.h文件
@property (weak,nonatomic) IBOutlet UILabel *messageLabel;
@property (weak,nonatomic) IBOutlet UILabel *tapsLabel;
@property (weak,nonatomic) IBOutlet UILabel *touchesLabel;
.m文件
-(void)updateLabelsFromTouches:(NSSet *)touches{
//numTaps 连续轻点屏幕多少次 numTouches指用户同时使用几个手指轻点屏幕一次
NSUInteger numTaps = [[touches anyObject]tapCount];
NSString *tapsMessage = [[NSString alloc]initWithFormat:@"%lu taps detected",(unsigned long)numTaps];
self.messageLabel.text = tapsMessage;
NSUInteger numTouches = [touches count];
NSString *touchMsg = [[NSString alloc]initWithFormat:@"%lu touches detected",(unsigned long)numTouches];
self.touchesLabel.text = touchMsg;
}
#pragma mark Touch Event Methods
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.messageLabel.text = @"Touches Began";
[self updateLabelsFromTouches:touches];
}
-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.messageLabel.text = @"Touches Cancelled";
[self updateLabelsFromTouches:touches];
}
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.messageLabel.text = @"Touches Ended";
[self updateLabelsFromTouches:touches];
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
self.messageLabel.text = @"Drag Detected";
[self updateLabelsFromTouches:touches];
}
使用touch触摸事件实现轻扫swipe手势的代码如下：
.h文件：
@property (weak,nonatomic) IBOutlet UILabel *swipeLabel;
@property(nonatomic)CGPoint gestureStartPoint;
.m文件：
#import "ViewController.h"
static CGFloat const kMinimumGestureLength = 25;
static CGFloat const kMaximumVariance = 5;
@interface ViewController ()
@end
@implementation ViewController{
BOOL animate;
}
-(void)eraseText{
self.swipeLabel.text = @"";
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
self.gestureStartPoint = [touch locationInView:self.view];
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//获取用户当前的位置
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];
CGFloat deltaX = fabs(self.gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabs(self.gestureStartPoint.y - currentPosition.y);
if (deltaX >= kMinimumGestureLength && deltaY<= kMaximumVariance) {
self.swipeLabel.text = @"Horizontal swipe detected";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}else if(deltaY>= kMinimumGestureLength && deltaX<= kMaximumVariance){
self.swipeLabel.text = @"Vertical swipe detected";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
}
@end
touches与ios的手势UIGestureRecognizer的区别就是：
一个是触摸事件；一个手势。UIGestureRecognizer就是对触摸事件的封装。
一、概述
iPhone中处理触摸屏的操作，在3.2之前是主要使用的是由UIResponder而来的如下4种方式：
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
但是这种方式甄别不同的手势操作实在是麻烦，需要你自己计算做不同的手势分辨.后来，苹果就给出了一个比较简便的方式，就是使用UIGestureRecognizer。
二、UIGestureRecognizer
UIGestureRecognizer基类是一个抽象类，我们主要是使用它的子类（名字包含链接，可以点击跳到ios Developer library，看官方文档）：
从名字上我们就能知道， Tap（点击）、Pinch（捏合）、Rotation（旋转）、Swipe（滑动，快速移动，是用于监测滑动的方向的）、Pan （拖移，慢速移动，是用于监测偏移的量的）以及 LongPress（长按）。
其核心就是设置delegate和在需要手势监测的view上使用addGestureRecognizer添加指定的手势监测。
当然要记得在作为delegate的view的头文件加上<UIGestureRecognizerDelegate>。
不过有些手势是关联的，怎么办呢？例如 Tap 与 LongPress、Swipe与 Pan，或是 Tap 一次与Tap 兩次。
手势识别是具有互斥的原则的，比如单击和双击，如果它识别出一种手势，其后的手势将不被识别。所以对于关联手势，要做特殊处理以帮助程序甄别，应该把当前手势归结到哪一类手势里面。
比如，单击和双击并存时，如果不做处理，它就只能发送出单击的消息。为了能够识别出双击手势，就需要做一个特殊处理逻辑，即先判断手势是否是双击，在双击失效的情况下作为单击手势处理。使用
[A requireGestureRecognizerToFail：B]函数，它可以指定当A手势发生时，即便A已经滿足条件了，也不会立刻触发，会等到指定的手势B确定失败之后才触发。
三、iphone操作手势的大概种类
1.点击(Tap)
点击作为最常用手势，用于按下或选择一个控件或条目（类似于普通的鼠标点击）、
2.拖动(Drag)
拖动用于实现一些页面的滚动，以及对控件的移动功能。
3.滑动(Flick)
滑动用于实现页面的快速滚动和翻页的功能。
4.横扫(Swipe)
横扫手势用于激活列表项的快捷操作菜单
5.双击(Double Tap)
双击放大并居中显示图片，或恢复原大小（如果当前已经放大）。同时，双击能够激活针对文字编辑菜单。
6.放大(Pinch open)
放大手势可以实现以下功能：打开订阅源，打开文章的详情。在照片查看的时候，放大手势也可实现放大图片的功能。
7.缩小(Pinch close)
缩小手势，可以实现与放大手势相反且对应的功能的功能：关闭订阅源退出到首页，关闭文章退出至索引页。在照片查看的时候，缩小手势也可实现缩小图片的功能。
8.长按(Touch &Hold)
在我的订阅页，长按订阅源将自动进入编辑模式，同时选中手指当前按下的订阅源。这时可直接拖动订阅源移动位置。
针对文字长按，将出现放大镜辅助功能。松开后，则出现编辑菜单。
针对图片长按，将出现编辑菜单。
9.摇晃(Shake)
摇晃手势，将出现撤销与重做菜单。主要是针对用户文本输入的。
使用UIGestureRescogize实现横扫(Swipe)手势的代码：
单指横扫：
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@property (weak,nonatomic) IBOutlet UILabel *swipeLabel;
@end
.m文件：
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController{
BOOL animate;
}
-(void)viewDidLoad{
[super viewDidLoad];
UISwipeGestureRecognizer *vertical = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(reportVerticalSwipe:)];
vertical.direction = UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:vertical];
UISwipeGestureRecognizer *horizontal = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(reportHorizaontalSwipe:)];
horizontal.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:horizontal];
}
-(void)eraseText{
self.swipeLabel.text = @"";
}
-(void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer{
self.swipeLabel.text = @"Vertical swipe detected";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
-(void)reportHorizaontalSwipe:(UIGestureRecognizer *)recognizer{
self.swipeLabel.text = @"Horizontal swipe detected";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
@end
多指横扫代码如下：.h文件一样，.m文件如下
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController{
BOOL animate;
}
-(void)viewDidLoad{
[super viewDidLoad];
for (NSUInteger touchConut = 1; touchConut <= 5; touchConut++) {
UISwipeGestureRecognizer *vertical;
vertical = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(reportVerticalSwipe:)];
vertical.direction = UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown;
vertical.numberOfTouchesRequired = touchConut;
[self.view addGestureRecognizer:vertical];
UISwipeGestureRecognizer *horizontal ;
horizontal = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(reportHorizaontalSwipe:)];
horizontal.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;
horizontal.numberOfTouchesRequired = touchConut;
[self.view addGestureRecognizer:horizontal];
}
}
-(void)eraseText{
self.swipeLabel.text = @"";
}
-(NSString *)descriptionForTouchCount:(NSUInteger)touchConut{
switch (touchConut) {
case 1:
return @"Single";
case 2:
return @"Double";
case 3:
return @"Triple";
case 4:
return @"Quadruple";
case 5:
return @"Quintuple";
default:
return @"";
}
}
-(void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer{
self.swipeLabel.text = [NSString stringWithFormat:@"%@Vertical swipe detected",[self descriptionForTouchCount:[recognizer numberOfTouches]]];
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
-(void)reportHorizaontalSwipe:(UIGestureRecognizer *)recognizer{
self.swipeLabel.text = [NSString stringWithFormat:@"%@Horizontal swipe detected",[self descriptionForTouchCount:[recognizer numberOfTouches]]];
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
@end
捏合和旋转的手势：
#import "ViewController.h"
@interface ViewController ()<UIGestureRecognizerDelegate>
@property (nonatomic,strong)UIImageView *imageView;
@end
@implementation ViewController{
CGFloat scale,previousScale;
CGFloat rotation,previousRotation;
}
-(void)viewDidLoad{
[super viewDidLoad];
previousScale = 1;
UIImage *image = [UIImage imageNamed:@"pic_客服头像@3x"];
self.imageView = [[UIImageView alloc]initWithImage:image];
self.imageView.userInteractionEnabled = YES;
self.imageView.center = self.view.center;
[self.view addSubview:self.imageView];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(doPinch:)];
pinchGesture.delegate = self;
[self.imageView addGestureRecognizer:pinchGesture];
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(doRote:)];
rotationGesture.delegate = self;
[self.imageView addGestureRecognizer:rotationGesture];
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
-(void)transformImageView{
CGAffineTransform t = CGAffineTransformMakeScale(scale * previousScale, scale *previousScale);
t = CGAffineTransformRotate(t, rotation + previousRotation);
self.imageView.transform = t;
}
-(void)doPinch:(UIPinchGestureRecognizer *)gesture{
scale = gesture.scale;
[self transformImageView];
if (gesture.state == UIGestureRecognizerStateEnded) {
previousScale = scale * previousScale;
scale = 1;
}
}
-(void)doRote:(UIRotationGestureRecognizer *)gesture{
rotation = gesture.rotation;
[self transformImageView];
if (gesture.state == UIGestureRecognizerStateEnded) {
previousRotation = rotation + previousRotation;
rotation = 0;
}
}
@end