項目中有時候會有這種需求: 獲取這種 隨機字符組成的圖片驗證碼.
隨機字符組成的圖片驗證碼, 字符位數可改變, 字符可斜可正排列.
一、主要思路
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1.初始化驗證碼的背景且設置隨機色
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2.獲取驗證圖上的字符碼並通過bolck帶回驗證碼值
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3.在背景上添加標籤,獲取字符隨機產生賦值給標籤(可斜可正排列)
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4.添加干擾線於背景
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5.初始化添加驗證碼視圖 並添加手勢點擊刷新
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6.判斷驗證碼字符是否輸入正確(區分大小寫)
二、程序實現
首先 初始化創建驗證碼背景:ZLSecurityCodeImgView, 最後初始化添加驗證碼視圖並添加手勢點擊刷新.
1、初始化驗證碼的背景且設置隨機色
初始化背景:
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if (_bgView) { [_bgView removeFromSuperview]; } _bgView = [[UIView alloc]initWithFrame:self.bounds]; [self addSubview:_bgView]; [_bgView setBackgroundColor:[self getRandomBgColorWithAlpha:0.5]]; |
產生背景隨機色:
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- (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、獲取驗證圖上的字符碼並通過bolck帶回驗證碼值
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- ( void )changeCodeStr { // 目前是數字字母 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 塊帶回驗證碼值 if (self.bolck) { self.bolck(self.imageCodeStr); } } |
其中這個字符CodeCount的個數可以按照自己需求了來修改.
四位斜驗證碼:
5位斜字符驗證碼:
3、在背景上添加標籤,獲取字符隨機產生賦值給標籤(可斜可正排列)
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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) { // 驗證碼字符是否需要斜着 double r = ( double )arc4random() / ARC4RAND_MAX * 2 - 1.0f; // 隨機-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]; } |
其中這個字符的正斜可以按照自己需求了來修改,這裏看下正的:
4、添加干擾線於背景
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for ( int i = 0; i<10; i++) { UIBezierPath *path = [UIBezierPath bezierPath]; CGFloat pX = arc4random() % ( int )CGRectGetWidth(self.frame); CGFloat pY = arc4random() % ( int )CGRectGetHeight(self.frame); [path moveToPoint:CGPointMake(pX, pY)]; CGFloat ptX = arc4random() % ( int )CGRectGetWidth(self.frame); CGFloat ptY = arc4random() % ( int )CGRectGetHeight(self.frame); [path addLineToPoint:CGPointMake(ptX, ptY)]; CAShapeLayer *layer = [CAShapeLayer layer]; layer.strokeColor = [[self getRandomBgColorWithAlpha:0.2] CGColor]; // layer的邊框色 layer.lineWidth = 1.0f; layer.strokeEnd = 1; layer.fillColor = [UIColor clearColor].CGColor; layer.path = path.CGPath; [_bgView.layer addSublayer:layer]; } |
5、初始化添加驗證碼視圖 並添加手勢點擊刷新
初始化添加驗證碼視圖:
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- ( void )setupSecurityCodeImgView { // 驗證碼背景寬高可根據需求自定義 _codeImgView = [[ZLSecurityCodeImgView alloc] initWithFrame:CGRectMake(150, 200, 100, 40)]; _codeImgView.bolck = ^(NSString *imageCodeStr){ // 根據需求是否使用驗證碼值 // 打印生成的驗證碼 NSLog(@ "imageCodeStr = %@" , imageCodeStr); }; // 驗證碼字符是否需要斜着 _codeImgView.isRotation = YES; [_codeImgView refreshSecurityCode]; [self.view addSubview: _codeImgView]; } |
添加手勢點擊刷新:
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UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)]; [_codeImgView addGestureRecognizer:tap]; |
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- ( void )tapClick:(UITapGestureRecognizer *)tap { [_codeImgView refreshSecurityCode]; } |
斜驗證碼圖刷新運行效果:
6、判斷驗證碼字符是否輸入正確(區分大小寫)
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#pragma mark- UITextFieldDelegate - ( BOOL )textFieldShouldReturn:(UITextField *)textField { if (textField == self.codeField) { [self.codeField resignFirstResponder]; // 判斷驗證碼字符是否輸入正確(區分大小寫) if ([textField.text isEqualToString:self.imageCodeStr]) { UIAlertController *alert = [UIAlertController alertControllerWithTitle:@ "測試" message:@ "匹配成功" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *okAction = [UIAlertAction actionWithTitle:@ "確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { }]; [alert addAction:okAction]; [self presentViewController:alert animated:YES completion:nil]; } else { UIAlertController *alert = [UIAlertController alertControllerWithTitle:@ "測試" message:@ "匹配失敗" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *okAction = [UIAlertAction actionWithTitle:@ "確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { }]; [alert addAction:okAction]; [self presentViewController:alert animated:YES completion:nil]; } } return YES; } |
這時候整體測試一下效果 :
三、其他補充
1、壓縮文件截圖:
界面性問題可以根據自己項目需求調整即可, 具體可參考代碼, 項目則能夠直接運行!
如需看詳情版,請到這裏下載!