iOS开发实现TouchID指纹解锁

实现过程

LAContext

localizedFallbackTitle

Enter Password

localizedReason

Touch ID

小结

代码

- (void)authenticateButtonTapped{
LAContext *context = [[LAContext alloc] init];
context.localizedFallbackTitle = @"输入密码";
NSError *error = nil;

if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {

[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:@"您是这设备的所有者吗？"
reply:^(BOOL success, NSError *error) {
if (success) {
dispatch_async (dispatch_get_main_queue(), ^{
//在主线程更新 UI,不然会卡主
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success"
message:@"你是设备主人。"
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
});

}else{

/*
// 用户未提供有效证书,(3次机会失败 --身份验证失败)。
LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,

// 认证被取消,(用户点击取消按钮)。
LAErrorUserCancel           = kLAErrorUserCancel,

// 认证被取消,用户点击回退按钮(输入密码)。
LAErrorUserFallback         = kLAErrorUserFallback,

// 身份验证被系统取消,(比如另一个应用程序去前台,切换到其他 APP)。
LAErrorSystemCancel         = kLAErrorSystemCancel,

// 身份验证无法启动,因为密码在设备上没有设置。
LAErrorPasscodeNotSet       = kLAErrorPasscodeNotSet,

// 身份验证无法启动,因为触摸ID在设备上不可用。
LAErrorTouchIDNotAvailable  = kLAErrorTouchIDNotAvailable,

// 身份验证无法启动,因为没有登记的手指触摸ID。 没有设置指纹密码时。
LAErrorTouchIDNotEnrolled   = kLAErrorTouchIDNotEnrolled,
**/
switch (error.code) {
case LAErrorAuthenticationFailed:
NSLog(@"身份验证失败。");

break;

case LAErrorUserCancel:
NSLog(@"用户点击取消按钮。");

break;

case LAErrorUserFallback:
{
NSLog(@"用户点击输入密码。");
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
//用户选择输入密码，切换主线程处理
}];
break;
}
case LAErrorSystemCancel:
NSLog(@"另一个应用程序去前台");

break;

case LAErrorPasscodeNotSet:
NSLog(@"密码在设备上没有设置");

break;

case LAErrorTouchIDNotAvailable:
NSLog(@"触摸ID在设备上不可用");

break;

case LAErrorTouchIDNotEnrolled:
NSLog(@"没有登记的手指触摸ID。");

break;

default:
{
NSLog(@"Touch ID没配置");
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
//其他情况，切换主线程处理
}];
break;
}
}
}
}];

} else {
dispatch_async (dispatch_get_main_queue(), ^{

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误提示"
message:@"您的设备没有触摸ID."
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
});
}
}

输入密码。

操作流程

iOS8

-(void)

Touch
ID

iOS 9

/// 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) = 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

LAErrorTouchIDLockout

LocalAuthentication.framework

LAErrorAppCancel

LAErrorSystemCancel

LAErrorInvalidContext