0
首先，我是一個完整的noob，所以請在解釋時溫和。我有一個程序在第一個視圖控制器上加載一個網頁（UIWebview）。第一個視圖控制器檢查是否NSUserDefaults包含用戶名的「jdoe1234」。如果是，則加載第一個網頁，如果它有不同的內容，則加載第二個網頁。我也有一個信息按鈕可以翻到第二個視圖控制器。更新兩個視圖控制器之間的NSUserDefaults
在第二個視圖控制器上，用戶可以輸入用戶名和密碼，然後單擊完成按鈕，將其翻轉回第一個控制器視圖。在完成按鈕代碼中，我正在更新NSUserDefaults以包含用戶名和密碼文本框值。
我的問題是當人們翻回到第一個視圖控制器，網頁不刷新與該人剛輸入和保存的值。當我關閉程序並再次打開時，新值正確顯示。我已經搜索並嘗試了不同的例子，但是我無法使其工作。下面列出了我的代碼。我很感激這方面的幫助。
FirstViewController.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface FirstViewController : UIViewController {
IBOutlet UIWebView *loadInitialGradebook;
IBOutlet UILabel *labelUserName;
}
- (IBAction)infoButtonPressed:(id)sender;
-(IBAction)refreshWebView;
@property (nonatomic, retain) UILabel *labelUserName;
@end
FirstViewController.m
#import "FirstViewController.h"
#import "SecondViewController.h"
@implementation UACCHViewController
@synthesize labelUserName;
- (IBAction)infoButtonPressed:(id)sender;
{
SecondViewController *second = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
second.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:second animated:YES];
}
- (IBAction)refreshWebView {
[loadInitialWebView reload];
}
// Start Strip URL of spaces & funky characters
- (NSString *)urlEncodeValue:(NSString *)str
{
NSString *result = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)str, NULL, CFSTR("?=&+"), kCFStringEncodingUTF8);
return [result autorelease];
}
// End Strip URL of spaces & funky characters
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
labelUserName.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"txtFieldUserName"];
// Start Load WebView
if (![[NSUserDefaults standardUserDefaults] objectForKey:@"txtFieldUserName"]) {
[loadInitialWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]]];
}
else {
NSString *post = [NSString stringWithFormat:@"username=%@&password=%@",[self urlEncodeValue:[[NSUserDefaults standardUserDefaults] stringForKey:@"txtFieldUserName"]],[self urlEncodeValue:[[NSUserDefaults standardUserDefaults] stringForKey:@"txtFieldPassWord"]]];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:@"http://www.mysite.com/page.php"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
[loadInitialWebView loadRequest: request];
}
// End Load WebView
[super viewDidLoad];
}
@end
SecondViewController.h
#import <UIKit/UIKit.h>
NSUserDefaults *prefs;
@interface SecondViewController : UIViewController {
IBOutlet UITextField *txtUserName;
IBOutlet UITextField *txtPassWord;
}
@property (nonatomic, retain) UITextField *txtUserName;
@property (nonatomic, retain) UITextField *txtPassWord;
@property (nonatomic, retain) NSUserDefaults *prefs;
- (IBAction)doneButtonPressed:(id)sender;
@end
SecondViewController.m
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@implementation SecondViewController
@synthesize txtUserName;
@synthesize txtPassWord;
@synthesize prefs;
// Start Done Button Pressed
- (IBAction)doneButtonPressed:(id)sender;
{
[self dismissModalViewControllerAnimated:YES];
[prefs setObject:txtUserName.text forKey:@"txtFieldUserName"];
[prefs setObject:txtPassWord.text forKey:@"txtFieldPassWord"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
// End Done Button Pressed
// Start Dismiss the keyboard when a user selects the return key
- (BOOL) textFieldShouldReturn: (UITextField *) theTextField
{
[theTextField resignFirstResponder];
return YES;
}
// End Dismiss the keyboard when a user selects the return key
- (void)viewDidLoad
{
self.prefs = [NSUserDefaults standardUserDefaults];
//Start (Code to set a default username,password)
if (![[NSUserDefaults standardUserDefaults] objectForKey:@"txtFieldUserName"]) {
txtUserName.text = @"jdoe1234";
}
else {
txtUserName.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"txtFieldUserName"];
}
if (![[NSUserDefaults standardUserDefaults] objectForKey:@"txtFieldPassWord"]) {
txtPassWord.text = @"01012011";
}
else {
txtPassWord.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"txtFieldPassWord"];
}
// End (Code to set a default username,password)
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
@end