iOS动态验证码实现

转载自：https://blog.csdn.net/zwl492454828/article/details/72625002

// AuthcodeView.h

// BSbracelet

// Created by Christopher on 17/5/16.

#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

@end

// AuthcodeView.m

// BSbracelet

// Created by Christopher on 17/5/16.

#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 4

#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

使用

-(void)recordBtnClick:(UIButton *)recordBtn

{

DomodelView = [[UIView alloc]initWithFrame:CGRectMake(0,0,kScreenWidth,kScreenHeight)];

DomodelView.backgroundColor = [UIColor colorWithRed:0.3 green:0.3 blue:0.3 alpha:0.6];

authBgview = [[UIView alloc]initWithFrame:CGRectMake(30, 120, self.view.frame.size.width-60, 220)];

authBgview.backgroundColor = [UIColor whiteColor]; //显示验证码界面

authBgview.layer.cornerRadius = 8;

authBgview.layer.masksToBounds = YES;

authCodeView = [[AuthcodeView alloc] initWithFrame:CGRectMake(10, 10, kScreenWidth-80, 45)];

[authBgview addSubview:authCodeView];

//提示文字

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 65, kScreenWidth-80, 40)];

label.text = @"点击图片换验证码";

label.font = [UIFont systemFontOfSize:15];

label.textColor = [UIColor grayColor];

[authBgview addSubview:label];

//添加输入框

_input = [[UITextField alloc] initWithFrame:CGRectMake(10, 120, kScreenWidth-80, 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;

[authBgview addSubview:_input];

UIButton *closeBtn = [[UIButton alloc] initWithFrame:CGRectMake(10,170, kScreenWidth-80, 40)];

[closeBtn addTarget:self action:@selector(removeview) forControlEvents:UIControlEventTouchUpInside];

closeBtn.backgroundColor = RGBCOLOR(34,151,216);

[closeBtn setTitle: @"关闭" forState: UIControlStateNormal];

[authBgview addSubview:closeBtn];

[DomodelView addSubview:authBgview];

[self.view addSubview:DomodelView];

// InvoiceRecordViewController *InvoiceRecordVc = [[InvoiceRecordViewController alloc] initWithNibName:@"InvoiceRecordViewController" bundle:nil];

// [self.navigationController pushViewController:InvoiceRecordVc animated:YES];

}

#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 compare:authCodeView.authCodeStr options:NSCaseInsensitiveSearch |NSNumericSearch] ==NSOrderedSame)

{

//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];

[DomodelView removeFromSuperview];

InvoiceRecordViewController *InvoiceRecordVc = [[InvoiceRecordViewController alloc] initWithNibName:@"InvoiceRecordViewController" bundle:nil];

[self.navigationController pushViewController:InvoiceRecordVc animated:YES];

}

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;

}

iOS动态验证码实现

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