//// 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         //觸摸點必須在button中心點30范圍內才選中，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界面了         //NSLog(@"手指抬起");    //這里了執行完之后系統自動調用了重繪方法         //等待2s后清除所有連線，清除Button的選中狀態    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  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