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IOS 七種手勢操作(拖動、捏合、旋轉(zhuǎn)、點按、長按、輕掃、自定義)詳解及實例代碼

 更新時間:2016年12月12日 15:36:42   投稿:lqh  
這篇文章主要介紹了IOS 七種手勢操作(拖動、捏合、旋轉(zhuǎn)、點按、長按、輕掃、自定義)詳解及實例代碼的相關(guān)資料,需要的朋友可以參考下

IOS 七種手勢操作

今天為大家介紹一下IOS 的七種手勢,手勢在開發(fā)中經(jīng)常用到,所以就簡單 通俗易懂的說下, 話不多說,直接看代碼:

1、UIGestureRecognizer 介紹

手勢識別在 iOS 中非常重要,他極大地提高了移動設(shè)備的使用便捷性。

iOS 系統(tǒng)在 3.2 以后,他提供了一些常用的手勢(UIGestureRecognizer 的子類),開發(fā)者可以直接使用他們進行手勢操作。

  1. UIPanGestureRecognizer(拖動)
  2. UIPinchGestureRecognizer(捏合)
  3. UIRotationGestureRecognizer(旋轉(zhuǎn))
  4. UITapGestureRecognizer(點按)
  5. UILongPressGestureRecognizer(長按)
  6. ​UISwipeGestureRecognizer(輕掃)

另外,可以通過繼承 UIGestureRecognizer 類,實現(xiàn)自定義手勢(手勢識別器類)。

PS:自定義手勢時,需要 #import <UIKit/UIGestureRecognizerSubclass.h>,一般需實現(xiàn)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;
//以上方法在分類 UIGestureRecognizer (UIGestureRecognizerProtected) 中聲明,更多方法聲明請自行查看

UIGestureRecognizer 的繼承關(guān)系如下:

 2、手勢狀態(tài)

在六種手勢識別中,只有一種手勢是離散型手勢,他就是 UITapGestureRecognizer。

離散型手勢的特點就是:一旦識別就無法取消,而且只會調(diào)用一次手勢操作事件(初始化手勢時指定的回調(diào)方法)。

​換句話說其他五種手勢是連續(xù)型手勢,而連續(xù)型手勢的特點就是:會多次調(diào)用手勢操作事件,而且在連續(xù)手勢識別后可以取消手勢。從下圖可以看出兩者調(diào)用操作事件的次數(shù)是不同的:

手勢狀態(tài)枚舉如下:

typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
  UIGestureRecognizerStatePossible,  // 尚未識別是何種手勢操作(但可能已經(jīng)觸發(fā)了觸摸事件),默認狀態(tài)
  UIGestureRecognizerStateBegan,   // 手勢已經(jīng)開始,此時已經(jīng)被識別,但是這個過程中可能發(fā)生變化,手勢操作尚未完成
  UIGestureRecognizerStateChanged,  // 手勢狀態(tài)發(fā)生轉(zhuǎn)變
  UIGestureRecognizerStateEnded,   // 手勢識別操作完成(此時已經(jīng)松開手指)
  UIGestureRecognizerStateCancelled, // 手勢被取消,恢復(fù)到默認狀態(tài)
  UIGestureRecognizerStateFailed,   // 手勢識別失敗,恢復(fù)到默認狀態(tài)
  UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded // 手勢識別完成,同UIGestureRecognizerStateEnded
};

對于離散型手勢 UITapGestureRecgnizer 要么被識別,要么失敗,點按(假設(shè)點按次數(shù)設(shè)置為1,并且沒有添加長按手勢)下去一次不松開則此時什么也不會發(fā)生,松開手指立即識別并調(diào)用操作事件,并且狀態(tài)為3(已完成)。

但是連續(xù)型手勢要復(fù)雜一些,就拿旋轉(zhuǎn)手勢來說,如果兩個手指點下去不做任何操作,此時并不能識別手勢(因為我們還沒旋轉(zhuǎn))但是其實已經(jīng)觸發(fā)了觸摸開始事件,此時處于狀態(tài)0;如果此時旋轉(zhuǎn)會被識別,也就會調(diào)用對應(yīng)的操作事件,同時狀態(tài)變成1(手勢開始),但是狀態(tài)1只有一瞬間;緊接著狀態(tài)變?yōu)?(因為我們的旋轉(zhuǎn)需要持續(xù)一會),并且重復(fù)調(diào)用操作事件(如果在事件中打印狀態(tài)會重復(fù)打印2);松開手指,此時狀態(tài)變?yōu)?,并調(diào)用1次操作事件。

3、使用手勢的步驟

使用手勢很簡單,分為三步:

  1. 創(chuàng)建手勢識別器對象實例。創(chuàng)建時,指定一個回調(diào)方法,當(dāng)手勢開始,改變、或結(jié)束時,執(zhí)行回調(diào)方法。
  2. 設(shè)置手勢識別器對象實例的相關(guān)屬性(可選部分)
  3. 添加到需要識別的 View 中。每個手勢只對應(yīng)一個 View,當(dāng)屏幕觸摸在 View 的邊界內(nèi)時,如果手勢和預(yù)定的一樣,那就會執(zhí)行回調(diào)方法。

PS:一個手勢只能對應(yīng)一個 View,但是一個 View 可以有多個手勢。建議在真機上測試這些手勢,模擬器操作不太方便,可能導(dǎo)致認為手勢失效的情況。(模擬器測試捏合和旋轉(zhuǎn)手勢時,按住 option 鍵,再用觸摸板或鼠標(biāo)操作)

4、舉例說明

功能描述:

附加到兩個圖片視圖 UIImageView 的有『拖動』、『捏合』、『旋轉(zhuǎn)』、『點按』;

而『輕掃』和『自定義手勢 KMGestureRecognizer』附加在根視圖 UIView 中。

拖動:進行當(dāng)前圖片視圖位置移動

捏合:進行當(dāng)前圖片視圖縮放

旋轉(zhuǎn):進行當(dāng)前圖片視圖角度旋轉(zhuǎn)

點按:雙擊恢復(fù)當(dāng)前圖片視圖的縮放、角度旋轉(zhuǎn)、不透明度

長按:設(shè)置當(dāng)前圖片視圖的不透明度為0.7

輕掃:左右輕掃設(shè)置兩個圖片視圖為居中,同時以垂直居中的特定偏移量定位

自定義手勢:撓癢功能,左右掃動共3次或以上,設(shè)置兩個圖片視圖為居中,同時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; //撓癢次數(shù)
@property (assign, nonatomic) CGPoint currentTickleStart; //當(dāng)前撓癢開始坐標(biāo)位置
@property (assign, nonatomic) Direction lastDirection; //最后一次撓癢方向

@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]; //設(shè)置當(dāng)前撓癢開始坐標(biāo)位置
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  //『當(dāng)前撓癢開始坐標(biāo)位置』和『移動后坐標(biāo)位置』進行 X 軸值比較,得到是向左還是向右移動
  UITouch *touch = [touches anyObject];
  CGPoint tickleEnd = [touch locationInView:self.view];
  CGFloat tickleSpacing = tickleEnd.x - _currentTickleStart.x;
  Direction currentDirection = tickleSpacing < 0 ? DirectionLeft : DirectionRight;
  
  //移動的 X 軸間距值是否符合要求,足夠大
  if (ABS(tickleSpacing) >= kMinTickleSpacing) {
    //判斷是否有三次不同方向的動作,如果有則手勢結(jié)束,將執(zhí)行回調(diào)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(@"自定義手勢成功,將執(zhí)行回調(diào)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 - 處理手勢操作
/**
 * 處理拖動手勢
 *
 * @param recognizer 拖動手勢識別器對象實例
 */
- (void)handlePan:(UIPanGestureRecognizer *)recognizer {
  //視圖前置操作
  [recognizer.view.superview bringSubviewToFront:recognizer.view];
  
  CGPoint center = recognizer.view.center;
  CGFloat cornerRadius = recognizer.view.frame.size.width / 2;
  CGPoint translation = [recognizer translationInView:self.view];
  //NSLog(@"%@", NSStringFromCGPoint(translation));
  recognizer.view.center = CGPointMake(center.x + translation.x, center.y + translation.y);
  [recognizer setTranslation:CGPointZero inView:self.view];
  
  if (recognizer.state == UIGestureRecognizerStateEnded) {
    //計算速度向量的長度,當(dāng)他小于200時,滑行會很短
    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計算一個終點
    float slideFactor = 0.1 * slideMult;
    CGPoint finalPoint = CGPointMake(center.x + (velocity.x * slideFactor),
                     center.y + (velocity.y * slideFactor));
    //限制最?。踓ornerRadius]和最大邊界值[self.view.bounds.size.width - cornerRadius],以免拖動出屏幕界限
    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 動畫使 view 滑行到終點
    [UIView animateWithDuration:slideFactor*2
               delay:0
              options:UIViewAnimationOptionCurveEaseOut
             animations:^{
               recognizer.view.center = finalPoint;
             }
             completion:nil];
  }
}

/**
 * 處理捏合手勢
 *
 * @param recognizer 捏合手勢識別器對象實例
 */
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer {
  CGFloat scale = recognizer.scale;
  recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, scale, scale); //在已縮放大小基礎(chǔ)下進行累加變化;區(qū)別于:使用 CGAffineTransformMakeScale 方法就是在原大小基礎(chǔ)下進行變化
  recognizer.scale = 1.0;
}

/**
 * 處理旋轉(zhuǎn)手勢
 *
 * @param recognizer 旋轉(zhuǎn)手勢識別器對象實例
 */
- (void)handleRotation:(UIRotationGestureRecognizer *)recognizer {
  recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
  recognizer.rotation = 0.0;
}

/**
 * 處理點按手勢
 *
 * @param recognizer 點按手勢識別器對象實例
 */
- (void)handleTap:(UITapGestureRecognizer *)recognizer {
  UIView *view = recognizer.view;
  view.transform = CGAffineTransformMakeScale(1.0, 1.0);
  view.transform = CGAffineTransformMakeRotation(0.0);
  view.alpha = 1.0;
}

/**
 * 處理長按手勢
 *
 * @param recognizer 點按手勢識別器對象實例
 */
- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer {
  //長按的時候,設(shè)置不透明度為0.7
  recognizer.view.alpha = 0.7;
}

/**
 * 處理輕掃手勢
 *
 * @param recognizer 輕掃手勢識別器對象實例
 */
- (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer {
  //代碼塊方式封裝操作方法
  void (^positionOperation)() = ^() {
    CGPoint newPoint = recognizer.view.center;
    newPoint.y -= 20.0;
    _imgV.center = newPoint;
    
    newPoint.y += 40.0;
    _imgV2.center = newPoint;
  };
  
  //根據(jù)輕掃方向,進行不同控制
  switch (recognizer.direction) {
    case UISwipeGestureRecognizerDirectionRight: {
      positionOperation();
      break;
    }
    case UISwipeGestureRecognizerDirectionLeft: {
      positionOperation();
      break;
    }
    case UISwipeGestureRecognizerDirectionUp: {
      break;
    }
    case UISwipeGestureRecognizerDirectionDown: {
      break;
    }
  }
}

/**
 * 處理自定義手勢
 *
 * @param recognizer 自定義手勢識別器對象實例
 */
- (void)handleCustomGestureRecognizer:(KMGestureRecognizer *)recognizer {
  //代碼塊方式封裝操作方法
  void (^positionOperation)() = ^() {
    CGPoint newPoint = recognizer.view.center;
    newPoint.x -= 20.0;
    _imgV.center = newPoint;
    
    newPoint.x += 40.0;
    _imgV2.center = newPoint;
  };
  
  positionOperation();
}


#pragma mark - 綁定手勢操作
/**
 * 綁定拖動手勢
 *
 * @param imgVCustom 綁定到圖片視圖對象實例
 */
- (void)bindPan:(UIImageView *)imgVCustom {
  UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                         action:@selector(handlePan:)];
  [imgVCustom addGestureRecognizer:recognizer];
}

/**
 * 綁定捏合手勢
 *
 * @param imgVCustom 綁定到圖片視圖對象實例
 */
- (void)bindPinch:(UIImageView *)imgVCustom {
  UIPinchGestureRecognizer *recognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self
                                           action:@selector(handlePinch:)];
  [imgVCustom addGestureRecognizer:recognizer];
  //[recognizer requireGestureRecognizerToFail:imgVCustom.gestureRecognizers.firstObject];
}

/**
 * 綁定旋轉(zhuǎn)手勢
 *
 * @param imgVCustom 綁定到圖片視圖對象實例
 */
- (void)bindRotation:(UIImageView *)imgVCustom {
  UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self
                                              action:@selector(handleRotation:)];
  [imgVCustom addGestureRecognizer:recognizer];
}

/**
 * 綁定點按手勢
 *
 * @param imgVCustom 綁定到圖片視圖對象實例
 */
- (void)bindTap:(UIImageView *)imgVCustom {
  UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
                                         action:@selector(handleTap:)];
  //使用一根手指雙擊時,才觸發(fā)點按手勢識別器
  recognizer.numberOfTapsRequired = 2;
  recognizer.numberOfTouchesRequired = 1;
  [imgVCustom addGestureRecognizer:recognizer];
}

/**
 * 綁定長按手勢
 *
 * @param imgVCustom 綁定到圖片視圖對象實例
 */
- (void)bindLongPress:(UIImageView *)imgVCustom {
  UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
  recognizer.minimumPressDuration = 0.5; //設(shè)置最小長按時間;默認為0.5秒
  [imgVCustom addGestureRecognizer:recognizer];
}

/**
 * 綁定輕掃手勢;支持四個方向的輕掃,但是不同的方向要分別定義輕掃手勢
 */
- (void)bindSwipe {
  //向右輕掃手勢
  UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
                                           action:@selector(handleSwipe:)];
  recognizer.direction = UISwipeGestureRecognizerDirectionRight; //設(shè)置輕掃方向;默認是 UISwipeGestureRecognizerDirectionRight,即向右輕掃
  [self.view addGestureRecognizer:recognizer];
  [recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //設(shè)置以自定義撓癢手勢優(yōu)先識別
  
  //向左輕掃手勢
  recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
                              action:@selector(handleSwipe:)];
  recognizer.direction = UISwipeGestureRecognizerDirectionLeft;
  [self.view addGestureRecognizer:recognizer];
  [recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //設(shè)置以自定義撓癢手勢優(yōu)先識別
}

/**
 * 綁定自定義撓癢手勢;判斷是否有三次不同方向的動作,如果有則手勢結(jié)束,將執(zhí)行回調(diào)方法
 */
- (void)bingCustomGestureRecognizer {
  //當(dāng) recognizer.state 為 UIGestureRecognizerStateEnded 時,才執(zhí)行回調(diào)方法 handleCustomGestureRecognizer:
  
  //_customGestureRecognizer = [KMGestureRecognizer new];
  _customGestureRecognizer = [[KMGestureRecognizer alloc] initWithTarget:self
                                  action:@selector(handleCustomGestureRecognizer:)];
  [self.view addGestureRecognizer:_customGestureRecognizer];
}

- (void)layoutUI {
  //圖片視圖 _imgV
  UIImage *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;
  _imgV.layer.cornerRadius = cornerRadius;
  _imgV.layer.borderWidth = 2.0;
  _imgV.layer.borderColor = [UIColor grayColor].CGColor;
  [self.view addSubview:_imgV];
  
  //圖片視圖 _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;
  _imgV2.layer.cornerRadius = 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];
  
  //為了處理手勢識別優(yōu)先級的問題,這里需先綁定自定義撓癢手勢
  [self bingCustomGestureRecognizer];
  [self bindSwipe];
}

@end

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