所以我一直在研究如何将登录视图控制器作为初始视图控制器而不是拆分视图。
我见过的一些答案会推荐加载模式视图？我不确定这是如何设置的。
例如。
如何在 UISplitViewController iPad 之前添加登录视图
和
那么我应该在 loginviewcontroller 类中添加它们吗？还是在哪里？
欢迎任何建议。
谢谢！！
问问题
1787 次
2 回答
4
我通过创建两个故事板来做到这一点：一个带有（全屏）登录，一个带有拆分视图。
为了在它们之间切换，我添加了一个自定义协议：
#import <Foundation/Foundation.h>
@protocol RootViewControllerDelegate <NSObject>
-(void)switchToStoryboard: (UIStoryboard *) storyboad animationDirectionOrNil: (NSString *)direction;
@end
AppDelegate 然后实现这个协议：
-(void)switchToStoryboard:(id)storyboad animationDirectionOrNil:(NSString *)direction {
UIViewController *newRoot=[storyboad instantiateInitialViewController];
if ([newRoot respondsToSelector:@selector(setRootViewControllerDelegate:)]) {
[newRoot setRootViewControllerDelegate:self];
}
self.window.rootViewController=newRoot;
if(direction){
CATransition* transition=[CATransition animation];
transition.type=kCATransitionPush;
transition.subtype=direction;
[self.window.layer addAnimation:transition forKey:@"push_transition"];
}
}
如您所见，它再次尝试将自己设置为委托，因此其他视图控制器可以切换回或切换到另一个情节提要。为了让它工作，你必须继承 UISplitView：
标题
#import <UIKit/UIKit.h>
#import "RootViewControllerDelegate.h"
@interface MySplitViewController : UISplitViewController
@property (nonatomic, weak) id <RootViewControllerDelegate> rootViewControllerDelegate;
@end
执行
#import "MySplitViewController.h"
@implementation MySplitViewController
@synthesize rootViewControllerDelegate;
- (void)viewDidLoad
{
[super viewDidLoad];
for (UIViewController *viewController in self.viewControllers) {
if ([viewController respondsToSelector:@selector(setRootViewControllerDelegate:)]) {
[viewController setRootViewControllerDelegate:self.rootViewControllerDelegate];
}
}
}
@end
这个简单的实现寻找接受根视图控制器委托的子视图控制器并将其传递下来。因此，当您想向某个（主或详细）视图添加“显示登录”按钮时，只需创建自己的 UIViewController 子类，添加一个@property id<RootViewControllerDelegate> rootViewControllerDelegate并将这样的操作与按钮相关联：
- (IBAction)loginButtonClicked:(id)sender {
UIStoryboard *mainSB=[UIStoryboard storyboardWithName:@"LoginStoryboard" bundle:nil];
NSString *animationDirection=kCATransitionFromTop;
UIDeviceOrientation currentOrientation=[[UIDevice currentDevice] orientation];
if (currentOrientation==UIDeviceOrientationLandscapeLeft) {
animationDirection=kCATransitionFromBottom;
}
[self.rootViewControllerDelegate switchToStoryboard:mainSB animationDirectionOrNil:animationDirection];
}
随意调整一切以满足您的需求。
于 2013-02-06T12:00:11.507 回答
1
好吧，这是我的朋友。我在 btn 中创建了一个 ibaction，并使用故事板的模态选项推送了新视图。他们我插入了登录视图的类，它还引用了保持记录海峡的常量。然后在识别登录后，我推送了一个新视图。请记住，我让用户在他们的设备中创建密码，而不是从服务器导入密码。如果你想从服务器导入它会有所不同。
这是登录.h
#import <UIKit/UIKit.h>
#import "Constants.h"
@interface LogInViewController : UIViewController<UITextFieldDelegate>
@property (nonatomic) BOOL pinValidated;
@end
这是 login .m 的代码
#import "LogInViewController.h"
#import "KeychainWrapper.h"
@interface LogInViewController ()
@end
@implementation LogInViewController
@synthesize pinValidated;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
// Helper method to congregate the Name and PIN fields for validation.
- (BOOL)credentialsValidated
{
NSString *name = [[NSUserDefaults standardUserDefaults] stringForKey:USERNAME];
BOOL pin = [[NSUserDefaults standardUserDefaults] boolForKey:PIN_SAVED];
if (name && pin) {
return YES;
} else {
return NO;
}
}
- (void)presentAlertViewForPassword
{
// 1
BOOL hasPin = [[NSUserDefaults standardUserDefaults] boolForKey:PIN_SAVED];
// 2
if (hasPin) {
// 3
NSString *user = [[NSUserDefaults standardUserDefaults] stringForKey:USERNAME];
NSString *message = [NSString stringWithFormat:@"What is %@'s password?", user];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Enter Password"
message:message
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Done", nil];
// 4
[alert setAlertViewStyle:UIAlertViewStyleSecureTextInput]; // Gives us the password field
alert.tag = kAlertTypePIN;
// 5
UITextField *pinField = [alert textFieldAtIndex:0];
pinField.delegate = self;
pinField.autocapitalizationType = UITextAutocapitalizationTypeWords;
pinField.tag = kTextFieldPIN;
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Setup Credentials"
message:@"Enter Your information!"
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Done", nil];
// 6
[alert setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];
alert.tag = kAlertTypeSetup;
UITextField *nameField = [alert textFieldAtIndex:0];
nameField.autocapitalizationType = UITextAutocapitalizationTypeWords;
nameField.placeholder = @"Name"; // Replace the standard placeholder text with something more applicable
nameField.delegate = self;
nameField.tag = kTextFieldName;
UITextField *passwordField = [alert textFieldAtIndex:1]; // Capture the Password text field since there are 2 fields
passwordField.delegate = self;
passwordField.tag = kTextFieldPassword;
[alert show];
}
}
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (alertView.tag == kAlertTypePIN) {
if (buttonIndex == 1 && self.pinValidated) { // User selected "Done"
[self performSegueWithIdentifier:@"ScoutSegue" sender:self];
self.pinValidated = NO;
} else { // User selected "Cancel"
[self presentAlertViewForPassword];
}
} else if (alertView.tag == kAlertTypeSetup) {
if (buttonIndex == 1 && [self credentialsValidated]) { // User selected "Done"
[self performSegueWithIdentifier:@"ScoutSegue" sender:self];
} else { // User selected "Cancel"
[self presentAlertViewForPassword];
}
}
}
#pragma mark - Text Field + Alert View Methods
- (void)textFieldDidEndEditing:(UITextField *)textField
{
// 1
switch (textField.tag) {
case kTextFieldPIN: // We go here if this is the 2nd+ time used (we've already set a PIN at Setup).
NSLog(@"User entered PIN to validate");
if ([textField.text length] > 0) {
// 2
NSUInteger fieldHash = [textField.text hash]; // Get the hash of the entered PIN, minimize contact with the real password
// 3
if ([KeychainWrapper compareKeychainValueForMatchingPIN:fieldHash]) { // Compare them
NSLog(@"** User Authenticated!!");
self.pinValidated = YES;
} else {
NSLog(@"** Wrong Password :(");
self.pinValidated = NO;
}
}
break;
case kTextFieldName: // 1st part of the Setup flow.
NSLog(@"User entered name");
if ([textField.text length] > 0) {
[[NSUserDefaults standardUserDefaults] setValue:textField.text forKey:USERNAME];
[[NSUserDefaults standardUserDefaults] synchronize];
}
break;
case kTextFieldPassword: // 2nd half of the Setup flow.
NSLog(@"User entered PIN");
if ([textField.text length] > 0) {
NSUInteger fieldHash = [textField.text hash];
// 4
NSString *fieldString = [KeychainWrapper securedSHA256DigestHashForPIN:fieldHash];
NSLog(@"** Password Hash - %@", fieldString);
// Save PIN hash to the keychain (NEVER store the direct PIN)
if ([KeychainWrapper createKeychainValue:fieldString forIdentifier:PIN_SAVED]) {
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:PIN_SAVED];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(@"** Key saved successfully to Keychain!!");
}
}
break;
default:
break;
}
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
self.pinValidated = NO;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self presentAlertViewForPassword];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
这是常量的代码
// Used for saving to NSUserDefaults that a PIN has been set, and is the unique identifier for the Keychain.
#define PIN_SAVED @"hasSavedPIN"
// Used for saving the user's name to NSUserDefaults.
#define USERNAME @"username"
// Used to specify the application used in accessing the Keychain.
#define APP_NAME [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleIdentifier"]
// Used to help secure the PIN.
// Ideally, this is randomly generated, but to avoid the unnecessary complexity and overhead of storing the Salt separately, we will standardize on this key.
// !!KEEP IT A SECRET!!
#define SALT_HASH @"FvTivqTqZXsgLLx1v3P8TGRyVHaSOB1pvfm02wvGadj7RLHV8GrfxaZ84oGA8RsKdNRpxdAojXYg9iAj"
// Typedefs just to make it a little easier to read in code.
typedef enum {
kAlertTypePIN = 0,
kAlertTypeSetup
} AlertTypes;
typedef enum {
kTextFieldPIN = 1,
kTextFieldName,
kTextFieldPassword
} TextFieldTypes;
这是钥匙串包装器
#import <Foundation/Foundation.h>
#import <Security/Security.h>
#import <CommonCrypto/CommonHMAC.h>
@interface KeychainWrapper : NSObject
// Generic exposed method to search the keychain for a given value. Limit one result per search.
+ (NSData *)searchKeychainCopyMatchingIdentifier:(NSString *)identifier;
// Calls searchKeychainCopyMatchingIdentifier: and converts to a string value.
+ (NSString *)keychainStringFromMatchingIdentifier:(NSString *)identifier;
// Simple method to compare a passed in hash value with what is stored in the keychain.
// Optionally, we could adjust this method to take in the keychain key to look up the value.
+ (BOOL)compareKeychainValueForMatchingPIN:(NSUInteger)pinHash;
// Default initializer to store a value in the keychain.
// Associated properties are handled for you - setting Data Protection Access, Company Identifer (to uniquely identify string, etc).
+ (BOOL)createKeychainValue:(NSString *)value forIdentifier:(NSString *)identifier;
// Updates a value in the keychain. If you try to set the value with createKeychainValue: and it already exists,
// this method is called instead to update the value in place.
+ (BOOL)updateKeychainValue:(NSString *)value forIdentifier:(NSString *)identifier;
// Delete a value in the keychain.
+ (void)deleteItemFromKeychainWithIdentifier:(NSString *)identifier;
// Generates an SHA256 (much more secure than MD5) hash.
+ (NSString *)securedSHA256DigestHashForPIN:(NSUInteger)pinHash;
+ (NSString*)computeSHA256DigestForString:(NSString*)input;
@end
最后是 keychainwrapper .m 的代码
#import "KeychainWrapper.h"
#import "Constants.h"
@implementation KeychainWrapper
// *** NOTE *** This class is ARC compliant - any references to CF classes must be paired with a "__bridge" statement to
// cast between Objective-C and Core Foundation Classes. WWDC 2011 Video "Introduction to Automatic Reference Counting" explains this.
// *** END NOTE ***
+ (NSMutableDictionary *)setupSearchDirectoryForIdentifier:(NSString *)identifier {
// Setup dictionary to access keychain.
NSMutableDictionary *searchDictionary = [[NSMutableDictionary alloc] init];
// Specify we are using a password (rather than a certificate, internet password, etc).
[searchDictionary setObject:( id)kSecClassGenericPassword forKey:( id)kSecClass];
// Uniquely identify this keychain accessor.
[searchDictionary setObject:APP_NAME forKey:( id)kSecAttrService];
// Uniquely identify the account who will be accessing the keychain.
NSData *encodedIdentifier = [identifier dataUsingEncoding:NSUTF8StringEncoding];
[searchDictionary setObject:encodedIdentifier forKey:( id)kSecAttrGeneric];
[searchDictionary setObject:encodedIdentifier forKey:( id)kSecAttrAccount];
return searchDictionary;
}
+ (NSData *)searchKeychainCopyMatchingIdentifier:(NSString *)identifier
{
NSMutableDictionary *searchDictionary = [self setupSearchDirectoryForIdentifier:identifier];
// Limit search results to one.
[searchDictionary setObject:( id)kSecMatchLimitOne forKey:( id)kSecMatchLimit];
// Specify we want NSData/CFData returned.
[searchDictionary setObject:( id)kCFBooleanTrue forKey:( id)kSecReturnData];
// Search.
NSData *result = nil;
CFTypeRef foundDict = NULL;
OSStatus status = SecItemCopyMatching(( CFDictionaryRef)searchDictionary, &foundDict);
if (status == noErr) {
result = ( NSData *)foundDict;
} else {
result = nil;
}
return result;
}
+ (NSString *)keychainStringFromMatchingIdentifier:(NSString *)identifier
{
NSData *valueData = [self searchKeychainCopyMatchingIdentifier:identifier];
if (valueData) {
NSString *value = [[NSString alloc] initWithData:valueData
encoding:NSUTF8StringEncoding];
return value;
} else {
return nil;
}
}
+ (BOOL)createKeychainValue:(NSString *)value forIdentifier:(NSString *)identifier
{
NSMutableDictionary *dictionary = [self setupSearchDirectoryForIdentifier:identifier];
NSData *valueData = [value dataUsingEncoding:NSUTF8StringEncoding];
[dictionary setObject:valueData forKey:( id)kSecValueData];
// Protect the keychain entry so it's only valid when the device is unlocked.
[dictionary setObject:( id)kSecAttrAccessibleWhenUnlocked forKey:( id)kSecAttrAccessible];
// Add.
OSStatus status = SecItemAdd(( CFDictionaryRef)dictionary, NULL);
// If the addition was successful, return. Otherwise, attempt to update existing key or quit (return NO).
if (status == errSecSuccess) {
return YES;
} else if (status == errSecDuplicateItem){
return [self updateKeychainValue:value forIdentifier:identifier];
} else {
return NO;
}
}
+ (BOOL)updateKeychainValue:(NSString *)value forIdentifier:(NSString *)identifier
{
NSMutableDictionary *searchDictionary = [self setupSearchDirectoryForIdentifier:identifier];
NSMutableDictionary *updateDictionary = [[NSMutableDictionary alloc] init];
NSData *valueData = [value dataUsingEncoding:NSUTF8StringEncoding];
[updateDictionary setObject:valueData forKey:( id)kSecValueData];
// Update.
OSStatus status = SecItemUpdate(( CFDictionaryRef)searchDictionary,
( CFDictionaryRef)updateDictionary);
if (status == errSecSuccess) {
return YES;
} else {
return NO;
}
}
+ (void)deleteItemFromKeychainWithIdentifier:(NSString *)identifier
{
NSMutableDictionary *searchDictionary = [self setupSearchDirectoryForIdentifier:identifier];
CFDictionaryRef dictionary = ( CFDictionaryRef)searchDictionary;
//Delete.
SecItemDelete(dictionary);
}
+ (BOOL)compareKeychainValueForMatchingPIN:(NSUInteger)pinHash
{
if ([[self keychainStringFromMatchingIdentifier:PIN_SAVED] isEqualToString:[self securedSHA256DigestHashForPIN:pinHash]]) {
return YES;
} else {
return NO;
}
}
// This is where most of the magic happens (the rest of it happens in computeSHA256DigestForString: method below).
// Here we are passing in the hash of the PIN that the user entered so that we can avoid manually handling the PIN itself.
// Then we are extracting the username that the user supplied during setup, so that we can add another unique element to the hash.
// From there, we mash the user name, the passed-in PIN hash, and the secret key (from ChristmasConstants.h) together to create
// one long, unique string.
// Then we send that entire hash mashup into the SHA256 method below to create a "Digital Digest," which is considered
// a one-way encryption algorithm. "One-way" means that it can never be reverse-engineered, only brute-force attacked.
// The algorthim we are using is Hash = SHA256(Name + Salt + (Hash(PIN))). This is called "Digest Authentication."
+ (NSString *)securedSHA256DigestHashForPIN:(NSUInteger)pinHash
{
// 1
NSString *name = [[NSUserDefaults standardUserDefaults] stringForKey:USERNAME];
name = [name stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// 2
NSString *computedHashString = [NSString stringWithFormat:@"%@%i%@", name, pinHash, SALT_HASH];
// 3
NSString *finalHash = [self computeSHA256DigestForString:computedHashString];
NSLog(@"** Computed hash: %@ for SHA256 Digest: %@", computedHashString, finalHash);
return finalHash;
}
// This is where the rest of the magic happens.
// Here we are taking in our string hash, placing that inside of a C Char Array, then parsing it through the SHA256 encryption method.
+ (NSString*)computeSHA256DigestForString:(NSString*)input
{
const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:input.length];
uint8_t digest[CC_SHA256_DIGEST_LENGTH];
// This is an iOS5-specific method.
// It takes in the data, how much data, and then output format, which in this case is an int array.
CC_SHA256(data.bytes, data.length, digest);
// Setup our Objective-C output.
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
// Parse through the CC_SHA256 results (stored inside of digest[]).
for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) {
[output appendFormat:@"%02x", digest[i]];
}
return output;
}
@end
这是在任何其他视图天气它是视图控制器或任何其他视图（如标签栏等）之前创建登录视图的蓝图。好好看看这组代码并随意修改它们。希望这对你有帮助，我的朋友。代码就在那里，您所要做的就是研究它们并将它们修改为您想要的。快乐编码。
于 2013-02-06T06:15:19.450 回答