iOS 手勢滑動解鎖功能簡析

題記

在平常的生活中,我們大概經(jīng)常遇見手勢滑動解鎖---也就是九宮格啊,已經(jīng)出現(xiàn)好久了,雖然隨著Apple的指紋解鎖的發(fā)展手勢解鎖雖然還有但是因?yàn)槠洳蝗缰讣y解鎖方便也用的也少了,但是在大多數(shù)APP中這兩種方式都是并存的,比如qq,微信,支付寶等等,最近項(xiàng)目里面也剛好有這個需求,趁著剛完成抽出時間來記錄下來當(dāng)時的一些思路,可能有的地方理解的不到位,還需多總結(jié),閑言少敘了,看重點(diǎn)。
功能描述如圖:大概說一下思路,這個功能用來做相當(dāng)于密令,用于兩端的匹配,教師端設(shè)置了路徑生成密碼,儲存在本地,學(xué)生端用來滑動輸入進(jìn)行驗(yàn)證。然后根據(jù)各種情況上部的label給與各種提示信息,這里只是一個比較原始簡陋的demo,也只是實(shí)現(xiàn)了我們最常見的功能,所以重在領(lǐng)會其中的精神了,哈哈哈。


GestureUnlockPic.gif

功能模塊分析

根據(jù)GIF可以簡單的把這塊兒功能分為幾個部分來理解,第一個就是首頁:ViewController,首頁里面有兩個Controller分別是StudViewControllerTeacViewController用來分作不同功能的載體。在StudViewController中分為三部分上中下statusLabel GestureLockView clearBtn,其中GestureLockView是手勢解鎖界面。在TeacViewController中也是分為三部分,statusLabel GestureLockView BottomView下方的bottomView分為兩個button resetBtn重置按鈕sureBtn確定按鈕。說完大體的結(jié)構(gòu),接下來分部分說一下每個功能的實(shí)現(xiàn)思路。

拆解分析

首先說一下GestureLockView這個view控件:

首先在.h 文件中

  • 定義兩個枚舉:分別用來定義兩端的不同類型,stu端用ResultKindType來對畫的手勢結(jié)果進(jìn)行分類分為這四類,下面都會用到,并說明用途。teac端用TeacKindType來分兩類:
//檢測手勢密碼答案情況 對/錯/不夠4個數(shù)字
typedef NS_ENUM(NSUInteger, ResultKindType) {
    ResultKindTypeTrue,
    ResultKindTypeFalse,
    ResultKindTypeNoEnough,
    ResultKindTypeClear
};

typedef NS_ENUM(NSUInteger, TeacKindType) {
    TeacKindTypeNoEnough,
    TeacKindTypeTrue
};
  • 協(xié)議:用來監(jiān)聽手勢變化時傳出的轉(zhuǎn)化的密碼(這個密碼是用button的tag值來表示的),因?yàn)槭謩菔窃谧兓?,所以這里用了NSMutableString向外傳遞。
@protocol GestureLockDelegate <NSObject>

- (void)gestureLockView:(GestureLockView *)lockView drawRectFinished:(NSMutableString *)gesturePassword;

@end
  • 屬性:
@property (nonatomic, weak) id<GestureLockDelegate> delegate;

@property (nonatomic, assign) BOOL isTeac;//教師端 用來驗(yàn)證是否是教師端
  • 方法:
- (void)clearLockView;//清除布局 重新開始

- (void)checkPwdResult:(ResultKindType)resultType;//檢測學(xué)生端的結(jié)果

- (void)checkTeacResult:(TeacKindType)resultType;//檢測老師端的結(jié)果

.m文件中(具體創(chuàng)建和應(yīng)用的方法)

  • 聲明變量供下方使用:
@interface GestureLockView ()

@property (strong, nonatomic) NSMutableArray *selectBtns;//選中的按鈕數(shù)組
@property (nonatomic, strong) NSMutableArray *errorBtns;//錯誤的按鈕數(shù)組
@property(nonatomic, assign)BOOL finished;//是否完成
@property (nonatomic, assign) CGPoint currentPoint;//當(dāng)前觸摸點(diǎn)
@property (nonatomic, assign) ResultKindType resultType;//學(xué)生端結(jié)果
@property (nonatomic, assign) TeacKindType teacResultType;//教師端結(jié)果

@end
  • 懶加載初始化數(shù)組
- (NSMutableArray *)selectBtns {
    if (!_selectBtns) {
        _selectBtns = [NSMutableArray array];
    }
    return _selectBtns;
}

- (NSMutableArray *)errorBtns {
    if (!_errorBtns) {
        _errorBtns = [NSMutableArray array];
    }
    return _errorBtns;
}
  • 子視圖初始化:在這里創(chuàng)建9個按鈕并將它們add到self中,并給self 添加UIPanGestureRecognizer *pan手勢
- (void)initSubviews {
    self.backgroundColor = [UIColor clearColor];
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    [self addGestureRecognizer:pan];
    
    //創(chuàng)建9個按鈕
    for (NSInteger i = 0; i < 9; i++) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.userInteractionEnabled = NO;
        [btn setImage:[UIImage imageNamed:@"sign_img_circle_n"] forState:UIControlStateNormal];
        [btn setImage:[UIImage imageNamed:@"sign_img_circle_s"] forState:UIControlStateSelected];
        btn.tag = i+1;
        [self addSubview:btn];
    }
}
  • 界面布局:
   CGFloat minWidth = MIN(self.bounds.size.height, self.bounds.size.width);
    CGFloat boundsWidth = self.bounds.size.width;
    CGFloat margin = (minWidth - cols * w) / (cols + 1);//間距
    CGFloat xMargin = (boundsWidth-2*margin-3*w)/2;

這里這一塊是對不同機(jī)型進(jìn)行的適配,因?yàn)檫@個控件有可能會被添加在一個height<width的view上,所以在這里margin是指比較短的長度也就是上下的height,xMargin是用來對width進(jìn)行伸展的,這塊是這個邏輯,應(yīng)該可以通用的。

- (void)layoutSubviews {
    [super layoutSubviews];
    NSUInteger count = self.subviews.count;
    int cols = 3;//總列數(shù)
    CGFloat x = 0,y = 0,w = 0,h = 0;
    if (SCREEN_WIDTH == 320) {
        w = 50;
        h = 50;
    } else {
        w = 60;
        h = 60;
    }
    CGFloat minWidth = MIN(self.bounds.size.height, self.bounds.size.width);
    CGFloat boundsWidth = self.bounds.size.width;
    CGFloat margin = (minWidth - cols * w) / (cols + 1);//間距
    CGFloat xMargin = (boundsWidth-2*margin-3*w)/2;
    
    CGFloat col = 0;
    CGFloat row = 0;
    for (int i = 0; i < count; i++) {
        col = i % cols;
        row = i / cols;
        if (i == 0 || i == 3 || i == 6) {
            x = xMargin;
        } else if (i == 1 || i == 4 || i == 7) {
            x = xMargin + w + margin;
        } else {
            x = xMargin + 2 * (margin+w);
        }
        y = (w+margin)*row;
        UIButton *btn = self.subviews[i];
        btn.frame = CGRectMake(x, y, w, h);
    }
}
  • 手勢代理方法: 在手勢代理方法中監(jiān)聽手勢滑動位置的改變,當(dāng)pan.state == UIGestureRecognizerStateBegan開始滑動的時候,從盛放顯示錯誤狀態(tài)的button改變?yōu)槠胀ǔ跏紶顟B(tài),并且將self.errorBtns數(shù)組清除。將_currentPoint = [pan locationInView:self];檢測當(dāng)滑動時當(dāng)前的位置point,如果劃過的位置包含在button的范圍內(nèi),如果button.selected == NO那么將button.selected = YES;//設(shè)置為選中并且將button添加到self.selectBtns數(shù)組中[self.selectBtns addObject:button];調(diào)用[self setNeedsDisplay];方法進(jìn)行重繪,調(diào)用setNeedsDisplay方法系統(tǒng)會自動調(diào)用drawReact方法進(jìn)行界面的重新布局。最后監(jiān)聽手指是否松開//監(jiān)聽手指松開 if (pan.state == UIGestureRecognizerStateEnded) { self.finished = YES; }如果松開將self.finished = YES;
#pragma mark 手勢
- (void)pan:(UIPanGestureRecognizer *)pan {
    
    if (pan.state == UIGestureRecognizerStateBegan) {
        for (UIButton *btn in _errorBtns) {
            [btn setImage:[UIImage imageNamed:@"sign_img_circle_n"] forState:UIControlStateNormal];
            [btn setImage:[UIImage imageNamed:@"sign_img_circle_s"] forState:UIControlStateSelected];
        }
        [self.errorBtns removeAllObjects];
    }
    _currentPoint = [pan locationInView:self];
    
    for (UIButton *button in self.subviews) {
        if (CGRectContainsPoint(button.frame, _currentPoint)) {
            if (button.selected == NO) {
                //點(diǎn)在按鈕上
                button.selected = YES;//設(shè)置為選中
                [self.selectBtns addObject:button];
            } else {
                
            }
        }
    }
    
    //重繪
    [self setNeedsDisplay];
    //監(jiān)聽手指松開
    if (pan.state == UIGestureRecognizerStateEnded) {
        self.finished = YES;
    }
}
  • 傳遞設(shè)置的手勢密碼方法

//傳遞設(shè)置的手勢密碼
- (NSMutableString *)transferGestureResult {
    //創(chuàng)建可變字符串
    NSMutableString *result = [NSMutableString string];
    for (UIButton *btn in self.selectBtns) {
        [result appendFormat:@"%ld", btn.tag - 1];
    }
    return result;
}
  • 兩端的外部操作對內(nèi)部狀態(tài)的改變:

case ResultKindTypeFalse:
_errorBtns = [NSMutableArray arrayWithArray:self.selectBtns];
break;

這里如果繪制錯誤,將之前選中的按鈕放在 _errorBtns盛放錯誤按鈕的數(shù)組中

case ResultKindTypeClear:
{
[[UIColor clearColor] set];
for (int i = 0; i < self.errorBtns.count; i++) {
UIButton *btn = [self.errorBtns objectAtIndex:i];
[btn setImage:[UIImage imageNamed:@"sign_img_circle_n"] forState:UIControlStateNormal];
}
[self.errorBtns removeAllObjects];
}
break;

當(dāng)外界改變狀態(tài)為“清除”時,將路徑置為透明 并改變errorBtns數(shù)組中button的背景色狀態(tài),并且將errorBtns清空,這里為什么在這里做這些改變呢?這是因?yàn)樵趯W(xué)生端進(jìn)行清除操作的時候,手勢的狀態(tài)已經(jīng)是finish并且這是后代理方法已經(jīng)走完,并且我們在調(diào)用clearLockView方法的時候也將selectBtns數(shù)組清空了,因此在setNeedsDisplay被調(diào)用,drawReact進(jìn)行重繪的時候,檢測到if (_selectBtns.count == 0) return;也就不再繼續(xù)往下進(jìn)行了。

//學(xué)生端狀態(tài)改變
- (void)checkPwdResult:(ResultKindType)resultType {
    self.resultType = resultType;
    switch (resultType) {
        case ResultKindTypeFalse:
            _errorBtns = [NSMutableArray arrayWithArray:self.selectBtns];
            break;
            case ResultKindTypeTrue:
            break;
            case ResultKindTypeNoEnough:
            break;
            case ResultKindTypeClear:
        {
            [[UIColor clearColor] set];
            for (int i = 0; i < self.errorBtns.count; i++) {
                UIButton *btn =  [self.errorBtns objectAtIndex:i];
                [btn setImage:[UIImage imageNamed:@"sign_img_circle_n"] forState:UIControlStateNormal];
            }
            [self.errorBtns removeAllObjects];
        }
            break;
        default:
            break;
    }
    [self clearLockView];
}
//教師端狀態(tài)改變
- (void)checkTeacResult:(TeacKindType)resultType {
    self.teacResultType = resultType;
    switch (resultType) {
        case TeacKindTypeTrue:
            break;
        case TeacKindTypeNoEnough:{
            [self clearLockView];
        }
            break;
        default:
            break;
    }
}
  • 清除方法: 這里將self.finished = NO;因?yàn)槿绻峭ㄟ^代理將值傳到外界并且外界對該值進(jìn)行了校驗(yàn),對內(nèi)容的resultType進(jìn)行改變,這時候其實(shí)還是在drawReact方法中,并且已經(jīng)走完了self.finished 方法,在這里將其設(shè)置為NO 是為了改變下一次繪制的finished狀態(tài),雖然不起眼,但是也是寫出來了。
- (void)clearLockView {
    self.finished = NO;
    //遍歷所有選中的按鈕
    for (UIButton *btn in self.selectBtns) {
        //取消選中狀態(tài)
        btn.selected = NO;
    }
    [self.selectBtns removeAllObjects];
    //
    [self setNeedsDisplay];
}
  • 利用貝塞爾曲線繪制路徑,并根據(jù)對應(yīng)的狀態(tài)修改路徑顏色,按鈕顏色,當(dāng)系統(tǒng)調(diào)用這個方法的時候會進(jìn)行重繪,重繪時,從self.selectBtns數(shù)組中取出選中的button,當(dāng)button是第一個的時候?qū)⑵湓O(shè)置為bezierPath的起點(diǎn)[path moveToPoint:btn.center];其余的按鈕繪制路徑[path addLineToPoint:btn.center];。在這里判斷是否松開手指,在這個判斷里邏輯判斷比較多,大致捋一下,當(dāng)self.finished == YES的時候,就將創(chuàng)建的密碼利用先前聲明的代理傳遞出去在外部進(jìn)行檢驗(yàn)。根據(jù)外部返回的操作狀態(tài),如果是self.isTeac根據(jù)返回的結(jié)果狀態(tài)進(jìn)行判斷

case TeacKindTypeNoEnough:
{
[[UIColor clearColor] set];
}
break;
case TeacKindTypeTrue:
{
[[UIColor colorWithRed:94/255.0 green:195/255.0 blue:49/255.0 alpha:0.8] set];
}

如果畫的點(diǎn)不足4個,那么清除選中的點(diǎn)并且將繪制路徑的顏色透明(或者如果考慮到性能的話,最好用和背景色一樣的顏色),如果是繪制完成,用“綠色”填充,這里我選擇了教師繪制完畢不清楚繪制路徑,以便查看。
如果是學(xué)生端的話:繪制正確清除路徑,錯誤用“紅色”標(biāo)識路徑并從盛放錯誤按鈕的數(shù)組self.errorBtns中取出按鈕進(jìn)行狀態(tài)的改變。

switch (self.resultType) {
case ResultKindTypeTrue:
{
//正確
[[UIColor clearColor] set];
}
break;
case ResultKindTypeFalse:
{
//錯誤
[[UIColor redColor] set];
for (int i = 0; i < self.errorBtns.count; i++) {
UIButton *btn = [self.errorBtns objectAtIndex:i];
[btn setImage:[UIImage imageNamed:@"sign_img_circle_p"] forState:UIControlStateNormal];
}
break;
case ResultKindTypeNoEnough:
{
[[UIColor clearColor] set];
}
break;
case ResultKindTypeClear:
break;
default:
break;
}

之后便是若沒有finish 就是在繪制路徑了,對path進(jìn)行一些相關(guān)設(shè)置。

- (void)drawRect:(CGRect)rect {
    if (_selectBtns.count == 0) return;
    // 把所有選中按鈕中心點(diǎn)連線
    UIBezierPath *path = [UIBezierPath bezierPath];
    for (int i = 0; i < self.selectBtns.count; i ++) {
        UIButton *btn = self.selectBtns[i];
        if (i == 0) {
            [path moveToPoint:btn.center]; // 設(shè)置起點(diǎn)
        } else {
            [path addLineToPoint:btn.center];
        }
    }
    
    //判斷是否松開手指
    if (self.finished) {
        //松開手
        NSMutableString *pwd = [self transferGestureResult];//傳遞創(chuàng)建的密碼
        [[UIColor colorWithRed:94/255.0 green:195/255.0 blue:49/255.0 alpha:0.8] set];
        if ([self.delegate respondsToSelector:@selector(gestureLockView:drawRectFinished:)]) {
            [self.delegate gestureLockView:self drawRectFinished:pwd];
        }
        
        if (self.isTeac) {
            //教師端
            switch (self.teacResultType) {
                case TeacKindTypeNoEnough:
                {
                    [[UIColor clearColor] set];
                }
                    break;
                case TeacKindTypeTrue:
                {
                    [[UIColor colorWithRed:94/255.0 green:195/255.0 blue:49/255.0 alpha:0.8] set];
                }
                    break;
                default:
                    break;
            }
        } else {
            switch (self.resultType) {
                case ResultKindTypeTrue:
                {
                    //正確
                    [[UIColor clearColor] set];
                }
                    break;
                case ResultKindTypeFalse:
                {
                    //錯誤
                    [[UIColor redColor] set];
                    for (int i = 0; i < self.errorBtns.count; i++) {
                        UIButton *btn =  [self.errorBtns objectAtIndex:i];
                        [btn setImage:[UIImage imageNamed:@"sign_img_circle_p"] forState:UIControlStateNormal];
                    }
                    break;
                case ResultKindTypeNoEnough:
                    {
                        [[UIColor clearColor] set];
                    }
                    break;
                case ResultKindTypeClear:
                    break;
                default:
                    break;
                }
            }        
        }
    } else {
        [path addLineToPoint:self.currentPoint];
        [[UIColor colorWithRed:94/255.0 green:195/255.0 blue:49/255.0 alpha:0.8] set];
    }
    path.lineWidth = 1;
    path.lineJoinStyle = kCGLineCapRound;
    path.lineCapStyle = kCGLineCapRound;
    [path stroke];
}
ViewController

這個比較容易理解:分別跳轉(zhuǎn)兩個界面:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == 0) {
        TeacViewController *vc = [[TeacViewController alloc] init];
        [self.navigationController pushViewController:vc animated:YES];
    } else {
        StudViewController *vc = [[StudViewController alloc] init];
        [self.navigationController pushViewController:vc animated:YES];
    }
}
TeacViewController
  • 主要的應(yīng)用就是調(diào)用GestureLockViewDelegate了,接受并校驗(yàn)密碼,
#pragma mark gestureLockView代理事件
- (void)gestureLockView:(GestureLockView *)lockView drawRectFinished:(NSMutableString *)gesturePassword {
    [self createGesturesPassword:gesturePassword];
}

//創(chuàng)建手勢密碼
- (void)createGesturesPassword:(NSMutableString *)gesturePassword {
    if (self.lastGesturePsw.length == 0) {
        if (gesturePassword.length < 4) {
            self.lastGesturePsw = nil;
            [self.gestureLockView checkTeacResult:TeacKindTypeNoEnough];
            self.statusLabel.text = @"至少連接4個點(diǎn),重新輸入";
            [self shakeAnimationForView:self.statusLabel];
            return;
        }
        self.lastGesturePsw = gesturePassword;
        [self.gestureLockView checkTeacResult:TeacKindTypeTrue];
        NSLog(@"---%@", self.lastGesturePsw);
        self.statusLabel.text = [NSString stringWithFormat:@"密碼是%@", gesturePassword];
    }
}
  • 兩個按鈕的點(diǎn)擊事件
#pragma mark 按鈕點(diǎn)擊事件
//重置按鈕
- (void)resetBtnClick:(UIButton *)btn {
    self.lastGesturePsw = nil;
    [TeacViewController addGesturePassword:@""];
    [self.gestureLockView checkTeacResult:TeacKindTypeNoEnough];
    self.statusLabel.text = @"請繪制手勢密碼";
    NSLog(@"resetPwd == %@, resetUserDefaultsPwd == %@", self.lastGesturePsw, [TeacViewController gesturePassword]);
}
//確定按鈕
- (void)sureBtnClick:(UIButton *)btn {
    if (!self.lastGesturePsw) {
        self.statusLabel.text = @"請繪制手勢密碼";
        return;
    }
    [TeacViewController addGesturePassword:self.lastGesturePsw];
    [self.gestureLockView checkTeacResult:TeacKindTypeTrue];
    self.statusLabel.text = @"密碼設(shè)置成功";
    NSLog(@"resetPwd == %@, resetUserDefaultsPwd == %@", self.lastGesturePsw, [TeacViewController gesturePassword]);
//    [self.navigationController popViewControllerAnimated:YES];
}

  • 用本地存儲進(jìn)行模擬
#pragma mark 本地存儲模擬
+ (void)deleteGestuesPassword {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:GESPWD];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

+ (void)addGesturePassword:(NSString *)gesturePassword {
    [[NSUserDefaults standardUserDefaults] setObject:gesturePassword forKey:GESPWD];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

+ (NSString *)gesturePassword {
    return [[NSUserDefaults standardUserDefaults] objectForKey:GESPWD];
}
StudViewController
  • GestureLockDelegate代理方法 并校驗(yàn)對當(dāng)前的手勢密碼和本地存儲的教師端密碼
#pragma mark 手勢密碼界面代理
- (void)gestureLockView:(GestureLockView *)lockView drawRectFinished:(NSMutableString *)gesturePassword {
    [self validateGesturePassword:gesturePassword];
}

//校驗(yàn)手勢密碼
- (void)validateGesturePassword:(NSMutableString *)gesturePassword {
    
    if (gesturePassword.length < 4) {
        self.statusLabel.text = @"至少連接4個點(diǎn),重新輸入";
        [self.gestureLockView checkPwdResult:ResultKindTypeNoEnough];
        [self shakeAnimationForView:self.statusLabel];
        return;
    }
    self.lastGesturePsw = gesturePassword;
    
    
    /*滑完直接校驗(yàn)*/
    NSLog(@"validPwd == %@, validUserDefaultsPwd == %@", self.lastGesturePsw, [StudViewController gesturePassword]);
    static NSInteger errorCount = 5;
    
    if ([self.lastGesturePsw isEqualToString:[StudViewController gesturePassword]]) {
        [self.gestureLockView checkPwdResult:ResultKindTypeTrue];
        self.statusLabel.text = @"密碼校驗(yàn)成功";
        [self shakeAnimationForView:self.statusLabel];
    } else {
        [self.gestureLockView checkPwdResult:ResultKindTypeFalse];
        errorCount = errorCount - 1;
        if (errorCount == 0) {
            //已經(jīng)輸錯5次
            self.statusLabel.text = @"請重新輸入密碼";
            errorCount = 5;
            return;
        }
        self.statusLabel.text = [NSString stringWithFormat:@"密碼錯誤, 還可以再輸入%ld次", errorCount];
        [self shakeAnimationForView:self.statusLabel];
    }
}

  • 清除按鈕點(diǎn)擊事件 改變self.gestureLockView中的resultType 進(jìn)行界面的重繪等調(diào)整
- (void)clearBtnClick:(UIButton *)btn {
    self.statusLabel.text = @"清除!!!";
    [self.gestureLockView checkPwdResult:ResultKindTypeClear];
    [self shakeAnimationForView:self.statusLabel];
}
  • 本地存儲:這里也有一個本地存儲 和教師端對應(yīng) (其實(shí)可以單獨(dú)封裝出來的)
#pragma mark 本地存儲模擬
+ (void)deleteGestuesPassword {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:GESPWD];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

+ (void)addGesturePassword:(NSString *)gesturePassword {
    [[NSUserDefaults standardUserDefaults] setObject:gesturePassword forKey:GESPWD];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

+ (NSString *)gesturePassword {
    return [[NSUserDefaults standardUserDefaults] objectForKey:GESPWD];
}

以上,就是這個功能實(shí)現(xiàn)的大體流程了,捋順了思路來看其實(shí)還是蠻明確的,當(dāng)時做的時候也是走路挖坑填坑的,發(fā)現(xiàn)這樣把自己的思路寫下來還真是蠻有收獲的,希望自己更好的進(jìn)步,如果您看到這兒覺得有不合理的地方歡迎隨時和我溝通哈。
源代碼連接:https://github.com/irembeu/LGJGestureLockDemo.git

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