Iphone 带xib-won和x27的模态uiviewcontroller；不显示隐藏的控件

我有一个带有xib的简单UIViewcontroller。我以模态的方式展示了它，它正确地显示了我在xib上有三个控件，我想隐藏它们，直到用户按下OK按钮，然后在应用程序连接到远程服务器时显示，然后在连接完成时隐藏它们自己。我已将它们正确地连接到IBO插座上。我的问题是，当调用OK按钮所连接的iAction方法时，将它们的hidden属性设置为NO不会使它们可见。代码如下：

#import <UIKit/UIKit.h>
#import "PasswordWebViewController.h"

    @interface ExistingUserController : UIViewController<UITextFieldDelegate> {
       UITextField *emailField;
       UITextField *passwordField; 
       NSString *password;
       NSString *email;
       UIActivityIndicatorView *spinner;
       UIImageView *loadingImg;
           UILabel *loadingLabel;
}
@property (nonatomic, retain) IBOutlet UITextField *emailField;
@property (nonatomic, retain) IBOutlet UITextField *passwordField;
@property (nonatomic, retain) NSString *email;
@property (nonatomic, retain) NSString *password;
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *spinner;
@property (nonatomic, retain) IBOutlet UILabel *loadingLabel;
@property (nonatomic, retain) IBOutlet UIImageView *loadingImg;
-(IBAction) onClickSend: (id) sender;
-(IBAction) onClickCancel: (id) sender;
-(IBAction) onClickResetPW: (id) sender;
-(void)showLoadingIndicators;
-(void)hideLoadingIndicators;
@end

这很好，但是当我在onClickSend方法中调用showLoadingIndicators，将hidden设置为NO时，控件就不会显示。它肯定叫这个方法

  -(IBAction) onClickSend: (id) sender{
    if ([email length] >0 && [password length] >0){
        UIApplication *myApp = [UIApplication sharedApplication];
        [self showLoadingIndicators];
        noIBAppDelegate*appDelegate = (noIBAppDelegate*)myApp.delegate;
        [appDelegate tryLoadingUserEmail:email AndPassword:password];

    }    
    else{
        UIAlertView *missingAlert = [[[UIAlertView alloc] initWithTitle:@"Error" message:@"You have a blank email or password." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
        [missingAlert show];
    }
}

-(void)showLoadingIndicators{


    self.loadingImg.hidden =NO;
    [self.view bringSubviewToFront:loadingImg];
    self.loadingLabel.hidden = NO;
    [self.view bringSubviewToFront:loadingLabel];
    [self.spinner startAnimating];


}

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我可能错过了一些明显的东西

请注意，设置可见性的另一种方法是将标签（和其他屏幕项目）的alpha设置为1（可见）或0（不可见）。这可能行得通

e、 g

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你合成标签了吗？如果没有，我认为您应该使用[loadingLabel setHidden:YES]

您如何知道

hideLoadingIndicators

正在工作？您确定默认情况下这些控件没有隐藏吗？我已经检查了xib中控件的隐藏属性，如果我没有调用hideLoadingIndicators方法，那么它们是可见的。您如何设置

电子邮件

和

密码

？您提到正在调用该方法。你指的是

showLoadingIndicators

还是

onClickSend:

？事实上，我自己在自己的应用程序中使用了alpha，因为“隐藏”对我不起作用。

  -(IBAction) onClickSend: (id) sender{
    if ([email length] >0 && [password length] >0){
        UIApplication *myApp = [UIApplication sharedApplication];
        [self showLoadingIndicators];
        noIBAppDelegate*appDelegate = (noIBAppDelegate*)myApp.delegate;
        [appDelegate tryLoadingUserEmail:email AndPassword:password];

    }    
    else{
        UIAlertView *missingAlert = [[[UIAlertView alloc] initWithTitle:@"Error" message:@"You have a blank email or password." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
        [missingAlert show];
    }
}

-(void)showLoadingIndicators{


    self.loadingImg.hidden =NO;
    [self.view bringSubviewToFront:loadingImg];
    self.loadingLabel.hidden = NO;
    [self.view bringSubviewToFront:loadingLabel];
    [self.spinner startAnimating];


}

self.loadingLabel.alpha = 0;