手势密码实现
手势密码 一般常常用于金融项目，做的是安全相关的业务。具体实现如下思路，我把它分为view层和逻辑层。我将数据层合并到view层中了，最好是加上数据层用于处理加密的密码和密码的存储
view层
view层主要处理，包括（九个按钮）touchesBegan,touchesMoved,touchesEnded，点与点之间画线，手指滑动画线，画线主要是在drawRect中重绘，提到这里必须不能忘记setNeedsDisplay这个方法。还要记录经过的按钮btnsArray（存放按钮的数组），这个 可以和相关的具体值做映射，也可以直接设置btn 的tag,还要添加完成绘画的回调。提供给逻辑层去处理。
逻辑层
用于处理完成交互后的业务，包括（请求接口，异常逻辑显示，等等）
具体的demo点这里
具体的code：
view.h
//
// YHGesturePasswordView.h
// 手势密码
//
// Created by mrlee on 2017/3/5.
// Copyright © 2017年 mrlee. All rights reserved.
//
typedef enum {
GestureSetPassword, //设置手势密码
GestureResultPassword //已有手势密码教验
} PasswordState;
//设置密码的3种状态
typedef enum {
FristPwd, //第一次设置密码
PwdNoValue, //二次设置密码不一致
SetPwdSuccess, //设置密码成功
Other
}SetPwdState;
#import <UIKit/UIKit.h>
@interface YHGesturePasswordView : UIView
/** btn图片*/
@property (nonatomic,strong)UIImage *btnImage;
///选中的图片
@property (nonatomic,strong)UIImage *btnSelectImage;
///划线颜色
@property (nonatomic,strong)UIColor *lineColor;
/** 解锁手势完成之后判断结果时调用的block */
@property (nonatomic,copy)BOOL (^sendReaultData)(NSString *str);
//设置手势密码
@property(nonatomic,copy)void(^setPwdBlock)(SetPwdState pwdState);
// init
-(instancetype)initWithFrame:(CGRect)frame WithState:(PasswordState)state;
@end
view.m
//
// YHGesturePasswordView.m
// 手势密码
//
// Created by mrlee on 2017/3/5.
// Copyright © 2017年 mrlee. All rights reserved.
//
#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#import "YHCustomButton.h"
#import "YHGesturePasswordView.h"
#import <CommonCrypto/CommonDigest.h>
@interface YHGesturePasswordView(){
/** 判断是当设置密码用，还是解锁密码用*/
PasswordState Amode;
}
/** 所有的按钮集合*/
@property (nonatomic,strong)NSMutableArray * allBtnsArray;
/** 解锁时手指经过的所有的btn集合*/
@property (nonatomic,strong)NSMutableArray * btnsArray;
/** 手指当前的触摸位置*/
@property (nonatomic,assign)CGPoint currentPoint;
@end
@implementation YHGesturePasswordView
-(instancetype)initWithFrame:(CGRect)frame WithState:(PasswordState)state{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor clearColor];
Amode = state;
for (int i = 0; i<9; i++) {
YHCustomButton *btn = [[YHCustomButton alloc]init];
[btn setTag:i];
btn.userInteractionEnabled = NO;
if (self.lineColor == nil) {
self.lineColor = [UIColor greenColor];
}
[self addSubview:btn];
}
}
return self;
}
-(void)drawRect:(CGRect)rect{
// 每次调用这个方法的时候如果背景颜色是default会产生缓存，如果设置了颜色之后就没有缓存，绘制之前需要清除缓存
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextClearRect(ctx, rect);//清空上下文
for (int i = 0; i<self.btnsArray.count; i++) {
UIButton *btn = self.btnsArray[i];
if (i == 0) {
CGContextMoveToPoint(ctx, btn.center.x, btn.center.y);
}else{
CGContextAddLineToPoint(ctx, btn.center.x, btn.center.y);
}
}
if (!CGPointEqualToPoint(self.currentPoint, CGPointZero)) {//如果起点不是CGPointZero的话才来划线
CGContextAddLineToPoint(ctx, self.currentPoint.x, self.currentPoint.y);
}
CGContextSetLineWidth(ctx, 12);
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineJoin(ctx, kCGLineJoinRound);
[self.lineColor set];
CGContextStrokePath(ctx);
}
-(void)layoutSubviews{
[self.allBtnsArray removeAllObjects];
for (int index =0; index<self.subviews.count; index ++) {
if ([self.subviews[index] isKindOfClass:[YHCustomButton class]]) {
[self.allBtnsArray addObject:self.subviews[index]];
}
}
// button 绘制九宫格
[self drawUi];
}
#pragma mark Private method
-(void)drawUi{
for (int index = 0; index<self.allBtnsArray.count; index ++) {
//拿到每个btn
UIButton *btn = self.subviews[index];
//设置frame
CGFloat btnW = 74;
CGFloat btnH = 74;
CGFloat margin = (SCREEN_WIDTH - (btnW *3))/4;
//x = 间距 + 列号*（间距+btnW）
CGFloat btnX = margin + (index % 3)*(margin + btnW);
CGFloat btnY = margin + (index / 3)*(margin + btnH);
btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
}
}
//设置密码
-(SetPwdState)pwdValue:(NSString *)str{
if ([[NSUserDefaults standardUserDefaults] objectForKey:@"pwdValue"] == nil) {
//第一次设置
[[NSUserDefaults standardUserDefaults] setValue:str forKey:@"pwdValue"];
return FristPwd;
}
if ([str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {
//设置成功
return SetPwdSuccess;
}
if (![str isEqualToString: [[NSUserDefaults standardUserDefaults]objectForKey:@"pwdValue"]]) {
//二次设置不一样
return PwdNoValue;
}
return Other;
}
//清空
-(void)clear{
[self.btnsArray removeAllObjects];
self.currentPoint = CGPointZero;
[self setNeedsDisplay];
self.lineColor = [UIColor greenColor];
self.userInteractionEnabled = YES;
}
//获取触摸的点
-(CGPoint)getCurrentTouch:(NSSet<UITouch*> *)touches{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:touch.view];
return point;
}
-(UIButton *)getCurrentBtnWithPoint:(CGPoint) currentPoint{
for (UIButton *btn in self.subviews) {
if (CGRectContainsPoint(btn.frame, currentPoint)) {
return btn;
}
}
return nil;
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
CGPoint point = [self getCurrentTouch:touches];
UIButton *btn = [self getCurrentBtnWithPoint:point];
if (btn && btn.selected != YES) {
btn.selected = YES;
[self.btnsArray addObject:btn];
NSLog(@" array is value %@",self.btnsArray);
}
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
CGPoint movePoint = [self getCurrentTouch:touches];
UIButton *btn = [self getCurrentBtnWithPoint:movePoint];
if (btn && btn.selected !=YES) {
btn.selected = YES;
[self.btnsArray addObject:btn];
NSLog(@"btn is value %@",self.btnsArray);
}
self.currentPoint = movePoint;
[self setNeedsDisplay];
}
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
for (UIButton *btn in self.btnsArray) {
[btn setSelected:NO];
}
NSMutableString *result = [NSMutableString string];
for (UIButton *btn in self.btnsArray) {
[result appendString: [NSString stringWithFormat:@"%ld",(long)btn.tag]];
}
switch (Amode) {
case GestureSetPassword:{
//设置手势密码
self.setPwdBlock([self pwdValue:result]);
}
break;
case GestureResultPassword :{
//获取手势密码结果
if (self.sendReaultData) {
if (self.sendReaultData(result) == YES) {
NSLog(@"success");
[self clear];
}else{
NSLog(@"手势有误");
}
}
}
break;
default:
break;
}
//返回结果
[self clear];
}
#pragma mark 延时加载
-(NSMutableArray *)btnsArray{
if (_btnsArray == nil) {
_btnsArray = [NSMutableArray array];
}
return _btnsArray;
}
-(NSMutableArray *)allBtnsArray{
if (_allBtnsArray == nil) {
_allBtnsArray = [NSMutableArray array];
}
return _allBtnsArray;
}
@end
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持找一找教程网。
