[iOS UI进阶 - 5.0] 手势解锁Demo

http://ju.outofmemory.cn/entry/110001

A.需求

1.九宫格手势解锁

2.使用了绘图和手势事件

code source: https://github.com/hellovoidworld/GestureUnlockDemo




B.实现

使用按钮来处理每个圆点

使用代码生成按钮

取消按钮点击事件

设置普通状态和选中状态的背景图片

CGRectContainsPoint，移动到按钮范围内改变按钮为选中状态

按钮的连接：使用数组存储被选中的所有按钮，画上连线

已经连线的按钮不需要再连线

触摸结束清空连线和按钮选中状态

移动中也要画出线，最后的点用来辅助画移动中的线

解决bug：每次触摸开始重置当前画笔位置

设置触摸触发选中的按钮内部范围

使用tag记录按钮的选中顺序轨迹，触摸结束取得轨迹

封装整个手势解锁view成为一个自定义控件

封装按钮称为自定类

1.准备基础界面，使用一个UIView作为解锁画面





2.在控制器ViewController设置一下背景图片和状态栏

1 //
2 //  ViewController.m
3 //  HVWLockView
4 //
5 //  Created by hellovoidworld on 15/1/12.
6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
7 //
8
9 #import "ViewController.h"
10
11 @interface ViewController ()
12
13 @end
14
15 @implementation ViewController
16
17 - (void)viewDidLoad {
18     [super viewDidLoad];
19     // Do any additional setup after loading the view, typically from a nib.
20
21     // 设置背景
22     self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Home_refresh_bg"]];
23 }
24
25 /** 设置状态栏样式 */
26 - (UIStatusBarStyle)preferredStatusBarStyle {
27     return UIStatusBarStyleLightContent;
28 }
29
30 - (void)didReceiveMemoryWarning {
31     [super didReceiveMemoryWarning];
32     // Dispose of any resources that can be recreated.
33 }
34
35
36 @end

3.自定义解锁画面的类HVWLockView

4.使用代码初始化HVWLockView的子控件—按钮，设置按钮的样式、位置尺寸

1 //
2 //  HVWLockView.m
3 //  HVWLockView
4 //
5 //  Created by hellovoidworld on 15/1/12.
6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
7 //
8
9 #import "HVWLockView.h"
10 #import "HVWLockButton.h"
11
12 #define BUTTON_COUNT 9
13 #define BUTTON_COL_COUNT 3
14
15 @implementation HVWLockView
16
17 #pragma mark - 初始化方法
18 /** 使用文件初始化 */
19 - (id)initWithCoder:(NSCoder *)aDecoder {
20     if (self = [super initWithCoder:aDecoder]) {
21         [self initView];
22     }
23     return self;
24 }
25
26 /** 使用代码初始化 */
27 - (instancetype)initWithFrame:(CGRect)frame {
28     if (self = [super initWithFrame:frame]) {
29         [self initView];
30     }
31     return self;
32 }
33
34 /** 初始化view内的控件(按钮) */
35 - (void) initView {
36     for (int i=0; i<BUTTON_COUNT; i++) {
37         HVWLockButton *button = [HVWLockButton buttonWithType:UIButtonTypeCustom];
38
39         // 取消点击时间
40         button.userInteractionEnabled = NO;
41
42         // 设置指标tag，用来记录轨迹
43         button.tag = i;
44
45         // 设置普通状态图片
46         [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
47
48         // 设置选中状态图片
49         [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
50
51         // 加入按钮到lock view
52         [self addSubview:button];
53     }
54 }
55
56 /** 设置按钮位置尺寸 */
57 - (void)layoutSubviews {
58     [super layoutSubviews];
59
60     // 取出所有按钮
61     for (int i=0; i<self.subviews.count; i++) {
62         HVWLockButton *button = self.subviews[i];
63         CGFloat buttonWidth = 74;
64         CGFloat buttonHeight = 74;
65
66         // 此按钮所在列号
67         int col = i % BUTTON_COL_COUNT;
68         // 此按钮所在行号
69         int row = i / BUTTON_COL_COUNT;
70         // 等分水平多余空间，计算出间隙
71         CGFloat marginX = (self.frame.size.width - BUTTON_COL_COUNT * buttonWidth) / (BUTTON_COL_COUNT + 1);
72         CGFloat marginY = marginX;
73
74         // x坐标
75         CGFloat buttonX = marginX + col * (buttonWidth + marginX);
76         // y坐标
77         CGFloat buttonY = marginY + row * (buttonHeight + marginY);
78
79         button.frame = CGRectMake(buttonX, buttonY, buttonWidth, buttonHeight);
80     }
81 }
82
83 @end

out:





5.实现触摸事件方法

（1）点击开始，使被点击的按钮改变为选中状态（改变图片）

（2）点击拖曳中，同样使被触碰到的按钮改变为选中状态

（3）点击结束，清空选中状态

（4）小修改：把HVWLockView背景改为透明

HVWLockView：

1 #pragma mark - 触摸事件
2 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
3     UITouch *touch = [touches anyObject];
4     CGPoint touchLocation = [touch locationInView:touch.view];
5
6     // 检测哪个按钮被点中了
7     for (HVWLockButton *button in self.subviews) {
8         if (CGRectContainsPoint(button.frame, touchLocation)) {
9             button.selected = YES;
10         }
11     }
12
13 }
14
15 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
16     UITouch *touch = [touches anyObject];
17     CGPoint touchLocation = [touch locationInView:touch.view];
18
19     // 检测哪个按钮被点中了
20     for (HVWLockButton *button in self.subviews) {
21         if (CGRectContainsPoint(button.frame, touchLocation)) {
22             button.selected = YES;
23         }
24     }
25 }
26
27 - (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
28     // 消除所有按钮选中状态
29     for (HVWLockButton *button in self.subviews) {
30         button.selected = NO;
31     }
32 }

out:





6.画出连接线

（1）优化：将按钮封装为一个类HVWLockButton

1 //
2 //  HVWLockButton.m
3 //  HVWLockView
4 //
5 //  Created by hellovoidworld on 15/1/12.
6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
7 //
8
9 #import "HVWLockButton.h"
10
11 @implementation HVWLockButton
12
13 /** 使用文件创建会调用 */
14 - (id)initWithCoder:(NSCoder *)aDecoder {
15     if (self = [super initWithCoder:aDecoder]) {
16         [self initLockButton];
17     }
18     return self;
19 }
20
21 /** 使用代码创建会调用 */
22 - (instancetype)initWithFrame:(CGRect)frame {
23     if (self = [super initWithFrame:frame]) {
24         [self initLockButton];
25     }
26     return self;
27 }
28
29 /** 初始化 */
30 - (void) initLockButton {
31     // 取消交互事件（点击）
32     self.userInteractionEnabled = NO;
33
34     // 设置普通状态图片
35     [self setBackgroundImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
36
37     // 设置选中状态图片
38     [self setBackgroundImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
39 }
40
41 @end

（2）使用一个数组来存储已经被选择的按钮

（3）把触碰到的按钮到加入到上述数组中

（4）在绘图方法中把数组内的按钮用线连起来

（5）使用一个成员变量来存储当前触摸位置，画出最后触摸的按钮到现触摸点的线

（6）重复触碰同一个按钮的时候，不用重绘和计算

（7）创建一个代理方法，在触摸结束的时候输出轨迹序列

（8）精简一下代码

1 //
2 //  HVWLockView.m
3 //  HVWLockView
4 //
5 //  Created by hellovoidworld on 15/1/12.
6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
7 //
8
9 #import "HVWLockView.h"
10 #import "HVWLockButton.h"
11
12 #define BUTTON_COUNT 9
13 #define BUTTON_COL_COUNT 3
14
15 @interface HVWLockView()
16
17 /** 已选择按钮数组 */
18 @property(nonatomic, strong) NSMutableArray *selectedButtons;
19
20 /** 触摸位置 */
21 @property(nonatomic, assign) CGPoint currentTouchLocation;
22
23 @end
24
25 @implementation HVWLockView
26
27 /** 初始化数组 */
28 - (NSMutableArray *)selectedButtons {
29     if (nil == _selectedButtons) {
30         _selectedButtons = [NSMutableArray array];
31     }
32     return _selectedButtons;
33 }
34
35 #pragma mark - 初始化方法
36 /** 使用文件初始化 */
37 - (id)initWithCoder:(NSCoder *)aDecoder {
38     if (self = [super initWithCoder:aDecoder]) {
39         [self initView];
40     }
41     return self;
42 }
43
44 /** 使用代码初始化 */
45 - (instancetype)initWithFrame:(CGRect)frame {
46     if (self = [super initWithFrame:frame]) {
47         [self initView];
48     }
49     return self;
50 }
51
52 /** 初始化view内的控件(按钮) */
53 - (void) initView {
54     // 设置透明背景
55     self.backgroundColor = [[UIColor alloc] initWithRed:1 green:1 blue:1 alpha:0];
56
57     for (int i=0; i<BUTTON_COUNT; i++) {
58         HVWLockButton *button = [HVWLockButton buttonWithType:UIButtonTypeCustom];
59
60         // 设置指标tag，用来记录轨迹
61         button.tag = i;
62
63         // 加入按钮到lock view
64         [self addSubview:button];
65     }
66 }
67
68 /** 设置按钮位置尺寸 */
69 - (void)layoutSubviews {
70     [super layoutSubviews];
71
72     // 取出所有按钮
73     for (int i=0; i<self.subviews.count; i++) {
74         HVWLockButton *button = self.subviews[i];
75         CGFloat buttonWidth = 74;
76         CGFloat buttonHeight = 74;
77
78         // 此按钮所在列号
79         int col = i % BUTTON_COL_COUNT;
80         // 此按钮所在行号
81         int row = i / BUTTON_COL_COUNT;
82         // 等分水平多余空间，计算出间隙
83         CGFloat marginX = (self.frame.size.width - BUTTON_COL_COUNT * buttonWidth) / (BUTTON_COL_COUNT + 1);
84         CGFloat marginY = marginX;
85
86         // x坐标
87         CGFloat buttonX = marginX + col * (buttonWidth + marginX);
88         // y坐标
89         CGFloat buttonY = marginY + row * (buttonHeight + marginY);
90
91         button.frame = CGRectMake(buttonX, buttonY, buttonWidth, buttonHeight);
92     }
93 }
94
95 #pragma mark - 触摸事件
96 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
97
98     [self touchesMoved:touches withEvent:event];
99
100 }
101
102 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
103     UITouch *touch = [touches anyObject];
104     CGPoint touchLocation = [touch locationInView:touch.view];
105
106     // 检测哪个按钮被点中了
107     for (HVWLockButton *button in self.subviews) {
108
109         // 如果触碰到了此按钮
110         if (CGRectContainsPoint(button.touchFrame, touchLocation)) {
111             button.selected = YES;
112
113             // 如果此按钮没有被触碰过才进行处理
114             if (![self.selectedButtons containsObject:button]) {
115                 // 加入到数组
116                 [self.selectedButtons addObject:button];
117             }
118         }
119
120         // 当前触摸位置
121         self.currentTouchLocation = touchLocation;
122     }
123
124     // 重绘
125     [self setNeedsDisplay];
126 }
127
128 - (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
129     // 轨迹序列
130     NSMutableString *passPath = [NSMutableString string];
131
132     // 合成轨迹序列
133     for (HVWLockButton *button in self.selectedButtons) {
134         // 添加到轨迹序列
135         [passPath appendFormat:@"%d", button.tag];
136     }
137
138     // 调用代理方法
139     if ([self.delegate respondsToSelector:@selector(hvwLockView:didFinishedWithPath:)]) {
140         [self.delegate hvwLockView:self didFinishedWithPath:passPath];
141     }
142
143     // 清除选中状态
144     [self.selectedButtons makeObjectsPerformSelector:@selector(setSelected:) withObject:@(NO)];
145
146     // 清空数组
147     [self.selectedButtons removeAllObjects];
148
149     // 重绘
150     [self setNeedsDisplay];
151 }
152
153
154 #pragma mark - 绘图方法
155 - (void)drawRect:(CGRect)rect {
156     UIBezierPath *path = [UIBezierPath bezierPath];
157
158     // 遍历已选择按钮数组
159     for (int i=0; i<self.selectedButtons.count; i++) {
160            HVWLockButton *button = self.selectedButtons[i];
161
162         if (0 == i) {
163             [path moveToPoint:button.center];
164         } else {
165             [path addLineToPoint:button.center];
166         }
167     }
168
169     if (self.selectedButtons.count) {
170         [path addLineToPoint:self.currentTouchLocation];
171     }
172
173     // 设置画笔
174     [[UIColor redColor] set];
175     [path setLineWidth:10];
176     [path setLineCapStyle:kCGLineCapRound];
177     [path setLineJoinStyle:kCGLineJoinBevel];
178
179     [path stroke];
180 }
181
182 @end

out:





2015-01-12 16:39:23.794 HVWLockView[10274:184387] 手势解锁的输出序列：01246