手势解锁的实现

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模仿支付宝手势解锁

思路总结：

1>touchBegin (获取当前的触摸点，如果当前的触摸点在按钮的范围内，并且该按钮的状态不是高亮，就将该按钮添加到数组中)

2>touchMove(将当前的触摸点赋值给标记属性【self setNeedsDisplay】)

3>touchEnd(如果当前点不在按钮范围内，就将当前点赋值为数组中的最后一个点)

4>drawRect(遍历数组中的按钮，将第一个按钮设置为起点，连线，连接当前点)

主要代码：

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    UITouch * touch = touches.anyObject;        // 触摸点    CGPoint loc = [touch locationInView:touch.view];        [self getPointWithLoc:loc];   // [self setNeedsDisplay];    }- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{        UITouch * touch = touches.anyObject;        // 触摸点    CGPoint loc = [touch locationInView:touch.view];        self.currentPoint = loc;        [self getPointWithLoc:loc];            [self setNeedsDisplay];}

// 获取当前点- (void)getPointWithLoc:(CGPoint)loc{    CGFloat width = 26;        // 遍历数组    for (UIButton * btn in self.subviews) {                CGFloat btnX = btn.center.x - width * 0.5;        CGFloat btnY = btn.center.y - width * 0.5;        // 判断触摸点是不是在按钮的frame里 在的话，显示高亮        if (CGRectContainsPoint(CGRectMake(btnX, btnY, width, width), loc) && btn.highlighted == NO) {                        btn.highlighted = YES;                        // 将选中的按钮添加到数组中            [self.selBtnArray addObject:btn];        }    }}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{        // 将当前触摸点设置为最后一个点    self.currentPoint = [[self.selBtnArray lastObject] center];    // 拼接密码    NSMutableString * passWord = [NSMutableString string];        for (UIButton * btn in self.selBtnArray) {                [passWord appendFormat:@"%@",@(btn.tag)];    }        BOOL isTure = NO;    // // 验证密码     if ([self.delegate respondsToSelector:@selector(unLockView:withPassWord:)]) {               isTure = [self.delegate unLockView:self withPassWord:passWord];    }        if (isTure) { // 密码为真                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{                        // 将按钮的状态改变            for (UIButton * btn in self.selBtnArray) {                                btn.highlighted = NO;            }            // 将选中的按钮清除            [self.selBtnArray removeAllObjects];                        [self setNeedsDisplay];        });    }else{// 密码为假                self.userInteractionEnabled = NO;                for (UIButton * btn in self.selBtnArray) {                        btn.enabled = NO;            btn.highlighted = NO;        }               _lineColor = [UIColor redColor];                [self setNeedsDisplay];                        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{                        self.userInteractionEnabled = YES;                        for (UIButton * btn in self.selBtnArray) {                                btn.enabled = YES;            }                        // 将选中的按钮清除            [self.selBtnArray removeAllObjects];                        [self setNeedsDisplay];                        self.lineColor = WTColor;        });    }}

- (void)drawRect:(CGRect)rect{    // 重写drawRect方法    if (self.selBtnArray.count == 0)  return;        UIBezierPath * path = [UIBezierPath bezierPath];    // 遍历选中的数组    for(int i = 0 ;i < self.selBtnArray.count; i ++ ){                UIButton * btn = self.selBtnArray[i];                if (0 == i) {                        // 第一个按钮设置为起点            [path moveToPoint:btn.center];        }    // 连线    [path addLineToPoint:btn.center];}    [path addLineToPoint:_currentPoint];    // 线条颜色    [self.lineColor set];    // 线条的宽度    path.lineWidth = 13;    // 线条样式    path.lineJoinStyle =  kCGLineCapRound;    path.lineCapStyle = kCGLineCapRound;    // 渲染    [path stroke];}

012为正确密码

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