UI中的七种手势

 //
 //  GestureRecognizerViewController.m

 #import "GestureRecognizerViewController.h"
 #import "UIColor+RandomColor.h"
 @interface GestureRecognizerViewController ()
 {

     CGRect _frame; // 用来记录view原来的frame

 }
 @end

 @implementation GestureRecognizerViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view.
 //    UIGestureRecognizer 手势识别器,是所有手势识别类的基类,提供了手势识别器的基本功能,有了手势识别器之后,手势的识别全部由这个类来识别,我们就不再关心手势识别的过程,我们只需要关心手势识别之后应该做哪些操作,它的子类有6个,轻拍手势,捏合手势,长按手势,轻扫手势,旋转手势,平移手势,以及平移手势的子类 屏幕边缘手势

     UIView *view = [[UIView alloc]initWithFrame:(CGRectMake(, , , ))];
     view.backgroundColor = [UIColor redColor];
     [self.view addSubview:view];
     [view release];

     //! 轻拍手势  这种手势用的最多, 跟按钮似的

     // UITapGestureRecognizer
     /*
     // 1. 创建轻拍手势对象
     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; // self指视图控制器的对象

     // 2. 设置轻拍触发方法时,需要的点击次数  // 一定要在添加手势之前设置
     tapGesture.numberOfTapsRequired = 2;
     tapGesture.numberOfTouchesRequired = 2;

     // 3. 向视图对象上添加手势
     [view addGestureRecognizer:tapGesture]; // 多态 父类指针指向子类对象
 //    [view addGestureRecognizer:<#(UIGestureRecognizer *)#>]

     [tapGesture release];
     */

     /**
      1. 创建手势识别类的对象(轻拍手势/ 长按手势/ 轻扫手势/ 平移手势/ 捏合手势/ 旋转手势/ 屏幕边缘手势)

      2. 设置手势方法的相关属性(如需要几根手指,多长时间才能触发手势事件 等)   // 根据需要

      3. 向视图对象上添加手势

      4. 释放手势对象

      */

     // 长按手势 UILongPressGestureRecognizer
    /*
     UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressGesture:)];
     // 设置长按手势最短的触发事件 秒为单位
     longPressGesture.minimumPressDuration = 1;

     [view addGestureRecognizer:longPressGesture];

     [longPressGesture release];
     */

     // 轻扫手势 UISwipeGestureRecognizer

     UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeGesture:)];

     // 设置轻扫手势支持的方法 (默认是向右扫)
     // UISwipeGestureRecognizerDirectionDown 向下扫
     swipeGesture.direction = UISwipeGestureRecognizerDirectionDown; // 一定要在添加手势之前设置

     [view addGestureRecognizer:swipeGesture];

     [swipeGesture release];

     // 一个视图可以添加多个手势
     // 想要实现多个方向轻扫手势: 再添加一个轻扫手势
     UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
     // UISwipeGestureRecognizerDirectionLeft 向左轻扫
     swipe.direction = UISwipeGestureRecognizerDirectionLeft;

     [view addGestureRecognizer:swipe];
     [swipe release];

     // 平移手势 UIPanGestureRecognizer

     UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesTure:)];

     [view addGestureRecognizer:panGesture];
     [panGesture release];

     // 捏合手势 UIPinchGestureRecognizer

     UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinchGesture:)];

 //    pinchGesture.scale

     [view addGestureRecognizer:pinchGesture];
     [pinchGesture release];

     // 旋转手势

 //    UIRotationGestureRecognizer
     UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotationGesture:)];
     [view addGestureRecognizer:rotationGesture];
     [rotationGesture release];

     // 屏幕边缘手势 UIScreenEdgePanGestureRecognizer 是UIPanGestureRecognizer的子类

     UIScreenEdgePanGestureRecognizer *screenEdgePanGesture = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleScreenEdgeGesture:)];

     // 设置屏幕边缘手势支持方法
     screenEdgePanGesture.edges = UIRectEdgeRight;
     // 必须让位置和屏幕边缘重合
     view.frame = CGRectMake(, , , );
     // 使每次移动后的view回到原始位置,实现在action方法中
     _frame = view.frame;

     [view addGestureRecognizer:screenEdgePanGesture];

     [screenEdgePanGesture release];

 }
 #pragma mark - 轻拍手势方法
 - (void)handleTapGesture:(UITapGestureRecognizer *)tapGesture {

     // 获取轻拍手势所在的视图对象
     tapGesture.view.backgroundColor = [UIColor randomColor];

 }

 #pragma mark - 长按手势方法
 - (void)handleLongPressGesture:(UILongPressGestureRecognizer *)longPressGesture {

     // UIGestureRecognizerStateBegan 当达到条件((longPressGesture.minimumPressDuration = 1;))界限时,触发方法事件
     // UIGestureRecognizerStateChanged 当达到条件时,滑动,触发
     // UIGestureRecognizerStateEnded 当达到条件,手指离开,触发

     // 根据长按手势的状态执行
     if (longPressGesture.state == UIGestureRecognizerStateEnded) {

         longPressGesture.view.superview.backgroundColor = [UIColor randomColor];

     }

 }

 #pragma mark - 轻扫手势方法
 - (void)handleSwipeGesture:(UISwipeGestureRecognizer *)swipeGesture {

     swipeGesture.view.backgroundColor = [UIColor randomColor];

 }

 - (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {

     swipe.view.backgroundColor = [UIColor randomColor];
 }

 #pragma mark - 平移手势方法
 - (void)handlePanGesTure:(UIPanGestureRecognizer *)panGesture {

     // 1. 获取平移增量
     CGPoint point = [panGesture translationInView:panGesture.view];
     // 2. 让视图的位置发生移动,以上次视图为基准,transform 仿射变换技术 (view上所有点跟随移动) 用了线性代数的知识
     panGesture.view.transform = CGAffineTransformTranslate(panGesture.view.transform, point.x, point.y);
     //3. 将上次的平移增量置为0
     //CGPointZero 代表一个(0, 0)的结构体 CGPointMake(0, 0)
     [panGesture setTranslation:CGPointZero inView:panGesture.view];

     panGesture.view.backgroundColor = [UIColor randomColor];

 }

 #pragma mark - 捏合手势方法
 - (void)handlePinchGesture:(UIPinchGestureRecognizer *)pinchGesture {

     // 1.根据比例做放射变换, 也是以上次视图为基准  Scale 比例
     pinchGesture.view.transform = CGAffineTransformScale(pinchGesture.view.transform, pinchGesture.scale, pinchGesture.scale);
     // 2.将上次的缩放比例置为1
     pinchGesture.scale = ; // 或者[pinchGesture setScale:1];

     //pinchGesture.view.backgroundColor = [UIColor randomColor];

 }

 #pragma mark - 旋转手势方法
 - (void)handleRotationGesture:(UIRotationGestureRecognizer *)rotationGesture {
     // 1. 根据旋转角度做放射变换,也是以上次视图形变量为基准 rotation 旋转,旋度
     rotationGesture.view.transform = CGAffineTransformRotate(rotationGesture.view.transform, rotationGesture.rotation);
     // 2. 将上次的旋转角度清零
     rotationGesture.rotation = ;

 }

 #pragma mark - 边缘手势方法
 // 方法和UIPanGestureRecognizer(平移手势)一样
 - (void)handleScreenEdgeGesture:(UIScreenEdgePanGestureRecognizer *)screenEdgeGesture {

     // 手指离开的时候 ,view回到原来的位置
     if (screenEdgeGesture.state == UIGestureRecognizerStateEnded) {

         screenEdgeGesture.view.frame = _frame;
     }

     // 1.获取手指的平移增量
     CGPoint point = [screenEdgeGesture translationInView:screenEdgeGesture.view];
     // 2.根据平移增量做仿射变换
     screenEdgeGesture.view.transform = CGAffineTransformTranslate(screenEdgeGesture.view.transform, point.x, point.y);
     // 3. 把平移增量置为0的结构体
     [screenEdgeGesture setTranslation:CGPointZero inView:screenEdgeGesture.view];

     //screenEdgeGesture.view.frame = _frame;
     //NSLog(@"触发了");

 }

 - (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

随机颜色

 //
 //  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