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手勢密碼實現

手勢密碼 一般常常用於金融項目，做的是安全相關的業務。具體實現如下思路，我把它分為view層和邏輯層。我將數據層合並到view層中了，最好是加上數據層用於處理加密的密碼和密碼的存儲

view層

view層主要處理，包括（九個按鈕）touchesBegan,touchesMoved,touchesEnded，點與點之間畫線，手指滑動畫線，畫線主要是在drawRect中重繪，提到這裡必須不能忘記setNeedsDisplay這個方法。還要記錄經過的按鈕btnsArray（存放按鈕的數組），這個 可以和相關的具體值做映射，也可以直接設置btn 的tag,還要添加完成繪畫的回調。提供給邏輯層去處理。

邏輯層

用於處理完成交互後的業務，包括（請求接口，異常邏輯顯示，等等）
具體的demo點這裡

具體的code：
view.h

//
// YHGesturePasswordView.h
// 手勢密碼
//
// Created by mrlee on 2017/3/5.
// Copyright © 2017年 mrlee. All rights reserved.
//
typedef enum {
  GestureSetPassword, //設置手勢密碼
  GestureResultPassword //已有手勢密碼教驗
} PasswordState;
//設置密碼的3種狀態
typedef enum {
  FristPwd, //第一次設置密碼
  PwdNoValue, //二次設置密碼不一致
  SetPwdSuccess, //設置密碼成功
  Other
}SetPwdState;

#import <UIKit/UIKit.h>

@interface YHGesturePasswordView : UIView
/** btn圖片*/
@property (nonatomic,strong)UIImage *btnImage;

///選中的圖片
@property (nonatomic,strong)UIImage *btnSelectImage;

///劃線顏色
@property (nonatomic,strong)UIColor *lineColor;

/** 解鎖手勢完成之後判斷結果時調用的block */
@property (nonatomic,copy)BOOL (^sendReaultData)(NSString *str);

//設置手勢密碼
@property(nonatomic,copy)void(^setPwdBlock)(SetPwdState pwdState);


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

@end

view.m

//
// YHGesturePasswordView.m
// 手勢密碼
//
// 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(){
  /** 判斷是當設置密碼用，還是解鎖密碼用*/
  PasswordState Amode;
}
/** 所有的按鈕集合*/
@property (nonatomic,strong)NSMutableArray * allBtnsArray;

/** 解鎖時手指經過的所有的btn集合*/
@property (nonatomic,strong)NSMutableArray * btnsArray;

/** 手指當前的觸摸位置*/
@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{
  // 每次調用這個方法的時候如果背景顏色是default會產生緩存，如果設置了顏色之後就沒有緩存，繪制之前需要清除緩存
  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{
      CGContextAddL.netoPoint(ctx, btn.center.x, btn.center.y);
    }
  }
  if (!CGPointEqualToPoint(self.currentPoint, CGPointZero)) {//如果起點不是CGPointZero的話才來劃線
    CGContextAddL.netoPoint(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 繪制九宮格
  [self drawUi];


}
#pragma mark Private method
-(void)drawUi{
  for (int index = 0; index<self.allBtnsArray.count; index ++) {
    //拿到每個btn
    UIButton *btn = self.subviews[index];

    //設置frame
    CGFloat btnW = 74;
    CGFloat btnH = 74;
    CGFloat margin = (SCREEN_WIDTH - (btnW *3))/4;
    //x = 間距 + 列號*（間距+btnW）
    CGFloat btnX = margin + (index % 3)*(margin + btnW);
    CGFloat btnY = margin + (index / 3)*(margin + btnH);

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

}
//設置密碼
-(SetPwdState)pwdValue:(NSString *)str{
  if ([[NSUserDefaults standardUserDefaults] objectForKey:@"pwdValue"] == nil) {
    //第一次設置
    [[NSUserDefaults standardUserDefaults] setValue:str forKey:@"pwdValue"];
    return FristPwd;
  }
  if ([str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {
    //設置成功
    return SetPwdSuccess;
  }
  if (![str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {
    //二次設置不一樣
    return PwdNoValue;
  }

  return Other;

}
//清空
-(void)clear{
  [self.btnsArray removeAllObjects];
  self.currentPoint = CGPointZero;
  [self setNeedsDisplay];
  self.lineColor = [UIColor greenColor];
  self.userInteractionEnabled = YES;
}
//獲取觸摸的點
-(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:{
      //設置手勢密碼
      self.setPwdBlock([self pwdValue:result]);
    }
      break;
    case GestureResultPassword :{
      //獲取手勢密碼結果
      if (self.sendReaultData) {
        if (self.sendReaultData(result) == YES) {
           NSLog(@"success");
          [self clear];
        }else{
          NSLog(@"手勢有誤");
        }

      }

    }
      break;

    default:
      break;
  }
  //返回結果
  [self clear];
}
#pragma mark 延時加載
-(NSMutableArray *)btnsArray{
  if (_btnsArray == nil) {
    _btnsArray = [NSMutableArray array];
  }
  return _btnsArray;
}
-(NSMutableArray *)allBtnsArray{
  if (_allBtnsArray == nil) {
    _allBtnsArray = [NSMutableArray array];
  }
  return _allBtnsArray;
}

@end

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[db:作者簡介][db:原文翻譯及解析]

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