iOS每个应用都要做注册和登录这块,我把手机号和密码的验证代码附上。供参考。
69FA5925-88D0-4102-BF4D-937D10B102E2.png判断一共有两种方法
- UITextField 的Target事件,因为UITextField继承自UIControl,事件类型为UIControlEventEditingChanged。
[verifyNumberTextField addTarget:self action:@selector(verifyNumberTextFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
- UITextField的代理方法UITextFieldDelegate。
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
详细代码如下
1、头文件
@interface LoginViewController ()<UITextFieldDelegate>
@property(nonatomic,strong)UITextField *phoneNumberTextField;
@property(nonatomic,strong)UITextField *passwordTextField;
@property(nonatomic,strong)UILabel *phoneText;
@property(nonatomic,strong)UILabel *pwdText;
@property(nonatomic,strong)UIButton *loginBtn;
@end
2、源文件
- (void)initSubViews {
UITextField *phoneNumber = [[UITextField alloc]init];
phoneNumber.placeholder = @"输入手机号";
phoneNumber.keyboardType = UIKeyboardTypeNumberPad;
phoneNumber.clearButtonMode = UITextFieldViewModeWhileEditing;
[phoneNumber setValue:KRGBColor(79, 79, 79) forKeyPath:@"_placeholderLabel.textColor"];
[phoneNumber setValue:[UIFont systemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];
phoneNumber.borderStyle = UITextBorderStyleRoundedRect;
phoneNumber.delegate = self;
[phoneNumber addTarget:self action:@selector(phoneNumberTextFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
[self.view addSubview:phoneNumber];
self.phoneNumberTextField = phoneNumber;
[phoneNumber mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(20);
make.right.mas_equalTo(-20);
make.height.mas_equalTo(30);
make.top.mas_equalTo(40);
}];
UILabel *phoneText = [[UILabel alloc]init];
phoneText.hidden = YES;
phoneText.text = @"请输入正确手机号";
phoneText.font = [UIFont systemFontOfSize:10];
phoneText.textColor = [UIColor redColor];
self.phoneText = phoneText;
[self.view addSubview:phoneText];
[phoneText mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(phoneNumber);
make.top.mas_equalTo(phoneNumber.mas_bottom);
}];
UITextField *password = [[UITextField alloc]init];
password.placeholder = @"输入密码";
password.clearButtonMode = UITextFieldViewModeWhileEditing;
[password setValue:KRGBColor(79, 79, 79) forKeyPath:@"_placeholderLabel.textColor"];
[password setValue:[UIFont systemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];
password.borderStyle = UITextBorderStyleRoundedRect;
password.secureTextEntry = YES;
[self.view addSubview:password];
password.delegate = self;
[password addTarget:self action:@selector(passwordTextFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
self.passwordTextField = password;
[password mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(20);
make.right.mas_equalTo(-20);
make.height.mas_equalTo(30);
make.top.mas_equalTo(phoneNumber.mas_bottom).offset(20);
}];
UILabel *pwdDetailLable = [[UILabel alloc]init];
pwdDetailLable.text = @"6-16位";
pwdDetailLable.font = [UIFont systemFontOfSize:12];
[self.view addSubview:pwdDetailLable];
[pwdDetailLable mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(password).offset(2);
make.top.mas_equalTo(password.mas_bottom);
}];
UILabel *pwdText = [[UILabel alloc]init];
pwdText.hidden = YES;
pwdText.text = @"请输入6-16位密码";
pwdText.font = [UIFont systemFontOfSize:10];
pwdText.textColor = [UIColor redColor];
self.pwdText = pwdText;
[self.view addSubview:pwdText];
[pwdText mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(password);
make.top.mas_equalTo(pwdDetailLable.mas_bottom);
}];
UIButton *forgetpwdBtn = [[UIButton alloc]init];
[forgetpwdBtn setTitle:@"忘记密码" forState:UIControlStateNormal];
forgetpwdBtn.titleLabel.font = [UIFont systemFontOfSize:12];
[forgetpwdBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[self.view addSubview:forgetpwdBtn];
[forgetpwdBtn addTarget:self action:@selector(forgetpwdBtnAction) forControlEvents:UIControlEventTouchUpInside];
[forgetpwdBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(password.mas_bottom).offset(5);
make.right.mas_equalTo(password);
}];
UIButton *loginBtn = [[UIButton alloc]init];
loginBtn.enabled = NO;
[loginBtn setTitle:@"登录" forState:UIControlStateNormal];
loginBtn.layer.cornerRadius = 5;
loginBtn.layer.masksToBounds = YES;
loginBtn.backgroundColor = ColorWithBlue;
[loginBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[self.view addSubview:loginBtn];
[loginBtn addTarget:self action:@selector(loginBtnAction) forControlEvents:UIControlEventTouchUpInside];
self.loginBtn = loginBtn;
[loginBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(20);
make.right.mas_equalTo(-20);
make.height.mas_equalTo(30);
make.top.mas_equalTo(forgetpwdBtn.mas_bottom).offset(20);
}];
}
#pragma mark- 手机号输入框的事件
- (void)phoneNumberTextFieldDidChange:(UITextField *)textField{
if (textField.text.length == 11) {
self.phoneText.hidden = YES;
}
if (textField.text.length > 11) {
textField.text = [textField.text substringToIndex:11];
}
if (self.passwordTextField.text.length != 0 &&self.passwordTextField.text.length<6) {
self.pwdText.hidden = NO;
}
//验证登录按钮的可用与否
if (textField.text.length == 11 && self.passwordTextField.text.length > 5) {
self.loginBtn.enabled = YES;
}else{
self.loginBtn.enabled = NO;
}
}
#pragma mark- 密码输入框的事件
- (void)passwordTextFieldDidChange:(UITextField *)textField{
if (textField.text.length > 5) {
self.pwdText.hidden = YES;
}
if (textField.text.length > 16) {
textField.text = [textField.text substringToIndex:16];
}
if (self.phoneNumberTextField.text.length != 11) {
self.phoneText.hidden = NO;
}
//验证登录按钮的可用与否
if (self.phoneNumberTextField.text.length == 11 && textField.text.length > 5) {
self.loginBtn.enabled = YES;
}else{
self.loginBtn.enabled = NO;
}
}
@end
第二种代理方法实现
#pragma mark- UITextFieldDelegate
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
// 1.当前完整的内容
NSString *text = textField.text;
if (range.length == 0) {
// 当前是添加内容
text = [text stringByAppendingString:string];
} else {
text = [text substringToIndex:text.length - 1];
}
// 2.如果当前编辑的是用户名文本
if (textField == _phoneNumberTextField) {
if (text.length == 11 && _passwordTextField.text.length >= 6) {
_loginBtn.enabled = YES;
} else {
_loginBtn.enabled = NO;
}
} else if (textField == _passwordTextField) {
if (text.length >= 6 && _phoneNumberTextField.text.length == 11) {
_loginBtn.enabled = YES;
} else {
_loginBtn.enabled = NO;
}
}
// 3.限制文本长度
if (textField == _passwordTextField) {
return range.location <= 16;
} else {
return range.location <= 10;
}
}
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