Iphone 我怎样才能适应新环境？

我在ViewDidLoad中编写了如下代码

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

    UIColor *colorOne = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];
    UIColor *colorTwo = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];

   //Create the gradient and add it to our view's root layer
   CAGradientLayer *gradientLayer = [[[CAGradientLayer alloc] init] autorelease];
   gradientLayer.frame = CGRectMake(0.0, 0.0, 320.0, 480.0);
   [gradientLayer setColors:[NSArray arrayWithObjects:(id)colorOne.CGColor,    (id)colorTwo.CGColor, nil]];
   [self.view.layer insertSublayer:gradientLayer atIndex:0];

date1 = [[RRSGlowLabel alloc]     initWithFrame:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/2, 300, 480)];
   [date1 setTextAlignment:UITextAlignmentCenter];
   date1.center = CGPointMake((self.view.frame.size.width/2)-20, (self.view.frame.size.height/2)-100);
   date1.textColor = [UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];
   date1.font=[UIFont fontWithName:@"ds-digital" size:20.0];
    //[label sizeToFit];
   [date1 setBackgroundColor:[UIColor clearColor]];

   date1.glowOffset = CGSizeMake(0.0, 0.0);
   date1.glowColor = date1.textColor;
       date1.glowAmount = 120.0f;
  dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
   [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
   currentDate = [NSDate date];
   //[dateFormatter setDateFormat:@"hh:mm"];
   NSString *date = [dateFormatter stringFromDate:currentDate];
   [self.date1 setText:date];   
   [self.view addSubview:date1];

   time = [[RRSGlowLabel alloc]     initWithFrame:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/2, 300,  480)];
[time setTextAlignment:UITextAlignmentCenter];
time.center = CGPointMake((self.view.frame.size.width/2)-20, self.view.frame.size.height/2);
time.textColor = [UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];
time.font=[UIFont fontWithName:@"ds-digital" size:80.0];
//[label sizeToFit];
[time setBackgroundColor:[UIColor clearColor]];

time.glowOffset = CGSizeMake(0.0, 0.0);
time.glowColor = time.textColor;
    time.glowAmount = 120.0f;
currentDate = [NSDate date];
[dateFormatter setDateFormat:@"hh:mm"];
date = [dateFormatter stringFromDate:currentDate];
[self.time setText:date];   
[self.view addSubview:time];



seconds = [[UILabel alloc] initWithFrame:CGRectMake(self.view.frame.size.width/2,     self.view.frame.size.height/2, 300, 480)];
[seconds setTextAlignment:UITextAlignmentCenter];
seconds.center = CGPointMake((self.view.frame.size.width/2)+105, (self.view.frame.size.height/2)+20);
seconds.textColor = [UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];
seconds.font=[UIFont fontWithName:@"ds-digital" size:20.0];
currentDate = [NSDate date];
[dateFormatter setDateFormat:@"ss a"];
date = [dateFormatter stringFromDate:currentDate];
[seconds setText:date];
//[label sizeToFit];
[seconds setBackgroundColor:[UIColor clearColor]];
[self.view addSubview:seconds];

date = nil;
dateFormatter = nil;
currentDate = nil;

timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self    selector:@selector(updateTime) userInfo:nil repeats:YES];
 }

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简单地说，它将显示当前时间并显示光晕，我想知道，当我想旋转iphone时，如何编写代码，它应该随之旋转…

要启用旋转，您需要在视图控制器中实现以下方法：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

…支持所有方向。请注意，在iPhone上，您可能只希望支持3（iPhone上通常不支持倒立肖像），因此您可以根据需要返回

YES

或

NO

一旦实现了该方法，视图控制器现在应该根据方向更改进行旋转。但是，您的视图可能仍需要调整大小

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为此，您可以在每个视图上使用自动调整大小的遮罩（以允许它们适当地拉伸/收缩或移动），或者通过实现

WillAnimateRotationInterfaceOrientation:duration:

方法手动调整它们的帧。前者通常是更好的方法，尽管在某些情况下，如果界面在横向上发生重大变化，您可能需要手动调整帧，或添加/删除整个视图。

我尝试过，它可以工作，但退出速度非常慢，我看到许多程序工作速度非常快，我该怎么办？