1>>>导入库#import<LocalAuthentication/LocalAuthentication.h>
2>>>viewDidLoad中做初始化对象和验证是否支持Touch ID解锁的操作：
LAContext* context = [[LAContext alloc] init];
NSError* error = nil;
/*ios 8.0以上才支持
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
}
或者下面*/
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
[self doSomeAuthWith:context];
}
else {//不支持touch ID解锁
NSLog(@"==========Not support :%@", error.description);
}
3>>>自定义的方法doSomeAuthWith:(LAContext *)someThing方法内部做进一步操作和判定
- (void)doSomeAuthWith:(LAContext *)someThing
{
LAContext * myContext = (LAContext *)someThing;
myContext.localizedFallbackTitle = @"输入密码";
NSError *authError = nil;
NSString *myLocalizedReasonString = @"用于解除系统锁定!";
if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError])
{
[myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:myLocalizedReasonString
reply:^(BOOL success, NSError *error) {
if(success)
{
//处理验证通过
NSLog(@"指纹验证通过");
}
else
{
//处理验证失败
NSLog(@"%@",[self getAuthErrorDescription:error.code] );
}
}];
}
else
{
//不支持Touch ID验证，提示用户
}
}
4>>>方法getAuthErrorDescription:(NSInteger)code通过传入错误码返回具体失败原因
- (NSString *)getAuthErrorDescription:(NSInteger)code
{
NSString *msg = @"";
switch (code) {
case LAErrorTouchIDNotEnrolled:
//认证不能开始,因为touch id没有录入指纹.
msg = @"此设备未录入指纹信息!";
break;
case LAErrorTouchIDNotAvailable:
//认证不能开始,因为touch id在此台设备尚是无效的.
msg = @"此设备不支持Touch ID!";
break;
case LAErrorPasscodeNotSet:
//认证不能开始,因为此台设备没有设置密码.
msg = @"未设置密码,无法开启认证!";
break;
case LAErrorSystemCancel:
//认证被系统取消了,例如其他的应用程序到前台了
msg = @"系统取消认证";
break;
case LAErrorUserFallback:
//认证被取消,因为用户点击了fallback按钮(输入密码).
msg = @"选择输入密码!";
break;
case LAErrorUserCancel:
//认证被用户取消,例如点击了cancel按钮.
msg = @"取消认证!";
break;
case LAErrorAuthenticationFailed:
//认证没有成功,因为用户没有成功的提供一个有效的认证资格
msg = @"认证失败!";
break;
default:
break;
}
return msg;
}
