Iphone 是否从单台更新表?
我正在编写一个聊天应用程序,它有几个不同的ViewController 我实现了一个Singleton来监听来自服务器的新消息。当我收到一条新消息时,我想在另一个viewController选项卡FirstViewController中更新正确的TableView。该viewController中的表称为visitorsTableView 以下是我当前的单例实现:Iphone 是否从单台更新表?,iphone,ios,objective-c,Iphone,Ios,Objective C,我正在编写一个聊天应用程序,它有几个不同的ViewController 我实现了一个Singleton来监听来自服务器的新消息。当我收到一条新消息时,我想在另一个viewController选项卡FirstViewController中更新正确的TableView。该viewController中的表称为visitorsTableView 以下是我当前的单例实现: #import "ChatDataController.h" #import "TabFirstViewController.h"
#import "ChatDataController.h"
#import "TabFirstViewController.h"
@implementation ChatDataController
{
ChatDataController * anotherSingles;
}
@synthesize enString;
@synthesize enInt;
@synthesize messages;
+ (ChatDataController *)sharedInstance
{
static dispatch_once_t once;
static ChatDataController *chatDataController;
dispatch_once(&once, ^ { chatDataController = [[ChatDataController alloc] init];});
return chatDataController;
}
- (id)init
{
self = [super init];
if (self) {
messages = [[NSMutableArray alloc] init];
}
return self;
}
// Open connection to server
- (void)initNetworkCommunication {
isConnected = TRUE;
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"localhost", 8080, &readStream, &writeStream);
inputStream = (__bridge NSInputStream *)readStream;
outputStream = (__bridge NSOutputStream *)writeStream;
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
}
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSLog(@"stream event %i", streamEvent);
switch (streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(@"Stream opened");
break;
case NSStreamEventHasBytesAvailable:
if (theStream == inputStream) {
uint8_t buffer[1024];
int len;
while ([inputStream hasBytesAvailable]) {
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if (len > 0) {
NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
if (nil != output) {
NSLog(@"server said: %@", output);
[self messageReceived:output];
}
}
}
}
break;
case NSStreamEventErrorOccurred:
NSLog(@"Can not connect to the host!");
isConnected = 0;
break;
case NSStreamEventEndEncountered:
[theStream close];
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
//[theStream release];
theStream = nil;
break;
default:
NSLog(@"Unknown event");
}
}
// I want to update the table from this method...
- (void) messageReceived:(NSString *)message {
[self.messages addObject:message];
/**
* Trying to update the table..
*/
TabFirstViewController *controller = [[TabFirstViewController alloc] init];
NSString *s = (NSString *) [NSIndexPath indexPathForRow:messages.count-1 inSection:0];
NSIndexPath *topIndexPath = [NSIndexPath indexPathForRow:messages.count-1
inSection:0];
[controller.visitorsTableView scrollToRowAtIndexPath:topIndexPath
atScrollPosition:UITableViewScrollPositionMiddle
animated:YES];
[controller.visitorsTableView reloadData];
}
@end
我应该如何更新visitorsTableView表?当我从服务器收到新消息时,我希望保持更新
应该说,我有更多的ViewController,每个都包含一个tableView,因此我希望能够同时更新它们。您不能在每次收到消息时初始化Table view。 有两种方式,, 1.使用委托模式, 当您需要将调用委托给单个处理程序时,首选此选项 2.使用本地通知
当您有多个处理程序处理同一通知时,首选。我将向您的聊天应用程序推荐此功能我建议您在收到新消息时使用通知来获得通知。通知回调可用于重新加载表视图