我在使用GameKit框架时遇到了问题。在我的应用程序中，我要发送文本或图像。现在，当我从UIImagePicker发送图像时，它能正常工作。但是当我发送文本时，它不会显示与图片相同的UIAlertView，也没有图片。这是.h文件：
#import <UIKit/UIKit.h>
#import <GameKit/GameKit.h>
@interface ViewController : UIViewController <GKPeerPickerControllerDelegate, GKSessionDelegate, UIActionSheetDelegate, UINavigationControllerDelegate, UIImagePickerControllerDelegate> {
GKSession *currentSession;
IBOutlet UITextField *txtMessage;
IBOutlet UIButton *connect;
IBOutlet UIButton *disconnect;
GKPeerPickerController *picker;
UIImagePickerController *imgPicker;
BOOL isText;
UIImage *_image;
}
@property (nonatomic, retain) GKSession *currentSession;
@property (nonatomic, retain) UITextField *txtMessage;
@property (nonatomic, retain) UIButton *connect;
@property (nonatomic, retain) UIButton *disconnect;
-(IBAction) btnSend:(id) sender;
-(IBAction) btnConnect:(id) sender;
-(IBAction) btnDisconnect:(id) sender;
-(IBAction)chooseImageData:(id)sender;
@end
然后是 .m 文件：
#import "ViewController.h"
#import <GameKit/GameKit.h>
@implementation ViewController
@synthesize currentSession;
@synthesize txtMessage;
@synthesize connect;
@synthesize disconnect;
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad {
[connect setHidden:NO];
[disconnect setHidden:YES];
[super viewDidLoad];
}
- (void)peerPickerController:(GKPeerPickerController *)picker
didConnectPeer:(NSString *)peerID
toSession:(GKSession *) session {
self.currentSession = session;
session.delegate = self;
[session setDataReceiveHandler:self withContext:nil];
picker.delegate = nil;
[picker dismiss];
}
-(IBAction) btnConnect:(id) sender {
picker = [[GKPeerPickerController alloc] init];
picker.delegate = self;
picker.connectionTypesMask = GKPeerPickerConnectionTypeNearby;
[connect setHidden:YES];
[disconnect setHidden:NO];
[picker show];
}
- (void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker
{
picker.delegate = nil;
[connect setHidden:NO];
[disconnect setHidden:YES];
}
-(IBAction) btnDisconnect:(id) sender {
[self.currentSession disconnectFromAllPeers];
currentSession = nil;
[connect setHidden:NO];
[disconnect setHidden:YES];
}
- (void)session:(GKSession *)session
peer:(NSString *)peerID
didChangeState:(GKPeerConnectionState)state {
switch (state)
{
case GKPeerStateConnected:
NSLog(@"connected");
break;
case GKPeerStateDisconnected:
NSLog(@"disconnected");
currentSession = nil;
[connect setHidden:NO];
[disconnect setHidden:YES];
break;
}
}
- (void) mySendDataToPeers:(NSData *) data
{
if (currentSession)
[self.currentSession sendDataToAllPeers:data
withDataMode:GKSendDataReliable
error:nil];
}
- (void) mySendImageToPeers:(NSData *) data
{
if (currentSession)
[self.currentSession sendDataToAllPeers:data
withDataMode:GKSendDataReliable
error:nil];
}
-(IBAction) btnSend:(id) sender
{
//---convert an NSString object to NSData---
NSData* data;
NSString *str = [NSString stringWithString:txtMessage.text];
data = [str dataUsingEncoding: NSASCIIStringEncoding];
[self mySendDataToPeers:data];
}
- (void) receiveData:(NSData *)data
fromPeer:(NSString *)peer
inSession:(GKSession *)session
context:(void *)context {
//---convert the NSData to NSString---
if (isText) {
isText = YES;
NSString* str;
str = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Messaggio"
message:str
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
}
else
{
UIImage *tempSentImg = [UIImage imageWithData:data];
_image = tempSentImg;
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Immagine"
message:@"\n\n\n\n\n"
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
UIImageView *imageView = [[UIImageView alloc] initWithImage:_image];
CGFloat imageHeight = 100;
CGFloat imageWidth = imageHeight * _image.size.width / _image.size.height;
imageView.frame = CGRectMake(floor((284 - imageWidth)/2), 47, imageWidth, imageHeight);
[alert addSubview:imageView];
[alert show];
return;
}
}
-(IBAction)chooseImageData:(id)sender {
[self performSelector: @selector(dialogOtherAction)];
}
- (void)dialogOtherAction {
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil
delegate:self
cancelButtonTitle:NSLocalizedString(@"Annulla", @"")
destructiveButtonTitle:nil
otherButtonTitles:NSLocalizedString(@"Scegli dalla libreria", @""),
NSLocalizedString(@"Scatta una foto", @""),nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
[actionSheet showInView:self.view];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
imgPicker = [[UIImagePickerController alloc] init];
imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imgPicker.allowsEditing = NO;
imgPicker.delegate = self;
[self presentModalViewController:imgPicker animated:YES];
}
else if (buttonIndex == 1)
{
imgPicker = [[UIImagePickerController alloc] init];
imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imgPicker.delegate = self;
imgPicker.allowsEditing = NO;
[self presentModalViewController:imgPicker animated:YES];
}
}
-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
[actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}
- (void)imagePickerController:(UIImagePickerController *)imgPicker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self dismissModalViewControllerAnimated:YES];
UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
[self performSelector: @selector(btnImageSend:) withObject: image afterDelay: 1.0];
}
-(IBAction) btnImageSend:(UIImage *)image
{
//---convert an NSString object to NSData---
NSData* data;
data = UIImagePNGRepresentation(image);
[self mySendImageToPeers:data];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = 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)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end