1、向系统申请的view button array 等资源一定要及时释放。尤其是img图片，更要及时释放。

2、在pad点餐系统中使用如下方法释放view资源，真是太有必要了。

//设置按钮状态及清空视图            -(void)clearSmallOrderList:(NSString *)code{    NSLog(@"进入OrderListViewController.m的-(void)clearSmallOrderList:(NSString *)code");    for (id obj in [self.view subviews]) {        if ([obj isKindOfClass:[UIButton class]]) {            UIButton* theButton = (UIButton*)obj;            if ([code isEqualToString:@"000"]&&theButton.tag==1) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"001"]&&theButton.tag==2) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"002"]&&theButton.tag==3) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"003"]&&theButton.tag==4) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"004"]&&theButton.tag==5) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"005"]&&theButton.tag==0) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"006"]&&theButton.tag==6) {                [theButton setSelected:YES];            }else{                [theButton setSelected:NO];            }        }else if([obj isKindOfClass:[UIView class]]){            UIView *view = (UIView *)obj;            if(view.tag==9999||view.tag==9998||view.tag==9997||view.tag==9996){                [view removeFromSuperview];                [view release];            }        }    }}//设置按钮状态及清空视图                            -(void)clearOrderList:(NSString *)code Title:(NSString *)title{    NSLog(@"进入OrderListViewController.m的-(void)clearOrderList:(NSString *)code Title:(NSString *)title");    for (id obj in [self.view subviews]) {        if ([obj isKindOfClass:[UIButton class]]) {            UIButton* theButton = (UIButton*)obj;            if ([code isEqualToString:@"000"]&&theButton.tag==1) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"001"]&&theButton.tag==2) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"002"]&&theButton.tag==3) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"003"]&&theButton.tag==4) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"004"]&&theButton.tag==5) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"005"]&&theButton.tag==0) {                [theButton setSelected:YES];            }else if ([code isEqualToString:@"006"]&&theButton.tag==6) {                [theButton setSelected:YES];            }else if ([theButton.titleLabel.text isEqualToString:title]) {                [theButton setSelected:YES];            }else                [theButton setSelected:NO];        }else if([obj isKindOfClass:[UIView class]]){            UIView *view = (UIView *)obj;            if(view.tag==9999||view.tag==9997||view.tag==9996){                [view removeFromSuperview];                [view release];            }        }    }}