我正在使用Firebase登录并使用NSUserdefaults保存uid，以便下次自动登录。但不知道为什么它不起作用。以下是我的代码：
// let's say path is the route down to "users" in Firebase
@IBAction func loginPressed(sender: AnyObject) {
if let email = emailField.text where email != "", let password = passwordField.text where password != "" {
FIRAuth.auth()?.signInWithEmail(email, password: password, completion: { (user, err) in
if err != nil {
print(err)
} else {
NSUserDefaults.standardUserDefaults().setValue(user!.uid, forKey: "uid")
path.child("\(user!.uid)/category").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
if let userCategory = snapshot.value as? String {
if userCategory == "seller" {
self.performSegueWithIdentifier(segueSellerVC, sender: self)
} else {
self.performSegueWithIdentifier(segueCustomerVC, sender: self)
}
}
})
}
})
}
}
答案 0 :(得分：3)
Swift 3
保存
#include <stdio.h>
#include <math.h>
#define PI 3.14159265358979323846
#define GRAVITY 9.8
#define ANGLE_RAD45 0.7853981634
typedef struct Artillery
{
char name[30];
float muzzleVelocity;
float minAngleOfElevation;
float maxAngleOfElevation;
}Artillery;
typedef struct Projectile
{
char name[30];
double blastRadius;
}Projectile;
// Function header: artillery struct
void PrintArtillery(Artillery artillery);
// Function header: projectile struct
void PrintProjectile(Projectile projectile);
// Function header: max range
double CalculateRange(double velocity, double angle);
// Function header: deg to rad angle conversion
double AngleDegToRad(double angle);
// Function header: air time
double CalculateAirTime(double velocity, double angle);
// Function header: simulate projectile location
void SimulateProjectile(double* height, double* distance, double time, double velocity, double angle);
int main(void)
{
// Variables
int userValue;
int userValueTwo;
double userTargetDist;
double angleRad;
double userAngle;
double maxRange;
double airTime;
double cannonMaxR = 200;
double howitzMaxR = 900;
double mortarMaxR = 805;
double simHeight; //passive variable
double simDistance;
double simTime;
// Array of 3 weapons
Artillery weapon[3];
// Generate weapons
weapon[0] = (Artillery) { "Cannon", 200, 0, 45 };
weapon[1] = (Artillery) { "Howitzer", 900, 20, 65 };
weapon[2] = (Artillery) { "Mortar", 805, 50, 85 };
// Print title of artillery menu
printf("\n|Artillery Weapon\t|Muzzle Velocity\t|Min Elevation\t\t|Max Elevation\n");
printf("--------------------------------------------------------------------------------\n");
int i;
for(i = 0; i < 3; i++)
{
PrintArtillery(weapon[i]);
}
printf("Please select an artillery weapon (1, 2 or 3)\n");
scanf("%i", &userValue);
while(userValue < 1 || userValue > 3)
{
printf("Input is invalid\nPlease use the appropriate values to select your gun (1, 2, 3)\n");
scanf("%i", &userValue);
fflush(stdin);
}
// Array of 3 shells
Projectile ammoType[3];
// Generate ammo types
ammoType[0] = (Projectile) { "High Explosive Anti-Tank", 5 };
ammoType[1] = (Projectile) { "M549 HERA ", 15 };
ammoType[2] = (Projectile) { "W19 Katie AFAP ", 4200 };
// Print title of projectile menu
printf("\n|Projectile Shell\t\t|Blast Radius\n");
printf("-------------------------------------------\n");
// Loop data
int ii;
for(ii = 0; ii < 3; ii++)
{
PrintProjectile(ammoType[ii]);
}
// Ask user to selection shell
printf("Please select a shell (1, 2 or 3)\n");
scanf("%i", &userValueTwo);
// Apply warning when input is invalid
while(userValueTwo < 1 || userValueTwo > 3)
{
printf("Input is invalid\nPlease use the appropriate values to select your shell (1, 2, 3)\n");
scanf("%i", &userValueTwo);
fflush(stdin);
}
// HOW DO I USE USER'S TARGETDIST TO SHOW HIT OR MISS AT THE END OF SIMULATION???
// Ask user for distance to target in m
printf("Please enter the distance to the target in metres\n");
scanf("%lf", &userTargetDist);
// Make decisions after verified user's inputs
switch(userValue)
{
case 1:
// Start calc after verified ans
// Run max range func (tells max range of gun)
maxRange = CalculateRange(mortarMaxR, angleRad);
// Print instructions
printf("Please enter the angle of elevation in degrees\n");
scanf("%lf", &userAngle);
// Validate user input
while(userAngle < 0 || userAngle > 45)
{
printf("Input is invalid\nThe angle of elevation must be between 50.00 to 85.00 degrees\n");
scanf("%lf", &userAngle);
fflush(stdin);
continue;
}
// Start calc after verified answers
if(userAngle > 0 || userAngle < 45)
{
// Run deg to rad angle conversion func
angleRad = AngleDegToRad(userAngle);
// Run air time func
airTime = CalculateAirTime(mortarMaxR, angleRad);
// Sim loop starts here (track proj location)
for(simTime = 1; simTime <= airTime; simTime++)
{
SimulateProjectile(&simHeight, &simDistance, simTime, mortarMaxR, angleRad);
}
// Print total distance travelled & total air time
printf("The projectile has hit ground level!\nTotal distance travelled: %f\nTotal air time: %f\n", simDistance, airTime);}
break;
case 2:
// Run max range func (tells max range of gun)
maxRange = CalculateRange(howitzMaxR, angleRad);
// Print instructions
printf("Please enter the angle of elevation in degrees\n");
scanf("%lf", &userAngle);
// Validate user input
while(userAngle < 20 || userAngle > 65)
{
printf("Input is invalid\nThe angle of elevation must be between 20.00 to 65.00 degrees\n");
scanf("%lf", &userAngle);
fflush(stdin);
continue;
}
// Start calc after verified answers
if(userAngle > 20 || userAngle < 65)
{
// Run deg to rad angle conversion func
angleRad = AngleDegToRad(userAngle);
// Run air time func
airTime = CalculateAirTime(howitzMaxR, angleRad);
// Sim loop starts here (track proj location)
for(simTime = 1; simTime <= airTime; simTime++)
{
SimulateProjectile(&simHeight, &simDistance, simTime, howitzMaxR, angleRad);
}
// Print total distance travelled & total air time
printf("The projectile has hit ground level!\nTotal distance travelled: %f\nTotal air time: %f\n", simDistance, airTime);
}
break;
case 3:
// Run max range func (tells max range of gun)
maxRange = CalculateRange(mortarMaxR, angleRad);
// Print instructions
printf("Please enter the angle of elevation in degrees\n");
scanf("%lf", &userAngle);
// Validate user input
while(userAngle < 50 || userAngle > 85)
{
printf("Input is invalid\nThe angle of elevation must be between 50.00 to 85.00 degrees\n");
scanf("%lf", &userAngle);
fflush(stdin);
continue;
}
// Start calc after verified answers
if(userAngle > 50 || userAngle < 85)
{
// Run deg to rad angle conversion func
angleRad = AngleDegToRad(userAngle);
// Run air time func
airTime = CalculateAirTime(mortarMaxR, angleRad);
// Sim loop starts here (track proj location)
for(simTime = 1; simTime <= airTime; simTime++)
{
SimulateProjectile(&simHeight, &simDistance, simTime, mortarMaxR, angleRad);
}
// Print total distance travelled & total air time
printf("The projectile has hit ground level!\nTotal distance travelled: %f\nTotal air time: %f\n", simDistance, airTime);
}
break;
}
return 0;
}
//-----FUNCTION CALCULATIONS-----//
// Function calculation: artillery struct
void PrintArtillery(Artillery artillery)
{
// Print variables of artillery menu
printf("|%s \t\t|%f m/s\t\t\|%f deg\t\t\t|%f deg\t\n\n", artillery.name,
artillery.muzzleVelocity,
artillery.minAngleOfElevation,
artillery.maxAngleOfElevation);
}
// Function calculation: projectile struct
void PrintProjectile(Projectile projectile)
{
// Print variables of projectile menu
printf("|%s\t|%lf metres\n\n", projectile.name, projectile.blastRadius);
}
// Function calculation: max range
double CalculateRange(double velocity, double angle)
{
double maxRange;
maxRange = (velocity*velocity/GRAVITY)*sin(2*ANGLE_RAD45);
printf("Maximum range: %.2lf\n", maxRange);
return maxRange;
}
// Function calculation: deg to rad angle conversion
double AngleDegToRad(double angle)
{
double angleRad;
angleRad = angle*(PI/180);
return angleRad;
}
// Function calculation: air time
double CalculateAirTime(double velocity, double angle)
{
double airTime;
airTime = (2*velocity*sin(angle))/GRAVITY;
return airTime;
}
// Function calculation: projectile location sim
void SimulateProjectile(double* height, double* distance, double time, double velocity, double angle)
{
*height = (velocity*time)*sin(angle)-(0.5*GRAVITY*(time*time));
*distance = (velocity*time)*cos(angle);
printf("At %f second(s), height is: %f and distance is: %f\n", time, *height, *distance);
}
检索
UserDefaults.standard.set(FIRAuth.auth()!.currentUser!.uid, forKey: "uid")
UserDefaults.standard.synchronize()
Swift 2
保存
let storagePath = UserDefaults.standard.object(forKey: "uid") as? String
检索
NSUserDefaults.standardUserDefaults().setObject(FIRAuth.auth()!.currentUser!.uid, forKey: "uid")
NSUserDefaults.standardUserDefaults().synchronize()
答案 1 :(得分：0)
Swift 3
UserDefaults.standard.setValue(user!.uid, forKey: "uid")