iOS仿邮箱大师的九宫格手势密码解锁

//// LockView.m// 手势解锁//// Created by Daniel on 16/4/4.// Copyright © 2016年 Daniel. All rights reserved.//  #import "LockView.h" @interface LockView () /** 保存已选中的按钮 */@property(nonatomic, strong) NSMutableArray *selectedBtn;/** 当前触摸点 */@property(nonatomic, assign) CGPoint curp;@end @implementation LockView - (NSMutableArray *)selectedBtn {  if (_selectedBtn == nil) {    _selectedBtn = [NSMutableArray array];  }  return _selectedBtn;} - (IBAction)pan:(UIPanGestureRecognizer *)pan {     //获取当前触摸点  _curp = [pan locationInView:self];     //判断触摸点在不在按钮上  for (UIButton *btn in self.subviews) {    //如果在按钮上就设置选中状态         //触摸点必须在button中心点30范围内才选中，更精确，体验更好    CGRect rect = CGRectMake(btn.center.x, btn.center.y, 30, 30);         if (CGRectContainsPoint(rect, _curp) && btn.selected == NO) {      btn.selected = YES;             //将这个选中的按钮保存起来      [self.selectedBtn addObject:btn];                  }  }     //重绘，调用drawRect方法  [self setNeedsDisplay];     //手指抬起时  if(pan.state == UIGestureRecognizerStateEnded) {         NSMutableString *strM = [NSMutableString string];         //如果当前触摸点不在Button上，则手指抬起时，就显示选中的Button以及连线    UIButton *lastBtn = [self.selectedBtn lastObject];         //把最后一个选中按钮的中心点设置为当前触摸点，清除最后多出来的一截连线    _curp = lastBtn.center;     for (UIButton *btn in self.selectedBtn) {      //保存手势密码      [strM appendFormat:@"%ld", btn.tag];    }         //strM就是密码了    NSLog(@"%@",strM);         //TODO：对比之前保存的密码，如果对了就直接跳转界面了         //NSLog(@"手指抬起");    //这里了执行完之后系统自动调用了重绘方法         //等待2s后清除所有连线，清除Button的选中状态    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{      //取消按钮选中      //[self.selectedBtn makeObjectsPerformSelector:@selector(setSelected:) withObject:NO];这句不知道为啥没有效果，只好用循环了      for (UIButton *btn in self.selectedBtn) {        [btn setSelected:NO];      }      //清除连线，清空选中按钮      [self.selectedBtn removeAllObjects];      [self setNeedsDisplay];    });       }      } - (void)drawRect:(CGRect)rect {   NSInteger count = self.selectedBtn.count;     //如果没有按钮被选中，就不画线  if (count == 0) {    return;  }     UIBezierPath *path = [UIBezierPath bezierPath];     //把所有点都连完线  for (int i = 0; i < count; i++) {    UIButton * btn = self.selectedBtn[i];    if (i == 0) {      //如果是第一个点，就设置为起点      [path moveToPoint:btn.center];    }else {      //添加连线      [path addLineToPoint: btn.center];    }  }     //画最后一个点到手指触摸点之间的线  [path addLineToPoint:_curp];     [[UIColor greenColor]set];  path.lineJoinStyle = kCGLineJoinRound;  path.lineWidth = 8;  [path stroke];   } - (void)awakeFromNib {     //创建9个按钮  for (int i = 0; i < 9; i++) {    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];         //不允许与用户交互，也就是点击事件不作处理    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;  //列数  int cols = 3;     CGFloat x = 0;  CGFloat y = 0;  CGFloat w = 74;  CGFloat h = 74;  //间距  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];         //计算当前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