iOS手勢密碼的實現(xiàn)方法

#define ScreenHeight [[UIScreen mainScreen] bounds].size.height
#define ScreenWidth [[UIScreen mainScreen] bounds].size.width

@property (nonatomic,strong)NSMutableArray *buttonArr;//全部手勢按鍵的數(shù)組
@property (nonatomic,strong)NSMutableArray *selectorArr;//選中手勢按鍵的數(shù)組
@property (nonatomic,assign)CGPoint startPoint;//記錄開始選中的按鍵坐標(biāo)
@property (nonatomic,assign)CGPoint endPoint;//記錄結(jié)束時的手勢坐標(biāo)
@property (nonatomic,strong)UIImageView *imageView;//畫圖所需

-(NSMutableArray *)selectorArr
{
  if (!_selectorArr) {
    _selectorArr = [[NSMutableArray alloc]init];
  }
  return _selectorArr;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor whiteColor];

  
  if (!_buttonArr) {
    _buttonArr = [[NSMutableArray alloc]initWithCapacity:9];
  }
  
  self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, ScreenWidth, ScreenHeight)];
  [self.view addSubview:self.imageView];

  for (int i=0; i<3; i++) {
    for (int j=0; j<3; j++) {
      UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
      btn.frame = CGRectMake(ScreenWidth/12+ScreenWidth/3*j, ScreenHeight/3+ScreenWidth/3*i, ScreenWidth/6, ScreenWidth/6);
      [btn setImage:[UIImage imageNamed:@"pbg"] forState:UIControlStateNormal];
      [btn setImage:[UIImage imageNamed:@"pbg01"] forState:UIControlStateHighlighted];
      btn.userInteractionEnabled = NO;
      [self.buttonArr addObject:btn];
      [self.imageView addSubview:btn];
    }
    
  }
}

-(UIImage *)drawLine{
  UIImage *image = nil;
  
  UIColor *col = [UIColor colorWithRed:1 green:0 blue:0 alpha:1];
  UIGraphicsBeginImageContext(self.imageView.frame.size);//設(shè)置畫圖的大小為imageview的大小
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextSetLineWidth(context, 5);
  CGContextSetStrokeColorWithColor(context, col.CGColor);
  
  CGContextMoveToPoint(context, self.startPoint.x, self.startPoint.y);//設(shè)置畫線起點

  //從起點畫線到選中的按鍵中心，并切換畫線的起點
  for (UIButton *btn in self.selectorArr) {
    CGPoint btnPo = btn.center;
    CGContextAddLineToPoint(context, btnPo.x, btnPo.y);
    CGContextMoveToPoint(context, btnPo.x, btnPo.y);
  }
  //畫移動中的最后一條線
  CGContextAddLineToPoint(context, self.endPoint.x, self.endPoint.y);
  
  CGContextStrokePath(context);
  
  image = UIGraphicsGetImageFromCurrentImageContext();//畫圖輸出
  UIGraphicsEndImageContext();//結(jié)束畫線
  return image;
}

//開始手勢
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [touches anyObject];//保存所有觸摸事件
  if (touch) {
    
    
    for (UIButton *btn in self.buttonArr) {
      
      CGPoint po = [touch locationInView:btn];//記錄按鍵坐標(biāo)
      
      if ([btn pointInside:po withEvent:nil]) {//判斷按鍵坐標(biāo)是否在手勢開始范圍內(nèi),是則為選中的開始按鍵
        
        [self.selectorArr addObject:btn];
        btn.highlighted = YES;
        self.startPoint = btn.center;//保存起始坐標(biāo)
      }
    
    }
    
  }
  
}

//移動中觸發(fā)，畫線過程中會一直調(diào)用畫線方法
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
  UITouch *touch = [touches anyObject];
  if (touch) {
    
    self.endPoint = [touch locationInView:self.imageView];
    for (UIButton *btn in self.buttonArr) {
      CGPoint po = [touch locationInView:btn];
      if ([btn pointInside:po withEvent:nil]) {
        
        BOOL isAdd = YES;//記錄是否為重復(fù)按鍵
        for (UIButton *seBtn in self.selectorArr) {
          if (seBtn == btn) {
            isAdd = NO;//已經(jīng)是選中過的按鍵，不再重復(fù)添加
            break;
          }
        }
        if (isAdd) {//未添加的選中按鍵，添加并修改狀態(tài)
          [self.selectorArr addObject:btn];
          btn.highlighted = YES;
        }
        
      }
    }
  }
  self.imageView.image = [self drawLine];//每次移動過程中都要調(diào)用這個方法，把畫出的圖輸出顯示
  
}
//手勢結(jié)束觸發(fā)
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
  self.imageView.image = nil;
  self.selectorArr = nil;
  for (UIButton *btn in self.buttonArr) {
    btn.highlighted = NO;
  }
}