//
// LockView.m
// 手勢解鎖
//
// Created by Daniel on 16/4/4.
// Copyright © 2016年 Daniel. All rights reserved.
//
 
 
#import "LockView.h"
 
@interface LockView ()
 
/** 保存已選中的按鈕 */
@property(nonatomic, strong) NSMutableArray *selectedBtn;
/** 當前觸摸點 */
@property(nonatomic, assign) CGPoint curp;
@end
 
@implementation LockView
 
- (NSMutableArray *)selectedBtn {
 if (_selectedBtn == nil) {
  _selectedBtn = [NSMutableArray array];
 }
 return _selectedBtn;
}
 
- (IBAction)pan:(UIPanGestureRecognizer *)pan {
  
 //獲取當前觸摸點
 _curp = [pan locationInView:self];
  
 //判斷觸摸點在不在按鈕上
 for (UIButton *btn in self.subviews) {
  //如果在按鈕上就設置選中狀態(tài)
   
  //觸摸點必須在button中心點30范圍內(nèi)才選中，更精確，體驗更好
  CGRect rect = CGRectMake(btn.center.x, btn.center.y, 30, 30);
   
  if (CGRectContainsPoint(rect, _curp) && btn.selected == NO) {
   btn.selected = YES;
    
   //將這個選中的按鈕保存起來
   [self.selectedBtn addObject:btn];
    
    
  }
 }
  
 //重繪，調(diào)用drawRect方法
 [self setNeedsDisplay];
  
 //手指抬起時
 if(pan.state == UIGestureRecognizerStateEnded) {
   
  NSMutableString *strM = [NSMutableString string];
   
  //如果當前觸摸點不在Button上，則手指抬起時，就顯示選中的Button以及連線
  UIButton *lastBtn = [self.selectedBtn lastObject];
   
  //把最后一個選中按鈕的中心點設置為當前觸摸點，清除最后多出來的一截連線
  _curp = lastBtn.center;
 
  for (UIButton *btn in self.selectedBtn) {
   //保存手勢密碼
   [strM appendFormat:@"%ld", btn.tag];
  }
   
  //strM就是密碼了
  NSLog(@"%@",strM);
   
  //TODO：對比之前保存的密碼，如果對了就直接跳轉(zhuǎn)界面了
   
  //NSLog(@"手指抬起");
  //這里了執(zhí)行完之后系統(tǒng)自動調(diào)用了重繪方法
   
  //等待2s后清除所有連線，清除Button的選中狀態(tài)
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
   //取消按鈕選中
   //[self.selectedBtn makeObjectsPerformSelector:@selector(setSelected:) withObject:NO];這句不知道為啥沒有效果，只好用循環(huán)了
   for (UIButton *btn in self.selectedBtn) {
    [btn setSelected:NO];
   }
   //清除連線，清空選中按鈕
   [self.selectedBtn removeAllObjects];
   [self setNeedsDisplay];
  });
   
 }
  
  
}
 
- (void)drawRect:(CGRect)rect {
 
 NSInteger count = self.selectedBtn.count;
  
 //如果沒有按鈕被選中，就不畫線
 if (count == 0) {
  return;
 }
  
 UIBezierPath *path = [UIBezierPath bezierPath];
  
 //把所有點都連完線
 for (int i = 0; i < count; i++) {
  UIButton * btn = self.selectedBtn[i];
  if (i == 0) {
   //如果是第一個點，就設置為起點
   [path moveToPoint:btn.center];
  }else {
   //添加連線
   [path addLineToPoint: btn.center];
  }
 }
  
 //畫最后一個點到手指觸摸點之間的線
 [path addLineToPoint:_curp];
  
 [[UIColor greenColor]set];
 path.lineJoinStyle = kCGLineJoinRound;
 path.lineWidth = 8;
 [path stroke];
  
}
 
- (void)awakeFromNib {
  
 //創(chuàng)建9個按鈕
 for (int i = 0; i < 9; i++) {
  UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
   
  //不允許與用戶交互，也就是點擊事件不作處理
  btn.userInteractionEnabled = NO;
   
  btn.tag = i;
   
  [btn setImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
   
  [btn setImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
   
  [self addSubview:btn];
 }
  
}
 
- (void)layoutSubviews {
  
 [super layoutSubviews];
  
 //布局子控件
 NSInteger count = self.subviews.count;
 //列數(shù)
 int cols = 3;
  
 CGFloat x = 0;
 CGFloat y = 0;
 CGFloat w = 74;
 CGFloat h = 74;
 //間距
 CGFloat margin = (self.bounds.size.width - w * cols) / (cols + 1);
  
 CGFloat col = 0;
 CGFloat row = 0;
  
 for (NSInteger i = 0; i < count; i++) {
   
  UIButton *btn = self.subviews[i];
   
  //計算當前button的列行以及xy值
  col = i % cols;
  row = i / cols;
  x = margin + col * (margin + w);
  y = row * (margin + w);
  btn.frame = CGRectMake(x, y, w, h);
 }
  
  
}
 
@end