我遇到了一个非常复杂和自定义的库，对于任何想要内置消息传递系统的应用程序非常有用。JSQMessagesViewController on Github。当我试图自己实现库时，我遇到了一些问题。一个我不太了解＆＃34;协议的术语＆＃34;和＃34;班级＆＃34; （我对课程有点了解）。第一个问题是我无法在CollectionView中使用PFObject，因为需要通过大多数自定义方法传递JSQMessage的实例。现在，我知道如何接受PFObject，从中获取属性
self.eachMessage = [self.messages objectAtIndex:indexPath.row]; //each message
self.eachMessage[@"message"] //message from the PFObject
self.eachMessage[@"sender"] //sender from the PFObject
JSQMessage类具有自定义属性，可以表示PFObject的属性，如
JSQMessage *message = [[JSQMessage alloc] init]; //initialize it
message.senderId //could be the objectId of the user
message.senderDisplayName //the user's username
message.text //text of the message
message.date //time sent of the message
问题是，在自定义类JSQMessage中......所有这些属性都是只读的。我相信我可以进去改变它，所以我可以将它们分配给我想要的东西但是我必须在这里找到一些东西。我将附加我的.h和.m文件中的所有内容。 当我发送消息时，唯一出现的是文本，我相信这是因为它来自inputToolbar上的textView。
.h文件
#import <UIKit/UIKit.h>
#import <JSQMessagesViewController/JSQMessages.h>
#import <Parse/Parse.h>
#import <JSQMessagesViewController/JSQMessagesBubbleImageFactory.h>
@interface ConvoViewController : JSQMessagesViewController
@property (strong, nonatomic) NSMutableArray *messages;
@property (strong, nonatomic) PFUser *sender;
@property (strong, nonatomic) PFUser *receiver;
@property (strong, nonatomic) JSQMessage *eachMessage;
@property (strong, nonatomic) PFObject *aMessage;
@property (strong, nonatomic) JSQMessagesBubbleImageFactory *bubbleImage;
@end
.m文件
- (void)viewDidLoad {
[super viewDidLoad];
//Color of the keyboard (Dark to match everything else)
self.inputToolbar.contentView.textView.keyboardAppearance = UIKeyboardAppearanceDark;
//Color the inputview background
self.inputToolbar.backgroundColor = [UIColor colorWithWhite:0 alpha:0.9];
//Delete the avatars appearing next to the messages
self.collectionView.collectionViewLayout.incomingAvatarViewSize = CGSizeZero;
self.collectionView.collectionViewLayout.outgoingAvatarViewSize = CGSizeZero;
//Set the senderID
self.senderId = self.sender.objectId;
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:YES];
//Query for part of the messages
PFQuery *messages1 = [PFQuery queryWithClassName:@"Messages"];
[messages1 whereKey:@"sender" equalTo:self.sender];
[messages1 whereKey:@"receiver" equalTo:self.receiver];
//Query for other part of messages
PFQuery *messages2 = [PFQuery queryWithClassName:@"Messages"];
[messages2 whereKey:@"sender" equalTo:self.receiver];
[messages2 whereKey:@"receiver" equalTo:self.sender];
//Combine those queries
PFQuery *allMessages = [PFQuery orQueryWithSubqueries:@[messages1, messages2]];
[allMessages findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
self.messages = [objects mutableCopy];
[self.collectionView reloadData];
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Send Button
- (void)didPressSendButton:(UIButton *)button withMessageText:(NSString *)text senderId:(NSString *)senderId senderDisplayName:(NSString *)senderDisplayName date:(NSDate *)date {
[JSQSystemSoundPlayer jsq_playMessageSentSound];
JSQMessage *message = [[JSQMessage alloc] initWithSenderId:self.sender.objectId
senderDisplayName:self.sender.username
date:[NSDate date]
text:text];
[self.messages addObject:message];
NSLog(@"%@", text);
[self finishSendingMessageAnimated:YES];
}
#pragma mark - JSQMessages Data Source methods
- (id<JSQMessageData>)collectionView:(JSQMessagesCollectionView *)collectionView messageDataForItemAtIndexPath:(NSIndexPath *)indexPath
{
//Return the actual message at each indexpath.row
return [self.messages objectAtIndex:indexPath.row];
}
- (id<JSQMessageBubbleImageDataSource>)collectionView:(JSQMessagesCollectionView *)collectionView messageBubbleImageDataForItemAtIndexPath:(NSIndexPath *)indexPath
{
/**
* You may return nil here if you do not want bubbles.
* In this case, you should set the background color of your collection view cell's textView.
*
* Otherwise, return your previously created bubble image data objects.
*/
JSQMessage *message = [self.messages objectAtIndex:indexPath.item];
if ([message.senderId isEqualToString:self.senderId]) {
return [self.bubbleImage incomingMessagesBubbleImageWithColor:[UIColor orangeColor]];
}
return [self.bubbleImage outgoingMessagesBubbleImageWithColor:[UIColor grayColor]];
}
#pragma mark - Collection View
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
//Number of messages
return self.messages.count;
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
//Number of sections
return 1;
}
- (UICollectionViewCell *)collectionView:(JSQMessagesCollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
//Creating or initial cell for the number of index paths (number of messages)
JSQMessagesCollectionViewCell *cell = (JSQMessagesCollectionViewCell *)[super collectionView:collectionView cellForItemAtIndexPath:indexPath];
//Put our messages dictionaries into PFObject so we can put them into individual cells
self.eachMessage = [self.messages objectAtIndex:indexPath.row];
//Put the message object into the textView's text property
cell.textView.text = self.eachMessage.text;
//Setting the text color of the message bubble based upon the sender
if ([self.eachMessage.senderId isEqualToString:self.senderId]) {
cell.textView.textColor = [UIColor blackColor];
} else {
cell.textView.textColor = [UIColor whiteColor];
}
//Set the top label to the person who sent the message
cell.cellTopLabel.text = [NSString stringWithFormat:@"@%@", self.eachMessage.senderId];
//Format the bottom label to a readable date
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MM/dd/yy h:mm a"];
cell.cellBottomLabel.text = [dateFormatter stringFromDate:self.eachMessage.date];
//If there is a link of some sorts in the message
cell.textView.linkTextAttributes = @{ NSForegroundColorAttributeName : cell.textView.textColor,
NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle | NSUnderlinePatternSolid) };
//What we return into the collectionview
return cell;
}
答案 0 :(得分：0)
这是我的代码的一部分。整个文件都很大，如果我分享那些，我的老板不会高兴。 ： - ）
以下是我在我的DemoMessagesViewController中加载DemoData的方式：
self.demoData = [[DemoModelData alloc] init];
self.demoData.users = @{self.senderId:self.senderDisplayName,
self.targetUserId:self.targetUserName};
UIImage *tempImg = [HTTPServerKaDost fetchImageFromUrlString:userProfile.profilePicUrl]; //replace with your code to load image
JSQMessagesAvatarImage *srcImage = [JSQMessagesAvatarImageFactory
avatarImageWithImage:tempImg
diameter:kJSQMessagesCollectionViewAvatarSizeDefault];
tempImg = [HTTPServerKaDost fetchImageFromUrlString:self.targetUserImageFullUrl];
JSQMessagesAvatarImage *destImage = [JSQMessagesAvatarImageFactory
avatarImageWithImage:tempImg
diameter:kJSQMessagesCollectionViewAvatarSizeDefault];
self.demoData.avatars = @{self.senderId:srcImage,
self.targetUserId:destImage};
[self.demoData loadMessages];
在loadMessages方法内部（由我在DemoModelData类中添加），创建JSQMessage个对象：
JSQMessage *msg = [[JSQMessage alloc] initWithSenderId:[msgDict valueForKey:@"sender"]
senderDisplayName:[msgDict valueForKey:@"fname"]
date:dateT
text:[msgDict valueForKey:@"data"]];
[self.messages addObject:msg];
并且只要您想要刷新聊天视图，请在DemoMessagesViewController：
[self finishReceivingMessageAnimated:YES];
[self scrollToBottomAnimated:YES];