iOS Touch ID 使用详情

简单介绍:

支持系统和机型

       iOS系统的指纹识别功能最低支持的机型为iPhone 5s，最低支持系统为iOS 8，虽然安装iOS 7系统的5s机型可以使用系统提供的指纹解锁功能，但由于API并未开放，所以理论上第三方软件不可使用。
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

代码实现:

//初始化上下文对象

LAContext* context = [[LAContext alloc] init];    //错误对象
NSError  * error = nil;
NSString * result = @"验证";
context.localizedFallbackTitle = @"123";

//判断设备是否支持touchID
BOOL isSupport = [context canEvaluatePolicy:
LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
if (isSupport) {
//指纹识别函数
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:@"用 Touch ID 登录"
reply:^(BOOL success, NSError *error) {

//如果成功
if (success) {
NSLog(@"验证成功");
}else{
switch (error.code) {
case LAErrorSystemCancel:
{
NSLog(@"Authentication was cancelled by the system");
//切换到其他APP，系统取消验证Touch ID
break;
}
case LAErrorUserCancel:
{
NSLog(@"Authentication was cancelled by the user");
//用户取消验证Touch ID
break;
}
case LAErrorUserFallback:
{
NSLog(@"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;
}
}
}
}];

} else {
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);
}

下面是LAError中每个枚举对应的含义

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,
//设备Touch ID不可用，用户未录入
LAErrorTouchIDNotEnrolled   = kLAErrorTouchIDNotEnrolled,

}