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