iOS开发之指纹解锁

#import <LocalAuthentication/LocalAuthentication.h>
指纹验证的实现
- (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
}
else
{
NSLog(@"%@",error.localizedDescription);
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:^{
//用户选择其他验证方式，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 is not enrolled");
break;
}
case LAErrorPasscodeNotSet:
{
NSLog(@"A passcode has not been set");
break;
}
default:
{
NSLog(@"TouchID not available");
break;
}
}

NSLog(@"%@",error.localizedDescription);
[self showPasswordAlert];
}  }

对几种情况的说明
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,
} NS_ENUM_AVAILABLE(10_10, 8_0);