按滚动轻扫旋转哪个手势是apple magic trackpadd 特有的点按滚动轻扫旋转

[转载]Mac&配件
Mac Accessories
正確答案: 4 / 4
得分: 300 / 300
請閱讀測驗裡每一題的答案說明。結束後請關閉此視窗。
1 : & Magic Trackpad 和 Magic Mouse 支持许多相同的手势。哪个手势是
Magic Trackpad 特有的?
您所選的是: 旋转
正確!&顾客可以在 Magic Trackpad
Multi-Touch 表面上用拇指和食指进行顺时针或逆时针转动来旋转图像。
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ALT="[转载]Mac&配件"
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2 : & 顾客可通过菊花链方式连接到 Thunderbolt 端口的高性能 Thunderbolt
设备的数量上限是多少?
您所選的是: 六个
正確!&利用 Thunderbolt I/O
技术,顾客可通过菊链方式将多达六个 Thunderbolt 外围设备连接至 Thunderbolt
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3 : & 哪种技术可将 Apple Wireless Keyboard、Magic Mouse 和
Magic Trackpad 连接至 Mac?
您所選的是: 蓝牙
正確!&所有这些配件均通过蓝牙无线技术连接至
Mac,因此无需采用电线或单独的适配器。
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4 : & 顾客可以使用哪个应用程序轻松设置 Wi-Fi 网络和管理 Apple Wi-Fi
您所選的是: AirPort
正確!&每台 Mac 均包含 AirPort
实用工具,顾客可以使用该工具轻松设置 Wi-Fi 网络和管理 Apple Wi-Fi 基站。顾客还可以从 App Store
免费下载适用于 iOS 的 AirPort 实用工具。
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扫一扫 浏览移动版1、UIGestureRecognizer 介绍
手势识别在 iOS 中非常重要,他极大地提高了移动设备的使用便捷性。
iOS 系统在 3.2 以后,他提供了一些常用的手势(UIGestureRecognizer 的子类),开发者可以直接使用他们进行手势操作。
UIPanGestureRecognizer(拖动)
UIPinchGestureRecognizer(捏合)
UIRotationGestureRecognizer(旋转)
UITapGestureRecognizer(点按)
UILongPressGestureRecognizer(长按)
UISwipeGestureRecognizer(轻扫)
另外,可以通过继承&UIGestureRecognizer 类,实现自定义手势(手势识别器类)。
PS:自定义手势时,需要&#import &UIKit/UIGestureRecognizerSubclass.h&,一般需实现如下方法:
1 - (void)
3 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
4 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
5 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
6 - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;
7 //以上方法在分类 UIGestureRecognizer (UIGestureRecognizerProtected) 中声明,更多方法声明请自行查看
UIGestureRecognizer 的继承关系如下:
2、手势状态
在六种手势识别中,只有一种手势是离散型手势,他就是 UITapGestureRecognizer。
离散型手势的特点就是:一旦识别就无法取消,而且只会调用一次手势操作事件(初始化手势时指定的回调方法)。
换句话说其他五种手势是连续型手势,而连续型手势的特点就是:会多次调用手势操作事件,而且在连续手势识别后可以取消手势。从下图可以看出两者调用操作事件的次数是不同的:
手势状态枚举如下:
1 typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
UIGestureRecognizerStatePossible,
// 尚未识别是何种手势操作(但可能已经触发了触摸事件),默认状态
UIGestureRecognizerStateBegan,
// 手势已经开始,此时已经被识别,但是这个过程中可能发生变化,手势操作尚未完成
UIGestureRecognizerStateChanged,
// 手势状态发生转变
UIGestureRecognizerStateEnded,
// 手势识别操作完成(此时已经松开手指)
UIGestureRecognizerStateCancelled,
// 手势被取消,恢复到默认状态
UIGestureRecognizerStateFailed,
// 手势识别失败,恢复到默认状态
UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded // 手势识别完成,同UIGestureRecognizerStateEnded
对于离散型手势 UITapGestureRecgnizer 要么被识别,要么失败,点按(假设点按次数设置为1,并且没有添加长按手势)下去一次不松开则此时什么也不会发生,松开手指立即识别并调用操作事件,并且状态为3(已完成)。
但是连续型手势要复杂一些,就拿旋转手势来说,如果两个手指点下去不做任何操作,此时并不能识别手势(因为我们还没旋转)但是其实已经触发了触摸开始事件,此时处于状态0;如果此时旋转会被识别,也就会调用对应的操作事件,同时状态变成1(手势开始),但是状态1只有一瞬间;紧接着状态变为2(因为我们的旋转需要持续一会),并且重复调用操作事件(如果在事件中打印状态会重复打印2);松开手指,此时状态变为3,并调用1次操作事件。
3、使用手势的步骤
使用手势很简单,分为三步:
创建手势识别器对象实例。创建时,指定一个回调方法,当手势开始,改变、或结束时,执行回调方法。
设置手势识别器对象实例的相关属性(可选部分)
添加到需要识别的 View 中。每个手势只对应一个 View,当屏幕触摸在 View 的边界内时,如果手势和预定的一样,那就会执行回调方法。
PS:一个手势只能对应一个 View,但是一个 View 可以有多个手势。建议在真机上测试这些手势,模拟器操作不太方便,可能导致认为手势失效的情况。(模拟器测试捏合和旋转手势时,按住 option 键,再用触摸板或鼠标操作)
4、举例说明&
功能描述:
附加到两个图片视图 UIImageView 的有『拖动』、『捏合』、『旋转』、『点按』;
而『轻扫』和『自定义手势&KMGestureRecognizer』附加在根视图 UIView 中。
拖动:进行当前图片视图位置移动
捏合:进行当前图片视图缩放
旋转:进行当前图片视图角度旋转
点按:双击恢复当前图片视图的缩放、角度旋转、不透明度
长按:设置当前图片视图的不透明度为0.7
轻扫:左右轻扫设置两个图片视图为居中,同时以垂直居中的特定偏移量定位
自定义手势:挠痒功能,左右扫动共3次或以上,设置两个图片视图为居中,同时以水平居中的特定偏移量定位
效果如下:
KMGestureRecognizer.h
1 #import &UIKit/UIKit.h&
3 typedef NS_ENUM(NSUInteger, Direction) {
DirectionUnknown,
DirectionLeft,
DirectionRight
9 @interface KMGestureRecognizer : UIGestureRecognizer
10 @property (assign, nonatomic) NSUInteger tickleC //挠痒次数
11 @property (assign, nonatomic) CGPoint currentTickleS //当前挠痒开始坐标位置
12 @property (assign, nonatomic) Direction lastD //最后一次挠痒方向
KMGestureRecognizer.m
1 #import "KMGestureRecognizer.h"
2 #import &UIKit/UIGestureRecognizerSubclass.h&
4 @implementation KMGestureRecognizer
5 #define kMinTickleSpacing 20.0
6 #define kMaxTickleCount 3
8 - (void)reset {
_tickleCount = 0;
_currentTickleStart = CGPointZ
_lastDirection = DirectionU
if (self.state == UIGestureRecognizerStatePossible) {
self.state = UIGestureRecognizerStateF
18 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
_currentTickleStart = [touch locationInView:self.view]; //设置当前挠痒开始坐标位置
23 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
//『当前挠痒开始坐标位置』和『移动后坐标位置』进行 X 轴值比较,得到是向左还是向右移动
UITouch *touch = [touches anyObject];
CGPoint tickleEnd = [touch locationInView:self.view];
CGFloat tickleSpacing = tickleEnd.x - _currentTickleStart.x;
Direction currentDirection = tickleSpacing & 0 ? DirectionLeft : DirectionR
//移动的 X 轴间距值是否符合要求,足够大
if (ABS(tickleSpacing) &= kMinTickleSpacing) {
//判断是否有三次不同方向的动作,如果有则手势结束,将执行回调方法
if (_lastDirection == DirectionUnknown ||
(_lastDirection == DirectionLeft && currentDirection == DirectionRight) ||
(_lastDirection == DirectionRight && currentDirection == DirectionLeft)) {
_tickleCount++;
_currentTickleStart = tickleE
_lastDirection = currentD
if (_tickleCount &= kMaxTickleCount && self.state == UIGestureRecognizerStatePossible) {
self.state = UIGestureRecognizerStateE
//NSLog(@"自定义手势成功,将执行回调方法");
48 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self reset];
52 - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
[self reset];
ViewController.h
1 #import &UIKit/UIKit.h&
2 #import "KMGestureRecognizer.h"
4 @interface ViewController : UIViewController
5 @property (strong, nonatomic) UIImageView *imgV;
6 @property (strong, nonatomic) UIImageView *imgV2;
7 @property (strong, nonatomic) KMGestureRecognizer *customGestureR
ViewController.m
1 #import "ViewController.h"
3 @interface ViewController ()
4 - (void)handlePan:(UIPanGestureRecognizer *)
5 - (void)handlePinch:(UIPinchGestureRecognizer *)
6 - (void)handleRotation:(UIRotationGestureRecognizer *)
7 - (void)handleTap:(UITapGestureRecognizer *)
8 - (void)handleLongPress:(UILongPressGestureRecognizer *)
9 - (void)handleSwipe:(UISwipeGestureRecognizer *)
10 - (void)handleCustomGestureRecognizer:(KMGestureRecognizer *)
12 - (void)bindPan:(UIImageView *)imgVC
13 - (void)bindPinch:(UIImageView *)imgVC
14 - (void)bindRotation:(UIImageView *)imgVC
15 - (void)bindTap:(UIImageView *)imgVC
16 - (void)bindLongPress:(UIImageView *)imgVC
17 - (void)bindS
18 - (void)bingCustomGestureR
19 - (void)layoutUI;
22 @implementation ViewController
24 - (void)viewDidLoad {
[super viewDidLoad];
[self layoutUI];
30 - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
35 #pragma mark - 处理手势操作
处理拖动手势
@param recognizer 拖动手势识别器对象实例
41 - (void)handlePan:(UIPanGestureRecognizer *)recognizer {
//视图前置操作
[recognizer.view.superview bringSubviewToFront:recognizer.view];
CGPoint center = recognizer.view.
CGFloat cornerRadius = recognizer.view.frame.size.width / 2;
CGPoint translation = [recognizer translationInView:self.view];
//NSLog(@"%@", NSStringFromCGPoint(translation));
recognizer.view.center = CGPointMake(center.x + translation.x, center.y + translation.y);
[recognizer setTranslation:CGPointZero inView:self.view];
if (recognizer.state == UIGestureRecognizerStateEnded) {
//计算速度向量的长度,当他小于200时,滑行会很短
CGPoint velocity = [recognizer velocityInView:self.view];
CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
CGFloat slideMult = magnitude / 200;
//NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); //e.g. 397.973175, slideMult: 1.989866
//基于速度和速度因素计算一个终点
float slideFactor = 0.1 * slideM
CGPoint finalPoint = CGPointMake(center.x + (velocity.x * slideFactor),
center.y + (velocity.y * slideFactor));
//限制最小[cornerRadius]和最大边界值[self.view.bounds.size.width - cornerRadius],以免拖动出屏幕界限
finalPoint.x = MIN(MAX(finalPoint.x, cornerRadius),
self.view.bounds.size.width - cornerRadius);
finalPoint.y = MIN(MAX(finalPoint.y, cornerRadius),
self.view.bounds.size.height - cornerRadius);
//使用 UIView 动画使 view 滑行到终点
[UIView animateWithDuration:slideFactor*2
options:UIViewAnimationOptionCurveEaseOut
animations:^{
recognizer.view.center = finalP
completion:nil];
处理捏合手势
@param recognizer 捏合手势识别器对象实例
85 - (void)handlePinch:(UIPinchGestureRecognizer *)recognizer {
CGFloat scale = recognizer.
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, scale, scale); //在已缩放大小基础下进行累加变化;区别于:使用 CGAffineTransformMakeScale 方法就是在原大小基础下进行变化
recognizer.scale = 1.0;
处理旋转手势
@param recognizer 旋转手势识别器对象实例
96 - (void)handleRotation:(UIRotationGestureRecognizer *)recognizer {
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
recognizer.rotation = 0.0;
处理点按手势
@param recognizer 点按手势识别器对象实例
106 - (void)handleTap:(UITapGestureRecognizer *)recognizer {
UIView *view = recognizer.
view.transform = CGAffineTransformMakeScale(1.0, 1.0);
view.transform = CGAffineTransformMakeRotation(0.0);
view.alpha = 1.0;
处理长按手势
@param recognizer 点按手势识别器对象实例
118 - (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer {
//长按的时候,设置不透明度为0.7
recognizer.view.alpha = 0.7;
处理轻扫手势
@param recognizer 轻扫手势识别器对象实例
128 - (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer {
//代码块方式封装操作方法
void (^positionOperation)() = ^() {
CGPoint newPoint = recognizer.view.
newPoint.y -= 20.0;
_imgV.center = newP
newPoint.y += 40.0;
_imgV2.center = newP
//根据轻扫方向,进行不同控制
switch (recognizer.direction) {
case UISwipeGestureRecognizerDirectionRight: {
positionOperation();
case UISwipeGestureRecognizerDirectionLeft: {
positionOperation();
case UISwipeGestureRecognizerDirectionUp: {
case UISwipeGestureRecognizerDirectionDown: {
处理自定义手势
@param recognizer 自定义手势识别器对象实例
163 - (void)handleCustomGestureRecognizer:(KMGestureRecognizer *)recognizer {
//代码块方式封装操作方法
void (^positionOperation)() = ^() {
CGPoint newPoint = recognizer.view.
newPoint.x -= 20.0;
_imgV.center = newP
newPoint.x += 40.0;
_imgV2.center = newP
positionOperation();
178 #pragma mark - 绑定手势操作
绑定拖动手势
@param imgVCustom 绑定到图片视图对象实例
184 - (void)bindPan:(UIImageView *)imgVCustom {
UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
action:@selector(handlePan:)];
[imgVCustom addGestureRecognizer:recognizer];
绑定捏合手势
@param imgVCustom 绑定到图片视图对象实例
195 - (void)bindPinch:(UIImageView *)imgVCustom {
UIPinchGestureRecognizer *recognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self
action:@selector(handlePinch:)];
[imgVCustom addGestureRecognizer:recognizer];
//[recognizer requireGestureRecognizerToFail:imgVCustom.gestureRecognizers.firstObject];
绑定旋转手势
@param imgVCustom 绑定到图片视图对象实例
207 - (void)bindRotation:(UIImageView *)imgVCustom {
UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self
action:@selector(handleRotation:)];
[imgVCustom addGestureRecognizer:recognizer];
绑定点按手势
@param imgVCustom 绑定到图片视图对象实例
218 - (void)bindTap:(UIImageView *)imgVCustom {
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(handleTap:)];
//使用一根手指双击时,才触发点按手势识别器
recognizer.numberOfTapsRequired = 2;
recognizer.numberOfTouchesRequired = 1;
[imgVCustom addGestureRecognizer:recognizer];
绑定长按手势
@param imgVCustom 绑定到图片视图对象实例
232 - (void)bindLongPress:(UIImageView *)imgVCustom {
UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
recognizer.minimumPressDuration = 0.5; //设置最小长按时间;默认为0.5秒
[imgVCustom addGestureRecognizer:recognizer];
绑定轻扫手势;支持四个方向的轻扫,但是不同的方向要分别定义轻扫手势
241 - (void)bindSwipe {
//向右轻扫手势
UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSwipe:)];
recognizer.direction = UISwipeGestureRecognizerDirectionR //设置轻扫方向;默认是 UISwipeGestureRecognizerDirectionRight,即向右轻扫
[self.view addGestureRecognizer:recognizer];
[recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //设置以自定义挠痒手势优先识别
//向左轻扫手势
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(handleSwipe:)];
recognizer.direction = UISwipeGestureRecognizerDirectionL
[self.view addGestureRecognizer:recognizer];
[recognizer requireGestureRecognizerToFail:_customGestureRecognizer]; //设置以自定义挠痒手势优先识别
绑定自定义挠痒手势;判断是否有三次不同方向的动作,如果有则手势结束,将执行回调方法
260 - (void)bingCustomGestureRecognizer {
//当 recognizer.state 为 UIGestureRecognizerStateEnded 时,才执行回调方法 handleCustomGestureRecognizer:
//_customGestureRecognizer = [KMGestureRecognizer new];
_customGestureRecognizer = [[KMGestureRecognizer alloc] initWithTarget:self
action:@selector(handleCustomGestureRecognizer:)];
[self.view addGestureRecognizer:_customGestureRecognizer];
269 - (void)layoutUI {
//图片视图 _imgV
UIImage *img = [UIImage imageNamed:@"Emoticon_tusiji_icon"];
CGFloat cornerRadius = img.size.
_imgV = [[UIImageView alloc] initWithImage:img];
_imgV.frame = CGRectMake(20.0, 20.0,
cornerRadius * 2, cornerRadius * 2);
_imgV.userInteractionEnabled = YES;
_imgV.layer.masksToBounds = YES;
_imgV.layer.cornerRadius = cornerR
_imgV.layer.borderWidth = 2.0;
_imgV.layer.borderColor = [UIColor grayColor].CGC
[self.view addSubview:_imgV];
//图片视图 _imgV2
img = [UIImage imageNamed:@"Emoticon_tusiji_icon2"];
cornerRadius = img.size.
_imgV2 = [[UIImageView alloc] initWithImage:img];
_imgV2.frame = CGRectMake(20.0, 40.0 + _imgV.frame.size.height,
cornerRadius * 2, cornerRadius * 2);
_imgV2.userInteractionEnabled = YES;
_imgV2.layer.masksToBounds = YES;
_imgV2.layer.cornerRadius = cornerR
_imgV2.layer.borderWidth = 2.0;
_imgV2.layer.borderColor = [UIColor orangeColor].CGC
[self.view addSubview:_imgV2];
[self bindPan:_imgV];
[self bindPinch:_imgV];
[self bindRotation:_imgV];
[self bindTap:_imgV];
[self bindLongPress:_imgV];
[self bindPan:_imgV2];
[self bindPinch:_imgV2];
[self bindRotation:_imgV2];
[self bindTap:_imgV2];
[self bindLongPress:_imgV2];
//为了处理手势识别优先级的问题,这里需先绑定自定义挠痒手势
[self bingCustomGestureRecognizer];
[self bindSwipe];
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