Post like the new tweet view in twitter for iPhone

new_tweet.m

#import "PostViewController.h"
#import "WoyiAppDelegate.h"
#import "ImagePickerController.h"


@implementation PostViewController


#pragma mark -
#pragma mark Initialization

- (id)initWithTitle:(NSString *)title 
{
	if (self = [super initWithStyle:UITableViewStylePlain])
	{
		self.navigationItem.title = title;
		self.tableView.scrollEnabled = NO;
		appDelegate = [(id)[UIApplication sharedApplication] delegate];
	}
	
	return self;
}

- (void)viewDidLoad 
{
    [super viewDidLoad];
	
	[self loadLeftBarButton];	
	
	[self loadCountLabelAndCloseButton];
}

- (void)viewDidAppear:(BOOL)animated
{
	[super viewDidAppear:animated];
	
	[titleView becomeFirstResponder];
}

- (void)loadLeftBarButton {
	self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"取消"
																			  style:UIBarButtonItemStyleBordered
																			 target:self	
																			 action:@selector(dismissModalController)] autorelease];			
}

- (void)loadRightBarButton 
{
	self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"发送"
																			   style:UIBarButtonItemStyleBordered
																			  target:self	
																			  action:@selector(commitPostAction)] autorelease];	
}

- (void)dismissModalController 
{
	[self dismissModalViewControllerAnimated:YES];
}

- (void)loadCountLabelAndCloseButton
{
	countLabel = [[UILabel alloc] initWithFrame:CGRectMake(270, 193, 50, 30)];
	countLabel.text = @"140";
	countLabel.textColor = [UIColor grayColor];
	countLabel.font = [UIFont boldSystemFontOfSize:15];
	countLabel.backgroundColor = [UIColor clearColor];
	[self.view addSubview:countLabel];
	
	keyboardCloseButton = [[UIButton alloc] initWithFrame:CGRectMake(285, 195, 50, 30)];
	[keyboardCloseButton setTag:1];
	[keyboardCloseButton setImage:[UIImage imageNamed:@"image128.png"] forState:UIControlStateNormal];
	[keyboardCloseButton addTarget:self action:@selector(closeKeyboard) forControlEvents:UIControlEventTouchUpInside];	
	[keyboardCloseButton setHidden:YES];
	[self.view addSubview:keyboardCloseButton];
	
	dateCloseButton = [[UIButton alloc] initWithFrame:CGRectMake(285, 195, 50, 30)];
	[dateCloseButton setTag:1];
	[dateCloseButton setImage:[UIImage imageNamed:@"image128.png"] forState:UIControlStateNormal];
	[dateCloseButton addTarget:self action:@selector(hideDatePickerView) forControlEvents:UIControlEventTouchUpInside];
	[dateCloseButton setHidden:YES];
	[self.view addSubview:dateCloseButton];	
	
	cateCloseButton= [[UIButton alloc] initWithFrame:CGRectMake(285, 195, 50, 30)];
	[cateCloseButton setTag:1];
	[cateCloseButton setImage:[UIImage imageNamed:@"image128.png"] forState:UIControlStateNormal];
	[cateCloseButton addTarget:self action:@selector(hideCategoryPickerView) forControlEvents:UIControlEventTouchUpInside];	
	[cateCloseButton setHidden:YES];
	[self.view addSubview:cateCloseButton];	
}

- (void)showAlertMessage:(NSString *)message
{
	UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:message delegate:self 
											  cancelButtonTitle:@"OK" otherButtonTitles:nil];
	[alertView show];
	[alertView release];
}

- (void)commitPostAction 
{
	NSString *apiString = [NSString stringWithFormat:@"%@/post_mobile_event",API_SERVER];		
	if ([despView.text length] > 0)
	{
		rssParser = [[BlogRssParser alloc] init];
		rssParser.delegate = self;
		rssParser.currentApiIndex = kPostMobileEvent;
		
		NSMutableDictionary *paramsDict = [[NSMutableDictionary alloc] init];
		[paramsDict setValue:titleView.text forKey:@"title"];
		[paramsDict setValue:despView.text forKey:@"description"];
		[paramsDict setValue:selectedCate forKey:@"category"];
		[paramsDict setValue:selectedDate forKey:@"end_time"];		
		[paramsDict setValue:[NSString stringWithFormat:@"%f",appDelegate.latitude] forKey:@"lat"];
		[paramsDict setValue:[NSString stringWithFormat:@"%f",appDelegate.longitude] forKey:@"lng"];		
		[paramsDict setValue:@"状态" forKey:@"sign"];
		
		[rssParser parseXMLDataWithAPI:apiString AndParams:paramsDict];
		[paramsDict release];			
	}	
	else
		[self showAlertMessage:@"标题不能为空."];	
}


- (void)hideDate
{
	selectedDate = [NSString stringWithFormat:@"%@",datePickerView.date];
	[datePickButton setTitle:selectedDate forState:UIControlStateNormal];
	[datePickerView removeFromSuperview];	
}

- (void)hideCategory
{
	[catePickerView removeFromSuperview];
}


- (void)hideDatePickerView
{
	CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
	CGRect endFrame = datePickerView.frame;
	endFrame.origin.y = screenRect.origin.y + screenRect.size.height;
	
	// start the slide down animation
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:0.3];
	
	// we need to perform some post operations after the animation is complete
	[UIView setAnimationDelegate:self];
	[UIView setAnimationDidStopSelector:@selector(hideDate)];
	
	datePickerView.frame = endFrame;
	[UIView commitAnimations];
	
	// grow the table back again in vertical size to make room for the date picker
	CGRect newFrame = self.tableView.frame;
	newFrame.size.height += datePickerView.frame.size.height;
	self.tableView.frame = newFrame;
	
	// remove the "Done" button in the nav bar
	dateCloseButton.hidden = YES;
	
}

- (void)hideCategoryPickerView
{
	CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
	CGRect endFrame = catePickerView.frame;
	endFrame.origin.y = screenRect.origin.y + screenRect.size.height;
	
	// start the slide down animation
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:0.3];
	
	// we need to perform some post operations after the animation is complete
	[UIView setAnimationDelegate:self];
	[UIView setAnimationDidStopSelector:@selector(hideCategory)];
	
	catePickerView.frame = endFrame;
	[UIView commitAnimations];
	
	// grow the table back again in vertical size to make room for the date picker
	CGRect newFrame = self.tableView.frame;
	newFrame.size.height += catePickerView.frame.size.height;
	self.tableView.frame = newFrame;
	
	// remove the "Done" button in the nav bar
	cateCloseButton.hidden = YES;	
}


- (void)pickImage {	
	[self presentModalViewController:[[ImagePickerController alloc] initWithViewController:self] animated:YES];
}


- (void)pickTime {
	NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
	[dateFormatter setDateStyle:NSDateFormatterShortStyle];
	datePickerView = [[UIDatePicker alloc] initWithFrame:CGRectZero];
	datePickerView.date = [NSDate date];	
	[self showDatePickerView];
}

- (void)pickCategory {
	cateArray = [[NSArray alloc] initWithObjects:@"户外旅游",@"生活聚会",@"公益活动",@"娱乐演出",@"夜生活",@"体育活动",@"展览会议",nil];	
	catePickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];
	catePickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	catePickerView.dataSource = self;
	catePickerView.delegate = self;	
	catePickerView.showsSelectionIndicator = YES;	
	[self showCategoryPickerView];
}

- (void)showDatePickerView {
	
	// check if our date picker is already on screen
	if (datePickerView.superview == nil)
	{
		[self.view.window addSubview: datePickerView];
		
		// compute the start frame
		CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
		CGSize pickerSize = [datePickerView sizeThatFits:CGSizeZero];
		CGRect startRect = CGRectMake(0.0,screenRect.origin.y + screenRect.size.height,pickerSize.width, pickerSize.height);
		datePickerView.frame = startRect;
		
		// compute the end frame
		CGRect pickerRect=CGRectMake(0.0,screenRect.origin.y+screenRect.size.height-pickerSize.height,pickerSize.width,pickerSize.height);
		// start the slide up animation
		[UIView beginAnimations:nil context:NULL];
		[UIView setAnimationDuration:0.3];
		
		// we need to perform some post operations after the animation is complete
		[UIView setAnimationDelegate:self];
		
		datePickerView.frame = pickerRect;
		
		// shrink the table vertical size to make room for the date picker
		CGRect newFrame = self.tableView.frame;
		newFrame.size.height -= datePickerView.frame.size.height;
		self.tableView.frame = newFrame;
		
		[UIView commitAnimations];		
		
		dateCloseButton.hidden = NO;		
	}
}

- (void)showCategoryPickerView {
	
	// check if our date picker is already on screen
	if (catePickerView.superview == nil)
	{
		[self.view.window addSubview: catePickerView];
		
		// compute the start frame
		CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
		CGSize pickerSize = [catePickerView sizeThatFits:CGSizeZero];
		CGRect startRect = CGRectMake(0.0,screenRect.origin.y + screenRect.size.height,pickerSize.width, pickerSize.height);
		catePickerView.frame = startRect;
		
		// compute the end frame
		CGRect pickerRect=CGRectMake(0.0,screenRect.origin.y+screenRect.size.height-pickerSize.height,pickerSize.width,pickerSize.height);
		// start the slide up animation
		[UIView beginAnimations:nil context:NULL];
		[UIView setAnimationDuration:0.3];
		
		// we need to perform some post operations after the animation is complete
		[UIView setAnimationDelegate:self];
		
		catePickerView.frame = pickerRect;
		
		// shrink the table vertical size to make room for the date picker
		CGRect newFrame = self.tableView.frame;
		newFrame.size.height -= catePickerView.frame.size.height;
		self.tableView.frame = newFrame;
		
		[UIView commitAnimations];		
		
		cateCloseButton.hidden = NO;		
	}
}

- (void)showGeoView {
	UILabel *geoLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 198, 250, 20)];
	geoLabel.text = [NSString stringWithFormat:@"%f,%f %@",appDelegate.longitude,appDelegate.latitude,appDelegate.currentAddress];
	geoLabel.textColor = [UIColor grayColor];
	geoLabel.font = [UIFont systemFontOfSize:12];
	[self.view addSubview:geoLabel];	
}


- (void)closeKeyboard
{	
	NSInteger tag = [keyboardCloseButton tag];	
    if (tag == 0) 
	{		
		[despView becomeFirstResponder];
		keyboardCloseButton.hidden = NO;
	}
	else if (tag == 1)
	{		
		[despView resignFirstResponder];
		keyboardCloseButton.hidden = YES;
	}
	else if (tag == 2) 
	{
		[titleView resignFirstResponder];
		keyboardCloseButton.hidden = YES;
	}
	else
	{
		[titleView becomeFirstResponder];
		keyboardCloseButton.hidden = NO;
	}
}


#pragma mark -
#pragma mark BlogRssParserDelegate Methods
- (void)processCompleted
{
	if ([rssParser.rssItems count] > 0 && [[rssParser.rssItems objectAtIndex:0] description] > 0) 
	{
		[rssParser showAlertMessage:@"提交成功."];
		[self dismissModalViewControllerAnimated:YES];
	}
	else 
		[rssParser showAlertMessage:@"提交失败."];		
}

-(void)processHasErrors
{
	[rssParser showAlertMessage:@"Please check if you are connected to internet."];
}


#pragma mark -
#pragma mark Picker Data Source Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
	return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
	return [cateArray count];
}


#pragma mark Picker Delegate Methods
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
	return [cateArray objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
	[pickerView selectRow:row inComponent:0 animated:YES];
	
	selectedCate = [cateArray objectAtIndex:row];
	[catePickButton setTitle:selectedCate forState:UIControlStateNormal];
}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
	return 150;
}


#pragma mark -
#pragma mark UITexFieldDelegate Methods
- (void)textFieldDidBeginEditing:(UITextField *)textField 
{
	[keyboardCloseButton setTag:2];
	keyboardCloseButton.hidden = NO;
}

- (void)textFieldDidEndEditing:(UITextField *)textField 
{
	[keyboardCloseButton setTag:3];
}


#pragma mark -
#pragma mark UITexViewDelegate Methods
- (void)textViewDidBeginEditing:(UITextView *)textView {
	[keyboardCloseButton setTag:1];
	keyboardCloseButton.hidden = NO;
}

- (void)textViewDiddEndEditing:(UITextView *)textView {
	[keyboardCloseButton setTag:0];
}

- (void)textViewDidChange:(UITextView *)textView
{	
	if ([textView.text length] > 0) 
		[self loadRightBarButton];
	
	if ([textView.text length] == 0) 
		self.navigationItem.rightBarButtonItem = nil;
	
	countLabel.text = [NSString stringWithFormat:@"%d",140-[textView.text length]];
}


#pragma mark -
#pragma mark Table view Helper Methods
- (void)loadTitleViewForCell:(UITableViewCell *)cell
{
	titleView = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 310, 30)];
	titleView.delegate = self;
	titleView.placeholder = @"主题:";
	titleView.font = [UIFont boldSystemFontOfSize:14];
	[cell.contentView addSubview:titleView];
}

- (void)loadDespViewForCell:(UITableViewCell *)cell 
{
	despView = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 320, 180)];
	despView.delegate = self;
	despView.font = [UIFont systemFontOfSize:14];	
	[cell.contentView addSubview:despView];	
}

- (void)loadOtherViewForCell:(UITableViewCell *)cell 
{
	photoPickButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 160, 110)];
	[photoPickButton setTitle:@"图片" forState:UIControlStateNormal];
	photoPickButton.backgroundColor = [UIColor grayColor];
	[photoPickButton addTarget:self action:@selector(pickImage) forControlEvents:UIControlEventTouchUpInside];
	[cell.contentView addSubview:photoPickButton];
	
    geoPickButton = [[UIButton alloc] initWithFrame:CGRectMake(160, 0, 160, 110)];
	[geoPickButton setTitle:@"经纬" forState:UIControlStateNormal];
	geoPickButton.backgroundColor = [UIColor darkGrayColor];
	[geoPickButton addTarget:self action:@selector(showGeoView) forControlEvents:UIControlEventTouchUpInside];
	[cell.contentView addSubview:geoPickButton];

	datePickButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 110, 160, 110)];
	[datePickButton setTitle:@"时间" forState:UIControlStateNormal];
	datePickButton.backgroundColor = [UIColor darkGrayColor];
	datePickButton.titleLabel.numberOfLines = 2;
	[datePickButton addTarget:self action:@selector(pickTime) forControlEvents:UIControlEventTouchUpInside];
	[cell.contentView addSubview:datePickButton];

	catePickButton = [[UIButton alloc] initWithFrame:CGRectMake(160, 110, 160, 110)];
	[catePickButton setTitle:@"分类" forState:UIControlStateNormal];
	catePickButton.backgroundColor = [UIColor grayColor];
	[catePickButton addTarget:self action:@selector(pickCategory) forControlEvents:UIControlEventTouchUpInside];	
	[cell.contentView addSubview:catePickButton];
}


#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 3;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{    
	static NSString *CellIdentifier = @"Cell";
	UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
	
	if (cell == nil) {
		cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
		cell.accessoryType = UITableViewCellAccessoryNone;
		cell.selectionStyle = UITableViewCellSelectionStyleNone;
	}	
	
	if (indexPath.row == 0) 
		[self loadTitleViewForCell:cell];		
	else if	(indexPath.row == 1)
		[self loadDespViewForCell:cell];
	else 
		[self loadOtherViewForCell:cell];
	
	return cell;
}


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{
	if (indexPath.row == 0)
		return 40.0;
	else if(indexPath.row == 1) 
		return 180.0;
	else
		return 260.0;
}


#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Relinquish ownership any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
    // For example: self.myOutlet = nil;
}


- (void)dealloc
{	
	[catePickButton release];
	[photoPickButton release];
	[datePickButton release];
	[geoPickButton release];
	
	[countLabel release];
	[keyboardCloseButton release];
	[cateCloseButton release];
	[dateCloseButton release];
	
	[titleView release];
	[despView release];
	
	[cateArray release];
	
	[appDelegate release];
	[rssParser release];
    [super dealloc];
}


@end