#pragma mark - Touch Event Methods// 用戶第一次觸摸屏幕時被調用- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{}// 當發生某些事件（如來電呼叫）導致手勢中斷時被調用- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{}// 當用戶手指離開屏幕時被調用- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{}// 當用戶手指移動時觸發- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{}

//// ViewController.m// Swipes//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"// 設置檢測范圍static CGFloat const kMinimmGestureLength = 25;static CGFloat const kMaximmVariance = 5;@interface ViewController ()@property (weak, nonatomic) IBOutlet UILabel *label;@property (nonatomic) CGPoint gestureStartPoint;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}- (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{  UITouch *touch = [touches anyObject];  CGPoint currentPosition = [touch locationInView:self.view];  // 返回一個float的絕對值  CGFloat deltaX = fabsf(self.gestureStartPoint.x - currentPosition.x);  CGFloat deltaY = fabsf(self.gestureStartPoint.y - currentPosition.y);    // 獲得兩個增量后，判斷用戶在兩個方向上移動過的距離，檢測用戶是否在一個方向上移動得足夠遠但在另一個方向移動得不夠來形成輕掃動作  if (deltaX >= kMinimmGestureLength && deltaY <= kMaximmVariance) {    self.label.text = @"Horizontal swipe detected";    // 2s后擦除文本    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),            dispatch_get_main_queue(),            ^{      self.label.text = @"";    });  }else if (deltaY >= kMinimmGestureLength && deltaX <= kMaximmVariance){    self.label.text = @"Vertical swipe detected";    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{      self.label.text = @"";    });  }}@end

//// ViewController.m// Swipes//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UILabel *label;@property (nonatomic) CGPoint gestureStartPoint;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  //創建兩個手勢識別器  // 1、水平方向識別器  UISwipeGestureRecognizer *horizontal = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(reportHorizontalSwipe:)];  horizontal.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;  [self.view addGestureRecognizer:horizontal];    // 2、垂直方向識別器  UISwipeGestureRecognizer *vertical = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(reportVerticalSwipe:)];  vertical.direction = UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown;  [self.view addGestureRecognizer:vertical];}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}- (void)reportHorizontalSwipe:(UIGestureRecognizer *)recognizer{  self.label.text = @"Horizontal swipe detected";  // 2s后擦除文本  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),          dispatch_get_main_queue(),          ^{            self.label.text = @"";          });}- (void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer{  self.label.text = @"Vertical swipe detected";  // 2s后擦除文本  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),          dispatch_get_main_queue(),          ^{            self.label.text = @"";          });}@end

//// ViewController.m// Swipes//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UILabel *label;@property (nonatomic) CGPoint gestureStartPoint;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.    for (NSUInteger touchCount = 1; touchCount <= 5; touchCount++) {    //創建兩個手勢識別器    // 1、水平方向識別器    UISwipeGestureRecognizer *horizontal = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(reportHorizontalSwipe:)];        horizontal.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;    [self.view addGestureRecognizer:horizontal];        // 2、垂直方向識別器    UISwipeGestureRecognizer *vertical = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(reportVerticalSwipe:)];    vertical.direction = UISwipeGestureRecognizerDirectionUp | UISwipeGestureRecognizerDirectionDown;    [self.view addGestureRecognizer:vertical];  }  }- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}- (NSString *)descriptionForTouchCount:(NSUInteger)touchCount{  switch (touchCount) {    case 1:      return @"Single";    case 2:      return @"Double";    case 3:      return @"Triple";    case 4:      return @"Quadruple";    case 5:      return @"Quintuple";          default:      return @"";  }}- (void)reportHorizontalSwipe:(UIGestureRecognizer *)recognizer{  self.label.text = [NSString stringWithFormat:@"%@ Horizontal swipe detected",[self descriptionForTouchCount:[recognizer numberOfTouches]]];  // 2s后擦除文本  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),          dispatch_get_main_queue(),          ^{            self.label.text = @"";          });}- (void)reportVerticalSwipe:(UIGestureRecognizer *)recognizer{  self.label.text = [NSString stringWithFormat:@"%@ Vertical swipe detected",[self descriptionForTouchCount:[recognizer numberOfTouches]]];  // 2s后擦除文本  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)),          dispatch_get_main_queue(),          ^{            self.label.text = @"";          });}@end

//// ViewController.m// TapTaps//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UILabel *singleLabel;@property (weak, nonatomic) IBOutlet UILabel *doubleLabel;@property (weak, nonatomic) IBOutlet UILabel *tripleLabel;@property (weak, nonatomic) IBOutlet UILabel *quadrupleLabel;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  // 創建4個點擊手勢識別器  UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap)];  singleTap.numberOfTapsRequired = 1;  singleTap.numberOfTouchesRequired = 1;  // 附加到視圖  [self.view addGestureRecognizer:singleTap];    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap)];  doubleTap.numberOfTapsRequired = 2;  doubleTap.numberOfTouchesRequired = 1;  [self.view addGestureRecognizer:doubleTap];  // 當doubleTap響應“失敗”才運行singleTap  [singleTap requireGestureRecognizerToFail:doubleTap];    UITapGestureRecognizer *tripleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tripleTap)];  tripleTap.numberOfTapsRequired = 3;  tripleTap.numberOfTouchesRequired = 1;  [self.view addGestureRecognizer:tripleTap];  [doubleTap requireGestureRecognizerToFail:tripleTap];    UITapGestureRecognizer *quadrupleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(quadrupleTap)];  quadrupleTap.numberOfTapsRequired = 4;  quadrupleTap.numberOfTouchesRequired = 1;  [self.view addGestureRecognizer:quadrupleTap];  [tripleTap requireGestureRecognizerToFail:quadrupleTap];}- (void)singleTap{  self.singleLabel.text = @"Single Tap Detected";  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    self.singleLabel.text = @"";  });}- (void)doubleTap{  self.doubleLabel.text = @"Double Tap Detected";  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    self.doubleLabel.text = @"";  });}- (void)tripleTap{  self.tripleLabel.text = @"Triple Tap Detected";  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    self.tripleLabel.text = @"";  });}- (void)quadrupleTap{  self.quadrupleLabel.text = @"Quadruple Tap Detected";  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    self.quadrupleLabel.text = @"";  });}@end

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIGestureRecognizerDelegate>@end

//// ViewController.m// PinchMe//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (strong,nonatomic) UIImageView *imageView;@end@implementation ViewController// 當前縮放比例，先前縮放比例CGFloat scale,previousScale;// 當前旋轉角度，先前旋轉角度CGFloat rotation,previousRotation;- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  previousScale = 1;    UIImage *image = [UIImage imageNamed:@"yosemite-meadows"];  self.imageView = [[UIImageView alloc] initWithImage:image];  // 對圖像啟用交互功能  self.imageView.userInteractionEnabled = YES;  self.imageView.center = self.view.center;  [self.view addSubview:self.imageView];    // 建立捏合手勢識別器  UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(doPinch:)];  pinchGesture.delegate = self;  [self.imageView addGestureRecognizer:pinchGesture];    // 建立旋轉手勢識別器  UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(doRorate:)];  rotationGesture.delegate = self;  [self.imageView addGestureRecognizer:rotationGesture];}- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{  // 允許捏合手勢和旋轉手勢同時工作。否則，先開始的手勢識別器會屏蔽另一個  return YES;}// 根據手勢識別器中獲得的縮放比例和旋轉角度對圖像進行變換- (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)doRorate:(UIRotationGestureRecognizer *)gesture{  rotation = gesture.rotation;  [self transformImageView];  if (gesture.state == UIGestureRecognizerStateEnded) {    previousRotation = rotation + previousRotation;    rotation = 0;  }}@end

//// CheckMarkRecognizer.m// CheckPlease//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "CheckMarkRecognizer.h"#import "CGPointUtils.h"#import <UIKit/UIGestureRecognizerSubclass.h> // 一個重要目的是使手勢識別器的state屬性可寫，子類將使用這個機制斷言我們所觀察的手勢已成功完成// 設置檢測范圍static CGFloat const kMinimunCheckMarkAngle = 80;static CGFloat const kMaximumCheckMarkAngle = 100;static CGFloat const kMinimumCheckMarkLength = 10;@implementation CheckMarkRecognizer{  // 前兩個實例變量提供之前的線段  CGPoint lastPreviousPoint;  CGPoint lastCurrentPoint;  // 畫出的線段長度  CGFloat lineLengthSoFar;}// 用lastPreviousPoint和lastCurrentPoint組成第一條線段，跟第二條線段形成角度去完成手勢- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{  [super touchesBegan:touches withEvent:event];  UITouch *touch = [touches anyObject];  CGPoint point = [touch locationInView:self.view];  lastPreviousPoint = point;  lastCurrentPoint = point;  lineLengthSoFar = 0.0;}- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{  [super touchesMoved:touches withEvent:event];  UITouch *touch = [touches anyObject];  CGPoint previousPoint = [touch previousLocationInView:self.view];  CGPoint currentPoint = [touch locationInView:self.view];  CGFloat angle = angleBetweenLines(lastPreviousPoint, lastCurrentPoint, previousPoint, currentPoint);  if (angle >= kMinimunCheckMarkAngle && angle <= kMaximumCheckMarkAngle && lineLengthSoFar > kMinimumCheckMarkLength) {    self.state = UIGestureRecognizerStateRecognized;  }  lineLengthSoFar += distanceBetweenPoints(previousPoint, currentPoint);  lastPreviousPoint = previousPoint;  lastCurrentPoint = currentPoint;}@end

//// ViewController.m// CheckPlease//// Created by Jierism on 16/8/4.// Copyright © 2016年 Jierism. All rights reserved.//#import "ViewController.h"#import "CheckMarkRecognizer.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.  CheckMarkRecognizer *check = [[CheckMarkRecognizer alloc] initWithTarget:self action:@selector(doCheck:)];  [self.view addGestureRecognizer:check];  self.imageView.hidden = YES;}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}- (void)doCheck:(CheckMarkRecognizer *)check{  self.imageView.hidden = NO;  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    self.imageView.hidden = YES;  });}@end