iPhone键盘改变颜色

只有这2种数字键盘才有效果：UIKeyboardTypeNumberPad，UIKeyboardTypePhonePad
keyboardAppearance ＝ UIKeyboardAppearanceAlert 
代码如下：
 NSArray *ws = [[UIApplication sharedApplication] windows];
     for(UIView *w in ws){  
        NSArray *vs = [w subviews];
        for(UIView *v in vs){

1.             if([[NSString stringWithUTF8String:object_getClassName(v)] isEqualToString:@"UIKeyboard"]){
2.                 v.backgroundColor = [UIColor redColor];
3.             }
4.         }
5.     }

从一个界面push到下一界面左上角返回按钮文字设置
在父viewController中如下设置：
    UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];
    backbutton.title = @"返回列表";
    self.navigationItem.backBarButtonItem = backbutton;
    [backbutton release];
navigationbar的back键触发其他事件
UIButton *back =[[UIButton alloc] initWithFrame:CGRectMake(200, 25, 63, 30)]; 
[back addTarget:self act
ion:@selector(reloadRowData:) forControlEvents:UIControlEventTouchUpInside];
[back setImage:[UIImage imageNamed:@"返回按钮.png"] forState:UIControlStateNormal];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:back];
self.navigationItem.leftBarButtonItem = loginButtonItem
[back release];
[backButtonItem release];
//防止屏幕暗掉锁屏
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
//将图片从左到右翻页效果显示
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 0, 470)];
    [imageView setImage:[UIImage imageNamed:@"Bg.jpg"]];
    self.myImageView =imageView;
    [self.view addSubview:imageView];
    [imageView release];
    CGContextRef context = UIGraphicsGetCurrentContext();
    [UIView beginAnimations:nil context:context];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationDuration:0.5];
    [myImageView setFrame:CGRectMake(0, 0, 310, 470)];    
    [UIView commitAnimations];
让覆盖在下面层的视图接受触摸事件
searchImage.exclusiveTouch = YES;//第一层
searchImage.userInteractionEnabled = NO;
myMapView.exclusiveTouch = NO;//第二层
myMapView.userInteractionEnabled = YES;
View的缩放
NSValue *touchPointValue = [[NSValue valueWithCGPoint:CGPointMake(100,100)] retain];
[UIView beginAnimations:nil context:touchPointValue];
transform = CGAffineTransformMakeScale(0.1,0.21);
firstPieceView.transform = transform;
[UIView commitAnimations];