[iOS UI进阶 - 5.0] 手势解锁Demo

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

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