我在我的应用程序中放置了一个推特提要，无论我尝试做什么来让推文完整显示，我都没有完全成功。大多数推文都显示得很好，但真正让我头疼的是那些很长的推文。我认为这是因为我的 textLabel 中没有足够的行，但我注意到如果用户通过多次按 Enter 拉长了他们的推文，推文会显示得很好。这让我相信它会在一定数量的字符后被截断。我不知道我做错了什么，或者这只是 Twitter 的问题。如果有人可以在我的代码中看到任何错误，或者可以更改以解决此问题，请告诉我。谢谢
#import "TwitterFeedTVC.h"
#import "TweetVC.h"
#import <QuartzCore/QuartzCore.h>
#import "GTMNSString+HTML.h"
#define REFRESH_HEADER_HEIGHT 52.0f
#define FONT_SIZE 14.0f
#define CELL_CONTENT_WIDTH 320.0f
#define CELL_CONTENT_MARGIN 10.0f
@implementation TwitterFeedTVC
@synthesize textPull, textRelease, textLoading, refreshHeaderView, refreshLabel, refreshArrow, refreshSpinner, twitterFeedName, twitterFeedTitle;
- (id)initWithStyle:(UITableViewStyle)style {
self = [super initWithStyle:style];
if (self != nil)
{
[self setupStrings];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self != nil)
{
[self setupStrings];
}
return self;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self != nil)
{
[self setupStrings];
}
return self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
self.twitterFeedTitle.text = self.twitterFeedName;
self.navigationItem.title = self.twitterFeedName;
[self fetchTweets];
[self addPullToRefreshHeader];
}
- (void)fetchTweets
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://api.twitter.com/1/statuses/user_timeline.json?include_rts=true&screen_name=johnnelm9r&count=100"]];
if (data == nil)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning"
message:@"Twitter Is Not Responding. Please Try Again Later!"
delegate:self
cancelButtonTitle:@"Kali Baby"
otherButtonTitles: nil];
[alert show];
}
else
{
NSError *error;
tweets = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
}
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
});
}
- (void)viewDidUnload
{
[super viewDidUnload];
textPull = nil;
textRelease = nil;
textLoading = nil;
refreshHeaderView = nil;
refreshLabel = nil;
refreshArrow = nil;
refreshSpinner = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotate
{
return YES;
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return tweets.count;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
NSString *text = [tweet objectForKey:@"text"];
CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), CGFLOAT_MAX);
CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:NSLineBreakByWordWrapping];
CGFloat height = MAX(size.height, 44.0f);
return height + ((CELL_CONTENT_MARGIN * 2) + 9);
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"TweetCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
[dateFormatter setDateFormat:@"EEE MMM dd HH:mm:ss +0000 yyyy"];
NSDate *currentDate = [dateFormatter dateFromString:[tweet objectForKey:@"created_at"]];
NSDate *todayDate = [NSDate date];
NSString *date = [dateFormatter stringFromDate:currentDate];
double timeInterval = [currentDate timeIntervalSinceDate:todayDate];
timeInterval = timeInterval * -1;
if (timeInterval < 1)
{
date = @"never";
}
else if (timeInterval <60)
{
date = @"less than a minute ago";
}
else if (timeInterval <3600)
{
int diff = round(timeInterval / 60);
date = [NSString stringWithFormat:@"%d minutes ago", diff];
}
else if (timeInterval < 86400)
{
int diff = round(timeInterval / 60 / 60);
date = [NSString stringWithFormat:@"%d hours ago", diff];
}
else if (timeInterval < 2629743)
{
int diff = round(timeInterval / 60 / 60 / 24);
date = [NSString stringWithFormat:@"%d days ago", diff];
}
else
{
date = @"never";
}
cell.textLabel.text = [[tweet objectForKey:@"text"] gtm_stringByUnescapingFromHTML];
cell.detailTextLabel.text = [NSString stringWithFormat:@"%@", date];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSString *imageUrl = [[tweet objectForKey:@"user"] objectForKey:@"profile_image_url"];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
dispatch_async(dispatch_get_main_queue(), ^{
cell.imageView.image = [UIImage imageWithData:data];
[cell addSubview:cell.imageView];
});
});
return cell;
}
- (void)setupStrings
{
textPull = @"Pull Down To Be Fresh...";
textRelease = @"Release To Be Fresh...";
textLoading = @"Getting Loaded...";
}
- (void)addPullToRefreshHeader
{
refreshHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0 - REFRESH_HEADER_HEIGHT, 320, REFRESH_HEADER_HEIGHT)];
refreshHeaderView.backgroundColor = [UIColor clearColor];
refreshLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, REFRESH_HEADER_HEIGHT)];
refreshLabel.backgroundColor = [UIColor clearColor];
refreshLabel.font = [UIFont boldSystemFontOfSize:12.0];
refreshLabel.textAlignment = UITextAlignmentCenter;
refreshArrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"KrizzOpener.png"]];
refreshArrow.frame = CGRectMake(floorf((REFRESH_HEADER_HEIGHT - 27) / 2),
(floorf(REFRESH_HEADER_HEIGHT - 44) / 2),
27, 44);
refreshSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
refreshSpinner.frame = CGRectMake(floorf(floorf(REFRESH_HEADER_HEIGHT - 20) / 2), floorf((REFRESH_HEADER_HEIGHT - 20) / 2), 20, 20);
refreshSpinner.hidesWhenStopped = YES;
[refreshHeaderView addSubview:refreshLabel];
[refreshHeaderView addSubview:refreshArrow];
[refreshHeaderView addSubview:refreshSpinner];
[self.tableView addSubview:refreshHeaderView];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
if (isLoading) return;
isDragging = YES;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (isLoading) {
if (scrollView.contentOffset.y > 0)
self.tableView.contentInset = UIEdgeInsetsZero;
else if (scrollView.contentOffset.y >= -REFRESH_HEADER_HEIGHT)
self.tableView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
} else if (isDragging && scrollView.contentOffset.y < 0) {
[UIView beginAnimations:nil context:NULL];
if (scrollView.contentOffset.y < -REFRESH_HEADER_HEIGHT) {
refreshLabel.text = self.textRelease;
} else {
refreshLabel.text = self.textPull;
}
[UIView commitAnimations];
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
if (isLoading) return;
isDragging = NO;
if (scrollView.contentOffset.y <= -REFRESH_HEADER_HEIGHT)
{
[self startLoading];
}
}
- (void)startLoading {
isLoading = YES;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
self.tableView.contentInset = UIEdgeInsetsMake(REFRESH_HEADER_HEIGHT, 0, 0, 0);
refreshLabel.text = self.textLoading;
refreshArrow.hidden = YES;
[refreshSpinner startAnimating];
[UIView commitAnimations];
[self refresh];
}
- (void)stopLoading {
isLoading = NO;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDidStopSelector:@selector(stopLoadingComplete:finished:context:)];
self.tableView.contentInset = UIEdgeInsetsZero;
UIEdgeInsets tableContentInset = self.tableView.contentInset;
tableContentInset.top = 0.0;
self.tableView.contentInset = tableContentInset;
[UIView commitAnimations];
}
- (void)stopLoadingComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
refreshLabel.text = self.textPull;
refreshArrow.hidden = NO;
[refreshSpinner stopAnimating];
}
- (void)refresh {
[self fetchTweets];
[self performSelector:@selector(stopLoading) withObject:nil afterDelay:2.7];
}
#pragma mark - Table view delegate
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"tweetVC"])
{
NSInteger row = [[self tableView].indexPathForSelectedRow row];
NSDictionary *tweet = [tweets objectAtIndex:row];
TweetVC *tweetVC = segue.destinationViewController;
tweetVC.detailItem = tweet;
}
}