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