iphone 更改键盘背景颜色

转载自：http://www.cocoachina.com/bbs/read.php?tid-12244.html

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- (void)textViewDidBeginEditing:(UITextView *)textView{    NSArray *ws = [[UIApplication sharedApplication] windows];    for(UIView *w in ws){        NSArray *vs = [w subviews];        for(UIView *v in vs){            if([[NSString stringWithUTF8String:object_getClassName(v)] isEqualToString:@"UIKeyboard"]){                v.backgroundColor = [UIColor redColor];            }        }    }}