01 触摸事件

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1.事件处理方法

- (void)viewDidLoad {    [super viewDidLoad];        self.view.backgroundColor = [UIColor redColor];        // 默认NO 多点触摸    self.view.multipleTouchEnabled = YES;    // 默认view YES 交互关闭 imageView 默认关闭    //self.view.userInteractionEnabled = YES;        // 如果父视图的交互关闭，会影响到子视图    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    button.frame = CGRectMake(60, 100, 200, 35);    [button setTitle:@"action" forState:UIControlStateNormal];    [self.view addSubview:button];}/** *  重复父类的方法 */- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    // UITouch -> 触摸 -> 手指头数量（触摸点数量）    //NSLog(@"开始触摸 : %d", [touches count]);    // 获取touch对象    UITouch *touch = [touches anyObject];    /*    NSLog(@"阶段 ： %d", [touch phase]);    // 获取窗口对象    UIWindow *widow = [touch window];    */    // 获取点击次数    NSUInteger tapCount = [touch tapCount];    NSLog(@"tap : %lu", (unsigned long)tapCount);    //  获取当前的位置    CGPoint location = [touch locationInView:self.view];    NSLog(@"location : %@", NSStringFromCGPoint(location));        }// 开始触摸- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{    /*    UITouch *touch = [touches anyObject];    // 获取前一个位置    CGPoint previous = [touch previousLocationInView:self.view];    NSLog(@"previous : %@", NSStringFromCGPoint(previous));    */}// 开始移动- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    NSLog(@"触摸结束");}// 触摸结束- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{    NSLog(@"触摸被取消");}// 触摸被取消，一定在触摸事件在执行时，才有取消的条件(比如电话)

</pre><pre name="code" class="objc">还学到了：

01.// 设置状态栏的背景风格

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];

02.Button可以响应多个Target事件1

03.设置父视图的userInteractionEnable为NO，会影响到其子视图。和设置alpha类似，当视图透明时，其子视图也会发生变化。

</pre><pre name="code" class="objc">2.练习

- (void)viewDidLoad {        [super viewDidLoad];        self.view.multipleTouchEnabled = YES;}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    UITouch *touch = [touches anyObject];    /*    // 单击&双击 ； 双手单机&双手双击    if ([touch tapCount] == 2 && [touches count] == 2) {                // 取消上一个调用的方法        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(singleTap) object:nil];              [self doubleTap];            }else if ([touch tapCount] == 1 && [touches count] == 2) {

<span style="white-space:pre"></span>// 延迟<span style="white-space:pre"></span>[self performSelector:@selector(singleTap) withObject:nil afterDelay:0.2];    }    */        // 获取当前位置    _precious = [touch locationInView:self.view];    }// 处理单机&双击事件- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    UITouch *touch = [touches anyObject];    CGPoint end = [touch locationInView:self.view];

<span style="white-space:pre"></span>// 位差调用    if (fabs(end.x - _precious.x) > 100.f) {        NSLog(@"hehe");    }}#pragma mark - Private Methods- (void)singleTap{    NSLog(@"singleTap");}- (void)doubleTap{    NSLog(@"doubleTap");}

3.响应事件者链

01.事件传递

UIApplication对象从事件队列中取出最前面的事件并将其分发。通常，其发送事件交由应用程序的主窗口——UIWindow实例，再由窗口对象发送事件给“第一响应者（触摸的视图）”处理。

</pre><pre name="code" class="objc">- (void)viewDidLoad {    [super viewDidLoad];        // View    /*    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    button.frame = CGRectMake(60, 100, 200, 35);    [button setTitle:@"action" forState:UIControlStateNormal];    [button addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];    */        // GestureRecognizer    /*    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(test)];    [self.view addGestureRecognizer:tap];    */        // 下一个响应者测试    /*    MyView *view = [[MyView alloc] initWithFrame:CGRectMake(60, 200, 200, 200)];    view.backgroundColor = [UIColor redColor];    [self.view addSubview:view];    */        // imageView    UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 200)];    imgView.userInteractionEnabled = YES;    imgView.backgroundColor = [UIColor redColor];    [self.view addSubview:imgView];        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    button.frame = CGRectMake(50, 100, 100, 35);    button.backgroundColor = [UIColor grayColor];    [button setTitle:@"action" forState:UIControlStateNormal];    [imgView addSubview:button];}- (void)test{    NSLog(@"用户点击");}

// 子类化窗口

#import "MyWindow.h"@implementation MyWindow- (void)sendEvent:(UIEvent *)event{    NSLog(@"发糖");    [super sendEvent:event];}// 所有的事件都是由app交给窗口分发出去的@end

还学到：

001.有些情况可有多个窗口的存在（比如：在qq消息的提示位置也有一个窗口），但只能有一个keyWindow.

</pre><pre name="code" class="objc">2.响应事件者链

响应事件者链表示一系列的响应者对象。事件被交由第一响应者对象处理，如果第一响应者不处理，事件被沿着响应者链向上传递，交给下一个响应者（next responder），如果响应，事件就会被截获（处理）。

// 查看响应层次结构

id next = [[[[[[self nextResponder] nextResponder] nextResponder] nextResponder] nextResponder] nextResponder];

01.过程

</pre><pre name="code" class="objc" style="font-size: 14px;"><span style="font-family: Arial, Helvetica, sans-serif;">- (id)initWithFrame:(CGRect)frame </span><span style="font-family: Arial, Helvetica, sans-serif;">{</span>

    self = [super initWithFrame:frame];    if (self) {                UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];        button.alpha = 0.01;                button.frame = CGRectMake(50, 100, 100, 35);        button.backgroundColor = [UIColor lightGrayColor];        [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];        [button setTitle:@"push" forState:UIControlStateNormal];        [self addSubview:button];            }    return self;}- (void)click:(UIButton *)sender{    id next = [self nextResponder];        while (next != nil) {                NSLog(@"next : %@", next);                next = [next nextResponder];                if ([next isKindOfClass:[UIViewController class]]) {                        UIViewController *vc = next;            DetailViewController *detail = [[DetailViewController alloc] init];            [vc.navigationController pushViewController:detail animated:YES];            break;        }    }}

3.事件拦截

userInteractionEnabled = NO;

hidden = YES;

alpha[[0~0.01]范围];

4.手势识别器

</pre><pre name="code" class="objc">- (void)viewDidLoad {        [super viewDidLoad];        /**     *  单击、双击     */    /*    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];    // 次数（单击、双击）    singleTap.numberOfTapsRequired = 1;    // 触摸数量（手指头的数量）    singleTap.numberOfTouchesRequired = 1;    [self.view addGestureRecognizer:singleTap];        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];    // 次数（单击、双击）    doubleTap.numberOfTapsRequired = 2;    // 触摸数量（手指头的数量）    //doubleTap.numberOfTouchesRequired = 2;    [self.view addGestureRecognizer:doubleTap];        // 当双击时，单击失效    [singleTap requireGestureRecognizerToFail:doubleTap];    */        /**     *  轻扫  不能一个手指识别多个方向。     */    /*    UISwipeGestureRecognizer *swipe1 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];    swipe1.direction = UISwipeGestureRecognizerDirectionRight;    [self.view addGestureRecognizer:swipe1];        UISwipeGestureRecognizer *swipe2 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];    swipe2.direction = UISwipeGestureRecognizerDirectionLeft;    [self.view addGestureRecognizer:swipe2];     */        /**     *  轻扫     */    /*    _panView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 40, 40)];    _panView.backgroundColor = [UIColor redColor];    [self.view addSubview:_panView];        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];    [self.view addGestureRecognizer:pan];    */        /**     *  长按     */    /*    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];    longPressGesture.minimumPressDuration = 2.f;    [self.view addGestureRecognizer:longPressGesture];    */        /**     *  旋转     */    /*    UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];    [self.view addGestureRecognizer:rotationGesture];    */        /**     *  捏合     */    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];    [self.view addGestureRecognizer:pinch];}- (void)singleTap:(UITapGestureRecognizer *)tap{    // 得到坐标位置    NSLog(@"单击 : %@", NSStringFromCGPoint([tap locationInView:self.view]));}- (void)doubleTap:(UITapGestureRecognizer *)tap{    NSLog(@"双击");}////////////////////////////////////////////////////////////////////////////////////////////////- (void)swipe:(UISwipeGestureRecognizer *)swipe{    NSLog(@"direction : %ld", swipe.direction);}////////////////////////////////////////////////////////////////////////////////////////////////- (void)pan:(UIPanGestureRecognizer *)pan{    CGPoint point = [pan locationInView:self.view];    _panView.center = point;}// move////////////////////////////////////////////////////////////////////////////////////////////////- (void)longPress:(UILongPressGestureRecognizer *)lon{    if (lon.state == UIGestureRecognizerStateBegan) {                NSLog(@"开始 : %ld", lon.state);            }else if (lon.state == UIGestureRecognizerStateEnded) {                NSLog(@"结束 : %ld", lon.state);            }else if (lon.state == UIGestureRecognizerStateChanged) {                NSLog(@"移动 : %ld", lon.state);            }}////////////////////////////////////////////////////////////////////////////////////////////////- (void)rotation:(UIRotationGestureRecognizer *)rotate{

<span style="white-space:pre"></span>//// 角度。

<span style="white-space:pre"></span>//float degress = rotate.rotation * (180 / M_PI);}////////////////////////////////////////////////////////////////////////////////////////////////- (void)pinch:(UIPinchGestureRecognizer *)pinch{    NSLog(@"pinch : %.1f", pinch.scale);        if (pinch.velocity > 0) {                NSLog(@"放大");            }else {                NSLog(@"放小");    }}

</pre><pre name="code" class="objc">

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