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(60, 184, 200, 200))];
    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(120, 50, 200, 200);
    // 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 = 1; // 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 = 0;
    
    
    
}

#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