前几天app注册被人攻击了，从网上找了这个先保存下。。。。
用于ios本地动态生成验证码，效果如下：
- 导入CoreGraphics.framework
用于绘制图形
- 封装UIView，便捷使用，代码如下：
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AuthcodeView.h#import <UIKit/UIKit.h>@interface AuthcodeView : UIView@property (strong, nonatomic) NSArray *dataArray;//字符素材数组@property (strong, nonatomic) NSMutableString *authCodeStr;//验证码字符串@endAuthcodeView.m#import "AuthcodeView.h"#define kRandomColor [UIColor colorWithRed:arc4random() % 256 / 256.0 green:arc4random() % 256 / 256.0 blue:arc4random() % 256 / 256.0 alpha:1.0];#define kLineCount 6#define kLineWidth 1.0#define kCharCount 6#define kFontSize [UIFont systemFontOfSize:arc4random() % 5 + 15]@implementation AuthcodeView/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect { // Drawing code}*/- (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.layer.cornerRadius = 5.0f; self.layer.masksToBounds = YES; self.backgroundColor = kRandomColor; [self getAuthcode];//获得随机验证码 } return self;}#pragma mark 获得随机验证码- (void)getAuthcode{ //字符串素材 _dataArray = [[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]; _authCodeStr = [[NSMutableString alloc] initWithCapacity:kCharCount]; //随机从数组中选取需要个数的字符串，拼接为验证码字符串 for (int i = 0; i < kCharCount; i++) { NSInteger index = arc4random() % (_dataArray.count-1); NSString *tempStr = [_dataArray objectAtIndex:index]; _authCodeStr = (NSMutableString *)[_authCodeStr stringByAppendingString:tempStr]; }}#pragma mark 点击界面切换验证码- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ [self getAuthcode]; //setNeedsDisplay调用drawRect方法来实现view的绘制 [self setNeedsDisplay];}- (void)drawRect:(CGRect)rect{ [super drawRect:rect]; //设置随机背景颜色 self.backgroundColor = kRandomColor; //根据要显示的验证码字符串，根据长度，计算每个字符串显示的位置 NSString *text = [NSString stringWithFormat:@"%@",_authCodeStr]; CGSize cSize = [@"A" sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20]}]; int width = rect.size.width/text.length - cSize.width; int height = rect.size.height - cSize.height; CGPoint point; //依次绘制每一个字符,可以设置显示的每个字符的字体大小、颜色、样式等 float pX,pY; for ( int i = 0; i<text.length; i++) { pX = arc4random() % width + rect.size.width/text.length * i; pY = arc4random() % height; point = CGPointMake(pX, pY); unichar c = [text characterAtIndex:i]; NSString *textC = [NSString stringWithFormat:@"%C", c]; [textC drawAtPoint:point withAttributes:@{NSFontAttributeName:kFontSize}]; } //调用drawRect：之前，系统会向栈中压入一个CGContextRef，调用UIGraphicsGetCurrentContext()会取栈顶的CGContextRef CGContextRef context = UIGraphicsGetCurrentContext(); //设置线条宽度 CGContextSetLineWidth(context, kLineWidth); //绘制干扰线 for (int i = 0; i < kLineCount; i++) { UIColor *color = kRandomColor; CGContextSetStrokeColorWithColor(context, color.CGColor);//设置线条填充色 //设置线的起点 pX = arc4random() % (int)rect.size.width; pY = arc4random() % (int)rect.size.height; CGContextMoveToPoint(context, pX, pY); //设置线终点 pX = arc4random() % (int)rect.size.width; pY = arc4random() % (int)rect.size.height; CGContextAddLineToPoint(context, pX, pY); //画线 CGContextStrokePath(context); }}@end |
- 界面添加验证码
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@interface AuthCodeViewController ()<UITextFieldDelegate, UIAlertViewDelegate>{ AuthcodeView *authCodeView; UITextField *_input;}@end@implementation AuthCodeViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.view.backgroundColor = [UIColor whiteColor]; //显示验证码界面 authCodeView = [[AuthcodeView alloc] initWithFrame:CGRectMake(30, 100, self.view.frame.size.width-60, 40)]; [self.view addSubview:authCodeView]; //提示文字 UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 160, self.view.frame.size.width-100, 40)]; label.text = @"点击图片换验证码"; label.font = [UIFont systemFontOfSize:12]; label.textColor = [UIColor grayColor]; [self.view addSubview:label]; //添加输入框 _input = [[UITextField alloc] initWithFrame:CGRectMake(30, 220, self.view.frame.size.width-60, 40)]; _input.layer.borderColor = [UIColor lightGrayColor].CGColor; _input.layer.borderWidth = 2.0; _input.layer.cornerRadius = 5.0; _input.font = [UIFont systemFontOfSize:21]; _input.placeholder = @"请输入验证码!"; _input.clearButtonMode = UITextFieldViewModeWhileEditing; _input.backgroundColor = [UIColor clearColor]; _input.textAlignment = NSTextAlignmentCenter; _input.returnKeyType = UIReturnKeyDone; _input.delegate = self; [self.view addSubview:_input];}#pragma mark 输入框代理，点击return 按钮- (BOOL)textFieldShouldReturn:(UITextField *)textField{ //判断输入的是否为验证图片中显示的验证码 if ([_input.text isEqualToString:authCodeView.authCodeStr]) { //正确弹出警告款提示正确 UIAlertView *alview = [[UIAlertView alloc] initWithTitle:@"恭喜您 ^o^" message:@"验证成功" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [alview show]; } else { //验证不匹配，验证码和输入框抖动 CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.x"]; anim.repeatCount = 1; anim.values = @[@-20,@20,@-20];// [authCodeView.layer addAnimation:anim forKey:nil]; [_input.layer addAnimation:anim forKey:nil]; } return YES;}#pragma mark 警告框中方法-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ //清空输入框内容，收回键盘 if (buttonIndex==0) { _input.text = @""; [_input resignFirstResponder]; }} |
以上所述是小编给大家介绍的iOS本地动态生成验证码的方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/lu_ca/article/details/54089099
