简介
- iPhone 5s 开始支持。
- iOS 8.0 开放了Touch ID 的接口。
代码准备
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self inputUserinfo];
}
/// 输入用户信息
- (void)inputUserinfo {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"购买" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"购买", nil];
alertView.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;
[alertView show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSLog(@"%zd", buttonIndex);
if (buttonIndex == 0) {
return;
}
UITextField *usernameText = [alertView textFieldAtIndex:0];
UITextField *pwdText = [alertView textFieldAtIndex:1];
if ([usernameText.text isEqualToString:@"zhang"] && [pwdText.text isEqualToString:@"123"]) {
[self purchase];
} else {
[[[UIAlertView alloc] initWithTitle:@"提示" message:@"用户名或密码错误" delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:nil, nil] show];
}
}
/// 购买
- (void)purchase {
NSLog(@"购买");
}
指纹识别
头文件
#import <LocalAuthentication/LocalAuthentication.h>
判断是否支持指纹识别
// 检查版本
if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {
[self inputUserinfo];
return;
}
// 检查是否支持指纹识别
LAContext *ctx = [[LAContext alloc] init];
if ([ctx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL]) {
NSLog(@"支持指纹识别");
// 异步输入指纹
[ctx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"购买" reply:^(BOOL success, NSError *error) {
NSLog(@"%d %@ %@", success, error, [NSThread currentThread]);
if (success) {
[self purchase];
} else if (error.code == LAErrorUserFallback) {
dispatch_async(dispatch_get_main_queue(), ^{
[self inputUserinfo];
});
}
}];
NSLog(@"come here");
} else {
[self inputUserinfo];
}
错误代号
| 错误 |
描述 |
| LAErrorAuthenticationFailed |
指纹无法识别 |
| LAErrorUserCancel |
用户点击了"取消"按钮 |
| LAErrorUserFallback |
用户取消，点击了"输入密码"按钮 |
| LAErrorSystemCancel |
系统取消，例如激活了其他应用程序 |
| LAErrorPasscodeNotSet |
验证无法启动，因为设备上没有设置密码 |
| LAErrorTouchIDNotAvailable |
验证无法启动，因为设备上没有 Touch ID |
| LAErrorTouchIDNotEnrolled |
验证无法启动，因为没有输入指纹 |
使用 UIAlertController
- (void)inputUserInfo {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"请输入用户名和口令" preferredStyle:UIAlertControllerStyleAlert];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"请输入用户名";
}];
[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"请输入用户密码";
textField.secureTextEntry = YES;
}];
[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
[self dismissViewControllerAnimated:YES completion:nil];
}]];
[alert addAction:[UIAlertAction actionWithTitle:@"购买" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
NSString *username = [alert.textFields[0] text];
NSString *pwd = [alert.textFields[1] text];
if ([username isEqualToString:@"zhang"] && [pwd isEqualToString:@"1"]) {
[self purchase];
} else {
[self showErrorMsg];
}
}]];
[self presentViewController:alert animated:YES completion:nil];
}
- (void)showErrorMsg {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"用户名或密码不正确" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
[self dismissViewControllerAnimated:YES completion:nil];
}]];
[self presentViewController:alert animated:YES completion:nil];
}
- (void)purchase {
NSLog(@"买了");
}
