iOS-仿智联字符图片验证码

项目中有时候会有这种需求: 获取这种 随机字符组成的图片验证码.
随机字符组成的图片验证码, 字符位数可改变, 字符可斜可正排列.

字符图片验证码.png

主要思路:
1.初始化验证码的背景且设置随机色
2.获取验证图上的字符码并通过bolck带回验证码值
3.在背景上添加标签,获取字符随机产生赋值给标签(可斜可正排列)
4.初始化添加验证码视图 并添加手势点击刷新
5.判断验证码字符是否输入正确(区分大小写)

首先 初始化创建验证码背景:ZLSecurityCodeImgView

1. 初始化验证码的背景且设置随机色

初始化背景:

    if (_bgView) {
        [_bgView removeFromSuperview];
    }
    _bgView = [[UIView alloc]initWithFrame:self.bounds];
    [self addSubview:_bgView];
    [_bgView setBackgroundColor:[self getRandomBgColorWithAlpha:0.5]];

产生背景随机色:

- (UIColor *)getRandomBgColorWithAlpha:(CGFloat)alpha {
    
    float red = arc4random() % 100 / 100.0;
    float green = arc4random() % 100 / 100.0;
    float blue = arc4random() % 100 / 100.0;
    UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
    
    return color;
}

2. 获取验证图上的字符码

- (void)changeCodeStr {
    
    // 目前是数字字母
    self.textArr = [[NSArray alloc] initWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z",@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",@"i",@"j",@"k",@"l",@"m",@"n",@"o",@"p",@"q",@"r",@"s",@"t",@"u",@"v",@"w",@"x",@"y",@"z",nil];
    
    for(NSInteger i = 0; i < CodeCount; i++) {
        NSInteger index = arc4random() % ([self.textArr count] - 1);
        NSString *oneText = [self.textArr objectAtIndex:index];
        self.imageCodeStr = (i==0) ? oneText : [self.imageCodeStr stringByAppendingString:oneText];
    }
    // block 块带回验证码值
    if (self.bolck) {
        self.bolck(self.imageCodeStr);
    }
}

其中这个字符CodeCount的个数可以按照自己需求了来修改.

四位斜验证码.png 5位斜字符验证码.png

3. 在背景上添加标签, 获取字符随机产生赋值给标签(可斜可正排列)

 for (int i = 0; i<self.imageCodeStr.length; i++) {
        
        CGFloat px = arc4random()%randWidth + i*(self.frame.size.width-3)/self.imageCodeStr.length;
        CGFloat py = arc4random()%randHeight;
        UILabel * label = [[UILabel alloc] initWithFrame: CGRectMake(px+3, py, textSize.width, textSize.height)];
        label.text = [NSString stringWithFormat:@"%C", [self.imageCodeStr characterAtIndex:i]];
        label.font = [UIFont systemFontOfSize:20];
        
        if (self.isRotation) { // 验证码字符是否需要斜着
            double r = (double)arc4random() / ARC4RAND_MAX * 2 - 1.0f; // 随机-1到1
            if (r > 0.3) {
                r = 0.3;
            }else if(r < -0.3){
                r = -0.3;
            }
            label.transform = CGAffineTransformMakeRotation(r);
        }
        
        [_bgView addSubview:label];
    }

其中这个字符的正斜可以按照自己需求了来修改,这里看下正的:

正验证码截图.png

最后初始化添加验证码视图

4. 初始化添加验证码视图 并添加手势点击刷新

初始化添加验证码视图:

- (void)setupSecurityCodeImgView {
    
    // 验证码背景宽高可根据需求自定义
    _codeImgView = [[ZLSecurityCodeImgView alloc] initWithFrame:CGRectMake(150, 200, 100, 40)];
    _codeImgView.bolck = ^(NSString *imageCodeStr){ // 根据需求是否使用验证码值
        // 打印生成的验证码
        NSLog(@"imageCodeStr = %@", imageCodeStr);
    };
    // 验证码字符是否需要斜着
    _codeImgView.isRotation = YES;
    [_codeImgView refreshSecurityCode];
    [self.view addSubview: _codeImgView];
}

添加手势:

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
    [_codeImgView addGestureRecognizer:tap];

点击刷新:

- (void)tapClick:(UITapGestureRecognizer *)tap {
    
    [_codeImgView refreshSecurityCode];
}

斜验证码图.gif

5. 判断验证码字符是否输入正确(区分大小写)

#pragma mark- UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if (textField == self.codeField) {
        [self.codeField resignFirstResponder];
        
        // 判断验证码字符是否输入正确(区分大小写)
        if ([textField.text isEqualToString:self.imageCodeStr]) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"测试" message:@"匹配成功" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
            }];
            [alert addAction:okAction];
            [self presentViewController:alert animated:YES completion:nil];
        } else {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"测试" message:@"匹配失败" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
            }];
            [alert addAction:okAction];
            [self presentViewController:alert animated:YES completion:nil];
        }
        
    }
    return YES;
}

这时候测试一下效果 :

验证码图.gif