ios 点餐系统 - 走看看

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ios 点餐系统
这个程序的主要界面就是一个TabBarController。总共三个标签，第一个是所有的可点的菜，第二个是已点的菜，第三个是可以留言或者查看所有留言。

下面是第一个页面：

右上角的i按钮是添加新菜，每个cell中的order就是点餐咯，可以重复按多次。

首先说下这个列表的数据是存放在coredata中的，这个项目的coredata有两个实体，一个是dishes保存每一道菜的名字，id，价格，描述，菜系等。还有一个实体是type保存菜系。

这个项目用coredata的方式，正好是我想学的。

就是在新建项目的时候勾选use coredata，那么在appdelegate中就会出现与coredata响应的代码了，只需要根据自己的需要稍微修改即可。或者是自己在已有的项目中添加一个coredata文件，然后将一个已经勾选了use coredata的项目中的appdelagate中的一些代码复制过来即可。

那么在各个文件中我需要用到coredata的时候要怎么操作呢？看下面的代码：
[cpp] view plain copy print ?

    HotelAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

    //connection

    NSManagedObjectContext *context = [appDelegate managedObjectContext];

    //table

    NSEntityDescription *entityDescr =[NSEntityDescription entityForName:@"Dishes" inManagedObjectContext:context];

    //query

    NSFetchRequest *request = [[NSFetchRequest alloc] init];

    [request setEntity:entityDescr];

    //pred

    //NSPredicate *pred = [NSPredicate predicateWithString:@"id=1"];



    NSSortDescriptor *nameDescriptor = [[NSSortDescriptor alloc] initWithKey:@"typeid" ascending:YES];

    NSArray *arraySortDescriptor = [[NSArray alloc] initWithObjects:nameDescriptor, nil];

    [request setSortDescriptors:arraySortDescriptor];

    [arraySortDescriptor release];



    NSError *error;

//  NSManagedObject *aDish = nil;

//  NSNumber *id = [NSNumber numberWithInt:1];

    NSArray *objects = [context executeFetchRequest:request error:&error];



    if(objects != nil){

        self.list = objects;

    }
```
	HotelAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
	//connection
	NSManagedObjectContext *context = [appDelegate managedObjectContext];
	//table 
	NSEntityDescription *entityDescr =[NSEntityDescription entityForName:@"Dishes" inManagedObjectContext:context];
	//query
	NSFetchRequest *request = [[NSFetchRequest alloc] init];
	[request setEntity:entityDescr];
	//pred
	//NSPredicate *pred = [NSPredicate predicateWithString:@"id=1"];
	
	NSSortDescriptor *nameDescriptor = [[NSSortDescriptor alloc] initWithKey:@"typeid" ascending:YES];
	NSArray *arraySortDescriptor = [[NSArray alloc] initWithObjects:nameDescriptor, nil];
	[request setSortDescriptors:arraySortDescriptor];
	[arraySortDescriptor release];
	
	NSError *error;
//	NSManagedObject *aDish = nil;
//	NSNumber *id = [NSNumber numberWithInt:1];
	NSArray *objects = [context executeFetchRequest:request error:&error];
	
	if(objects != nil){
		self.list = objects;
	}	
```
需要拿已存在于coredata中的文件的时候，就用上面的步骤就可以咯拿到的数据就在最后的self.list中了

可以看到上面的tableView是自己绘制的，先看下面代码：
[cpp] view plain copy print ?

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {



    NSUInteger row = [indexPath row];

    NSManagedObject *theObj = [self.list objectAtIndex:row];



    NSNumber *id = [theObj valueForKey:@"id"];

    NSInteger typeid = [[theObj valueForKey:@"typeid"] intValue];

    NSLog(@"tpyeid:%d",typeid);



    static NSString *CellIdentifier = @"Cell";



    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];



    UIColor *elemBgColor = [UIColor clearColor];



    UIImageView *img = [[UIImageView alloc] init];

    img.frame = CGRectMake(kX, kY, kRowHeight -10, kRowHeight -10);

    img.tag = kImage;

    [cell.contentView addSubview:img];

    [img release];



    UILabel *nameLbl = [[UILabel alloc] initWithFrame:CGRectMake(65, 0, 100, 25)];

    nameLbl.font = [UIFont systemFontOfSize:14];

    nameLbl.tag = kName;

        nameLbl.backgroundColor = elemBgColor;

    [cell.contentView addSubview:nameLbl];

    [nameLbl release];



    UILabel *typeLbl = [[UILabel alloc] initWithFrame:CGRectMake(160, 0, 70, 25)];

    typeLbl.font = [UIFont systemFontOfSize:14];

    typeLbl.tag = kType;

        typeLbl.backgroundColor = elemBgColor;

    [cell.contentView addSubview:typeLbl];

    [typeLbl release];



    UILabel *priceLbl = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 50, 25)];

    priceLbl.font =[UIFont systemFontOfSize:14];

    priceLbl.tag = kPrice;

        priceLbl.backgroundColor = elemBgColor;

    [cell.contentView addSubview:priceLbl];

    [priceLbl release];



    UILabel *introLbl = [[UILabel alloc] initWithFrame:CGRectMake(60, 25, 160, 30)];

    introLbl.tag = kIntro;

    introLbl.backgroundColor = elemBgColor;

    introLbl.numberOfLines = 2;

    introLbl.textColor = [UIColor grayColor];

    introLbl.font = [UIFont systemFontOfSize:12];

    [cell.contentView addSubview:introLbl];

    [introLbl release];



    UILabel *btnBgLbl = [[UILabel alloc] initWithFrame:CGRectMake(230, 25, 60, 30)];

        btnBgLbl.backgroundColor = elemBgColor;

    [cell.contentView addSubview:btnBgLbl];

    [btnBgLbl release];



    UIButton *orderBtn = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];

    orderBtn.frame = CGRectMake(230, 32, 60, 20);

    [orderBtn setTitle:@"order" forState:UIControlStateNormal];

    [orderBtn addTarget:self action:@selector(order:) forControlEvents:UIControlEventTouchUpInside];



    [cell.contentView addSubview:orderBtn];



    }

    cell.tag = 1 + [indexPath row];



    TableCellView *cellView = [[TableCellView alloc] init];

    cellView._count = [self.list count];

    cellView._index = [indexPath row];

    cell.backgroundView = cellView;

    [cellView release];





    NSString *imageName = [NSString stringWithFormat:@"%d.jpg",[id intValue]];

    UIImageView *img = (UIImageView *)[cell.contentView viewWithTag:kImage];

    img.image = [UIImage imageNamed:imageName];



    UILabel *nameLbl = (UILabel *)[cell.contentView viewWithTag:kName];

    nameLbl.text =  [theObj valueForKey:@"name"];//[list objectAtIndex:[indexPath row]];



    UILabel *typeLbl = (UILabel *)[cell.contentView viewWithTag:kType];

    typeLbl.text = [theObj valueForKey:@"type"];



    UILabel *priceLbl = (UILabel *)[cell.contentView viewWithTag:kPrice];

    NSNumber *nPrice = [theObj valueForKey:@"price"];

    priceLbl.text = [NSString stringWithFormat:@"￥%d",[nPrice intValue]];



    UILabel *introLbl = (UILabel *)[cell.contentView viewWithTag:kIntro];

    NSString *introText = [theObj valueForKey:@"intro"];

    if([introText length] > 70){

        introText = [introText substringToIndex:70];

        introText = [introText stringByAppendingString:@"..."];

    }

    introLbl.text = introText;

    return cell;

}
```
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
	
	NSUInteger row = [indexPath row];
	NSManagedObject *theObj = [self.list objectAtIndex:row];
	
	NSNumber *id = [theObj valueForKey:@"id"];
	NSInteger typeid = [[theObj valueForKey:@"typeid"] intValue];
	NSLog(@"tpyeid:%d",typeid);
	
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
	
	UIColor *elemBgColor = [UIColor clearColor];
		
	UIImageView *img = [[UIImageView alloc] init];
	img.frame = CGRectMake(kX, kY, kRowHeight -10, kRowHeight -10);
	img.tag = kImage;
	[cell.contentView addSubview:img];
	[img release];
	
	UILabel *nameLbl = [[UILabel alloc] initWithFrame:CGRectMake(65, 0, 100, 25)];
	nameLbl.font = [UIFont systemFontOfSize:14];
	nameLbl.tag = kName;
		nameLbl.backgroundColor = elemBgColor;
	[cell.contentView addSubview:nameLbl];
	[nameLbl release];
    
	UILabel *typeLbl = [[UILabel alloc] initWithFrame:CGRectMake(160, 0, 70, 25)];
	typeLbl.font = [UIFont systemFontOfSize:14];
	typeLbl.tag = kType;
		typeLbl.backgroundColor = elemBgColor;
	[cell.contentView addSubview:typeLbl];
	[typeLbl release];
	
	UILabel *priceLbl = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 50, 25)];
	priceLbl.font =[UIFont systemFontOfSize:14];
	priceLbl.tag = kPrice;
		priceLbl.backgroundColor = elemBgColor;
	[cell.contentView addSubview:priceLbl];
	[priceLbl release];
	
	UILabel *introLbl = [[UILabel alloc] initWithFrame:CGRectMake(60, 25, 160, 30)];	
	introLbl.tag = kIntro;
	introLbl.backgroundColor = elemBgColor;
	introLbl.numberOfLines = 2;
	introLbl.textColor = [UIColor grayColor];
	introLbl.font = [UIFont systemFontOfSize:12];
	[cell.contentView addSubview:introLbl];
	[introLbl release];
	
	UILabel *btnBgLbl = [[UILabel alloc] initWithFrame:CGRectMake(230, 25, 60, 30)];
		btnBgLbl.backgroundColor = elemBgColor;
	[cell.contentView addSubview:btnBgLbl];
	[btnBgLbl release];
		
	UIButton *orderBtn = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
	orderBtn.frame = CGRectMake(230, 32, 60, 20);
	[orderBtn setTitle:@"order" forState:UIControlStateNormal];
	[orderBtn addTarget:self action:@selector(order:) forControlEvents:UIControlEventTouchUpInside];
	
	[cell.contentView addSubview:orderBtn];
		
    }
	cell.tag = 1 + [indexPath row];
	
	TableCellView *cellView = [[TableCellView alloc] init];
	cellView._count = [self.list count];
	cellView._index = [indexPath row];
	cell.backgroundView = cellView;
	[cellView release];
	
	
	NSString *imageName = [NSString stringWithFormat:@"%d.jpg",[id intValue]];
	UIImageView *img = (UIImageView *)[cell.contentView viewWithTag:kImage];
	img.image = [UIImage imageNamed:imageName];
	
	UILabel *nameLbl = (UILabel *)[cell.contentView viewWithTag:kName];
	nameLbl.text =  [theObj valueForKey:@"name"];//[list objectAtIndex:[indexPath row]];
	
	UILabel *typeLbl = (UILabel *)[cell.contentView viewWithTag:kType];
	typeLbl.text = [theObj valueForKey:@"type"];
	
	UILabel *priceLbl = (UILabel *)[cell.contentView viewWithTag:kPrice];
	NSNumber *nPrice = [theObj valueForKey:@"price"];
	priceLbl.text = [NSString stringWithFormat:@"￥%d",[nPrice intValue]];
	
	UILabel *introLbl = (UILabel *)[cell.contentView viewWithTag:kIntro];
	NSString *introText = [theObj valueForKey:@"intro"];
	if([introText length] > 70){
		introText = [introText substringToIndex:70];
		introText = [introText stringByAppendingString:@"..."];
	}
	introLbl.text = introText;	
    return cell;
}
```
上面的代码中，由于坐着并没有为它的tableViewCell加一个id,所以当第一次创建cell的时候，是空的，需要自己定制，定制的过程就是把各个控件位置要放好，这个我没试过，所以对上面的坐标没什么感觉，这个需要多多尝试才知道。

这里要说的有几个点：（1）、tableViewCell有一个属性是contentView是用来容纳所有在他上面出现的控件的，自己绘制cell的时候，一定要把控件加上这个view上面，然后还有一个backgroundView是所有子view的最后面那个，在contentView上面。

（2）、本例中，cell的背景是自绘的，我不会，所以TableCellView类的代码看不太懂，有兴趣的朋友自己去研究下。

（3）、UIView有个属性tag,还有一个方法是viewWithTag.

tag是一个自己定义的常数，用来标记一个对象。viewWithTag方法呢，就是返回匹配给定的tag的view。
[cpp] view plain copy print ?

-(IBAction) add:(id)sender {

    AddController *addC = [[AddController alloc] initWithNibName:@"AddController" bundle:nil];

    [self.navigationController pushViewController:addC animated:YES];

    //self.navigationController.navigationBarHidden = NO;

    [addC release];

}
```
-(IBAction) add:(id)sender {
	AddController *addC = [[AddController alloc] initWithNibName:@"AddController" bundle:nil];
	[self.navigationController pushViewController:addC animated:YES];
	//self.navigationController.navigationBarHidden = NO;
	[addC release];
}
```
上面的代码是界面中右上角i按钮的响应方法，可以看到上面这种实现navigation跳转的方法是用push 对应的在返回的时候就用pop。这是在segue出现前的一个实现跳转的方法，现在的话有了segue，就不用这样做咯。

这个就是按完i按钮后来到的添加新菜系的界面xib文件。

由于我主要是讲我的收获，所以在这个界面我只想讲怎么往coredata中添加新元组咯
[cpp] view plain copy print ?

-(IBAction) add:(id)sender {

    if([name.text length]*[price.text length]*[type.text length]*[image.text length]*[intro.text length] == 0){

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Attention" message:@"All fields needed!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

        [alert show];

        [alert release];

    }else{



        HotelAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

        //connection

        NSManagedObjectContext *context = [appDelegate managedObjectContext];

        //table

        NSEntityDescription *entityDescr =[NSEntityDescription entityForName:@"Dishes" inManagedObjectContext:context];

        //query

        NSFetchRequest *request = [[NSFetchRequest alloc] init];

        [request setEntity:entityDescr];

        //pred

        //NSPredicate *pred = [NSPredicate predicateWithString:@"id=1"];



        NSError *error;

        NSManagedObject *aDish = nil;

        NSNumber *id = [NSNumber numberWithInt:1];

        NSArray *objects = [context executeFetchRequest:request error:&error];

        if(objects != nil){

            aDish = [objects lastObject];

            id = [aDish valueForKey:@"id"];

            id = [NSNumber numberWithInt:[id intValue]+1];



        }



        aDish = [NSEntityDescription insertNewObjectForEntityForName:@"Dishes" inManagedObjectContext:context];

        [aDish setValue:id forKey:@"id"];

        [aDish setValue:name.text forKey:@"name"];

        [aDish setValue:[NSNumber numberWithInt:[price.text intValue]] forKey:@"price"];

        [aDish setValue:type.text forKey:@"type"];

        [aDish setValue:image.text forKey:@"image"];

        [aDish setValue:intro.text forKey:@"intro"];

        [request release];

        [context save:&error];

        [self clearFields];

    }

}
```
-(IBAction) add:(id)sender {
	if([name.text length]*[price.text length]*[type.text length]*[image.text length]*[intro.text length] == 0){
		UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Attention" message:@"All fields needed!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
		[alert show];
		[alert release];
	}else{
		
		HotelAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
		//connection
		NSManagedObjectContext *context = [appDelegate managedObjectContext];
		//table 
		NSEntityDescription *entityDescr =[NSEntityDescription entityForName:@"Dishes" inManagedObjectContext:context];
		//query
		NSFetchRequest *request = [[NSFetchRequest alloc] init];
		[request setEntity:entityDescr];
		//pred
		//NSPredicate *pred = [NSPredicate predicateWithString:@"id=1"];
		
		NSError *error;
		NSManagedObject *aDish = nil;
		NSNumber *id = [NSNumber numberWithInt:1];
		NSArray *objects = [context executeFetchRequest:request error:&error];
		if(objects != nil){
			aDish = [objects lastObject];
			id = [aDish valueForKey:@"id"];
			id = [NSNumber numberWithInt:[id intValue]+1];

		}
		
		aDish = [NSEntityDescription insertNewObjectForEntityForName:@"Dishes" inManagedObjectContext:context];
		[aDish setValue:id forKey:@"id"];
		[aDish setValue:name.text forKey:@"name"];
		[aDish setValue:[NSNumber numberWithInt:[price.text intValue]] forKey:@"price"];
		[aDish setValue:type.text forKey:@"type"];
		[aDish setValue:image.text forKey:@"image"];
		[aDish setValue:intro.text forKey:@"intro"];
		[request release];
		[context save:&error];
		[self clearFields];
	}
}
```
上面的代码是add按钮的响应方法，看完就知道了咯。

、

这个界面要讲的就是view的动画。这个程序中，左右滑动，可以实现翻页，看上一道菜或下一道菜，这个对我来说很有用。
[cpp] view plain copy print ?

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    //int count = [touches count];

    //NSLog(@"count=%d",count);

    UITouch *touch = [touches anyObject];

    CGPoint location = [touch locationInView:self.view];

    self.lastLoction = location;

    moveChanged = NO;

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{



}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    CGPoint location = [[touches anyObject] locationInView:self.view];

    lastLoction = location;

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];

    CGPoint location = [touch locationInView:self.view];

    if(!moveChanged && fabs(location.x - lastLoction.x) > 60 && fabs(location.y - lastLoction.y) < 25){

        moveChanged = YES;

        [UIView beginAnimations:nil context:imageView];

        [UIView setAnimationDuration:1.0];

        [UIView setAnimationTransition:( location.x - lastLoction.x > 0? UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown) forView:self.view cache:YES];

        [UIView setAnimationDelegate:self];

        [UIView setAnimationDidStopSelector:@selector(onAnimationStop:finished:context:)];

        [UIView commitAnimations];



        NSUInteger count = [self.managedObjects count];



        if(location.x - lastLoction.x >0){//right

            if(currentRowIndex < count-1){

                currentRowIndex = currentRowIndex +1;

            }

        }else{//left

            if(currentRowIndex > 0){

                currentRowIndex = currentRowIndex -1;

            }

        }



        self.theObj = [self.managedObjects objectAtIndex:currentRowIndex];

        NSNumber *id = [self.theObj valueForKey:@"id"];

        NSLog(@"%d",[id intValue]);

        NSLog(@"distance:%f",location.x - lastLoction.x);



        self.imageView.image =  [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",[id intValue]]];



        NSMutableString *title = [[NSMutableString alloc] init];

        [title appendString: [theObj valueForKey:@"name"]];

        [title appendString:@"  "];

        [title appendString:[theObj valueForKey:@"type"]];

        NSNumber *price = [theObj valueForKey:@"price"];

        [title appendString:[NSString stringWithFormat:@"￥%d",[price intValue]]];

        self.nameLbl.text = title;

        self.introText.text = [theObj valueForKey:@"intro"];

        [title release];



        NSDictionary *theRow = [FileController readRow:currentRowIndex];

        NSUInteger orderCount = 0;

        if(theRow != nil){

            orderCount = [[theRow valueForKey:@"count"] intValue];

        }



        self.countLbl.text = [NSString stringWithFormat:@"%d",orderCount];



        lastLoction = location;

    }



}
```
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	//int count = [touches count];
	//NSLog(@"count=%d",count);
	UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:self.view];
	self.lastLoction = location;
	moveChanged = NO;
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{

}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
	CGPoint location = [[touches anyObject] locationInView:self.view];
	lastLoction = location;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
	UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:self.view];
	if(!moveChanged && fabs(location.x - lastLoction.x) > 60 && fabs(location.y - lastLoction.y) < 25){
		moveChanged = YES;
		[UIView beginAnimations:nil context:imageView];
		[UIView setAnimationDuration:1.0];
		[UIView setAnimationTransition:( location.x - lastLoction.x > 0? UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown) forView:self.view cache:YES];
		[UIView setAnimationDelegate:self];
		[UIView setAnimationDidStopSelector:@selector(onAnimationStop:finished:context:)];
		[UIView commitAnimations];
		
		NSUInteger count = [self.managedObjects count];
		
		if(location.x - lastLoction.x >0){//right
			if(currentRowIndex < count-1){
				currentRowIndex = currentRowIndex +1;
			}
		}else{//left
			if(currentRowIndex > 0){
				currentRowIndex = currentRowIndex -1;
			}
		}
		
		self.theObj = [self.managedObjects objectAtIndex:currentRowIndex];
		NSNumber *id = [self.theObj valueForKey:@"id"];
		NSLog(@"%d",[id intValue]);
		NSLog(@"distance:%f",location.x - lastLoction.x);
		
		self.imageView.image =	[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",[id intValue]]];
		
		NSMutableString *title = [[NSMutableString alloc] init];
		[title appendString: [theObj valueForKey:@"name"]];
		[title appendString:@"  "];
		[title appendString:[theObj valueForKey:@"type"]];
		NSNumber *price = [theObj valueForKey:@"price"];
		[title appendString:[NSString stringWithFormat:@"￥%d",[price intValue]]];
		self.nameLbl.text = title;
		self.introText.text = [theObj valueForKey:@"intro"];		
		[title release];
		
		NSDictionary *theRow = [FileController readRow:currentRowIndex];
		NSUInteger orderCount = 0;
		if(theRow != nil){
			orderCount = [[theRow valueForKey:@"count"] intValue];
		}
		
		self.countLbl.text = [NSString stringWithFormat:@"%d",orderCount];

		lastLoction = location;
	}
    
}
```
[cpp] view plain copy print ?

[UIView beginAnimations:nil context:imageView];

[UIView setAnimationDuration:1.0];

[UIView setAnimationTransition:( location.x - lastLoction.x > 0? UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown) forView:self.view cache:YES];

[UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector(onAnimationStop:finished:context:)];

[UIView commitAnimations];
```
		[UIView beginAnimations:nil context:imageView];
		[UIView setAnimationDuration:1.0];
		[UIView setAnimationTransition:( location.x - lastLoction.x > 0? UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown) forView:self.view cache:YES];
		[UIView setAnimationDelegate:self];
		[UIView setAnimationDidStopSelector:@selector(onAnimationStop:finished:context:)];
		[UIView commitAnimations];
```
截取的这几句代码就是一个动画的过程.

第二个标签是读取已经下单的菜，这个没什么好说的和第一个标签的第一个页面很相似。

第三个界面是一个可以发表建议的界面，用到了segment controller来分两个界面，一个是写的一个是看全部的历史建议的。

切换segmentController上面的标签时，会响应valueChange方法，可以在里面判断是要显示哪个界面。

POST请求的发送也可以再复习一下：
[cpp] view plain copy print ?

NSString *postMsg =[NSString stringWithFormat:@"user=%@&content=%@",self.name.text,self.textView.text];

NSData *postData = [postMsg dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];



NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://bula.kilu.net/post.php"]];

[request setHTTPMethod:@"POST"];

[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

[request setHTTPBody:postData];



[NSURLConnection connectionWithRequest:request delegate:self];
```
	NSString *postMsg =[NSString stringWithFormat:@"user=%@&content=%@",self.name.text,self.textView.text];
	NSData *postData = [postMsg dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
	NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
	
	NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://bula.kilu.net/post.php"]];
	[request setHTTPMethod:@"POST"];
	[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
	[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
	[request setHTTPBody:postData];

	[NSURLConnection connectionWithRequest:request delegate:self];
```
好了我学到的东西是这些，还有一些是我看不懂的对于自己绘制一些view的方法我还是不会，需要补补。

源码我待会会上传，有兴趣的朋友下载去研究下咯不错的学习资料。，如果运行的时候说差哪一张图片的什么就随便放张进去文件夹里面然后按它说的给个名字就行了，不影响代码研究。

上传好了源码地址：ios点餐系统
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原文地址：https://www.cnblogs.com/yulang314/p/3550324.html