层级关系
验证码输入效果
三、实现步骤
代码结构
如图:
1、IDVertificationCodeInputView(编号“1”视图)的的属性
公有属性(vertificationCodeInputView的相关属性)
@interface IDVertificationCodeInputView : UIView/**背景图片*/@property (nonatomic, copy) NSString *backgroudImageName;/**验证码/密码的位数*/@property (nonatomic, assign) NSInteger numberOfVertificationCode;/**控制验证码/密码是否密文显示*/@property (nonatomic, assign) bool secureTextEntry;/**验证码/密码内容,可以通过该属性拿到验证码/密码输入框中验证码/密码的内容*/@property (nonatomic, copy) NSString *vertificationCode;@end私有属性(vertificationCodeInputView的子控件)
@interface IDVertificationCodeInputView () <UITextFieldDelegate>/**用于获取键盘输入的内容,实际不显示*/@property (nonatomic, strong) UITextField *textField;/**验证码/密码输入框的背景图片*/@property (nonatomic, strong) UIImageView *backgroundImageView;/**实际用于显示验证码/密码的label*/@property (nonatomic, strong) IDLabel *label;@end2、IDLabel(编号“4”视图)的属性
@interface IDLabel : UILabel/**验证码/密码的位数*/@property (nonatomic, assign) NSInteger numberOfVertificationCode;/**控制验证码/密码是否密文显示*/@property (nonatomic, assign) bool secureTextEntry;@end3、业务逻辑
- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {// 设置透明背景色,保证vertificationCodeInputView显示的frame为backgroundImageView的frameself.backgroundColor = [UIColor clearColor];// 设置验证码/密码的位数默认为四位self.numberOfVertificationCode = 4;/* 调出键盘的textField */self.textField = [[UITextField alloc] initWithFrame:self.bounds];// 隐藏textField,通过点击IDVertificationCodeInputView使其成为第一响应者,来弹出键盘self.textField.hidden = YES;self.textField.keyboardType = UIKeyboardTypeNumberPad;self.textField.delegate = self;// 将textField放到最后边[self insertSubview:self.textField atIndex:0];/* 添加用于显示验证码/密码的label */self.label = [[IDLabel alloc] initWithFrame:self.bounds];self.label.numberOfVertificationCode = self.numberOfVertificationCode;self.label.secureTextEntry = self.secureTextEntry;self.label.font = self.textField.font;[self addSubview:self.label];}return self;}
- (void)setBackgroudImageName:(NSString *)backgroudImageName {_backgroudImageName = backgroudImageName;// 若用户设置了背景图片,则添加背景图片self.backgroundImageView = [[UIImageView alloc] initWithFrame:self.bounds];self.backgroundImageView.image = [UIImage imageNamed:self.backgroudImageName];// 将背景图片插入到label的后边,避免遮挡验证码/密码的显示[self insertSubview:self.backgroundImageView belowSubview:self.label];}
- (void)setNumberOfVertificationCode:(NSInteger)numberOfVertificationCode {_numberOfVertificationCode = numberOfVertificationCode;// 保持label的验证码/密码位数与IDVertificationCodeInputView一致,此时label一定已经被创建self.label.numberOfVertificationCode = _numberOfVertificationCode;}- (void)setSecureTextEntry:(bool)secureTextEntry {_secureTextEntry = secureTextEntry;self.label.secureTextEntry = _secureTextEntry;}4、弹出键盘,并接收键盘输入的字符
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {[self.textField becomeFirstResponder];}接收键盘输入的字符
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {// 判断是不是“删除”字符if (string.length != 0) {// 不是“删除”字符// 判断验证码/密码的位数是否达到预定的位数if (textField.text.length < self.numberOfVertificationCode) {self.label.text = [textField.text stringByAppendingString:string];self.vertificationCode = self.label.text;return YES;} else {return NO;}} else { // 是“删除”字符self.label.text = [textField.text substringToIndex:textField.text.length - 1];self.vertificationCode = self.label.text;return YES;}}5、绘制验证码/密码(IDLabel)
//重写setText方法,当text改变时手动调用drawRect方法,将text的内容按指定的格式绘制到label上- (void)setText:(NSString *)text {[super setText:text];// 手动调用drawRect方法[self setNeedsDisplay];}绘制验证码/密码
// 按照指定的格式绘制验证码/密码- (void)drawRect:(CGRect)rect {//计算每位验证码/密码的所在区域的宽和高float width = rect.size.width / (float)self.numberOfVertificationCode;;float height = rect.size.height;// 将每位验证码/密码绘制到指定区域for (int i = 0; i < self.text.length; i++) {// 计算每位验证码/密码的绘制区域CGRect tempRect = CGRectMake(i * width, 0, width, height);if (self.secureTextEntry) { // 密码,显示圆点UIImage *dotImage = [UIImage imageNamed:@"dot"];// 计算圆点的绘制区域CGPoint securityDotDrawStartPoint = CGPointMake(width * i + (width - dotImage.size.width) / 2.0, (tempRect.size.height - dotImage.size.height) / 2.0);// 绘制圆点[dotImage drawAtPoint:securityDotDrawStartPoint];} else { // 验证码,显示数字// 遍历验证码/密码的每个字符NSString *charecterString = [NSString stringWithFormat:@"%c", [self.text characterAtIndex:i]];// 设置验证码/密码的现实属性NSMutableDictionary *attributes = [[NSMutableDictionary alloc] init];attributes[NSFontAttributeName] = self.font;// 计算每位验证码/密码的绘制起点(为了使验证码/密码位于tempRect的中部,不应该从tempRect的重点开始绘制)// 计算每位验证码/密码的在指定样式下的sizeCGSize characterSize = [charecterString sizeWithAttributes:attributes];CGPoint vertificationCodeDrawStartPoint = CGPointMake(width * i + (width - characterSize.width) / 2.0, (tempRect.size.height - characterSize.height) / 2.0);// 绘制验证码/密码[charecterString drawAtPoint:vertificationCodeDrawStartPoint withAttributes:attributes];}}}6、使用示例
- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor lightGrayColor];self.vertificationCodeInputView = [[IDVertificationCodeInputView alloc] initWithFrame:CGRectMake(50, 250, 200, 45)];self.vertificationCodeInputView.backgroudImageName = @"1";// 验证码(显示数字)self.vertificationCodeInputView.secureTextEntry = NO;//self.vertificationCodeInputView.secureTextEntry = YES;[self.view addSubview:self.vertificationCodeInputView];}点击屏幕,打印验证码的内容
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {NSLog(@"%@", self.vertificationCodeInputView.vertificationCode);}以上就是本文的全部内容,希望对大家的学习有所帮助。