手势解锁demo

#import "LSbackView.h"

@interface LSbackView()

@property(nonatomic,strong)NSMutableArray *btnArray;

@property(nonatomic,strong)NSMutableArray *selectionArray;

@property(nonatomic,assign)CGPoint lastPoint;

@property(nonatomic,strong)UIColor *lineColor;

@end

@implementation LSbackView

-(UIColor *)lineColor{

    if (!_lineColor) {

        _lineColor = [UIColor whiteColor];

        

    }

    return _lineColor;

}

-(NSMutableArray *)selectionArray{

    if (!_selectionArray) {

        _selectionArray = [NSMutableArray array];

    }

    return _selectionArray;

}

-(NSMutableArray *)btnArray{

    if (!_btnArray) {

        _btnArray = [NSMutableArray array];

        for (NSInteger i=0; i<9; i++) {

            UIButton *button = [[UIButton alloc]init];

            button.tag = i;

            NSLog(@"%ld",i);

            button.userInteractionEnabled = NO;

            [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];

            [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateHighlighted];

            

            [button setBackgroundImage:[UIImage imageNamed:@"gesture_node_error"] forState:UIControlStateSelected];

            [_btnArray addObject:button];

            

        }

    }

    return _btnArray;

}

-(instancetype)initWithFrame:(CGRect)frame{

    if (self=[super initWithFrame:frame]) {

      

        

        CGFloat W = self.frame.size.width;

        CGFloat H = self.frame.size.height;

        

        CGFloat btnW = 74;

        CGFloat btnH = 74;

        

        NSInteger column = 3;

        CGFloat marginW = (W-column*btnW)/(column-1);

        CGFloat marginH = (H-column*btnH)/(column-1);

        

        for (NSInteger i=0; i

            NSInteger row = i/column;

            NSInteger col = i%column;

            CGFloat btnX = (btnW + marginW)*col;

            CGFloat btnY = (btnH + marginH)*row;

            

            UIButton *btn = self.btnArray[i];

            

            btn.frame = CGRectMake(btnX, btnY, btnW, btnH);

            [self addSubview:btn];

        }

        

    }

    return self;

}

-(void)drawRect:(CGRect)rect{

    UIBezierPath *path = [UIBezierPath bezierPath];

    for (NSInteger i=0;i

        if (i==0) {

            [path moveToPoint:self.selectionArray[i].center];

        }else{

            [path addLineToPoint:self.selectionArray[i].center];

        }

    }

    

    if (self.selectionArray.count>0) {

        [path addLineToPoint:self.lastPoint];

    }

    

    [self.lineColor set];

    [path stroke];

    

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

//    UITouch *touch = touches.anyObject;

//    CGPoint loc = [touch locationInView:touch.view];

//    for (UIButton *btn in self.btnArray) {

//        if (CGRectContainsPoint(btn.frame, loc)) {

//            btn.highlighted = YES;

//        }

//    }

    for (UITouch *touch in touches) {

        CGPoint loc = [touch locationInView:touch.view];

        self.lastPoint = loc;

        for (UIButton *btn in self.btnArray) {

            if (CGRectContainsPoint(btn.frame, loc)&&!btn.highlighted) {

                

                btn.highlighted = YES;

                [_selectionArray addObject:btn];

            }

        }

    }

     [self setNeedsDisplay];

    

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch = touches.anyObject;

    CGPoint loc = [touch locationInView:touch.view];

    self.lastPoint = loc;

    for (UIButton *btn in self.btnArray) {

        if (CGRectContainsPoint(btn.frame, loc)&&!btn.highlighted) {

        

            btn.highlighted = YES;

            [_selectionArray addObject:btn];

        }

    }

     [self setNeedsDisplay];

}

//-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

//    

//}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

    self.lastPoint = [self.selectionArray lastObject].center;

  

    NSMutableString *str = [NSMutableString string];

    for (UIButton *button in self.selectionArray) {

        [str appendFormat:@"%@",@(button.tag)];

    }

    if ([str isEqualToString:@"012"]) {

        [self clear];

    }else{

        self.lineColor = [UIColor redColor];

        [self setNeedsDisplay];

        self.userInteractionEnabled = NO;

        for (UIButton *button in self.selectionArray) {

            button.highlighted = NO;

            button.selected = YES;

        }

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

            [self clear];

            self.userInteractionEnabled = YES;

            

        });

    }

    

}

-(void)clear{

    for (UIButton *button in self.selectionArray) {

        button.highlighted = NO;

        button.selected = NO;

        self.lineColor = [UIColor whiteColor];

    }

    [self.selectionArray removeAllObjects];

    [self setNeedsDisplay];

}

@end

最容易出坑的地方

CGRectContainPoint方法

还有在drawRect方法里添加线段的方法

设置数组添加线段的方法

最后血淋淋呀，还有添加选择按钮进数组的时候，如果没有！btn.highlighted这个条件，密码始终是打印一堆，人都要疯了

添加线段注意写在括号的里外问题，注意呀  注意