addition.h" #import "PanView.h" @interface TouchView : UIView -(void)changeSelColor; -(void)changFatherColor; -(void)changSelfStation; @end
// // TouchView.m #import "TouchView.h" @implementation TouchView //对于 UIView 类的视图可以接受触摸事件，但是让他响应，必须实现以下的几个方法 //单击的时候改变自己的颜色，双击的时候改变父视图的颜色 //触摸开始时候的方法 （） -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"触摸开始"); //点击的时候随机改变背景颜色 // [self changeSelColor]; //touches 存储触摸屏幕时的手指对象 //UITouch 表示是一个手指类,每一个手指对象都是一个 UITouch 类型的对象 //1.取出手指对象 UITouch * aTouch = [touches anyObject]; //2.根据点击的次数来进行相应的处理 if (aTouch.tapCount == 0) { NSLog(@"0");//这里的永远不会打印出来，因为，触摸必定会点击到屏幕 } if ( aTouch.tapCount == 1) { // [self changeSelColor]; //让单击操作延迟。看是否有双击事件操作 [self performSelector:@selector(changeSelColor) withObject:nil afterDelay:0.3]; } if (aTouch.tapCount == 2) { [self changFatherColor]; //双击操作的时候，取消改变自身颜色的操作 [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(changeSelColor) object:nil]; } if (aTouch.tapCount == 3) { [self changSelfStation];//点击3次，改变自身的位置 } } //手指还没有离开屏幕 （手指移动的时候） -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ //手指移动的时候，改变父视图的颜色 [self changFatherColor]; } //触摸中断的时候触发的事件 （例如，手机有电话了） -(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{ self.backgroundColor = [UIColor blackColor]; } //触摸结束的时候触发的事件 （手指离开屏幕的时候） -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ //x 在 100-300 y 在 100 - 500 // [self changSelfStation]; } //改变自身视图的颜色 -(void)changeSelColor{ self.backgroundColor = [UIColor randomColor]; } //改变父视图的颜色 -(void)changFatherColor{ self.superview.backgroundColor = [UIColor randomColor]; } //改变自身的位置 -(void)changSelfStation{ self.center = CGPointMake(arc4random()%((300-100+1)+100)*1.0, arc4random()%((500-100+1)+100)*1.0); } @end
#import <UIKit/UIKit.h> @interface PanView : UIView @end
View Code PanView.h
#import "PanView.h" @implementation PanView -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ //1.获取触摸屏幕的手指对象 UITouch * aTouch = [touches anyObject]; //2.获取手指所在点移动之前的位置和移动之后的位置 CGPoint currentLocation = [aTouch locationInView:self];//当前点位置，移动之后 CGPoint previousLocation = [aTouch previousLocationInView:self];//原来点位置，移动之前的点位置 //3.计算改变量 CGFloat dx = currentLocation.x - previousLocation.x; CGFloat dy = currentLocation.y - previousLocation.y; //4.移动之后视图所在的位置（中心点） self.center = CGPointMake(self.center.x + dx, self.center.y + dy); } @end
#import <UIKit/UIKit.h> @interface UIColor (Addition) //声明类方法的随机色 +(UIColor * )randomColor; @end
#import "UIColor+Addition.h" @implementation UIColor (Addition) +(UIColor * )randomColor{ // return [UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0]; return [self colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0]; } @end
#import <UIKit/UIKit.h>
@interface RootViewController : UIViewController
@end
// // RootViewController.m #import "RootViewController.h" #import "TouchView.h" #import "PanView.h" #import "PinchView.h" @interface RootViewController () @end @implementation RootViewController - (void)viewDidLoad { [super viewDidLoad]; //视图类都可以接触到触摸的事件 self.view.backgroundColor = [UIColor grayColor]; TouchView * redView = [[TouchView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; redView.backgroundColor = [UIColor redColor]; [self.view addSubview:redView]; [redView release]; PanView * yellowView = [[PanView alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; yellowView.backgroundColor = [UIColor yellowColor]; [self.view addSubview:yellowView]; [yellowView release]; PinchView * greenView = [[PinchView alloc]initWithFrame:CGRectMake(20, 50, 300, 400)]; greenView.backgroundColor = [UIColor greenColor]; [self.view addSubview:greenView]; [greenView release]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } /* #pragma mark - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller. } */ @end