2016-1-10 手势解锁demo的实现

一：实现自定义view，在.h,.m文件中代码如下:

#import <UIKit/UIKit.h>
@class ZLLockView;
@protocol ZLLockViewDelegate <NSObject>
- (void)lockView:(ZLLockView *)lockView didSelectedPwd: (NSString *)pwd;
@end
@interface ZLLockView : UIView
@property (nonatomic, weak) id<ZLLockViewDelegate> delegate;

@end

//
//  ZLLockView.m
//  手势解锁demo实现
//
//  Created by Mac on 16/1/9.
//  Copyright © 2016年 Mac. All rights reserved.
//

#import "ZLLockView.h"
@interface ZLLockView()
@property (nonatomic, strong) NSMutableArray *btnsSelected;

@property (nonatomic, assign) CGPoint lastPoint;

@end
@implementation ZLLockView
- (NSMutableArray *)btnsSelected
{
    if (!_btnsSelected) {
        _btnsSelected = [NSMutableArray array];
    }
    return _btnsSelected;
}
- (instancetype)init
{
    if (self = [super init]) {
        [self setBtn];
    }
    return self;
}
- (void)setBtn
{
    for (int i = 0; i < 9; i ++) {
        UIButton *btn = [[UIButton alloc] init];
        btn.tag = i;

        [btn setImage:[UIImage imageNamed:@"gesture_node_normal"] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:@"gesture_node_highlighted"] forState:UIControlStateSelected];
        btn.userInteractionEnabled = NO;
        [self addSubview:btn];
    }
}

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
    UIBezierPath *path = [UIBezierPath bezierPath];
    path.lineWidth = 7;
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    [[UIColor blueColor] set];
    NSInteger count = self.btnsSelected.count;
    if (count ==0)return;
        for (NSInteger i = 0; i < count; i ++) {
        UIButton *btn = self.btnsSelected[i];
        if (i == 0) {
            [path moveToPoint:btn.center];
        }else{
            [path addLineToPoint:btn.center];
        }
    }
    [path addLineToPoint:self.lastPoint];
    [path stroke];
}

- (void)layoutSubviews
{
    CGFloat btnW = 74;
    CGFloat btnH = 74;
//    间距
    CGFloat padding = (self.frame.size.width - btnW * 3) / 4;
    NSInteger count = self.subviews.count;
    for (NSInteger i = 0; i < count; i ++) {
        UIButton *btn =  self.subviews[i];
//        当前按钮所处的列
        NSInteger column = i % 3;
//        计算btn的x值
        CGFloat btnX = (column+1) * padding + column * btnW;
//        当前按钮所处的行
        CGFloat row = i / 3;
        CGFloat btnY = (row+1) * padding + row * btnW;
        btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    }
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self touchesMoved:touches withEvent:event];
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
//    获取当前点
    UITouch *touch = [touches anyObject];
    CGPoint location =  [touch locationInView:touch.view];
  //    判断在不在范围内
    for (UIButton *btn  in self.subviews) {
        if (CGRectContainsPoint(btn.frame, location)) {//判断获得的点在不在范围内
            //将选中的按钮放在数组里
            if (btn.selected == NO) {
                [self.btnsSelected addObject:btn];
            }
            [btn setSelected:YES];
        }
        else self.lastPoint = location;
    }
    [self setNeedsDisplay];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    NSMutableString *pwd = [NSMutableString string];

    for (UIButton *btn in self.btnsSelected) {
        [btn setSelected:NO];
            //拼接选中按钮的索引
            [pwd appendFormat:@"%ld",btn.tag];
    [self setNeedsDisplay];
    }
    [self.btnsSelected removeAllObjects];
    NSLog(@"%@",pwd);
    [self.delegate lockView:self didSelectedPwd:pwd];
}
@end

二：在控制器中实现代理方法，代码如下：

//
//  ViewController.m
//  手势解锁demo实现
//
//  Created by Mac on 16/1/9.
//  Copyright © 2016年 Mac. All rights reserved.
//

#import "ViewController.h"
#import "ZLLockView.h"
#import "MBProgressHUD+CZ.h"
@interface ViewController ()<ZLLockViewDelegate>
@property (nonatomic, strong) ZLLockView *lockView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Home_refresh_bg"]];
    // Do any additional setup after loading the view, typically from a nib.
    ZLLockView *lockView = [[ZLLockView alloc] init];
    CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
    lockView.frame = CGRectMake(0, 0, screenW, screenW);
    lockView.center = self.view.center;
    lockView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:lockView];
    self.lockView = lockView;
    lockView.delegate = self;

}
- (void) lockView:(ZLLockView *)lockView didSelectedPwd:(NSString *)pwd
{
    if ([pwd isEqual:@"012345678"]) {
        [MBProgressHUD showMessage:@"密码正确!"];
        [self.lockView removeFromSuperview];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [MBProgressHUD hideHUD];
        });
    }else{
        [MBProgressHUD showMessage:@"密码错误!"];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [MBProgressHUD hideHUD];
        });
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

三：效果：