指纹识别: 从iPhone5s开始，苹果手机有了指纹识别功能，而从iOS8.0开始，苹果开放了指纹识别的接口。
简单实现
导入#import <LocalAuthentication/LocalAuthentication.h>
#import <LocalAuthentication/LocalAuthentication.h>
核心代码
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor orangeColor];
//判断系统版本
/*
iPhone5s开始有了指纹识别功能
iOS8开始苹果开放指纹识别接口
*/
if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
//判断是否可用指纹识别功能
//创建上下文
LAContext *context = [[LAContext alloc] init];
//指纹验证失败后 右侧按钮显示文字
context.localizedFallbackTitle = @"验证登录密码";
//判断是否可用
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:nil]) {
//可用
//启动指纹识别功能
//localizedReason: 显示在界面上的原因
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"通过Home键验证已有手机指纹" reply:^(BOOL success, NSError * _Nullable error) {
//判断是否成功
if (success) {
NSLog(@"验证成功");
}else {
NSLog(@"验证失败");
}
//如果区分不同错误来提示用户 必须判断error
if (error) {
NSLog(@"error: %@-----code: %ld-----userInfo: %@", error, error.code, error.userInfo);
}
/*
typedef NS_ENUM(NSInteger, LAError)
{
/// Authentication was not successful, because user failed to provide valid credentials.
LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,
/// Authentication was canceled by user (e.g. tapped Cancel button).
LAErrorUserCancel = kLAErrorUserCancel,
/// Authentication was canceled, because the user tapped the fallback button (Enter Password).
LAErrorUserFallback = kLAErrorUserFallback,
/// Authentication was canceled by system (e.g. another application went to foreground).
LAErrorSystemCancel = kLAErrorSystemCancel,
/// Authentication could not start, because passcode is not set on the device.
LAErrorPasscodeNotSet = kLAErrorPasscodeNotSet,
/// Authentication could not start, because Touch ID is not available on the device.
LAErrorTouchIDNotAvailable = kLAErrorTouchIDNotAvailable,
/// Authentication could not start, because Touch ID has no enrolled fingers.
LAErrorTouchIDNotEnrolled = kLAErrorTouchIDNotEnrolled,
/// Authentication was not successful, because there were too many failed Touch ID attempts and
/// Touch ID is now locked. Passcode is required to unlock Touch ID, e.g. evaluating
/// LAPolicyDeviceOwnerAuthenticationWithBiometrics will ask for passcode as a prerequisite.
LAErrorTouchIDLockout NS_ENUM_AVAILABLE(10_11, 9_0) __WATCHOS_AVAILABLE(3.0) __TVOS_AVAILABLE(10.0) = kLAErrorTouchIDLockout,
/// Authentication was canceled by application (e.g. invalidate was called while
/// authentication was in progress).
LAErrorAppCancel NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorAppCancel,
/// LAContext passed to this call has been previously invalidated.
LAErrorInvalidContext NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorInvalidContext
} NS_ENUM_AVAILABLE(10_10, 8_0) __WATCHOS_AVAILABLE(3.0) __TVOS_AVAILABLE(10.0);
*/
}];
}else {
//不可以使用
NSLog(@"iPhone5s以上机型才可使用指纹识别功能");
}
}else {
NSLog(@"系统版本过低!");
}
}
点击取消按钮输出结果:
[ViewController.m:52行] 验证失败
[ViewController.m:57行] error: Error Domain=com.apple.LocalAuthentication Code=-2 "Canceled by user." UserInfo={NSLocalizedDescription=Canceled by user.}-----code: -2-----userInfo: {
NSLocalizedDescription = "Canceled by user.";
}
故意用错误指纹，第三次错误时输出:
[ViewController.m:52行] 验证失败
[ViewController.m:57行] error: Error Domain=com.apple.LocalAuthentication Code=-1 "Application retry limit exceeded." UserInfo={NSLocalizedDescription=Application retry limit exceeded.}-----code: -1-----userInfo: {
NSLocalizedDescription = "Application retry limit exceeded.";
}
PS: 我用的5s测试的，奇怪的是竟然遇到几次走到了设备不可用判断里(NSLog(@"iPhone5s以上机型才可使用指纹识别功能");)，可是确定手机是货真价实的iPhone5s，支付宝等的指纹识别都可以正常使用。不知道原因，很是无语，不过我用的数据线不是苹果原装的，难道和这个有关系？不解