下班回家，随便写写，写了个手势解锁，很多app都有。自己封装了一个，手势解锁视图。代码如下：
头文件

#import <UIKit/UIKit.h>

typedef void(^JGestureLockViewRightResultBlock)();

@interface JGestureLockView : UIView

@property(nonatomic,copy)NSString *rightSecret;
@property(nonatomic,copy)JGestureLockViewRightResultBlock resultBlock;

@end

源文件：

//
//  JGestureLockView.m
//  GestureLockDemo
//
//  Created by jiangtd on 16/6/12.
//  Copyright © 2016年 jiangtd. All rights reserved.
//

#import "JGestureLockView.h"

#define SelectedImgName          @"1.jpg"
#define NormalImgName            @"2.jpg"
#define WrongSelectedImgName     @"33.jpg"
#define WrongLineImgName         @"5"
#define RightLineImgName         @"6.jpg"
#define LockBtnSize              70
#define GestureCirle             20
#define LineWith                 20

typedef NS_ENUM(NSInteger,JGestureLockViewState){
    JGestureLockViewStateRight,
    JGestureLockViewStateWrong,
    JGestureLockViewStateWaitingJudge,
    JGestureLockViewStateNone,
};

@interface JGestureLockView ()

@property(nonatomic,strong)NSMutableArray *viewArr;
@property(nonatomic,strong)NSMutableArray *locationArr;
@property(nonatomic,strong)NSMutableArray *selectedArr;
@property(nonatomic,assign)JGestureLockViewState state;
@property(nonatomic,assign)CGPoint gestureLocation;

@property(nonatomic,strong)NSTimer *timer;

@end

@implementation JGestureLockView

-(id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setUpUI];
    }
    return self;
}

-(void)setUpUI{
    
    _state = JGestureLockViewStateNone;
    
    for (int i = 0; i < 9; i++) {
        UIImageView *imgView = [[UIImageView alloc] init];
        [self.viewArr addObject:imgView];
        imgView.image = [UIImage imageNamed:NormalImgName];
        imgView.frame = CGRectMake(0, 0, LockBtnSize, LockBtnSize);
        imgView.layer.masksToBounds = YES;
        imgView.layer.cornerRadius = LockBtnSize / 2;
        [self addSubview:imgView];
    }
}

-(void)layoutSubviews
{
    [self calculateViewLocation];
    for (int i = 0; i < 9; i++) {
        if (self.viewArr.count - 1 >= i && self.locationArr.count - 1 >= i) {
            UIImageView *imgView = self.viewArr[i];
            CGPoint center = [self.locationArr[i] CGPointValue];
            imgView.center = center;
        }
    }
    
}

-(void)calculateViewLocation{
    CGFloat marignWidth = 25;
    CGFloat lineWidth = (self.frame.size.width - marignWidth * 2 - 3 * LockBtnSize) / 2;
    
    CGFloat beginX = marignWidth + LockBtnSize / 2;
    CGFloat beginY = marignWidth + LockBtnSize / 2;
    for (int i = 0; i< 9; i++) {
        CGFloat x = beginX + (i % 3) * LockBtnSize + (i % 3) * lineWidth;
        CGFloat y = beginY + (i / 3) * LockBtnSize + (i / 3) *lineWidth;
        CGPoint viewCenterPoint = CGPointMake(x, y);
        [self.locationArr addObject:[NSValue valueWithCGPoint:viewCenterPoint]];
        
    }
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    _state = JGestureLockViewStateNone;
    //清除之前选择的结果
    [self.selectedArr removeAllObjects];
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self];
    _gestureLocation = point;
    
    //遍历各点，检测是否落在点的周边
    for (int i = 0;i< 9; i++) {
        NSValue *pointValue = self.locationArr[i];
        CGPoint center = [pointValue CGPointValue];
        if ([self isInCirleWithCenter:center point:point] && ![self hasSelectedWithIndex:i]) {
            [self.selectedArr addObject:@(i)];
           
            if (_state == JGestureLockViewStateNone) {
                _state = JGestureLockViewStateWaitingJudge;
            }
        }
    }
    [self setNeedsDisplay];
}


-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //拼凑选择的答案
    NSMutableString *selectResult = [NSMutableString string];
    for (NSNumber *selectNum in self.selectedArr) {
        [selectResult appendFormat:@"%ld",[selectNum integerValue]];
    }
    if ([selectResult isEqualToString:_rightSecret]) {
        _state = JGestureLockViewStateRight;
    }
    else{
        _state = JGestureLockViewStateWrong;
    }
    NSLog(@"selectResult:%@",selectResult);
    //如果手势正确 block通知解锁成功
    if (_state == JGestureLockViewStateRight && _resultBlock) {
        _resultBlock();
    }
    if (_state == JGestureLockViewStateWrong) {
        _timer = [NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:@selector(timerAction:) userInfo:nil repeats:NO];
        [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
    }
    [self setNeedsDisplay];
}

//从俯视图移除时，再次确认清除定时器
-(void)willMoveToSuperview:(UIView *)newSuperview
{
    if (!newSuperview) {
        [self stopTimer];
    }
}

-(void)stopTimer{
    if (_timer) {
        [_timer invalidate];
        _timer = nil;
    }
}

-(void)dealloc
{
    NSLog(@"dealloc");
}

-(void)timerAction:(id)sender{
    [self stopTimer];
    [self.selectedArr removeAllObjects];
    [self setNeedsDisplay];
}

-(void)drawRect:(CGRect)rect{
    
    for (int i = 0; i< 9; i++) {
        UIImageView *imgView = self.viewArr[i];
        NSString *imgName = @"";
        if ([self hasSelectedWithIndex:i]) {
            imgName = SelectedImgName;
        }
        else{
            imgName = NormalImgName;
        }
        imgView.image = [UIImage imageNamed:imgName];
    }
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineJoin(context, kCGLineJoinRound);
    CGContextSetLineWidth(context, LineWith);
    UIColor *lineColor = nil;
    
    if (_state == JGestureLockViewStateWrong) {
        lineColor = [UIColor colorWithPatternImage:[UIImage imageNamed:WrongLineImgName]];
    }
    else
    {
        lineColor = [UIColor colorWithPatternImage:[UIImage imageNamed:RightLineImgName]];
    }
    CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
    UIBezierPath *bezierPath = [UIBezierPath bezierPath];
    
    if ([self.selectedArr count] > 0) {
        NSInteger beginIndex = [self.selectedArr[0] integerValue];
        CGPoint point = [self.locationArr[beginIndex] CGPointValue];
        [bezierPath moveToPoint:point];
        
        for (int i = 1; i< self.selectedArr.count; i++) {
            
            NSInteger beginIndex = [self.selectedArr[i] integerValue];
            CGPoint point = [self.locationArr[beginIndex] CGPointValue];
            [bezierPath addLineToPoint:point];
        }
        if (_state != JGestureLockViewStateRight || _state != JGestureLockViewStateWrong) {
            [bezierPath addLineToPoint:_gestureLocation];
        }
        
        CGContextAddPath(context, bezierPath.CGPath);
    }
    CGContextStrokePath(context);
}

-(BOOL)hasSelectedWithIndex:(NSInteger)index{
    for (NSNumber *num in self.selectedArr) {
        if ([num integerValue] == index) {
            return YES;
        }
    }
    return NO;
}

-(BOOL)isInCirleWithCenter:(CGPoint)center point:(CGPoint)point{
    CGRect rect = CGRectMake(center.x - GestureCirle, center.y - GestureCirle, GestureCirle * 2, GestureCirle * 2);
    return CGRectContainsPoint(rect, point);
}


#pragma mark =================GetMethod=================

-(NSMutableArray*)viewArr
{
    if (!_viewArr) {
        _viewArr = [NSMutableArray array];
    }
    return _viewArr;
}

-(NSMutableArray*)locationArr
{
    if (!_locationArr) {
        _locationArr = [NSMutableArray array];
    }
    return _locationArr;
}

-(NSMutableArray*)selectedArr{
    if (!_selectedArr) {
        _selectedArr = [NSMutableArray array];
    }
    return _selectedArr;
}

@end

使用：

-(void)setUpUI{
    
    __weak typeof(self) weakSelf = self;
    
    JGestureLockView *gestureView = [[JGestureLockView alloc] init];
    gestureView.backgroundColor = [UIColor blackColor];
    gestureView.alpha = 0.6;
    gestureView.rightSecret = @"01235";
    gestureView.tag = 1;
    gestureView.resultBlock = ^(){
        [weakSelf gestureSecceed];
    };
    [self.view addSubview:gestureView];
    gestureView.frame = CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.width);
}

代码如上，效果如下：

gesture.gif