标签:ios ios开发 手势识别 手势触摸
iOS的输入事件
触摸事件
手势识别
手机摇晃
一、iOS的输入事件
触摸事件(滑动、点击)
运动事件(摇一摇、手机倾斜、行走),不需要人为参与的
远程控制事件(耳机控制手机声音)
1??iOS事件对象都是UIEvent类的实例
UIEvent类对事件类型定义了enum常量:
typedef NS_ENUM(NSInteger, UIEventType){
UIEventTypeTouches,
UIEventTypeMotion,
UIEventRemoteControl,
};
触摸事件必须是继承UIResponser的
二、触摸事件
1??UIView,有4种处理不同的触摸事件
UIView是UIResponder的子类,可以覆盖下列4个方法处理不同的触摸事件。
1. 一根或者多根手指开始触摸屏幕
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
2.一根或者多根手指在屏幕上移动(随着手指的移动,会持续调用该方法)
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
3.一根或者多根手指离开屏幕
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
4.触摸结束前,某个
系统事件(例如电话呼入)会打断触摸过程
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
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#pragma mark - UITouch事件
#pragma mark 触摸开始
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"触摸开始");
for (UITouch *touch in touches) {
NSLog(@"%@", touch);
}
}
#pragma mark 触摸移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"触摸移动Touch对象个数:%d",[touches count]);
// 要移动界面上黄颜色的视图
// 1. 得到当前手指的位置
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self.view];
// 2. 得到上一次手指的位置
CGPoint preLocation = [touch previousLocationInView:self.view];
// 3. 计算两个位置之间的偏移
CGPoint offset = CGPointMake(location.x - preLocation.x, location.y - preLocation.y);
// 4. 使用计算出来的偏移量,调整视图的位置
[_demoView setCenter:CGPointMake(_demoView.center.x + offset.x, _demoView.center.y + offset.y)];
// 完整的UITouch事件调试方法
NSLog(@"触摸移动");
for (UITouch *touch in touches) {
NSLog(@"%@", touch);
}
}
#pragma mark 触摸结束
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// 完整的UITouch事件调试方法
NSLog(@"触摸完成");
for (UITouch *touch in touches) {
NSLog(@"%@", touch);
}
}
#pragma mark 触摸中断
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
// 完整的UITouch事件调试方法
NSLog(@"触摸中断");
for (UITouch *touch in touches) {
NSLog(@"%@", touch);
}
}
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2??触摸事件的处理
如果hit-test视图无法处理事件,则通过响应者链向上传递
1.如果hit-test视图的控制器存在,就传递给控制器;如果控制器不存在,则将其传递给它的父视图
2.如果视图或它的控制器无法处理收到的事件或消息,则将其传递给该视图的父视图
3.每一个在视图继承树中的上层视图如果不能处理收到的事件或消息,则重复上面的步骤1,2
4.在视图继承树的最上层视图,如果也不能处理收到的事件或消息,则其将事件或消息传递给窗口对象进行处理
5. 如果窗口对象也不能进行处理,则其将事件或消息传递给UIApplication对象
6.如果UIApplication也不能处理该事件或消息,则将其丢弃
当用户点击屏幕时,会产生一个UITouch对象传递给UIApplication,然后由window负责查找最适合相应触摸事件的视图对象(hitTest,pointInside)
找到合适的视图之后,Touch方法由对应的视图完成,上级视图不再接管
3??不接受处理事件的三种方法
不接收用户交互:userInteractionEnabled = NO;
隐藏:hidden = YES;
透明:alpha = 0~0.01
三、手势识别
1??iOS目前支持的手势识别(6种)
UITapGestureRecognizer(点按)
UIPinchGestureRecognizer(捏合)
UIPanGestureRecognizer(拖动)
UISwipeGestureRecognizer(轻扫)
UIRotationGestureRecognizer(旋转)
UILongPressGestureRecognizer(长按)
2??手势识别的使用方法(4步)
通常在视图加载的时候定义(UIGestureRecognizer是抽象类,需要实例化使用)
创建手势识别实例
设置手势识别属性,例如手指数量,方向等
将手势识别附加到指定的视图之上
编写手势触发响应方法
3??手势识别的状态(7个)
1. // 没有触摸事件发生,所有手势识别的默认状态
UIGestureRecognizerStatePossible,
// 一个手势已经开始但尚未改变或者完成时
UIGestureRecognizerStateBegan,
// 手势状态改变
UIGestureRecognizerStateChanged,
// 手势完成
UIGestureRecognizerStateEnded,
// 手势取消,恢复至Possible状态
UIGestureRecognizerStateCancelled,
// 手势失败,恢复至Possible状态
UIGestureRecognizerStateFailed,
// 识别到手势识别
UIGestureRecognizerStateRecognized =UIGestureRecognizerStateEnded
2.手势识别的属性
state——手势状态
view——手势发生视图
常用方法
locationInView 获得手势发生对应视图所在位置
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- (void)viewDidLoad
{
[super viewDidLoad];
// 根据实例化方法,我们知道:
// 1.有一个处理消息的对象,应该是self
// 2.我们需要定义一个方法,当手势识别检测到的时候,运行
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
// setNumberOfTapsRequired 点按次数
[tap setNumberOfTapsRequired:1];
// setNumberOfTouchesRequired 点按的手指数量
[tap setNumberOfTouchesRequired:1];
// 把手势识别增加到视图上
[self.demoView addGestureRecognizer:tap];
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchAction:)];
[self.demoView addGestureRecognizer:pinch];
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationAction:)];
[self.demoView addGestureRecognizer:rotation];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
[self.demoView addGestureRecognizer:pan];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
[self.demoView addGestureRecognizer:longPress];
// 向左扫
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[self.view addGestureRecognizer:swipeLeft];
// 向右扫
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
[self.view addGestureRecognizer:swipeRight];
// 向上扫
UISwipeGestureRecognizer *swipeTop = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
[swipeTop setDirection:UISwipeGestureRecognizerDirectionUp];
[self.view addGestureRecognizer:swipeTop];
// 向下扫
UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
[swipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
[self.view addGestureRecognizer:swipeDown];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - 轻扫手势
- (void)swipeAction:(UISwipeGestureRecognizer *)sender
{
NSLog(@"%d", sender.direction);
switch (sender.direction) {
case UISwipeGestureRecognizerDirectionLeft:
NSLog(@"向左扫");
break;
case UISwipeGestureRecognizerDirectionRight:
NSLog(@"向右扫");
break;
case UISwipeGestureRecognizerDirectionUp:
NSLog(@"向上扫");
break;
case UISwipeGestureRecognizerDirectionDown:
NSLog(@"向下扫");
break;
default:
break;
}
}
#pragma mark - 长按手势
- (void)longPressAction:(UILongPressGestureRecognizer *)sender
{
// 我们可以利用demoView的Tag属性,默认时tag=0
// 如果tag=0,我们放大一倍,否则,我们缩小一半
CGFloat scale;
if (_demoView.tag == 0) {
scale = 2.0;
_demoView.tag = 1;
} else {
scale = 0.5;
_demoView.tag = 0;
}
sender.view.transform = CGAffineTransformScale(sender.view.transform, scale, scale);
}
#pragma mark - 拖放手势
- (void)panAction:(UIPanGestureRecognizer *)sender
{
// 在拖放手势中是需要考虑手指的状态的UIGestureRecognizerState
// 在拖放手势中使用的状态是UIGestureRecognizerStateChanged
// 通常在使用拖放手势的时候,当手指离开的时候,应该做一个很小的动作,提醒用户拖放完成
if (sender.state == UIGestureRecognizerStateChanged) {
// locationInView
[_demoView setCenter:[sender locationInView:self.view]];
} else if (sender.state == UIGestureRecognizerStateEnded) {
[_demoView setBackgroundColor:[UIColor yellowColor]];
}
}
#pragma mark - 旋转手势
- (void)rotationAction:(UIRotationGestureRecognizer *)sender
{
sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);
// 和捏合操作类似,旋转角度同样需要方福伟
sender.rotation = 0.0f;
}
#pragma mark - 捏合手势
- (void)pinchAction:(UIPinchGestureRecognizer *)sender
{
// 有关转换的内容,我们在后续动画部分再继续
sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.scale, sender.scale);
// 缩放功能很简单,但是不要忘记将比例复位
sender.scale = 1.0f;
NSLog(@"捏我了");
}
#pragma mark - 点按手势
- (void)tapAction:(UITapGestureRecognizer *)sender
{
NSLog(@"点我了 %@", sender);
}
#pragma mark - 手势触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"触摸事件!");
// 1. 先取出UITouch对象
// 2. 判断响应点击的UIView是不是我们需要的
UITouch *touch = [touches anyObject];
if ([touch view] == _imageView) {
NSLog(@"点到图像了!");
}
}
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四、手机摇晃
1. 新建摇晃监听视图ShakeListenerView,并且设置canBecomeFirstResponder返回YES
- (BOOL)canBecomeFirstResponder
{
return YES;
}
2. 在Storyboard中将ViewController的View的Class设置为:ShakeListenerView
3. 在ViewController.m文件中增加:viewDidAppear和viewDidDisappear在视图出现和消失时成为/撤销第一响应者身份
4. 在视图控制器中增加手势监听方法:
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (event.subtype == UIEventSubtypeMotionShake) {
NSLog(@"shake phone");
}
}
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#pragma mark - 要让ViewController支持摇晃,需要写三个方法
// 1. 成为第一响应者,视图一出现时,就应该成为第一响应者
- (void)viewDidAppear:(BOOL)animated
{
[self.view becomeFirstResponder];
// 不要忘记去实现父类方法
[super viewDidAppear:animated];
}
// 2. 注销第一响应者,视图要关闭的时候,注销
- (void)viewDidDisappear:(BOOL)animated
{
[self.view resignFirstResponder];
// 不要忘记去实现父类方法
[super viewDidDisappear:animated];
}
// 3. 监听并处理移动事件,判断是否摇晃了手机
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake) {
NSLog(@"摇啊摇,摇到外婆桥!!!");
}
}
iOS开发学习之触摸事件和手势识别(转
标签:ios ios开发 手势识别 手势触摸
原文地址:http://blog.csdn.net/yangchen9931/article/details/45502577