IOS七种⼿势操作（拖动、捏合、旋转、点按、长按、轻扫、⾃定义）详解及实
例代码
IOS 七种⼿势操作
今天为⼤家介绍⼀下IOS 的七种⼿势，⼿势在开发中经常⽤到，所以就简单通俗易懂的说下，话不多说，直接看代码：
1、UIGestureRecognizer 介绍
⼿势识别在 iOS 中⾮常重要，他极⼤地提⾼了移动设备的使⽤便捷性。
iOS 系统在 3.2 以后，他提供了⼀些常⽤的⼿势（UIGestureRecognizer 的⼦类），开发者可以直接使⽤他们进⾏⼿势操作。
1. UIPanGestureRecognizer（拖动）
2. UIPinchGestureRecognizer（捏合）
3. UIRotationGestureRecognizer（旋转）
4. UITapGestureRecognizer（点按）
5. UILongPressGestureRecognizer（长按）
6. U ISwipeGestureRecognizer（轻扫）
另外，可以通过继承 UIGestureRecognizer 类，实现⾃定义⼿势（⼿势识别器类）。
PS：⾃定义⼿势时，需要 #import <UIKit/UIGestureRecognizerSubclass.h>，⼀般需实现如下⽅法：
- (void)reset;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;
//以上⽅法在分类 UIGestureRecognizer (UIGestureRecognizerProtected) 中声明，更多⽅法声明请⾃⾏查看
UIGestureRecognizer 的继承关系如下：
2、⼿势状态
在六种⼿势识别中，只有⼀种⼿势是离散型⼿势，他就是 UITapGestureRecognizer。
离散型⼿势的特点就是：⼀旦识别就⽆法取消，⽽且只会调⽤⼀次⼿势操作事件（初始化⼿势时指定的回调⽅法）。
换句话说其他五种⼿势是连续型⼿势，⽽连续型⼿势的特点就是：会多次调⽤⼿势操作事件，⽽且在连续⼿势识别后可以取消⼿势。从下图可以看出两者调⽤操作事件的次数是不同的：
⼿势状态枚举如下：
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
};
对于离散型⼿势 UITapGestureRecgnizer 要么被识别，要么失败，点按（假设点按次数设置为1，并且没有添加长按⼿势）下去⼀次不松开则此时什么也不会发⽣，松开⼿指⽴即识别并调⽤操作事件，并且状态为3（已完成）。
但是连续型⼿势要复杂⼀些，就拿旋转⼿势来说，如果两个⼿指点下去不做任何操作，此时并不能识别⼿势（因为我们还没旋转）但是其实已经触发了触摸开始事件，此时处于状态0；如果此时旋转会被识别，也就会调⽤对应的操作事件，同时状态变成1（⼿势开始），但是状态1只有⼀瞬间；紧接着状态变
为2（因为我们的旋转需要持续⼀会），并且重复调⽤操作事件（如果在事件中打印状态会重复打印2）；松开⼿指，此时状态变为3，并调⽤1次操作事件。
3、使⽤⼿势的步骤
使⽤⼿势很简单，分为三步：
1. 创建⼿势识别器对象实例。创建时，指定⼀个回调⽅法，当⼿势开始，改变、或结束时，执⾏回调⽅法。
2. 设置⼿势识别器对象实例的相关属性（可选部分）
3. 添加到需要识别的 View 中。每个⼿势只对应⼀个 View，当屏幕触摸在 View 的边界内时，如果⼿势和预定的⼀样，那就会执⾏回调⽅法。
PS：⼀个⼿势只能对应⼀个 View，但是⼀个 View 可以有多个⼿势。建议在真机上测试这些⼿势，模拟器操作不太⽅便，可能导致认为⼿势失效的情况。（模拟器测试捏合和旋转⼿势时，按住 option 键，再⽤触摸板或⿏标操作）
4、举例说明
功能描述：
附加到两个图⽚视图 UIImageView 的有『拖动』、『捏合』、『旋转』、『点按』；
⽽『轻扫』和『⾃定义⼿势 KMGestureRecognizer』附加在根视图 UIView 中。
拖动：进⾏当前图⽚视图位置移动
捏合：进⾏当前图⽚视图缩放
旋转：进⾏当前图⽚视图⾓度旋转
点按：双击恢复当前图⽚视图的缩放、⾓度旋转、不透明度
长按：设置当前图⽚视图的不透明度为0.7
轻扫：左右轻扫设置两个图⽚视图为居中，同时以垂直居中的特定偏移量定位
⾃定义⼿势：挠痒功能，左右扫动共3次或以上，设置两个图⽚视图为居中，同时以⽔平居中的特定偏移量定位效果如下：
KMGestureRecognizer.h
#import <UIKit/UIKit.h>
typedef NS_ENUM(NSUInteger, Direction) {
DirectionUnknown,
DirectionLeft,
DirectionRight
};
@interface KMGestureRecognizer : UIGestureRecognizer
@property (assign, nonatomic) NSUInteger tickleCount; //挠痒次数
@property (assign, nonatomic) CGPoint currentTickleStart; //当前挠痒开始坐标位置
@property (assign, nonatomic) Direction lastDirection; //最后⼀次挠痒⽅向
@end
KMGestureRecognizer.m
#import "KMGestureRecognizer.h"
#import <UIKit/UIGestureRecognizerSubclass.h>
@implementation KMGestureRecognizer
#define kMinTickleSpacing 20.0
#define kMaxTickleCount 3
- (void)reset {
_tickleCount = 0;
_currentTickleStart = CGPointZero;
_lastDirection = DirectionUnknown;
if (self.state == UIGestureRecognizerStatePossible) {
self.state = UIGestureRecognizerStateFailed;
}
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
_currentTickleStart = [touch locationInView:self.view]; //设置当前挠痒开始坐标位置
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
//『当前挠痒开始坐标位置』和『移动后坐标位置』进⾏ X 轴值⽐较，得到是向左还是向右移动
UITouch *touch = [touches anyObject];
CGPoint tickleEnd = [touch locationInView:self.view];
CGFloat tickleSpacing = tickleEnd.x - _currentTickleStart.x;
Direction currentDirection = tickleSpacing < 0 ? DirectionLeft : DirectionRight;
//移动的 X 轴间距值是否符合要求，⾜够⼤
if (ABS(tickleSpacing) >= kMinTickleSpacing) {
//判断是否有三次不同⽅向的动作，如果有则⼿势结束，将执⾏回调⽅法
if (_lastDirection == DirectionUnknown ||
(_lastDirection == DirectionLeft && currentDirection == DirectionRight) ||
(_lastDirection == DirectionRight && currentDirection == DirectionLeft)) {
_tickleCount++;
_currentTickleStart = tickleEnd;
_lastDirection = currentDirection;
if (_tickleCount >= kMaxTickleCount && self.state == UIGestureRecognizerStatePossible) {
self.state = UIGestureRecognizerStateEnded;
//NSLog(@"⾃定义⼿势成功，将执⾏回调⽅法");
}
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self reset];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
[self reset];
}
@end
ViewController.h
#import <UIKit/UIKit.h>
#import "KMGestureRecognizer.h"
@interface ViewController : UIViewController
@property (strong, nonatomic) UIImageView *imgV;
@property (strong, nonatomic) UIImageView *imgV2;
@property (strong, nonatomic) KMGestureRecognizer *customGestureRecognizer;
@end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
- (void)handlePan:(UIPanGestureRecognizer *)recognizer;
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer;
- (void)handleRotation:(UIRotationGestureRecognizer *)recognizer;
- (void)handleTap:(UITapGestureRecognizer *)recognizer;
- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer;
- (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer;
- (void)handleCustomGestureRecognizer:(KMGestureRecognizer *)recognizer;
- (void)bindPan:(UIImageView *)imgVCustom;
-
(void)bindPinch:(UIImageView *)imgVCustom;
- (void)bindRotation:(UIImageView *)imgVCustom;
- (void)bindTap:(UIImageView *)imgVCustom;
- (void)bindLongPress:(UIImageView *)imgVCustom;
- (void)bindSwipe;
- (void)bingCustomGestureRecognizer;
- (void)layoutUI;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self layoutUI];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - 处理⼿势操作
/**
* 处理拖动⼿势
*
* @param recognizer 拖动⼿势识别器对象实例
*/
- (void)handlePan:(UIPanGestureRecognizer *)recognizer {
//视图前置操作
[recognizer.view.superview bringSubviewToFront:recognizer.view];
CGPoint center = ;
CGFloat cornerRadius = recognizer.view.frame.size.width / 2;
CGPoint translation = [recognizer translationInView:self.view];
//NSLog(@"%@", NSStringFromCGPoint(translation));
= CGPointMake(center.x + translation.x, center.y + translation.y);
[recognizer setTranslation:CGPointZero inView:self.view];
if (recognizer.state == UIGestureRecognizerStateEnded) {
/
/计算速度向量的长度，当他⼩于200时，滑⾏会很短
CGPoint velocity = [recognizer velocityInView:self.view];
CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
CGFloat slideMult = magnitude / 200;
//NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); //e.g. 397.973175, slideMult: 1.989866
//基于速度和速度因素计算⼀个终点
float slideFactor = 0.1 * slideMult;
CGPoint finalPoint = CGPointMake(center.x + (velocity.x * slideFactor),
center.y + (velocity.y * slideFactor));
//限制最⼩［cornerRadius］和最⼤边界值［self.view.bounds.size.width - cornerRadius］，以免拖动出屏幕界限
finalPoint.x = MIN(MAX(finalPoint.x, cornerRadius),
self.view.bounds.size.width - cornerRadius);
finalPoint.y = MIN(MAX(finalPoint.y, cornerRadius),
self.view.bounds.size.height - cornerRadius);
//使⽤ UIView 动画使 view 滑⾏到终点
[UIView animateWithDuration:slideFactor*2
delay:0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
= finalPoint;
}
completion:nil];
}
}
/**
* 处理捏合⼿势
*
* @param recognizer 捏合⼿势识别器对象实例
*/
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer {
CGFloat scale = recognizer.scale;
ansform = CGAffineTransformScale(ansform, scale, scale); //在已缩
放⼤⼩基础下进⾏累加变化；区别于：使⽤ CGAffineTransformMakeScale ⽅法就是在原⼤⼩基础下进⾏变化  recognizer.scale = 1.0;
}
/**
* 处理旋转⼿势
*
* @param recognizer 旋转⼿势识别器对象实例
*/
- (void)handleRotation:(UIRotationGestureRecognizer *)recognizer {
ansform = CGAffineTransformRotate(ansform, ation);
}
/**
* 处理点按⼿势
*
* @param recognizer 点按⼿势识别器对象实例
*/
- (void)handleTap:(UITapGestureRecognizer *)recognizer {
UIView *view = recognizer.view;
view.alpha = 1.0;
}
/
**
* 处理长按⼿势
*
* @param recognizer 点按⼿势识别器对象实例
*/
- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer {
//长按的时候，设置不透明度为0.7
recognizer.view.alpha = 0.7;
}
/**
* 处理轻扫⼿势
*
* @param recognizer 轻扫⼿势识别器对象实例
*/
- (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer {
//代码块⽅式封装操作⽅法
void (^positionOperation)() = ^() {
CGPoint newPoint = ;
newPoint.y -= 20.0;
_ = newPoint;
newPoint.y += 40.0;
_ = newPoint;
};
//根据轻扫⽅向，进⾏不同控制
switch (recognizer.direction) {
case UISwipeGestureRecognizerDirectionRight: {
positionOperation();
break;
}
case UISwipeGestureRecognizerDirectionLeft: {
positionOperation();
break;
}
case UISwipeGestureRecognizerDirectionUp: {
break;
}
case UISwipeGestureRecognizerDirectionDown: {
break;
}
}
}
/**
* 处理⾃定义⼿势
*
* @param recognizer ⾃定义⼿势识别器对象实例
*/
- (void)handleCustomGestureRecognizer:(KMGestureRecognizer *)recognizer {
//代码块⽅式封装操作⽅法
void (^positionOperation)() = ^() {
CGPoint newPoint = ;
newPoint.x -= 20.0;
_ = newPoint;
newPoint.x += 40.0;
_ = newPoint;
};
positionOperation();
}
#pragma mark - 绑定⼿势操作
/**
* 绑定拖动⼿势
*
* @param imgVCustom 绑定到图⽚视图对象实例
*/
- (void)bindPan:(UIImageView *)imgVCustom {
UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
action:@selector(handlePan:)];
[imgVCustom addGestureRecognizer:recognizer];
}
/**
* 绑定捏合⼿势
*
* @param imgVCustom 绑定到图⽚视图对象实例
*/
- (void)bindPinch:(UIImageView *)imgVCustom {
UIPinchGestureRecognizer *recognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self
action:@selector(handlePinch:)];
[imgVCustom addGestureRecognizer:recognizer];
/
/[recognizer stureRecognizers.firstObject];
}
/**
* 绑定旋转⼿势
*
* @param imgVCustom 绑定到图⽚视图对象实例
*/
- (void)bindRotation:(UIImageView *)imgVCustom {
UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self                                              action:@selector(handleRotation:)];
[imgVCustom addGestureRecognizer:recognizer];
}
/**
* 绑定点按⼿势
*
* @param imgVCustom 绑定到图⽚视图对象实例
*/
- (void)bindTap:(UIImageView *)imgVCustom {
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleTap:)];
//使⽤⼀根⼿指双击时，才触发点按⼿势识别器
recognizer.numberOfTapsRequired = 2;
recognizer.numberOfTouchesRequired = 1;
[imgVCustom addGestureRecognizer:recognizer];
}
/**
* 绑定长按⼿势
*
* @param imgVCustom 绑定到图⽚视图对象实例
*/
- (void)bindLongPress:(UIImageView *)imgVCustom {
UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];  recognizer.minimumPressDuration = 0.5; //设置最⼩长按时间；默认为0.5秒
[imgVCustom addGestureRecognizer:recognizer];
}
/**
* 绑定轻扫⼿势；⽀持四个⽅向的轻扫，但是不同的⽅向要分别定义轻扫⼿势
*/
- (void)bindSwipe {
//向右轻扫⼿势
UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSwipe:)];
recognizer.direction = UISwipeGestureRecognizerDirectionRight; //设置轻扫⽅向；默认是 UISwipeGestureRecognizerDirectionRight，即向右轻扫  [self.view addGestureRecognizer:recognizer];
[recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //设置以⾃定义挠痒⼿势优先识别
//向左轻扫⼿势
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSwipe:)];
recognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:recognizer];
[recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //设置以⾃定义挠痒⼿势优先识别
}
/**
* 绑定⾃定义挠痒⼿势；判断是否有三次不同⽅向的动作，如果有则⼿势结束，将执⾏回调⽅法
*/
- (void)bingCustomGestureRecognizer {
//当 recognizer.state 为 UIGestureRecognizerStateEnded 时，才执⾏回调⽅法 handleCustomGestureRecognizer:
//_customGestureRecognizer = [KMGestureRecognizer new];
_customGestureRecognizer = [[KMGestureRecognizer alloc] initWithTarget:self
action:@selector(handleCustomGestureRecognizer:)];
[self.view addGestureRecognizer:_customGestureRecognizer];
}
- (void)layoutUI {
//图⽚视图 _imgV
tickleUIImage *img = [UIImage imageNamed:@"Emoticon_tusiji_icon"];
CGFloat cornerRadius = img.size.width;
_imgV = [[UIImageView alloc] initWithImage:img];
_imgV.frame = CGRectMake(20.0, 20.0,
cornerRadius * 2, cornerRadius * 2);
_imgV.userInteractionEnabled = YES;
_imgV.layer.masksToBounds = YES;
_Radius = cornerRadius;
_imgV.layer.borderWidth = 2.0;
_imgV.layer.borderColor = [UIColor grayColor].CGColor;
[self.view addSubview:_imgV];
//图⽚视图 _imgV2
img = [UIImage imageNamed:@"Emoticon_tusiji_icon2"];
cornerRadius = img.size.width;
_imgV2 = [[UIImageView alloc] initWithImage:img];
_imgV2.frame = CGRectMake(20.0, 40.0 + _imgV.frame.size.height,
cornerRadius * 2, cornerRadius * 2);
_imgV2.userInteractionEnabled = YES;
_imgV2.layer.masksToBounds = YES;
_Radius = cornerRadius;
_imgV2.layer.borderWidth = 2.0;
_imgV2.layer.borderColor = [UIColor orangeColor].CGColor;
[self.view addSubview:_imgV2];
[self bindPan:_imgV];
[self bindPinch:_imgV];
[self bindRotation:_imgV];
[self bindTap:_imgV];
[self bindLongPress:_imgV];
[self bindPan:_imgV2];
[self bindPinch:_imgV2];
[self bindRotation:_imgV2];
[self bindTap:_imgV2];
[self bindLongPress:_imgV2];
//为了处理⼿势识别优先级的问题，这⾥需先绑定⾃定义挠痒⼿势
[self bingCustomGestureRecognizer];
[self bindSwipe];
}
@end
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