功能需求：登录之后，只要不退出登录，再次进入app时需要验证指纹后进入主页面。
- (void)viewDidLoad {
[super viewDidLoad];
[self showFingerprintVerification];
}
// 指纹验证
- (void)showFingerprintVerification {
// 初始化上下文对象
LAContext *context = [[LAContext alloc] init];
// 错误对象
NSError *error = nil;
NSString *result = @"通过Home键验证已有手机指纹";
// 首先使用canEvaluatePolicy 判断设备支持状态
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
// 支持指纹验证
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:result reply:^(BOOL success, NSError *error) {
if (success) {
NSLog(@"登录成功");
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[[AppDelegate sharedAppDelegate] changeMainRootViewController];
}];
} else {
NSLog(@"%@",error.localizedDescription);
switch (error.code) {
case LAErrorSystemCancel: {
NSLog(@"切换到其他APP，系统取消验证Touch ID");
break;
}
case LAErrorUserCancel: {
NSLog(@"用户取消验证Touch ID");
break;
}
case LAErrorUserFallback: {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
NSLog(@"用户选择输入密码，切换主线程处理");
// 登录页面
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:unLogin forKey:FYLOGINTIMES_Key];
[userDefaults synchronize];
[[AppDelegate sharedAppDelegate] changeRootViewController];
}];
break;
}
case LAErrorTouchIDLockout: { // iOS 9之后才会有的
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
NSLog(@"多次指纹校验失败, 需要输入密码解锁");
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"指纹不匹配" message:nil preferredStyle:UIAlertControllerStyleAlert];
[self presentViewController:alert animated:NO completion:nil];
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 2.0 *NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[alert dismissViewControllerAnimated:YES completion:nil];
});
}];
break;
}
case LAErrorAppCancel: { // iOS 9之后才会有的
NSLog(@"当前app被挂起取消了授权,和LAErrorSystemCancel不太一样");
break;
}
case LAErrorInvalidContext: { // iOS 9之后才会有的
NSLog(@"LAContext对象被释放掉了，造成的授权失败");
break;
}
default: {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
}];
break;
}
}
}
}];
} else {
// 不支持指纹识别，LOG出错误详情
switch (error.code) {
case LAErrorTouchIDNotEnrolled: {
NSLog(@"TouchID is not enrolled");
break;
}
case LAErrorPasscodeNotSet: {
NSLog(@"A passcode has not been set");
break;
}
default: {
NSLog(@"TouchID not available");
break;
}
}
NSLog(@"%@",error.localizedDescription);
}
}
