//  VCView.h
//  06-手势解锁#import <UIKit/UIKit.h>@interface VCView : UIView@end//  VCView.m
//  06-手势解锁#import "VCView.h"@implementation VCView
- (void)drawRect:(CGRect)rect
{// 绘图图像UIImage *image = [UIImage imageNamed:@"Home_refresh_bg"];[image drawInRect:rect];}@end//  LockView.h
//  06-手势解锁
#import <UIKit/UIKit.h>@interface LockView : UIView@end//  LockView.m
//  06-手势解锁#import "LockView.h"@implementation LockView// 加载完xib的时候调用
- (void)awakeFromNib
{// 创建9个按钮for ( int i = 0; i < 9; i++) {UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];[btn setImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];[btn setImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];[self addSubview:btn];}
}// 为什么要在这个方法布局子控件，因为只要一调用这个方法，就表示父控件的尺寸确定
- (void)layoutSubviews
{[super layoutSubviews];NSUInteger count = self.subviews.count;int cols = 3;CGFloat x = 0;CGFloat y = 0;CGFloat w = 74;CGFloat h = 74;CGFloat margin = (self.bounds.size.width - cols * w) / (cols + 1);CGFloat col = 0;CGFloat row = 0;for (NSUInteger i = 0; i < count; i++) {UIButton *btn = self.subviews[i];// 获取当前按钮的列数col = i % cols;row = i / cols;x = margin + col * (margin + w);y = row * (margin + w);btn.frame = CGRectMake(x, y, w, h);}}@end

//  VCView.m
//  06-手势解锁
#import "VCView.h"@implementation VCView
- (void)drawRect:(CGRect)rect
{// 绘图图像UIImage *image = [UIImage imageNamed:@"Home_refresh_bg"];[image drawInRect:rect];}@end

//  LockView.m
//  06-手势解锁
#import "LockView.h"@interface LockView ()@property (nonatomic, strong) NSMutableArray *selectedsBtn;@property (nonatomic, assign) CGPoint curP;@end@implementation LockView- (NSMutableArray *)selectedsBtn
{if (_selectedsBtn == nil) {_selectedsBtn = [NSMutableArray array];}return _selectedsBtn;
}- (IBAction)pan:(UIPanGestureRecognizer *)pan
{// 获取触摸点_curP = [pan locationInView:self];// 判断触摸点在不在按钮上for (UIButton *btn in self.subviews) {// 点在不在某个范围内,并且按钮没有被选中if (CGRectContainsPoint(btn.frame, _curP) && btn.selected == NO) {// 点在按钮上btn.selected = YES;// 保存到数组中
            [self.selectedsBtn addObject:btn];}}// 重绘
    [self setNeedsDisplay];if (pan.state == UIGestureRecognizerStateEnded) {// 创建可变字符串NSMutableString *strM = [NSMutableString string];// 保存输入密码for (UIButton *btn in self.selectedsBtn) {[strM appendFormat:@"%ld",btn.tag];}NSLog(@"%@",strM);// 还原界面// 取消所有按钮的选中
        [self.selectedsBtn makeObjectsPerformSelector:@selector(setSelected:) withObject:@(NO)];// 清除画线,把选中按钮清空
        [self.selectedsBtn removeAllObjects];}}
// 加载完xib的时候调用
- (void)awakeFromNib
{// 创建9个按钮for ( int i = 0; i < 9; i++) {UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];// 不允许用户交互，按钮就不能点击，也就不能达到高亮状态btn.userInteractionEnabled = NO;[btn setImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];[btn setImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];btn.tag = i;[self addSubview:btn];}
}// 为什么要在这个方法布局子控件，因为只要一调用这个方法，就表示父控件的尺寸确定
- (void)layoutSubviews
{[super layoutSubviews];NSUInteger count = self.subviews.count;int cols = 3;CGFloat x = 0;CGFloat y = 0;CGFloat w = 74;CGFloat h = 74;CGFloat margin = (self.bounds.size.width - cols * w) / (cols + 1);CGFloat col = 0;CGFloat row = 0;for (NSUInteger i = 0; i < count; i++) {UIButton *btn = self.subviews[i];// 获取当前按钮的列数col = i % cols;row = i / cols;x = margin + col * (margin + w);y = row * (margin + w);btn.frame = CGRectMake(x, y, w, h);}}// 只要调用这个方法，就会把之前绘制的东西全部清掉，重新绘制
- (void)drawRect:(CGRect)rect
{// 没有选中按钮，不需要连线if (self.selectedsBtn.count == 0) return;// 把所有选中按钮中心点连线UIBezierPath *path = [UIBezierPath bezierPath];NSUInteger count = self.selectedsBtn.count;// 把所有选中按钮之间都连好线for (int i = 0; i < count; i++) {UIButton *btn = self.selectedsBtn[i];if (i == 0) {// 设置起点
            [path moveToPoint:btn.center];}else{[path addLineToPoint:btn.center];}}// 连线到手指的触摸点
    [path addLineToPoint:_curP];[[UIColor greenColor] set];path.lineWidth = 10;path.lineJoinStyle = kCGLineJoinRound;[path stroke];}@end