依赖框架
LocalAuthentication.framework
#import <LocalAuthentication/LocalAuthentication.h>
注意事项
做iOS 8以下版本适配时，务必进行API验证，避免调用相关API引起崩溃。
使用类
LAContext 指纹验证操作对象
代码
#pragma mark - 指纹验证
- (void)authenticateUser
{
//初始化上下文对象
LAContext* context = [[LAContext alloc] init];
//错误对象
NSError* error = nil;
NSString* result = @"Authentication is needed to access your notes.";
//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) {
//验证成功，主线程处理UI
NSLog(@"验证成功");
}
else
{
NSLog(@"%@",error.localizedDescription);
switch (error.code) {
case LAErrorSystemCancel:
{
NSLog(@"切换到其他APP，系统取消验证Touch IDAuthentication was cancelled by the system");
//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 Authentication was cancelled by the user");
//用户取消验证Touch ID
break;
}
case LAErrorUserFallback:
{
NSLog(@"用户选择输入密码User selected to enter custom password");
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
//用户选择输入密码，切换主线程处理
}];
break;
}
default:
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
//其他情况，切换主线程处理
}];
break;
}
}
}
}];
}
else
{
//不支持指纹识别，LOG出错误详情
switch (error.code) {
case LAErrorTouchIDNotEnrolled:
{
NSLog(@"TouchID没登录 TouchID is not enrolled");
break;
}
case LAErrorPasscodeNotSet:
{
NSLog(@"密码没有设置 A passcode has not been set");
break;
}
default:
{
NSLog(@"不支持 TouchID not available");
break;
}
}
NSLog(@"系统错误%@",error.localizedDescription);
}
}
typedef NS_ENUM(NSInteger, LAError)
{
//授权失败
LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed,
//用户取消Touch ID授权
LAErrorUserCancel = kLAErrorUserCancel,
//用户选择输入密码
LAErrorUserFallback = kLAErrorUserFallback,
//系统取消授权(例如其他APP切入)
LAErrorSystemCancel = kLAErrorSystemCancel,
//系统未设置密码
LAErrorPasscodeNotSet = kLAErrorPasscodeNotSet,
//设备Touch ID不可用，例如未打开
LAErrorTouchIDNotAvailable = kLAErrorTouchIDNotAvailable,
//设