• [iOS UI进阶


    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
     
    Image
     
    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
    Image(1)
     
    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:
    Image(2)
     
     
    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:
    Image(3)
     
    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:
    Image(4)
     
    2015-01-12 16:39:23.794 HVWLockView[10274:184387] 手势解锁的输出序列:01246
     
     
     
     
     
     
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  • 原文地址:https://www.cnblogs.com/hellovoidworld/p/4218754.html
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