[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

 

 

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

//
//  ViewController.m
//  HVWLockView
//
//  Created by hellovoidworld on 15/1/12.
//  Copyright (c) 2015年 hellovoidworld. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   
    // 设置背景
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Home_refresh_bg"]];
}

/** 设置状态栏样式 */
- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@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

//
//  HVWLockView.m
//  HVWLockView
//
//  Created by hellovoidworld on 15/1/12.
//  Copyright (c) 2015年 hellovoidworld. All rights reserved.
//

#import "HVWLockView.h"
#import "HVWLockButton.h"

#define BUTTON_COUNT 9
#define BUTTON_COL_COUNT 3

@implementation HVWLockView

#pragma mark - 初始化方法
/** 使用文件初始化 */
- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self initView];
    }
    return self;
}

/** 使用代码初始化 */
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self initView];
    }
    return self;
}

/** 初始化view内的控件(按钮) */
- (void) initView {
    for (int i=0; i<BUTTON_COUNT; i++) {
        HVWLockButton *button = [HVWLockButton buttonWithType:UIButtonTypeCustom];
       
        // 取消点击时间
        button.userInteractionEnabled = NO;
       
        // 设置指标tag，用来记录轨迹
        button.tag = i;
       
        // 设置普通状态图片
        [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
       
        // 设置选中状态图片
        [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
       
        // 加入按钮到lock view
        [self addSubview:button];
    }
}

/** 设置按钮位置尺寸 */
- (void)layoutSubviews {
    [super layoutSubviews];
   
    // 取出所有按钮
    for (int i=0; i<self.subviews.count; i++) {
        HVWLockButton *button = self.subviews[i];
        CGFloat buttonWidth = 74;
        CGFloat buttonHeight = 74;

        // 此按钮所在列号
        int col = i % BUTTON_COL_COUNT;
        // 此按钮所在行号
        int row = i / BUTTON_COL_COUNT;
        // 等分水平多余空间，计算出间隙
        CGFloat marginX = (self.frame.size.width - BUTTON_COL_COUNT * buttonWidth) / (BUTTON_COL_COUNT + 1);
        CGFloat marginY = marginX;
       
        // x坐标
        CGFloat buttonX = marginX + col * (buttonWidth + marginX);
        // y坐标
        CGFloat buttonY = marginY + row * (buttonHeight + marginY);
       
        button.frame = CGRectMake(buttonX, buttonY, buttonWidth, buttonHeight);
    }
}

@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：

#pragma mark - 触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInView:touch.view];
   
    // 检测哪个按钮被点中了
    for (HVWLockButton *button in self.subviews) {
        if (CGRectContainsPoint(button.frame, touchLocation)) {
            button.selected = YES;
        }
    }

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInView:touch.view];
   
    // 检测哪个按钮被点中了
    for (HVWLockButton *button in self.subviews) {
        if (CGRectContainsPoint(button.frame, touchLocation)) {
            button.selected = YES;
        }
    }
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    // 消除所有按钮选中状态
    for (HVWLockButton *button in self.subviews) {
        button.selected = NO;
    }
}

 

out:

 

6.画出连接线

（1）优化：将按钮封装为一个类HVWLockButton

//
//  HVWLockButton.m
//  HVWLockView
//
//  Created by hellovoidworld on 15/1/12.
//  Copyright (c) 2015年 hellovoidworld. All rights reserved.
//

#import "HVWLockButton.h"

@implementation HVWLockButton

/** 使用文件创建会调用 */
- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self initLockButton];
    }
    return self;
}

/** 使用代码创建会调用 */
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self initLockButton];
    }
    return self;
}

/** 初始化 */
- (void) initLockButton {
    // 取消交互事件（点击）
    self.userInteractionEnabled = NO;
   
    // 设置普通状态图片
    [self setBackgroundImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
   
    // 设置选中状态图片
    [self setBackgroundImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
}

@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

 

//
//  HVWLockView.m
//  HVWLockView
//
//  Created by hellovoidworld on 15/1/12.
//  Copyright (c) 2015年 hellovoidworld. All rights reserved.
//

#import "HVWLockView.h"
#import "HVWLockButton.h"

#define BUTTON_COUNT 9
#define BUTTON_COL_COUNT 3

@interface HVWLockView()

/** 已选择按钮数组 */
@property(nonatomic, strong) NSMutableArray *selectedButtons;

/** 触摸位置 */
@property(nonatomic, assign) CGPoint currentTouchLocation;

@end

@implementation HVWLockView

/** 初始化数组 */
- (NSMutableArray *)selectedButtons {
    if (nil == _selectedButtons) {
        _selectedButtons = [NSMutableArray array];
    }
    return _selectedButtons;
}

#pragma mark - 初始化方法
/** 使用文件初始化 */
- (id)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self initView];
    }
    return self;
}

/** 使用代码初始化 */
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self initView];
    }
    return self;
}

/** 初始化view内的控件(按钮) */
- (void) initView {
    // 设置透明背景
    self.backgroundColor = [[UIColor alloc] initWithRed:1 green:1 blue:1 alpha:0];
   
    for (int i=0; i<BUTTON_COUNT; i++) {
        HVWLockButton *button = [HVWLockButton buttonWithType:UIButtonTypeCustom];
       
        // 设置指标tag，用来记录轨迹
        button.tag = i;
       
        // 加入按钮到lock view
        [self addSubview:button];
    }
}

/** 设置按钮位置尺寸 */
- (void)layoutSubviews {
    [super layoutSubviews];
   
    // 取出所有按钮
    for (int i=0; i<self.subviews.count; i++) {
        HVWLockButton *button = self.subviews[i];
        CGFloat buttonWidth = 74;
        CGFloat buttonHeight = 74;

        // 此按钮所在列号
        int col = i % BUTTON_COL_COUNT;
        // 此按钮所在行号
        int row = i / BUTTON_COL_COUNT;
        // 等分水平多余空间，计算出间隙
        CGFloat marginX = (self.frame.size.width - BUTTON_COL_COUNT * buttonWidth) / (BUTTON_COL_COUNT + 1);
        CGFloat marginY = marginX;
       
        // x坐标
        CGFloat buttonX = marginX + col * (buttonWidth + marginX);
        // y坐标
        CGFloat buttonY = marginY + row * (buttonHeight + marginY);
       
        button.frame = CGRectMake(buttonX, buttonY, buttonWidth, buttonHeight);
    }
}

#pragma mark - 触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
   
    [self touchesMoved:touches withEvent:event];
   
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInView:touch.view];
   
    // 检测哪个按钮被点中了
    for (HVWLockButton *button in self.subviews) {
       
        // 如果触碰到了此按钮
        if (CGRectContainsPoint(button.touchFrame, touchLocation)) {
            button.selected = YES;
           
            // 如果此按钮没有被触碰过才进行处理
            if (![self.selectedButtons containsObject:button]) {
                // 加入到数组
                [self.selectedButtons addObject:button];
            }
        }
       
        // 当前触摸位置
        self.currentTouchLocation = touchLocation;
    }
   
    // 重绘
    [self setNeedsDisplay];
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    // 轨迹序列
    NSMutableString *passPath = [NSMutableString string];
   
    // 合成轨迹序列
    for (HVWLockButton *button in self.selectedButtons) {
        // 添加到轨迹序列
        [passPath appendFormat:@"%d", button.tag];
    }

    // 调用代理方法
    if ([self.delegate respondsToSelector:@selector(hvwLockView:didFinishedWithPath:)]) {
        [self.delegate hvwLockView:self didFinishedWithPath:passPath];
    }
   
    // 清除选中状态
    [self.selectedButtons makeObjectsPerformSelector:@selector(setSelected:) withObject:@(NO)];
   
    // 清空数组
    [self.selectedButtons removeAllObjects];
   
    // 重绘
    [self setNeedsDisplay];
}


#pragma mark - 绘图方法
- (void)drawRect:(CGRect)rect {
    UIBezierPath *path = [UIBezierPath bezierPath];
   
    // 遍历已选择按钮数组
    for (int i=0; i<self.selectedButtons.count; i++) {
           HVWLockButton *button = self.selectedButtons[i];
       
        if (0 == i) {
            [path moveToPoint:button.center];
        } else {
            [path addLineToPoint:button.center];
        }
    }
   
    if (self.selectedButtons.count) {
        [path addLineToPoint:self.currentTouchLocation];
    }
   
    // 设置画笔
    [[UIColor redColor] set];
    [path setLineWidth:10];
    [path setLineCapStyle:kCGLineCapRound];
    [path setLineJoinStyle:kCGLineJoinBevel];
   
    [path stroke];
}

@end

 

out:

 

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