认识达内从这里开始

    手势密码实现

    手势密码 一般常常用于金融项目,做的是安全相关的业务.具体实现如下思路,我把它分为view层和逻辑层.我将数据层合并到view层中了,最好是加上数据层用于处理加密的密码和密码的存储

    view层

    view层主要处理,包括(九个按钮)touchesBegan,touchesMoved,touchesEnded,点与点之间画线,手指滑动画线,画线主要是在drawRect中重绘,提到这里必须不能忘记setNeedsDisplay这个方法.还要记录经过的按钮btnsArray(存放按钮的数组),这个 可以和相关的具体值做映射,也可以直接设置btn 的tag,还要添加完成绘画的回调.提供给逻辑层去处理.

    逻辑层

    用于处理完成交互后的业务,包括(请求接口,异常逻辑显示,等等)

    具体的demo点这里

    具体的code:

    view.h

    //

    // YHGesturePasswordView.h

    // 手势密码

    //

    // Created by mrlee on 2017/3/5.

    // Copyright ? 2017年 mrlee. All rights reserved.

    //

    typedef enum {

    GestureSetPassword, //设置手势密码

    GestureResultPassword //已有手势密码教验

    } PasswordState;

    //设置密码的3种状态

    typedef enum {

    FristPwd, //第一次设置密码

    PwdNoValue, //二次设置密码不一致

    SetPwdSuccess, //设置密码成功

    Other

    }SetPwdState;

    #import <UIKit/UIKit.h>

    @interface YHGesturePasswordView : UIView

    /** btn图片*/

    @property (nonatomic,strong)UIImage *btnImage;

    ///选中的图片

    @property (nonatomic,strong)UIImage *btnSelectImage;

    ///划线颜色

    @property (nonatomic,strong)UIColor *lineColor;

    /** 解锁手势完成之后判断结果时调用的block */

    @property (nonatomic,copy)BOOL (^sendReaultData)(NSString *str);

    //设置手势密码

    @property(nonatomic,copy)void(^setPwdBlock)(SetPwdState pwdState);

    // init

    -(instancetype)initWithFrame:(CGRect)frame WithState:(PasswordState)state;

    @end

    复制代码

    view.m

    //

    // YHGesturePasswordView.m

    // 手势密码

    //

    // Created by mrlee on 2017/3/5.

    // Copyright ? 2017年 mrlee. All rights reserved.

    //

    #define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width

    #define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height

    #import "YHCustomButton.h"

    #import "YHGesturePasswordView.h"

    #import <CommonCrypto/CommonDigest.h>

    @interface YHGesturePasswordView(){

    /** 判断是当设置密码用,还是解锁密码用*/

    PasswordState Amode;

    }

    /** 所有的按钮集合*/

    @property (nonatomic,strong)NSMutableArray * allBtnsArray;

    /** 解锁时手指经过的所有的btn集合*/

    @property (nonatomic,strong)NSMutableArray * btnsArray;

    /** 手指当前的触摸位置*/

    @property (nonatomic,assign)CGPoint currentPoint;

    @end

    @implementation YHGesturePasswordView

    -(instancetype)initWithFrame:(CGRect)frame WithState:(PasswordState)state{

    self = [super initWithFrame:frame];

    if (self) {

    self.backgroundColor = [UIColor clearColor];

    Amode = state;

    for (int i = 0; i<9; i++) {

    YHCustomButton *btn = [[YHCustomButton alloc]init];

    [btn setTag:i];

    btn.userInteractionEnabled = NO;

    if (self.lineColor == nil) {

    self.lineColor = [UIColor greenColor];

    }

    [self addSubview:btn];

    }

    }

    return self;

    }

    -(void)drawRect:(CGRect)rect{

    // 每次调用这个方法的时候如果背景颜色是default会产生缓存,如果设置了颜色之后就没有缓存,绘制之前需要清除缓存

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextClearRect(ctx, rect);//清空上下文

    for (int i = 0; i<self.btnsArray.count; i++) {

    UIButton *btn = self.btnsArray[i];

    if (i == 0) {

    CGContextMoveToPoint(ctx, btn.center.x, btn.center.y);

    }else{

    CGContextAddLineToPoint(ctx, btn.center.x, btn.center.y);

    }

    }

    if (!CGPointEqualToPoint(self.currentPoint, CGPointZero)) {//如果起点不是CGPointZero的话才来划线

    CGContextAddLineToPoint(ctx, self.currentPoint.x, self.currentPoint.y);

    }

    CGContextSetLineWidth(ctx, 12);

    CGContextSetLineCap(ctx, kCGLineCapRound);

    CGContextSetLineJoin(ctx, kCGLineJoinRound);

    [self.lineColor set];

    CGContextStrokePath(ctx);

    }

    -(void)layoutSubviews{

    [self.allBtnsArray removeAllObjects];

    for (int index =0; index<self.subviews.count; index ++) {

    if ([self.subviews[index] isKindOfClass:[YHCustomButton class]]) {

    [self.allBtnsArray addObject:self.subviews[index]];

    }

    }

    // button 绘制九宫格

    [self drawUi];

    }

    #pragma mark Private method

    -(void)drawUi{

    for (int index = 0; index<self.allBtnsArray.count; index ++) {

    //拿到每个btn

    UIButton *btn = self.subviews[index];

    //设置frame

    CGFloat btnW = 74;

    CGFloat btnH = 74;

    CGFloat margin = (SCREEN_WIDTH - (btnW *3))/4;

    //x = 间距 + 列号*(间距+btnW)

    CGFloat btnX = margin + (index % 3)*(margin + btnW);

    CGFloat btnY = margin + (index / 3)*(margin + btnH);

    btn.frame = CGRectMake(btnX, btnY, btnW, btnH);

    }

    }

    //设置密码

    -(SetPwdState)pwdValue:(NSString *)str{

    if ([[NSUserDefaults standardUserDefaults] objectForKey:@"pwdValue"] == nil) {

    //第一次设置

    [[NSUserDefaults standardUserDefaults] setValue:str forKey:@"pwdValue"];

    return FristPwd;

    }

    if ([str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {

    //设置成功

    return SetPwdSuccess;

    }

    if (![str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {

    //二次设置不一样

    return PwdNoValue;

    }

    return Other;

    }

    //清空

    -(void)clear{

    [self.btnsArray removeAllObjects];

    self.currentPoint = CGPointZero;

    [self setNeedsDisplay];

    self.lineColor = [UIColor greenColor];

    self.userInteractionEnabled = YES;

    }

    //获取触摸的点

    -(CGPoint)getCurrentTouch:(NSSet<UITouch*> *)touches{

    UITouch *touch = [touches anyObject];

    CGPoint point = [touch locationInView:touch.view];

    return point;

    }

    -(UIButton *)getCurrentBtnWithPoint:(CGPoint) currentPoint{

    for (UIButton *btn in self.subviews) {

    if (CGRectContainsPoint(btn.frame, currentPoint)) {

    return btn;

    }

    }

    return nil;

    }

    -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    CGPoint point = [self getCurrentTouch:touches];

    UIButton *btn = [self getCurrentBtnWithPoint:point];

    if (btn && btn.selected != YES) {

    btn.selected = YES;

    [self.btnsArray addObject:btn];

    NSLog(@" array is value %@",self.btnsArray);

    }

    }

    -(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    CGPoint movePoint = [self getCurrentTouch:touches];

    UIButton *btn = [self getCurrentBtnWithPoint:movePoint];

    if (btn && btn.selected !=YES) {

    btn.selected = YES;

    [self.btnsArray addObject:btn];

    NSLog(@"btn is value %@",self.btnsArray);

    }

    self.currentPoint = movePoint;

    [self setNeedsDisplay];

    }

    -(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    for (UIButton *btn in self.btnsArray) {

    [btn setSelected:NO];

    }

    NSMutableString *result = [NSMutableString string];

    for (UIButton *btn in self.btnsArray) {

    [result appendString: [NSString stringWithFormat:@"%ld",(long)btn.tag]];

    }

    switch (Amode) {

    case GestureSetPassword:{

    //设置手势密码

    self.setPwdBlock([self pwdValue:result]);

    }

    break;

    case GestureResultPassword :{

    //获取手势密码结果

    if (self.sendReaultData) {

    if (self.sendReaultData(result) == YES) {

    NSLog(@"success");

    [self clear];

    }else{

    NSLog(@"手势有误");

    }

    }

    }

    break;

    default:

    break;

    }

    //返回结果

    [self clear];

    }

    #pragma mark 延时加载

    -(NSMutableArray *)btnsArray{

    if (_btnsArray == nil) {

    _btnsArray = [NSMutableArray array];

    }

    return _btnsArray;

    }

    -(NSMutableArray *)allBtnsArray{

    if (_allBtnsArray == nil) {

    _allBtnsArray = [NSMutableArray array];

    }

    return _allBtnsArray;

    }

    @end