//// 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