[摘要]本文是對UI中的七種手勢的講解，對學習IOS蘋果軟件開發有所幫助,與大家分享。

 //
 //  GestureRecognizerViewController.m


 
 #import "GestureRecognizerViewController.h"
 #import "UIColor+RandomColor.h"
 @interface GestureRecognizerViewController ()
 {
     
     CGRect _frame; // 用來記錄view原來的frame
     
 }
 @end
 
 @implementation GestureRecognizerViewController
 
 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view.
 //    UIGestureRecognizer 手勢識別器,是所有手勢識別類的基類,提供了手勢識別器的基本功能,有了手勢識別器之後,手勢的識別全部由這個類來識別,我們就不再關心手勢識別的過程,我們只需要關心手勢識別之後應該做哪些操作,它的子類有6個,輕拍手勢,捏合手勢,長按手勢,輕掃手勢,旋轉手勢,平移手勢,以及平移手勢的子類 屏幕邊緣手勢
     
     UIView *view = [[UIView alloc]initWithFrame:(CGRectMake(60, 184, 200, 200))];
     view.backgroundColor = [UIColor redColor];
     [self.view addSubview:view];
     [view release];
     
     //! 輕拍手勢  這種手勢用的最多, 跟按鈕似的
    
     // UITapGestureRecognizer
     /*
     // 1. 創建輕拍手勢對象
     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; // self指視圖控制器的對象
     
     // 2. 設置輕拍觸發方法時,需要的點擊次數  // 一定要在添加手勢之前設置
     tapGesture.numberOfTapsRequired = 2;
     tapGesture.numberOfTouchesRequired = 2;
     
     // 3. 向視圖對象上添加手勢
     [view addGestureRecognizer:tapGesture]; // 多態 父類指針指向子類對象
 //    [view addGestureRecognizer:<#(UIGestureRecognizer *)#>]
     
     [tapGesture release];
     */
     
     /**
      1. 創建手勢識別類的對象(輕拍手勢/ 長按手勢/ 輕掃手勢/ 平移手勢/ 捏合手勢/ 旋轉手勢/ 屏幕邊緣手勢)
      
      2. 設置手勢方法的相關屬性(如需要幾根手指,多長時間才能觸發手勢事件 等)   // 根據需要
      
      3. 向視圖對象上添加手勢
      
      4. 釋放手勢對象
      
      
      */
     
     // 長按手勢 UILongPressGestureRecognizer
    /*
     UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressGesture:)];
     // 設置長按手勢最短的觸發事件 秒為單位
     longPressGesture.minimumPressDuration = 1;
     
     [view addGestureRecognizer:longPressGesture];
     
     [longPressGesture release];
     */
     
     // 輕掃手勢 UISwipeGestureRecognizer
     
     UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];
     
     // 設置輕掃手勢支持的方法 (默認是向右掃)
     // UISwipeGestureRecognizerDirectionDown 向下掃
     swipeGesture.direction = UISwipeGestureRecognizerDirectionDown; // 一定要在添加手勢之前設置
     
     [view addGestureRecognizer:swipeGesture];
     
     [swipeGesture release];
     
     // 一個視圖可以添加多個手勢
     // 想要實現多個方向輕掃手勢: 再添加一個輕掃手勢
     UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
     // UISwipeGestureRecognizerDirectionLeft 向左輕掃
     swipe.direction = UISwipeGestureRecognizerDirectionLeft;
     
     [view addGestureRecognizer:swipe];
     [swipe release];
     
     
     // 平移手勢 UIPanGestureRecognizer
 
     UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesTure:)];
     
     [view addGestureRecognizer:panGesture];
     [panGesture release];
     
     
     
     // 捏合手勢 UIPinchGestureRecognizer
     
     UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)];
     
 //    pinchGesture.scale
     
     [view addGestureRecognizer:pinchGesture];
     [pinchGesture release];
     
     
     
     // 旋轉手勢
     
 //    UIRotationGestureRecognizer
     UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotationGesture:)];
     [view addGestureRecognizer:rotationGesture];
     [rotationGesture release];
     
     
     // 屏幕邊緣手勢 UIScreenEdgePanGestureRecognizer 是UIPanGestureRecognizer的子類
     
     UIScreenEdgePanGestureRecognizer *screenEdgePanGesture = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleScreenEdgeGesture:)];
     
     // 設置屏幕邊緣手勢支持方法
     screenEdgePanGesture.edges = UIRectEdgeRight;
     // 必須讓位置和屏幕邊緣重合
     view.frame = CGRectMake(120, 50, 200, 200);
     // 使每次移動後的view回到原始位置,實現在action方法中
     _frame = view.frame;
     
     [view addGestureRecognizer:screenEdgePanGesture];
     
     
     [screenEdgePanGesture release];
     
     
 }
 #pragma mark - 輕拍手勢方法
 - (void)handleTapGesture:(UITapGestureRecognizer *)tapGesture {
     
     // 獲取輕拍手勢所在的視圖對象
     tapGesture.view.backgroundColor = [UIColor randomColor];
     
 }
 
 
 
 #pragma mark - 長按手勢方法
 - (void)handleLongPressGesture:(UILongPressGestureRecognizer *)longPressGesture {
     
     // UIGestureRecognizerStateBegan 當達到條件((longPressGesture.minimumPressDuration = 1;))界限時,觸發方法事件
     // UIGestureRecognizerStateChanged 當達到條件時,滑動,觸發
     // UIGestureRecognizerStateEnded 當達到條件,手指離開,觸發
     
     // 根據長按手勢的狀態執行
     if (longPressGesture.state == UIGestureRecognizerStateEnded) {
         
         longPressGesture.view.superview.backgroundColor = [UIColor randomColor];
 
     }
     
 }
 
 #pragma mark - 輕掃手勢方法
 - (void)handleSwipeGesture:(UISwipeGestureRecognizer *)swipeGesture {
     
     swipeGesture.view.backgroundColor = [UIColor randomColor];
     
 }
 
 - (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
     
     swipe.view.backgroundColor = [UIColor randomColor];
 }
 
 
 
 #pragma mark - 平移手勢方法
 - (void)handlePanGesTure:(UIPanGestureRecognizer *)panGesture {
     
     // 1. 獲取平移增量
     CGPoint point = [panGesture translationInView:panGesture.view];
     // 2. 讓視圖的位置發生移動,以上次視圖為基准,transform 仿射變換技術 (view上所有點跟隨移動) 用了線性代數的知識
     panGesture.view.transform = CGAffineTransformTranslate(panGesture.view.transform, point.x, point.y);
     //3. 將上次的平移增量置為0
     //CGPointZero 代表一個(0, 0)的結構體 CGPointMake(0, 0)
     [panGesture setTranslation:CGPointZero inView:panGesture.view];
     
     panGesture.view.backgroundColor = [UIColor randomColor];
     
 }
 
 #pragma mark - 捏合手勢方法
 - (void)handlePinchGesture:(UIPinchGestureRecognizer *)pinchGesture {
     
     // 1.根據比例做放射變換, 也是以上次視圖為基准  Scale 比例
     pinchGesture.view.transform = CGAffineTransformScale(pinchGesture.view.transform, pinchGesture.scale, pinchGesture.scale);
     // 2.將上次的縮放比例置為1
     pinchGesture.scale = 1; // 或者[pinchGesture setScale:1];
     
     //pinchGesture.view.backgroundColor = [UIColor randomColor];
     
 }
 
 #pragma mark - 旋轉手勢方法
 - (void)handleRotationGesture:(UIRotationGestureRecognizer *)rotationGesture {
     // 1. 根據旋轉角度做放射變換,也是以上次視圖形變量為基准 rotation 旋轉,旋度
     rotationGesture.view.transform = CGAffineTransformRotate(rotationGesture.view.transform, rotationGesture.rotation);
     // 2. 將上次的旋轉角度清零
     rotationGesture.rotation = 0;
     
     
     
 }
 
 #pragma mark - 邊緣手勢方法
 // 方法和UIPanGestureRecognizer(平移手勢)一樣
 - (void)handleScreenEdgeGesture:(UIScreenEdgePanGestureRecognizer *)screenEdgeGesture {
     
     // 手指離開的時候 ,view回到原來的位置
     if (screenEdgeGesture.state == UIGestureRecognizerStateEnded) {
         
         screenEdgeGesture.view.frame = _frame;
     }
     
     // 1.獲取手指的平移增量
     CGPoint point = [screenEdgeGesture translationInView:screenEdgeGesture.view];
     // 2.根據平移增量做仿射變換
     screenEdgeGesture.view.transform = CGAffineTransformTranslate(screenEdgeGesture.view.transform, point.x, point.y);
     // 3. 把平移增量置為0的結構體
     [screenEdgeGesture setTranslation:CGPointZero inView:screenEdgeGesture.view];
     
     //screenEdgeGesture.view.frame = _frame;
     //NSLog(@"觸發了");
     
 }
 
 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }
 /*
 #pragma mark - Navigation
 
 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
     // Get the new view controller using [segue destinationViewController].
     // Pass the selected object to the new view controller.
 }
 */
 
 @end

隨機顏色

 //
 //  UIColor+RandomColor.h
 //  UILessonTouch-04
 
 #import <UIKit/UIKit.h>
 
 @interface UIColor (RandomColor)
 + (UIColor *)randomColor;
 @end

 //
 //  UIColor+RandomColor.m
 //  UILessonTouch-04
 
 #import "UIColor+RandomColor.h"
 #define kColorValue arc4random_uniform(256) / 255.0
 @implementation UIColor (RandomColor)
 
 + (UIColor *)randomColor {
     
     return [UIColor colorWithRed:kColorValue green:kColorValue blue:kColorValue alpha:kColorValue];
     
 }
 
 @end