［XMPP］iOS聊天软件学习笔记［四］
昨天完成了聊天界面，基本功能算告一段落
开发时间：五天（工作时间）
开发工具：xcode6
开发平台：iOS8
XMPP框架：XMPPFramework
git clone https://github.com/robbiehanson/XMPPFramework.git
界面设计：使用StoryBoard
github地址：https://github.com/hjandyz/XMPP
1.关于socket在后台的运行，iOS8可以直接使用(但是我自由在模拟器成功，真机不知为何不可以)，ios7的话需要配置
其实很方便，初始化xmppstream以后
_XMPPStream.enableBackgroundingOnSocket = YES;
然后修改plist文件
2.获得后台运行的权限以后我们就可以接收到message了
#pragma mark 接收到好友消息
- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
//判断是否在前台
if([UIApplication sharedApplication].applicationState != UIApplicationStateActive){
HJLog(@"后台");
UILocalNotification *localNoti = [[UILocalNotification alloc] init];
localNoti.alertBody = [NSString stringWithFormat:@"%@:%@",message.fromStr,message.body];
localNoti.soundName = @"default";
[[UIApplication sharedApplication] scheduleLocalNotification:localNoti];
}
}
当然iOS8要注册一下通知，用户允许才能发通知给用户
//注册应用接受通知
if([[UIDevice currentDevice].systemVersion doubleValue] > 8.0){
UIUserNotificationSettings *setting = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil];
[application registerUserNotificationSettings:setting];
}
3.发消息的时可以自己在xml文件中加入body，这样子可以区分图片声音还是文字或者其他格式
- (void)shendMessage:(NSString *)text bodyType:(NSString *)bodyType
{
XMPPMessage *message = [XMPPMessage messageWithType:@"chat" to:self.friendJid];
[message addAttributeWithName:@"chatType" stringValue:bodyType];
[message addBody:text];
[[HJXMPPTool sharedHJXMPPTool].XMPPStream sendElement:message];
}
4.一些小方法，为了显示新的消息自动混动到底部，用户拖动scrollView时候隐藏键盘
#pragma mark - 滚动到底部
- (void)scrollToTableViewBotton
{
NSInteger lastRow = _resultController.fetchedObjects.count - 1;
if (lastRow < 0) {
return;
}
NSIndexPath *path = [NSIndexPath indexPathForRow:lastRow inSection:0];
[self.tableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[self.view endEditing:YES];
}
3.通过的到contentSize来让输入框最多变高成三行
#pragma mark - textView delegate
- (void)textViewDidChange:(UITextView *)textView
{
CGFloat contentH = textView.contentSize.height;
// NSLog(@"%f",size.height);
if (contentH > 33 && contentH < 67) {
self.inputViewHeightConstraint.constant = contentH + 18;
}
NSString *text = textView.text;
if([text rangeOfString:@"\n"].length != 0){
//去除换行字符
text = [text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[self shendMessage:text bodyType:@"text"];
textView.text = nil;
self.inputViewHeightConstraint.constant = 50;
}
}
4.用代码实现自动布局(VLF)也是很有用的
#warning 代码实现自动布局，要设置下面为NO
tableView.translatesAutoresizingMaskIntoConstraints = NO;
//自动布局 VFL
NSDictionary *views = @{@"tableView":tableView, @"inputView":inputView};
NSArray *tableHConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[tableView]-0-|" options:0 metrics:nil views:views];
[self.view addConstraints:tableHConstraints];
NSArray *inputHConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[inputView]-0-|" options:0 metrics:nil views:views];
[self.view addConstraints:inputHConstraints];
NSArray *vConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[tableView]-0-[inputView(50)]-0-|" options:0 metrics:nil views:views];
[self.view addConstraints:vConstraints];
