ipad – UITextView宽度大于512不显示文本

textView = [[UITextView alloc] initWithFrame: CGRectMake(0,513,1024)];

它不再显示任何文本… 512工作,任何大小也低于这个,但任何大于512,它停止显示任何文本.完整代码：

- (void)loadView {
    self.navigationItem.hidesBACkButton = YES;

    self.view = [[UIView alloc] init];
    self.view.BACkgroundColor = [UIColor blackColor];

    RDLocalizedStrings * Strings = [RDLocalizedStrings defaultLocalizedStrings];

    NSString* message = [Strings getStringWithKey: @"noupdatesAvailableText"];

    CGFloat messageFontSize;

    RDRectCreate(messagE);

    BOOL iPad = NO;
#ifdef UI_user_iNTERFACE_I@L_507_4@m
    iPad = (UI_user_iNTERFACE_I@L_507_4@m() == UIUserInterfaceI@L_507_4@mPad);
#endif
    if (iPad) {
        RDRectWrite(message,100,200);
        messageFontSize = 20.0;
    } else {
        RDRectWrite(message,320,480);
        messageFontSize = 20.0;
    }

    textView = [[UITextView alloc] initWithFrame: messageRect];
    textView.text = message;
    textView.BACkgroundColor = [UIColor redColor];
    textView.textAlignment = UITextAlignmentCenter;
    textView.textColor = [UIColor whiteColor];
    textView.font = [UIFont systemFontOfSize: messageFontSize];
    textView.editable = NO;

    [self.view addSubview: textView];
}