Iphone 设备上未显示模式视图

我在iphone应用程序中使用模态视图。问题是这些视图在模拟器上工作，但当我在设备上安装它时，它会显示一个白色的空白屏幕，而不是模式视图。以前有人遇到过这个问题吗？我如何解决这个问题？下面是代码

#import "ResetPWD.h"
#import "WebServiceController.h"
#import "ProductAppDelegate.h"

@implementation ResetPWD

@synthesize oldPWD;
@synthesize newPWD;
@synthesize newPWD2;
@synthesize password1;
@synthesize password2;




-(IBAction)done:(id)sender {


    NSString *pwd = oldPWD.text;
    NSString *pwd1 = newPWD.text;
    NSString *pwd2 = newPWD2.text;



    if(!self.oldPWD.text )
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Please Enter Old Password."
                                                       delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alert show];   
        [alert release];    
        return;
    }

    if(!self.newPWD.text )
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Please Enter New Password."
                                                       delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alert show];   
        [alert release];    
        return;
    }


    if ([pwd1 length]<6) {

        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"New password should be atleast 6 characters long" delegate:self   cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [alert show];
        [alert release];

        return;


    }



    if (![pwd1 isEqualToString:pwd2]) {



        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Passwords do not match" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [alert show];
        [alert release];

        return;         
    }

    password1 = pwd;
    password2 = pwd1;



    NSMutableArray *data = [[NSMutableArray alloc]init];



    [data addObject:password1];
    [data addObject:password2];


    WebServiceController *webCall = [[WebServiceController alloc]init];

    NSDictionary *dict = [webCall resetPWD:data];


    NSString * nVal = [dict objectForKey:@"ErrorCode"];
    NSString *errorDesc = [dict objectForKey:@"ErrorType"];
    NSString *errorString = [dict objectForKey:@"ErrorString"];


    int n=[nVal integerValue];

    if(n>=3)
    {
        errorString=[[NSString alloc]initWithFormat:@"%@\nProceed to broker registration.",errorString];
    }

    UIAlertView *successAlert=[[UIAlertView alloc]initWithTitle:errorDesc message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

    [successAlert show];
    [successAlert release];


    [self.parentViewController dismissModalViewControllerAnimated:YES];




}


-(IBAction)cancel:(id)sender {

    [self.parentViewController dismissModalViewControllerAnimated:YES];

}



- (void)textFieldDidBeginEditing:(UITextField *)textField {




    CGRect textFieldRect =
    [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect =
    [self.view.window convertRect:self.view.bounds fromView:self.view];
    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    //if (textField == usernameField) 
    //  midline+=20;

    CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator =   (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;
    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }
    animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];


}

- (void)textFieldDidEndEditing:(UITextField *)textField
{



    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y += animatedDistance;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];

}


- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    // the user pressed the "Done" button, so dismiss the keyboard
    [textField resignFirstResponder];
    return NO;
}





// The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization.
    }
    return self;
}
*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (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.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}


@end

#导入“ResetPWD.h”
#导入“WebServiceController.h”
#导入“ProductAppDelegate.h”
@实施重置PWD
@合成oldPWD；
@合成新的pwd；
@合成新的pwd2；
@合成密码1；
@合成密码2；
-（iAction）完成：（id）发送方{
NSString*pwd=oldPWD.text；
NSString*pwd1=newPWD.text；
NSString*pwd2=newPWD2.text；
如果（！self.oldPWD.text）
{
UIAlertView*alert=[[UIAlertView alloc]initWithTitle:@“消息：@”请输入旧密码
代表：自我取消按钮：@“确定”其他按钮：无]；
[警报显示]；
[警报发布]；
回来
}
如果（！self.newPWD.text）
{
UIAlertView*alert=[[UIAlertView alloc]initWithTitle:@“消息：@”请输入新密码
代表：自我取消按钮：@“确定”其他按钮：无]；
[警报显示]；
[警报发布]；
回来
}
如果（[pwd1长度]=3）
{
errorString=[[NSString alloc]initWithFormat:@“%@\n已处理到代理注册。”，errorString]；
}
UIAlertView*successAlert=[[UIAlertView alloc]initWithTitle:errorDesc消息：errorString委托：nil CancelButtontTitle:@“确定”其他ButtontTitles:nil]；
[成功者秀]；
[成功释放]；
[self.parentViewController dismissModalViewControllerAnimated:是]；
}
-（iAction）取消：（id）发件人{
[self.parentViewController dismissModalViewControllerAnimated:是]；
}
-（无效）textFieldDidBeginEditing:（UITextField*）textField{
CGRect textFieldRect=
[self.view.window convertRect:textField.bounds fromView:textField]；
CGRect viewRect=
[self.view.window convertRect:self.view.fromView:self.view]；
CGFloat midline=textFieldRect.origin.y+0.5*textFieldRect.size.height；
//if（textField==usernameField）
//中线+=20；
CGFloat分子=中线-viewRect.origin.y-最小滚动分数*viewRect.size.height；
CGFloat分母=（最大滚动分数-最小滚动分数）*viewRect.size.height；
CGFloat heightFraction=分子/分母；
如果（高度分数<0.0）
{
高度分数=0.0；
}
否则如果（高度分数>1.0）
{
高度分数=1.0；
}
动画距离=地板（纵向\键盘\高度*高度分数）；
CGRect viewFrame=self.view.frame；
viewFrame.origin.y-=动画距离；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
}
-（void）textfielddidediting:（UITextField*）textField
{
CGRect viewFrame=self.view.frame；
viewFrame.origin.y+=动画距离；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationBeginsFromCurrentState:是]；
[UIView设置动画持续时间：键盘动画持续时间]；
[self.view setFrame:viewFrame]；
[UIView委员会]；
}
-（BOOL）textField应返回：（UITextField*）textField
{
//用户按下“完成”按钮，因此关闭键盘
[textField resignFirstResponder]；
返回否；
}
//指定的初始值设定项。如果以编程方式创建控制器并希望执行不适用于viewDidLoad的自定义，请重写。
/*
-（id）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
//自定义初始化。
}
回归自我；
}
*/
/*
//实现viewDidLoad以在加载视图（通常从nib）后执行附加设置。
-（无效）viewDidLoad{
[超级视图下载]；
}
*/
/*
//替代以允许默认纵向方向以外的方向。
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation{
//对于支持的方向，返回YES。
返回（interfaceOrientation==UIInterfaceOrientationGraphic）；
}
*/
-（无效）未收到记忆警告{
//如果视图没有superview，则释放该视图。
[超级记忆警告]；
//释放所有未使用的缓存数据、图像等。
}
-（无效）视图卸载{
[超级视频下载]；
//释放主视图的所有保留子视图。
//例如，self.myOutlet=nil；
}
-（无效）解除锁定{
[super dealoc]；
}
@结束

---

此视图不会显示在设备上，而是显示在模拟器上。设计也在xib文件中完成。

在实例化视图时，我需要使用initWithNibName。之后开始工作

请发布相关代码，我相信帮助会比现在和/或屏幕截图来得更快。您是自己强制执行模态还是使用presentModalViewController？我使用presentModalViewController